# Questions Asked onFebruary 3, 2011

1. ## Physics

What is the average power output of a weightlifter who can lift 260 kg to a height of 1.9 m in 1.8 seconds?

2. ## Physics

1) Charges of +4uC and -6uC are placed at two corners of an equilateral triangle with sides of 0.10m. At the third corner, what is the electric field magnitude created by these two charges? A]4.5 x 10e6 N/C B]3.1 x 10e6 N/C C]1.6 x 10e6 D]4.8 x 10e6 2)A

3. ## Physics

A +3.0 nC charge is at x=0 cm and a -1.0 nC charge is at x=4 cm. At what point or points on the x-axis is the electric potential zero?

4. ## physics

A worker stands still on a roof sloped at an angle of 23° above the horizontal. He is prevented from slipping by a static frictional force of 540 N. Find the mass of the worker.

5. ## physics

The engines of a 1.20 x 10^5 N rocket exert an upward thrust of 2.00 x 10^5 N for 1.50 minutes upon lift off. What is the impulse exerted on the rocket? What is the velocity of the rocket at the end of the 1.50 minute period? physics - bobpursley,

6. ## math

Prove that if x and y are nonnegative real numbers, then (x+y)/2 ≥ sqrt(xy). Use the technique of working backward from the desired conclusion. Where in the proof do we use the fact that x and y are nonnegative?

7. ## algrebra 1

A 180 ft long board is cut into 3 pieces. The second piece of board is twice as long as the first. The third piece of board is six times as long as the first. What is the length of the first piece of the board A) 20 ft B) 40 ft C) 60 ft D) 120 ft

8. ## math

two girls caught 25 frogs. Lisa caught four times as many as Jen did. how many frogs did Jen catch

9. ## Pre-Calculus

74. Road Grade When driving down a mountain road, you notice warning signs indicating that it is a "12% grade." This means that the slope of the road is -12/100. Approximate the amount of horizontal change in your position if you note from elevation

10. ## physics

A 60 g golf ball leaves the face of a golf club with a velocity of 75 m/s. If the club exerted an average force of 3.0 x 10^4 N, what was the time of impact between the club and the ball?

11. ## physics

a 900 N running back moving at 2.0 m/s is stoppped in 0.70 seconds when hit by a lineback. What average foarce did the linebacker exert on the running back? How much did the running back's momentum change?

12. ## Algebra- is my answer right

Choose the end behavior of the graph of each polynomial function. A f(x)= -5x^3-4x^2+8x+5 B f(x)= -4x^6+6x^4-6x^3-2x^2 C f(x)= 2x(x-1)^2(x+3) A= falls to the left and rises to the right B= Falls to the left and right C=Rises to the right and left.

13. ## Algebra

Find the domain of the function. f(x)=(sqrt x+6)/(-2x-5) Write your answer as an interval or union of intervals.

14. ## science

The engines of a 1.20 x 10^5 N rocket exert an upward thrust of 2.00 x 10^5 N for 1.50 minutes upon lift off. What is the impulse exerted on the rocket? What is the velocity of the rocket at the end of the 1.50 minute period?

15. ## chemistry

If boron hydride, B4H10, is treated with pure oxygen, it burns to give B2O3 and H2O. 2 B4H10(s) + 11 O2(g)  4 B2O3(s) + 10 H2O(g) If a 0.050-g sample of the boron hydride burns completely in O2, what will be the pressure of the gaseous water in a 4.25-L

16. ## Chemistry

The heat capacity of liquid water is 4.18 J/g•C and the heat of vaporization is 40.7 kJ/mol. How many kilojoules of heat must be provided to convert 1.00 g of liquid water at 67C into 1.00 g of steam at 100C? A. 22.7 kJ B. 40.8 kJ C. 2.2 kJ D.

17. ## algrebra 1

The area of a rectangle is 128 in². If the length is twice the width, what is the length of the rectangle? A) 64 in. B) 16 in. C) 8 in. D) 4 in. The length of a swimming pool is 22 ft. The width is 40 ft. If the volume of the pool is 2,500 ft³, which

18. ## Physics

Twelve identical point charges are equally spaced around the circumference of a circle of radius 'R'. The circle is centered at the origin. One of the twelve charges, which happens to be on the positive axis, is now moved to the center of the circle. Part

19. ## Physics

A bullet with a mass of mb= 0.05 kg is speeding toward a block of mass m= 10kg. The bullet is moving at vb= 200m/s and the block is at rest. the bullet collides with he block and knocks the block over the edge. the edge is a height h= 0.5m above ground.

20. ## statistics

. License plates are made using 2 letters followed by 3 digits. How many different plates can be made if repetition of letters and digits is allowed?

21. ## Physics

A bicyclist is coasting straight down a hill at a constant speed. The mass of the rider and bicycle is 85.0 kg, and the hill is inclined at 19.0° with respect to the horizontal. Air resistance opposes the motion of the cyclist. Later, the bicyclist climbs

22. ## Chemistry

A steel cylinder contains 98.0 moles of oxygen gas at temperature of 38 degree Celsius and a pressure of 740 torr. After some of the oxygen gas has been used, the pressure is reduced to 332 torr at a temperature of 24 degree Celsius. What mass of oxygen

23. ## Chemistry

CaO(s) reacts with SO2(g) according to the following equations: CaO9(s)+So2(g)--> CaSO3(g). A 8.85g mixture containing CaO(s) is placed in a 3.00-L container. The container is filled with SO2(g) to a pressure of 749 torr, at 20.0 degree Celsius. After the

How is the main idea of the "The Voice from the Wall " written by Amy Tan

25. ## chemistry

Calculate the mass in grams for a gold sample that absorbs 225 to change its temperature from 16.0 to 36.0.

26. ## geometry

In the figure shown, NK and ML are parallel, JN=10 feet, NK=14 feet, JL=22 feet, and ML=24. Find KL.

27. ## science

6. identify the action-reaction pairs of forces for the following situations: (a) you step off a curb. (b) you pat your tutor on the back (c) a wave hits a rocky shore.

28. ## chem

is SiS2 polar or nonpolar? Why? I think its non but when I searched it people were saying polar thanks:)

29. ## Physics

A car travels at a speed of 25 m/s on a flat stretch of road. The driver must maitain pressure on the accelerator to keep the car moving at a constant speed. Are there any forces doing work on the car? Explain. What is the net force?

30. ## Physics

A 37 kg child roller skates, initially at rest, rolls 2.0 m down an incline at an angle of 17 degrees with the horizontal. If there's no friction, what is the kinetic energy of the child at the bottom of the incline?

31. ## Physics

Friction provides the force needed for a car to travel around a flat, circular race track. What is the maximum speed at which a car can safely travel if the radius of the track is 80.0 m and the coefficient of friction is 0.38?

32. ## Physics

A skier is pulled up a slope at a constant velocity by a tow bar. The slope is inclined at 24.0° with respect to the horizontal. The force applied to the skier by the tow bar is parallel to the slope. The skier's mass is 60.0 kg, and the coefficient of

33. ## physics

One strategy in a snowball fight is to throw a snowball at a high angle over level ground. While your opponent is watching this first snowball, you throw a second snowball at a low angle and time it to arrive at the same time as the first. The acceleration

34. ## Chemistry

A sample of oxygen gas is collected by displacing water from an inverted bottle as shown in the diagram below. The volume of O2(g) collected is 400.0ml at 25 degree Celsius. The atmospheric pressure is 680 torr and the vapor pressure of water at 25 degree

35. ## Physics

A 37 kg child roller skates, initially at rest, rolls 2.0 m down an incline at an angle of 17 degrees with the horizontal. If there's no friction, what is the kinetic energy of the child at the bottom of the incline?

36. ## Algebra-I'm still stuck

The one-to-one function f is defined by f(x)=(4x-1)/(x+7). Find f^-1, the inverse of f. Then, give the domain and range of f^-1 using interval notation. f^-1(x)= Domain (f^-1)= Range (f^-1)= Any help is greatly appreciated. Algebra - helper, Wednesday,

37. ## calculus

Consider the function below. f(x) = 4x2 - 5x (a) Find f '(2). (b) Use the answer in part (a) to find an equation of the tangent line to the parabola y = 4x2 - 5x at the point (2, 6). y =

38. ## physics

The electrons in a TV tube are accelerated from rest through a potential difference of 18kV. Esimate the speed of the electrons after they have been accelerated by this potential difference.

39. ## physcis

In the diagram shown the pulley at frictionless and the cylindrical load weighs 800. A. Determine the tension in the cable. B. Determine the horizontal component of the reaction of the pin A. C. Determine the vertical component of the reaction of the pin

40. ## AP Statistics - Sampling Distribution Help

The composite scores of students on the ACT college entrance examination in a recent year had a Normal distribution with mean µ = 20.4 and standard deviation = 5.8. 1) What is the probability that a randomly chosen student scored 24 or higher on the ACT?

41. ## Chemistry

If mixing baking soda, (NaHCO3) with vinegar (CH3COOH) to generate carbonic acid (H2CO3), which breaks up into water and carbon dioxide gas) and sodium acetate (NaCH3COO), would the equation be: NaHCO3 + CH3COOH yields H2CO3 + NaCH3COO

42. ## Math

Could someone please help me solve this problem, the age numbers that I am working with are 10yrs old 55yrs old and 75yrs. old. I need to know at my age of 55, in years, how old was the older person of 75 when I was born? Could you please write an equation

43. ## Science

Are there more particles of acid in a drop of 1% hydrochloric acid (HCl) or more particles of base in a drop of 1% potassium hydroxide (KOH)? Explain how you figured out your answer. 4. Draw a diagram to show

44. ## chemistry

What is the density of sulfur dioxide gas at 25 degrees celsius and 754 mm Hg?

45. ## chemistry II

If a 2.15-g sample of gas occupies 750. mL at STP, what is the molar mass of the gas at 125 degrees celcuis

46. ## Physics

while on the moon, the Apollo astronauts enjoyed the effect of a gravity much smaller than that on earth. if Neil Armstrong jumped up on the moon with an initial speed of 1.51 m/s to a height of 0.700m, what amount of gravitational acceleration did he

47. ## physics

A 109 kg fullback runs at the line of scrimmage. (a) Find the constant force that must be exerted on him to bring him to rest in a distance of 1.1 m in a time interval of 0.22 s. (b) How fast was he running initially?

48. ## physics

A 109 kg fullback runs at the line of scrimmage. (a) Find the constant force that must be exerted on him to bring him to rest in a distance of 1.1 m in a time interval of 0.22 s. (b) How fast was he running initially? someone answered this earlier but i do

49. ## physics

A boy weighing 4.2 102 N jumps from a height of 1.80 m to the ground below. Assume that the force of the ground on his feet is constant. (a) Compute the force of the ground on his feet if he jumps stiff-legged, the ground compresses 2.20 cm, and the

50. ## Nuclear Physics

An investigator receives Co-60 (5.27 year half life) for use in a research study. Unfortunately the Co-60 is contaminated with Cs-137 (30.0 year half life). The initial Co-60 activity is 400 times the initial Cs-137 activity. How long after the initial

51. ## Nuclear Physics

A meteorite has landed at UOIT! Chemical analysis shows that it contains 1 gram of potassium and 1E-5 grams of argon, assumed to be present entirely from the decay of K-40. Assuming that no argon has escaped the meteorite, estimate the age of the

52. ## chemistry

An isotonic solution contains 0.86% by mass per volume. Calculate the percent mass per volume for an isotonic solution of KCl at 30 degrees C. Assume a van't Hoff factor of 1.9.

53. ## chemistry

What volume of 16M HNO3 is required to dissolve 0.50g of Cu metal in the following reaction? Cu(s) + 4HNO3(aq) ---> Cu(NO3)2 + 2H2O + 2NO2

54. ## Physics

A car travels at a speed of 25 m/s on a flat stretch of road. The driver must maitain pressure on the accelerator to keep the car moving at a constant speed. Are there any forces doing work on the car? Explain. What is the net force?

55. ## physics

While blowing its horn of frequency 477 Hz, a car accelerates at 0.94 m/s2. The car starts from rest by your side and moves away. How many seconds does it take for the frequency you hear to decrease by 5%? Hint: Do not forget to include the time it will

56. ## Math

Karen can be paid in one of two ways for selling insurance policies: Plan A:A salary of \$750 per month, plus a commission of 10% of sales. Plan B:A salary of \$1000 per month, plus a commission of 8% of sales in excess of \$2000. For what amount of monthly

57. ## Physics

A)a 72 kg man jumps from a window 1.2 m above a sidewalk. the acceleration of gravity is 9.81 m/s2. what is his speed just before his feet strike the pavement? answer in units of m/s B) if the man jumps with his knees and ankles locked, the only cushion

58. ## college chemistry

A 1.875 g sample of pyrazine was dissolved in 25.00g of water, producing a solution that freezes at -1.55 C. Assume the solution behaves ideally. Kf(H2O)=1.86 C/molality. What is the experimental molecular weight of pyrazine?

59. ## Social Studies

How did judaism change under babylonian and persian rule?

60. ## math

The area of a parallelogram is 100 square millimeters. The base is 4 milimeters. Find the height.

61. ## geomerty

identify the property x=x

62. ## physics

on a force-time graph: rectangle is shaded in from 2 to 8 on the x axis. It is shaded from 0 to 8 on the y axis. (so the base is 2 to 8 and the height is 0 to 8) The graph is for a force acting on a 12.0 kg cart initially at rest on a frictionless surface.

63. ## stats

Particles are a major component of air pollution in many areas. It is of interest to study the sizes of contaminating particles. Let X represent the diameter, in micrometers, of a randomly chosen particle. Assume that in a certain area, the probability

64. ## geometry

identify the properties 1.) if a=b and c=d then ac=bd 2.) c(d+e) = cd+ce 3.) if c=d and d=e ten c=e 4.) if x=y and p=q then x+p=y+q 5.) if t=r then r=t

65. ## math

Suppose your dog runs at constant speed of 10m/s for 50 seconds.How far did your dog run?

66. ## SCIENCE

mr. and mrs. diego speak spanish and english. THEY BOTH HAVE LONG EYELASHES AND BROWN EYES. MRS DIEGO IS RIGHT-HANDED AND PLAYS BASKETBALL. MR. DIEGO IS LEFT-HANDED AND PLAYS PIANO. UNDER WHAT CIRCUMSTANCES COULD THEY HAVE A BLUE-EYED, LEFT-HANDED CHILD?

67. ## geometry

given xz=72, xy=5x+3 and yz=8x-9. is Y the midpoint of ling xz? explain answer.

68. ## geometry

given D is the midpoint of line CE E is the midpoint of line df. prove line cd is congruent to line ef give me reasons

69. ## SraJMcGin

SraJMcGin. I have a few questions; a few things that I don't really get.. I have trouble remembering the endings of the er, ir, and re verbs. Regular verbs mean that they don't have to be changed(they stay in the same form), its just their endings that

70. ## Science Physics

A rubber ball of mass m1= 10kg is moving to the right with speed v1= 10m/s. it collides elastically with another ball of mass m2= 50kg, which is sitting at rest. m2 is larger than m1, what are the speeds of the balls, v1 and v2 after the collision?

71. ## Physics

An object of mass m= 4.8g and charge Q = 49uC is attached to a string and placed in a uniform electric field that is inclined at an angle of 30.0 with the horizontal (see the figure). The object is in static equilibrium when the string is horizontal. a)

72. ## Physics

two cars, one with mass m1=1000kg and the other with mass m2= 4000kg crash in an intersection. Before the crash, car m1 was headed east with a speed of v1i= 25 m/s and the car m2 was headed north with a speed of v2i= 10m/s. After the crash, the cars stick

73. ## Physics

Does anyone know how to find the electric force of two objects if I have the distance and mass of the one of the objects? Thanks.

A 31.0 kg crate, initially at rest, slides down a ramp 2.6 m long and inlined 14 degrees with the horizontal. Using the work-kinetic energy theorem and disregarding friction, find the velocity of th crate at the bottom of the ramp

75. ## Chemistry

What is the equation for heat of CuCO3 and heat of Pb(NO3)2.

77. ## English

Can you please check if these sentences are possible, please? Thank you. 1)You can book your train journey online or through a travel agency. First you make sure your passport is not out of the date. 3) Check the train time (time table?) and the fare.

78. ## GEOMETRY

Can you construct a triangle of side lengths of 7 inches, 8 inches, and 15 inches?

79. ## Energy and momentum Physics

two cars, one with mass m1=1000kg and the other with mass m2= 4000kg crash in an intersection. Before the crash, car m1 was headed east with a speed of v1i= 25 m/s and the car m2 was headed north with a speed of v2i= 10m/s. After the crash, the cars stick

80. ## Chemistry

How many moles of nitric acid will be produced when 0.35 moles of water reacts?

81. ## chemistry

what type of interaction is Mg2+, O2- What type of interaction is Na+, Cl- What type of interaction is I-I What type of interaction is H2CO, and CO What type of interaction is SO2, C6 H14

82. ## nuclear physics

A researcher wishes to extract 140 La from 140 Ba. She obtains a 1000 MBq virgin Ba-140 sample and must wait until the maximum activity of La-140 is available. a) Write down the decay relationship (include half-lives), and include the final stable product.

83. ## arithmetic

How do I solve these questions? 3 1/3 - 2 2/5= 2.75 + .003 + .158 = 7/20 is equal to ? What is the value of the expression 2x2+ 3xy – 4y2 when x = 2 and y = - 4? 16x - 8 = If 2x – 3(x + 4) = - 5, then x = – 3(5 – 6) – 4(2 – 3) =

How do i write my cat leaped onto my stomach in the middle of the night correctly?

85. ## Algebra 2

A Rectangular Field is to be enclosed by a fence and divided into three parts by another fencer. Find the maximum area that can be enclosed and separated in this way with 500 meters of fencing.

86. ## intro to chemistry

how to come come up with a significant digits poam

87. ## chemistry

How do I determine which of the following aqueous solutions should demonstrate the most ideal behavior? 1.0M MgSO4 or 1.0M NaCl?

88. ## Physics

In the drawing, the weight of the block on the table is 430 N and that of the hanging block is 165 N. Ignore all frictional effects, and assuming the pulley to be massless. (a) Find the acceleration of the two blocks. (b) Find the tension in the cord.

89. ## Algebra 2

A Rectangular Field is to be enclosed by a fence and divided into three parts by another fencer. Find the maximum area that can be enclosed and separated i this way with 500 meters of fencing

90. ## calculus

Use the Intermediate Value Theorem to prove that the equation has a solution. Then use a graphing calculator or computer grapher to solve the equation. 2x^3-2x^2-2x+1=0 i am completely lost & have no idea where to start.

91. ## math

two girls caught 25 frogs. lisa caught four times as many as jen did. how many frogs did jen catch

92. ## com/170

• Write several sentences describing a recent interaction with a friend or family member about personal finance or credit cards. This interaction may be imagined or real. • Use at least five different pronouns, adverbs, and adjectives in your

93. ## Math

Two rectangles have an area of 81 square inches. Name two possible perimeters for the rectangles

94. ## Pittsburgh public school

There are a total of 10 blocks in the blocks. Bassein the results of Emily 20 draws, how many yellow, green, red and blue blocks would you expet to be in the bucket? Explain

95. ## physics

blocks A and B weigh 10 lb and 40 lb, respectively. A and B extend over a fixed drum, one on reach side. Determine the acceleration of A and the tension in the cord if the fixed drum is smooth.

96. ## Statistic

Statistic Question: I want to first start out by thanking you for your help and I also want to inform you that I do not have a strong Math back ground and is taking an Accelerated program that included this class of which I do not understand a word of so I

97. ## statistics

4. The scores on a university examination are normally distributed with a mean of 62 and a standard deviation of 11. If the bottom 5% of students will fail the examination, what is the lowest score, to the nearest whole number, that a student can have and

98. ## English

Hello. Please help me to choose the correct (or a better word): The president "offered, proposed, suggested" his program. The verbs look like synonyms. Are all of them possible in this context? Thank you for your help.

100. ## calculus

suppose the endpoints of one side of a rotated square are (-5,-5) and (1,-1). Find the dimensions and area of the square

101. ## Calculus

what is the slope of the tangent to the graph of f(x)= ln [cos(x)] at x= pi/6 ???

102. ## Chemistry

A compound contains only hydrogen and nitrogen and is 12.6% hydrogen by mass. A gaseous sample of the compound has density of 0.925g/L at 690 torr and 110 degree Celsius. What is the molecular formula of the compound?

103. ## Town View

How would a drop of water effect the freezing point of acetic acid?

104. ## Physics

The drawing shows a large cube (mass=42 kg) being accelerated across a horizontal table by a horizontal force P. The coefficient of kinetic friction between the table and large cube is 0.24. A small cube (mass= 5.0 kg) is in contact with the front surface

105. ## physical chemistry

1 kg aluminum dumbbell initially held 2 meters above the floor is allowed to fall. This experiment is performed inside a room whose dimensions are 10m × 5m × 3m. Assuming that the walls of the room do not conduct heat and that the room is empty (no other

106. ## functions

john's paint crew knows from experience that its 18 ft ladder is particularly stable when the distance from the ground to the top of the ladder is 5 ft more than the distance from the building to the base of the ladder. in this position, how far up the

107. ## social studies

Where was indiana's first battle in the civil war

108. ## COLLEGE ALGEBRA

SUBTRACTING... 5x^4+3x^2-2x -5x^4-3x^2+9x _______________ 0x^4+x^2+7x is this right?

109. ## COLLEGE ALGEBRA

SUBTRACTING... 5x^4+3x^2-2x - 5x^4-3x^2+9x _______________ 0x^4+x^2+7x is this right?

110. ## Finance

Jud Wheeler signed a contract to purchase 10 acres of land in Idaho from the Krauses. If Jud offered the Krauses considerably less for their property than its possible market value and the Krauses accepted the offer, could they avoid the contract on later

111. ## Chemistry

Consider the flasks diagrammed below. What is the total pressure in torr after the stopcock between the two flasks is opened? He(g)---> V=1.25L and P=0.300atm and Ar(g)---> V=2.50L and P=233 torr.

112. ## Algebra 1

Solve the system of equation by graphing. Then classify the system. 4x-y=11 4x+5y=-31. Thank you.

113. ## MATH

a golf ball dropped onto a hard surface rebounds exactly 1/3 of the height from which it falls. how far will it rebound after hitting the surface for the third time if it initially dropped from a height of 18 feet

114. ## chemistry

arrange these seven substances in order from highest melting point to lowest melting point. H2O, MgO, CCl4, CH2Cl2, CaCl2, N2, PF3

115. ## physics

Two girls each weight 500 N. Ride in a car traveling at 20.0 m/s. One wears a seat belt. The other does not. In an accident the girl wearing the seat belt is brought to a stop in 0.120 seconds. The dashboard brings the other one to a stop in only 0.00800

116. ## Chemistry

Hi Please help Initial [Fe3+] = 0.00050 M Initial [SCN-] = 0.0010 M Equilibrium [Fe(SCN)2+] = 5.7 x 10-5 Find [Fe3+]E and [SCN-]E (in mol/L) Find K. Balanced equation is: Fe3+ + SCN- -> Fe(SCN)2+ (reversible) I know I can get K if I have the equilibrium

117. ## math

A 10 kg quantity of a radioactive isotope decays to 3 kg after 17 years. Find the decay constant of the isotope.

118. ## Math

(5x2 -4x)(3x2+2x)

119. ## math

A 10 kg quantity of a radioactive isotope decays to 3 kg after 17 years. Find the decay constant of the isotope.

120. ## math

A 10 kg quantity of a radioactive isotope decays to 3 kg after 17 years. Find the decay constant of the isotope.

121. ## CALCULUS

a. for y= sinx y=0 and x=pie/2 if each cross section is an equilateral triangle perpindicular to the x axis what is the total area? b.also same question except triangles are perpindicular to y axis answer's are appreciated but i need the work more.

122. ## math

A 10 kg quantity of a radioactive isotope decays to 3 kg after 17 years. Find the decay constant of the isotope.

123. ## math

A 10 kg quantity of a radioactive isotope decays to 3 kg after 17 years. Find the decay constant of the isotope.

124. ## language art

What is the writing style of the book the Tiger Rising by KATE DECAMILLO?

125. ## math

A 10 kg quantity of a radioactive isotope decays to 3 kg after 17 years. Find the decay constant of the isotope.

126. ## Math

write an equatioin that models how old in years eaach will be 60,55,8 when your ages add up tp 1250 years old.

127. ## math

A 10 kg quantity of a radioactive isotope decays to 3 kg after 17 years. Find the decay constant of the isotope.

128. ## Math

write an equation that models how old in years each will be 60,55,8 when your ages add up to 150 years old.

129. ## Physics

So for each of the statements we have to write true or rewrite the part in Caps to make the sentence true. I'm only stuck on a couple. 1. On a position-time graph, the average velocity equals the run MULTIPLIED by the rise. 2. A child drops a ball. The

130. ## Chemistry

The velocity of light is 1.86 × 108 mi/hr. The distance of Mercury from the Sun is approximately 5.78 × 107 km. How many minutes will it take for light from the Sun to travel to Mercury?

131. ## statistics

Approximately 16% of undergraduates at the University have a writing score above 68 (on a 100 point scale). Note: writing scores are normally distributed. if a standard deviation is 8 what is the mean writting score

132. ## Calculus

let f(x)=x*e^x For what value of x is the slope of the line tangent to the graph of function f at [x,f(x)] equal to 1/2?

133. ## math

Find the point (o,b) on the y-axis on the y-axis that is equidistant from the points (1,1) and (2,-1)

134. ## pre cal

using formula v=-b/2a, 4ac-b^2/4a graph the quadratic function f(x)=x^2-6x+5

135. ## Math

The solids in each pair are similar. Find the surface area for solid B. Solid A: Surface area = 25 units squared. Scale factor = 5

136. ## Chemistry 101

How many milliliters of a 0.14 M NaOH solution contain 0.158 mol of NaOH?

137. ## math

Plot the points A(2,2), B(4,6),C(10,-2)Notice that these points are vertices of a right triangle (the angle is 90 degrees). Find the area of the triangle ABC:

138. ## Commerse

What is the difference between private and public sector bank

139. ## Algebra

What is 3y to the 4th power divided by 6y to the negative 4 power

140. ## math

= (1/4) - (sqrt3)/4) = ?

141. ## english-1B

Is the climax on "The Story of an Hour by Kate Chopin artistically effective?Explain in 7 to 10 sentences.

142. ## human service

Do you write a rites of passages, the same way you would write a research paper? Do you know where I can find a sample paper?

143. ## math

one of your friends is heading north for a holiday and the other is heading south . If their destinations arre 1029 miles apart and one car is traveling at 45 miles per hour and the other is traveling at 53 miles per hour . How many hours before the two

144. ## Physics

A 31.0 kg crate, initially at rest, slides down a ramp 2.6 m long and inlined 14 degrees with the horizontal. Using the work-kinetic energy theorem and disregarding friction, find the velocity of the crate at the bottom of the ramp

145. ## Algebra 1

solve the system by graphing. Then classify 2x-y=12 2x+3y=4. Thank you

146. ## Chemistry

How many moles of dinitrogen pentoxide are needed to produce 1.25 moles of nitric acid?

147. ## Geometry

What is the length of the midsegment of the trapezoid made by the vertices A(0, 5), B(3, 3), C(5, -2) and D(-1, 2). Show equations and all work that leads to your answer.

148. ## Physics

I have a few questions to answer and I don't know how to start answering them. 1. On a position time graph, compare the instantaneous velocities of an object when the tangent to the curve slopes upward to the right, when the tangent slopes downward to the

149. ## trig

Tan x cot x -1=1-sec x cos x

150. ## math

A box must have base x cm by 2x cm. what are the dimensions of the box of maximum volume if its length+width+depth

151. ## Algebra 1

The everton college store paid \$1668 for an order of 44 calculators. The store paid \$18 for each scientific calculator. The all graphic calculator cost \$55. How many of each type of calculator was ordered?. Here is a challenging one. I appreciate you help.

152. ## math

A box must have base x cm by 2x cm. what are the dimensions of the box of maximum volume if its length+width+depth

p-4=-9+p

154. ## physical

what is the minimum length of the mirror needed to view the whole body at any distance?

155. ## social studies

what factors affect climate? name and describe one of the climate regions of the united states. read climate and people. then fill in the blanks. vocabulary.

156. ## cHEMISRTY 101

(A) What is the mass of 150 mL of a liquid with a density of 1.4 g/mL

157. ## chemistry

how to prepare approximately 100 ml of a .12M copper (II) chloride solution using a 50.5% by mass copper (II) chloride that has a density of 1.05 g/ml

158. ## calculus

Suppose that f(x)= square root of x and g(x)= 3x-4 and you are asked to evaluvate the composite function f(g(0)). What is the complication that occurs in trying to find that composite function value? For waht values of x is it possible to evauvate f(g(x))?

159. ## math

how do I solve (4x^2-9y^2)/2x+3y)

160. ## chemistry

How many grams of sodium chloride are needed to prepare a 0.400m NaCl solution that contains 750g of water?

161. ## math

a boy walks 50m from the bottom of a building lies down and notes that he has to raise his eyes through 42 degree from the horizontal. what is the height of the building? i am doing tan(42)=x/50 but the answer is supposed to be 45m. how do i get that?

162. ## math

how do I solve (4x^2-9y^2)/2x+3y)

163. ## Math

two sides of a triangle are 6 and 8 cm. find the range within which the length of the third side of the triangle should lie.

164. ## Chem (but i think its physics)

Ok so this problem appeared in my online chem homework, but it looks alot more like a physics problem. I have no idea how to do it A 203 lb man eats an order of French Fries consuming 250 Cal of food energy. Afterwards he feels guilty and decides to work

165. ## algebra

The length of the side of a rectagular desk is given by 9x-2y cm. The length of the front is given by 9x+2ycm. What is an algebriac expression for the area of the top of the rectangular desk? Including correct units

166. ## Algebra

Find all complex solutions of 4x^2+5x+2=0.

167. ## English

Hello. Please tell me if it is possible to say in English: 1)thousands of protesters "came out in (?)the streets". (meaning "took to the streets"; is the preposition "in" correct?) 2)The French foreign minister "conducted" a meeting with his British

a gun tilted upward at 30 degrees fires a bullet with a speed of 215 m/s. what is the bullets velocity parallel to the ground

169. ## Accounting Ethics

Please, please, please help me!! I got 95% on the appendix B matrix about consequentialism, deontology, and virtue ethics. I also understand the 3 approaches to decision making the 5-question, Pastin's and Moral Standards approaches, but do not understand

170. ## Algebra 1

The Everton college store paid \$1668 for an order of 44 calculators. The store paid \$8 for each scientific calculator. The others, all graphing calculators, cost the store \$55 each. How many of each type of calculator was ordered? Sorry! Actually, it was

171. ## 5th math

7/10 - W= 1/2 solve for W

172. ## Algebra 1

The Everton college store paid \$1668 for an order of 44 calculators. The store paid \$8 for each scientific calculator. The others, all graphing calculators, cost the store \$55 each. How many of each type of calculator was ordered? Sorry! Actually, it was

173. ## Geometry

A wheel of a motor home has a diameter of 32 inches. How far will the wheel travel in 5 revolutions?

174. ## Socials Studies

The puritans had a long-lasting effect on English society and, to some extent, our own. What would be some aspects of society today that seem "puritan" in origin? I really need help on this.. Please, and thank you :-)

175. ## algebra

A gardner wants to create a rectangular garden with length of 2x-8y ft. and with of 3x-4y ft. What is an algebriac expression for the area of the garden? multiply this out, express in simpliest mathematical form, include units

176. ## Math

An instructor has graded 23 exam papers submitted by students in a class of 24 students, and the average so far is 73. (The maximum possible score is 100.) How high would the score on the last paper have to be to raise the class average by 1 point?

177. ## math

I am trying to find the coordinates of a point in a line. I have one end, and I have the midpoint. What formula should I use to find the one on the end? The one end is (8,4) and the MIDPOINT is (14, 7). What would I do to find the opposite point?! thanks!

Where was the site for the Battle of Gettysburg in the Civil War? Thanks!

179. ## Math

Why does the division of zero equal one? I just do not understand the process. I've researched it and I have read the responses, but I do not understand them. Can Someone explain it further?

180. ## algebra

(36x^3-60x^2-87x-21)divided by 9x+3

why is the median net worth a more useful measure than the average net worth. this is the answer i put: Median net worth is a more useful measure than the average networth because its gives you the exact number quality total of each product we are

Where was the site of the Battle of Fort Sumter in the Civil War? Thanks!

183. ## Ethics Accounting

I got 95% on the appendix B matrix about consequentialism, deontology, and virtue ethics. But do not understand this assignment about stakeholder impact analysis. Can someone please get me started? Describe, in 200 to 300 words, how you might conduct a

184. ## Science

How is a parasitic relationship like a predator-prey relationship?

so i thought about what i should write about and my subject is chores! what do you think:)

186. ## Pre-Calculus

Cost,Revenue,and Profit: Estimate the number of scanners that would produce a maximum profit when p is the price per scanner and x is the number of scanners. p= 100-0.0001x and the cost for producing x scanners is C= 350,000+30x and the profit for

187. ## Math

How do u find the widths of a triangle if their areas are less than or eqaul to 1200 in sqaured??

188. ## texas history

Why did Felix Houston and his fellow US adventures want to attack Mexico again?

189. ## Physics

A glider of length 12.3 cm moves on an air track with constant acceleration. A time interval of 0.637 s elapses between the moment when its front end passes a fixed point A along the track and the moment when its back end passes this point. Next, a time

190. ## chemistry II

If a 2.15-g sample of gas occupies 750. mL at STP, what is the molar mass of the gas at 125 degrees celcuis

191. ## math

What is 58 rounded to the greatest place value?

192. ## chemistry

A balloon filled to its maximum capacity on a chilly night at a carnival pops without being touched when it is brought inside. Explain this event.

193. ## physics

A golf ball of mass 4.50 10-2 kg is struck by a club. Contact lasts 2.35 10-4 s, and the ball leaves the tee with a horizontal velocity of 59.0 m/s. Compute the average force the club exerts on the ball by finding its average acceleration. what is the

194. ## math

how many teaspoons would you have to fill and pour into a 1 Liter bottle to fill it up?

195. ## Physics

An ob ject is released from rest on a planet that has no atmosphere. The ob ject falls freely for 5.04 m in the ﬁrst second. What is the magnitude of the acceleration due to gravity on the planet?

196. ## Physics

Two skaters, a man and a woman, are standing on ice. Neglect any friction between the skate blades and the ice. The mass of the man is 81 kg, and the mass of the woman is 60 kg. The woman pushes on the man with a force of 50 N due east. Determine the

197. ## physics

The Sum Is a Third Vector A, which is directed along an x axis, is to be added to vector B, which has a magnitude of 3.5 m. The sum is a third vector that is directed along the y axis, with a magnitude that is 7 times that of A. What is the magnitude of A

198. ## Algebra

The number of bacteria in a certain population increases according to an exponential growth model, with a growth rate of 11% per hour. An initial sample is obtained from this population, and after four hours, the sample has grown to 4130 bacteria. Find the

199. ## Physics

An automobile with an initial speed of 3.56 m/s accelerates uniformly at the rate of 2.7 m/s2. Find the displacement of the car after 4.1s.

201. ## College Physics

how much work is required to completely separate two charges (each -1.4 microcoulombs) and leave them at rest if they were initially 8 mm apart?

202. ## Physics- Exercise 10

A 500kg pig is standing at the top of a muddy hill on a rainy day. the hill is 100.0m long with a vertical drop of 30.0m. the pig slips and begins to slidedown the hill. What is the pig's speed at the bottom of the hill? Use the Law of conservation of

203. ## physics

Much much force is needed to push a container with wheels that weighs 250 pounds

204. ## physics

The drawing shows a 29.7-kg crate that is initially at rest. Note that the view is one looking down on the top of the crate. Two forces, F1=88N and F2=54N, are applied to the crate, and it begins to move. The angle is 55 degrees. The coefficient of kinetic

205. ## chemistry

Another “grand challenge” for engineering is managing the nitrogen cycle. Use the nature of the chemical bond in diatomic nitrogen to explain why any management is needed for this biogeochemical cycle. With so much nitrogen available in the atmosphere,

206. ## math

explain how abar graph and a pictograph are used to compare data?

208. ## statistics

If n=36, s=9 and t=2, what is the values of Xbar?

209. ## Physics

An elevator (mass 4700 kg) is to be designed so that the maximum acceleration is 6.00×10^-2 g What is the maximum force the motor should exert on the supporting cable? What is the minimum force the motor should exert on the supporting cable?

210. ## surveying

on a lake without any waves, how far from the shore is a sailboat when the top of 10 m mast disappears from view of a person whose eye height is one m above the water's edge

211. ## algabra

could you help me solve this 3x^2- 12x - 24 = 0

212. ## HISTORY

I need to write an essay, and I would appreciate if you would not send me to links, please. Here is the question: Write an article explaining how the United States’ containment policy affected one major aspect of the Cold War (Truman Doctrine, Marshall

213. ## physics

A football is kicked with an initial speed of 18 m/s at an angle of 36 degrees above the horizontal. (a) What is the maximum height that it reaches? (b) At what time does it land? (c) How far horizontally does it travel?

214. ## College Chemistry

A solution of sulfuric acid is 40.0% by mass and it has a density of 1.30g/mL, what is the molarity of the solution?

215. ## Managerial Accounting

Trottman, M. & Carey, S. (2000, October 19). American’s net soars, but high oil prices sting U.S. Airways. The Wall Street Journal. Submit a paper on one of the major topics listed below using one of the recommended journal articles found in the syllabus

216. ## Literary Analysis

I need help "translating" this part into more simple english from the poem One Step at a Time by Joseph Morris. Here is the part: "He will stand upon Life's summit and will know that joy sublime which is his alone who dares to prove his soul."

217. ## physics

A severe thunderstorm dumped 2.9 in. of rain in 30 min on a town of area 32 km2. What volume of water, in acre-feet, fell on the town?

218. ## algebra

5x^4+3x^2-2x -5x^4-3x^2+9x _______________ 0x^4+x^2+7x is this right?

219. ## algebra 1

Marcos drove twice as far as Candice. Together, they drove 66 miles. Which equation can be used to find the number of miles Candice drove? A) 3x = 66 B) 2x+1/2x=66 C) 3x = 66 + x D) 3x=66-x

220. ## physics

The engines of a 1.20 x 10^5 N rocket exert an upward thrust of 2.00 x 10^5 N for 1.50 minutes upon lift off. What is the impulse exerted on the rocket? What is the velocity of the rocket at the end of the 1.50 minute period?

221. ## algrebra 1

A secretary at the police department makes \$8 less per hour than the dispatcher. The combined hourly wage of the secretary and the dispatcher is \$40. Which equation could be used to find the hourly wage of the dispatcher? A) 2x + 8 = 40 B) 2x − 8 = 40 C)

222. ## Math

Ring the two equivalent fractions in each row.

223. ## physics

An athlete executing a long jump leaves the ground at a 30.3 angle and travels 7.68 . What is the take off speed? If this speed were increased by just 3.0%, how much longer would the jump be?

224. ## Math

Moira paid \$4.50 for a movie and 2 bags of popcorn. All together she spent 6 dollars. What's the cost for a bag of popcorn?

225. ## Pre-Calculus

P= -0.0001x^2+70x-350000 By graphing this what would be the number that would produce a maximum profit. I tried grapghing it but my calculator is not working with me! Is There another way to find the maximum number that would produce the maximum profit?

226. ## Calculus

Let f(x)=(4x^2 -7x +2)/(x^2 -16x +63) Find the equations of the horizontal asymptotes and the vertical asymptotes of f(x). If there are no asymptotes of a given type, enter NONE. If there is more than one asymptote of a given type, give a comma separated

227. ## chemistry

what mass of magnesium is needed to reduce a 500ml sample of oxygen at stp to a 375ml sample? Mg + O2--> MgO + O2

228. ## English

Can you please check my sentences? In particular I need to rephrase a Beatles' song called "Help". 1) In the song "Help" the Beatles (?) regret being young and self-assured (self confident?). In the past they were more independet and didn't need anybody's

229. ## chemistry

what mass of magnesium is needed to reduce a 500ml sample of oxygen at stp to a 375ml sample? Mg + O2--> MgO + O2

230. ## Perimeter and area

The gadget comes with a page of instructions. When page is unfolded, it is 81 square inches. If one page is nine inches wide what is the perimeter?

231. ## math

if a mans head is 8 times lager then a womans head and the mans head is 50cm, how big is the womans head?

4X+5+29

233. ## Math

whats a 30:1 ratio converted into centimeters?

234. ## science

what are two types of forces that effect motion?

235. ## Physics

how do you figure out take off speed?

236. ## Economics

I am given four pictures and I am asked to determine which are needs and which are wants. They are: -An airplane -A plate of breakfast(eggs, toast, beacon) -A child's bed -A sports car I think: airplane= want plate of breakfast= need Child's bed= need

237. ## physics

Two cars are driving toward each other on a straight, flat Kansas road. The Jeep Wrangler is traveling at 84 km/h north and the Ford Taurus is traveling at 43 km/h south, both measured relative to the road. What is the velocity of the Jeep relative to an

238. ## calculus

If f and g are continuous functions with f(-1) = 5 and the following limit, find g(-1). lim_(x->-1)[5 f(x) - g(x)] = 18

239. ## physics

A model sailboat is slowly sailing west across a a pond at.33m/s. a gust of wind blowing at 28 degrees south of west gives the sailboat a constant acceleration of magnitude .30m/s squared during the time interval 2.0 sec. if the net force during the

240. ## geometry

when an elephant casts a 2.5 meter shadow, a man 2 meters tall casts a 1.5 meter shadow. how tall is the elephant

241. ## essay writing

Which of the following will help you produce clear and effective writing? A. Brainstorming before writing. B. A rubric that provides criteria. C. The style of your paper. D. A solid thesis statement. I chose D.

242. ## physics

Traveling at a speed of 14.3 m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is 0.730. What is the speed of the automobile after 1.15 s have elapsed?

243. ## biology

how signals are propagated along a nerve?

In a gift wrapping department, a customer can choose from x different papers, y different ribbons, and z different greeting cards. There are 160 different paper, ribbon, and greeting card combinations. List three of the possible combinations.

245. ## Algebra

What is the complete factor form of the polynomial? -32a^6-28a^5-36a

246. ## Math

Quick survey assignment for math class regarding significant age gaps. Last minute assignment that requires me to collect raw data for the class, if anyone at all would be willing to spare a few moments to answer these questions, it would be greatly

247. ## essay writing

The first sentence of your introductory paragraph should do all of the following EXCEPT: A.Give the reader an idea of the subject matter. B.Include the title of the essay. C.Grab the reader's attention. D.Provide a thesis sentence. I chose D.

248. ## Math

52 over 16 = 105 over 28, what is the proportion in lowest terms. Im so confused Thank you!

249. ## Microeconomics

For the operator of a movie theater, the marginal cost (MC) of admitting one more person to the theater is zero. True or False? Why?

250. ## Maths

Perimeter = 216 and the length is (2X)+3 more than the width. How do I solve for X and what is the rectangle length. I am really stuck!

251. ## Math

In a gift wrapping department, a customer can choose from X different papers, Y different ribbons, and Z different greeting cards. There are 160 different paper, ribbon, and greeting card combinations possible. List three of the possible combinations.

252. ## chemistry

how many grams of beryllium chloride would you need to add to 125 ml of water to make a .050 molal solution

253. ## Algebra-still need some help

Homework Help Forum: Algebra Posted by Jena on Thursday, February 3, 2011 at 7:32pm. Find the domain of the function. f(x)=(sqrt x+6)/(-2x-5) Write your answer as an interval or union of intervals. Algebra - David, Thursday, February 3, 2011 at 7:42pm

254. ## geometry

I have a perimeter of 15. I am not a square . Each of my sides is 3 units long. What shape am i?

255. ## Math

Find the values of c and d if x^2-7x+5 is a factor of cx^3 + dx^2 +25.

256. ## math

sin 30degrees cos 240degrees + sin 210degrees sin 300degrees. -1/4 + sqrt3/4 what is the last step ?? the negative and positive signs confuse me ??

257. ## chemistry

what is metallic ductility

258. ## algebra

two people are 33 miles apart. they leave at the same time and travel towards each other. ted goes 10mph and fred goes 1 mph. how many miles will ted have traveled when they meet

259. ## MATH

explain how a bar graph and apictograph are used to compare data

260. ## chemistry

Calculate the moles of Cl atoms in 0.0565g of C2H4CL2 i got 6.87 x 10^20 mol Cl atoms

261. ## Chemistry

Compare and Contrast the atomic theories proposed by Democritus and John Dalton.

262. ## Biology

what kind of molecule is found in lipitor? is it found in the human body?

263. ## Chemistry

Maxine is studying about electrolytes in her chemistry class. The teacher asks her to test 4 different solutions to determine how well each one conducts electricity. which solution will best conduct electric current? a) HC2H3O2 b) C2H5OH c) KOH d) H2O2

264. ## Physics

why don't balls bounce as high during the second bounce as they do in the first?

265. ## Chemistry

Hydrogen gas has been suggested as a clean fuel because it produces only water vapor when it burns. If the reaction has a 95.4% yield, What mass of hydrogen forms 94 Kg of water?

266. ## Physics

A 37 kg child roller skates, initially at rest, rolls 2.0 m down an incline at an angle of 17 degrees with the horizontal. If there's no friction, what is the kinetic energy of the child at the bottom of the incline?

267. ## Environmental Science

if the discharge of a river is 4m^3/s and its concentration is 4ppm of mercury how much mercury is being brought in everyday?

268. ## algebra

One side of a rectangle is 12 inches, and the other side is x inches.What values of x will make the perimeter at most 44 inches?

269. ## intermolecular forces

arrange these seven substances in order from highest melting point to lowest melting point. H2O, MgO, CCl4, CH2Cl2, CaCl2, N2, PF3

270. ## chemistry

explain why ethanol bails at 73degress celcius

271. ## math

3 Students put together a 60-page story. Sam did 1/4, Sarah did 1/3, and James did 1/6. What is the percentage Mike will do?

272. ## biology

is my biology paper good so far? Im not done. its about lifestyle disease A lifestyle disease (also called diseases of longevity or diseases of civilization) is an inappropriate relationship between people and their environment that results to having a

273. ## Physics

A 31.0 kg crate, initially at rest, slides down a ramp 2.6 m long and inlined 14 degrees with the horizontal. Using the work-kinetic energy theorem and disregarding friction, find the velocity of th crate at the bottom of the ramp.

274. ## algebra

Train A and B are traveling in the same direction on parallel tracks. Train A is traveling at 80 miles per hr and train B is traveling at 88 miles per hour. Train A passes a station at 8:10 AM. If train B passes the same station at 8:40 AM, what time will

275. ## physics

On a string instrument of the violin family, the effective length of a string is the distance between the bridge and the nut. For a violin, this distance is 30 cm, while for a cello it is 36.6 cm. The string of a violin is placed in a cello with the

276. ## Physics

If you are pushing a box with 100 N of force and the maximum friction is 150 N. What is the net force of the box?

277. ## social studies

Why is there civil unrest in Egypt?

278. ## math

She has 16 bracelets. The number of earrings is 2 times the number of necklaces. she has 43 pieces of jewelry in all. How many of eac piece of jewelry does she have?

279. ## Calculus

A calculus teacher's son likes to shoot arrows. He was wondering at what speed the arrow leaves the bow when it is released. So they went to a large deserted beach at the Great Salt Lake and shot the bow at an angle of 45 degrees. The arrow hit the ground

280. ## Calculus

ccording to Richard Graham in "SR-71 Revealed: The Inside Story", the Lockheed SR-71 Reconnaissance plane accelerates from a standing start to a speed of Mach 3 (3 times the speed of sound) "in about 14 minutes". (During that time it also climbs to an

281. ## Socials

Colonies in the Wilderness 1814-1840 The Land Of Yesterday: (Im putting down paragraphs from my book to here as I want to shorten them in the end, and only gather the important key notes I need) The history of Canada has always been affected by its