# Questions Asked onOctober 13, 2012

1. ## Physic

A dam is used to block the passage of a river and to generate electricity. Approximately 58.4 x 103 kg of water falls each second through a height of 20.1 m. If one half of the gravitational potential energy of the water were converted to electrical

2. ## chem

net ionic equation. Aqueous acetic acid (HC2H3O2) is neutralized by aqueous barium hydroxide. i got H^+(g) + OH^-(g) --> H_2O(l) but it is wrong. are my states of matter wrong?

3. ## chemistry

What is the mass of 4.80 moles of MgCl2?My answer is: Mg=24.3 g/mole Cl2=35.5g/mole*2=71g/mole so, Mg 24.3+ Cl2 71= 95.3g/mole therefore 4.80 moles * 95.3 g/mole=471.84g Am i right pls correct me if i'm wrong thanks

4. ## math

One side of a right triangle is known to be 45 cm long and the opposite angle is measured as 30°, with a possible error of ±1°. (a) Use differentials to estimate the error in computing the length of the hypotenuse. (Round your answer to two decimal

5. ## Calculus

A metal cylindrical container with an open top is to hold 1 cubic foot. If there is no waste in construction, find the dimensions which will require the least amount of material.

6. ## physics 100

Bob, who has a mass of 60 , can throw a 800 rock with a speed of 26 . The distance through which his hand moves as he accelerates the rock forward from rest until he releases it is 1.0 . a) What constant force must Bob exert on the rock to throw it with

7. ## yetf8edfueidcyt87e

a farmer wishes to fence off a rectangular field with 1,000 feet of fencing.if the long side of the field is along a stream, express the area of the field as a function of its width

8. ## chemistry

Aluminum metal is exposed to atmospheric oxygen, it is oxidized to form aluminum oxide. How much heat is released by the complete oxidation of 24.2 grams of aluminium at 25°C and 1atm.

9. ## chemistry

Which will make you more wealthy, one mole of pennies (6.02e23 pennies) or one mole of gold atoms (6.02e23 atoms)?

10. ## physics

Sally applies a total force of 71 N with a rope to drag a wooden crate of mass 100 kg across a floor with a constant acceleration in the x- direction of a = 0.1 m/s2. The rope tied to the crate is pulled at an angle of  = 50  relative to the floor.

11. ## chemistry

calculate the molarity of an acetic acid solution if 25.00mL of the solution required 35.25mL of 0.1200M NaOH for neutralization.

12. ## math

an isosceles triangle is such that the vertical angle is four times the size of a base angle.what is the size of a base angle

13. ## chemistry

how many moles of Nitrogen are in 80g of N2O?

14. ## chemistry

in an experiment, 2.50g of salicylic acid is reacted with 10.31g of methanol. the yield of methyl salicylate, C8H8O3, is 1.27g. what is the percentage yield?

15. ## Algebra 2

The excursion boat on the river takes 2½ hours to make the trip to a point 12 miles upstream and to return. If the rate at which the boat travels in still water is 5 times the rate of the river current, what is the rate of the current? Which of the

16. ## chemistry

what is the balanced molecular formula and state for this equation Mg+Cr(C2H3O2)3=

17. ## PHYSICS

A bicycle is turned upside down while its owner repairs a flat tire. A friend spins the other wheel and observes that drops of water fly off tangentially. She measures the heights reached by drops moving vertically (see figure). A drop that breaks loose

18. ## physics

A circular plate of uniform thickness has a diameter of 56cm.A circular portion of diameter 42cm is removed from one edge of the plate .find the position of the center of mass of the remaining portion.

19. ## physical

Oasis B is a distance d = 8.0 km east of oasis A, along the x axis shown in the figure. A confused camel, intending to walk directly from A to B instead walks a distance W1 = 21 km west of due south by angle θ1 = 15.0°. It then walks a distance W2 = 30

20. ## Chemistry

At constant temperature, a sample of 3.0L of Argon gas at 2.0 atm is compressed until the new pressure is 3.524 atm. What is the new volume?

You want to have \$6 million in real dollars in an account when you retire in 40 years. The nominal return on your investment is 13 percent and the inflation rate is 5.1 percent. What real amount must you deposit each year to achieve your goal?

22. ## science-physics

A machine gun of mass 10 kg fires 20g bullets at the rate of 10 bullets per second, with the speed of 500 m/s. What is the force necessary to hold the gun in position?

23. ## Science- Chemistry

A test tube containing a mixture of compounds X, Y, and a small amount of Z weighs 25.4886 g. The tube is emptied into a beaker and the empty tube is reweighed, giving a value of 10.2586 g. The mixture is separated into two components by dissolving in

24. ## physics

1) Mass m1 = 0.7 kg moves with constant velocity v1i = 2.0 m/s along the x-axis and collides with mass m2 = 1.8 kg, which moves with velocity v2i = 3.4 m/s, as sketched below. After the collision, m1 and m2 stick together. Find the angle, θ, between the

25. ## chem

Could donuts be quantified in terms of mass instead of number? explain.?

26. ## Math

A right triangle is formed in the first quadrant by the x- and y-axes and a line through the point (3,2). write the length L of hypotenuse as a function of x.

27. ## math

Find the area of the triangle whose vertices are (2,3),(3,4),(-2,-4).

You want to have \$6 million in real dollars in an account when you retire in 40 years. The nominal return on your investment is 13 percent and the inflation rate is 5.1 percent. What real amount must you deposit each year to achieve your goal?

29. ## english

5. Identify which of the two sentences below contains a verb agreement error. Then, explain how to correct the problem. a. Among the guests was a private detective. b. Neither of those mattresses feel comfortable

30. ## chemistry

if 16.o ml HCL is needed to neutralize from a 2.25g sample of organic material, calculate the mass percentage of N in the sample

31. ## Algebra 1

oops -for my last question i meant rectangle

32. ## Anntarctic

What is the Antarctic Treaty System?

asked by rawr... im a dinosaur.... rawr
33. ## physics

Two identical balls are moving at the same speed of 3 m/s toward each other. With no external forces acting, what would be the magnitude (value) of the total momentum of the two balls after collision? (Express your answer as a number, not in words)

34. ## Math

Colin's back yard is 720ft.In his estimation, the fallen leaves that covered his backyard is 2/3 of his yard. (Answer:480ft right) Colin measured the volume of fallen leaves in a 1ft by 1ft section of his back yard to be 432 in3. If leaves fell uniformly

35. ## Physics

When races are timed manually, timers start their watches when they see the smoke from the starting gun rather than when they hear the gun. How much error is introduced in timing a 100-m race if the watch is started on the sound rather than on the smoke

36. ## Math

How do you solve this equation; There are 128 7th graders at Mark's school, if there are 16 more girls than boys, how many 7th grade boys are there?

37. ## Math.. how to get linear function

The total length y is a linear function of the tail length x with great accuracy. The domain is the interval from 30mm to 200mm, and the range is the interval from 200mm to 1400 mm. The following two points are given: X0= 60mm, Y0= 455mm, X1=140mm, Y1=

38. ## Physics

When a spacecraft travels from the Earth to the Moon, both the Earth and the Moon exert a gravitational force on the spacecraft. Eventually, the spacecraft reaches a point where the Moon's gravitational attraction overcomes the Earth's gravity. How far

39. ## Algebra

A scuba diver dives 100 feet below the waters surface. Later she rises 78 feet. How far below the surface is the diver?

40. ## art

hundert wasser

41. ## PHYSICS

An object with a mass of 14kg lies on a frictionless incline. A rope attached to the mass runs parallel to the incline and is connected to a wall at the top of the incline. If the rope is considered to be in static equilibrium what is the tension of the

42. ## math- surface and volume

If volume increases by 60%, how much does the surface increase by? Please show work.

43. ## criminal Justice

Select a city, town, or municipality and examinends trends in criminal activity over the last 3 yearse

If fixed costs are \$20,000,000, variable cost per inpatient day are \$450, average length of stay is 3.3 days, and volume is 8,000, what revenue per patient day must the hospital make in order to make a profit of \$500,000?

45. ## Physics

A 345N load is suspended from a cable. What is the acceleration of the load if the tension in the cable is 275N£¿

46. ## newton's law

Find the acceleration and tension in an Atwood's machine. Two different masses connected by a string over a pulley which is at rest.

47. ## Math

Find the parabola with equation y = ax^2 + bxwhose tangent line at (2, 12) has the equation y = 14x − 16

48. ## math

square root of -64

49. ## physical science

A 0.50 kg block initially at rest on a frictionless horizontal surface is acted upon by a force of 8.0 N for a distance of 7.5 m. What is the velocity of the block in m/s?

50. ## Math

At what point on the curve y = 6 + 2e^x − 3x is the tangent line parallel to the line 3x − y = 1?

51. ## Chemistry

A bowl of 471 g of water is placed in a microwave oven that puts out 591 watts (J/s). How long would it take in seconds to increase the temperature of the water from 12.0oC to 53.3oC? Use SF. I'm not really sure how to do this, so any help would be

52. ## pre-cal

find the intercepts of y=2x-4

53. ## pre-cal

find the center (h,k) and radius r of the circle and then find the intercepts, if any. 5x^2+30x+5y^2=0

54. ## Math..solve for u

Solve u-2[2=3 [ is square root. Please show work

56. ## English-SEC Football

What would be 3 good subpoints for this mainpoint National Championship Records/Bowl Records?

57. ## random math queastion

√x^2+2 Is this possible as is?

58. ## math

what is the property of 3455 multiplied by 1 = 3455

59. ## physics

1) Mass m1 = 0.7 kg moves with constant velocity v1i = 2.0 m/s along the x-axis and collides with mass m2 = 1.8 kg, which moves with velocity v2i = 3.4 m/s, as sketched below. After the collision, m1 and m2 stick together. Find the angle, θ, between the

60. ## newton's law

A block of mass M is projected up a frictionless inclined plane with a speed VO. The angle of incline is given as theta. a. How far up the plane does it go? b. How much time does it take to get there? I was stuck after Fg(cos(theta+90)= Ma_x

61. ## Driving

Hey i begin to drive and can someone please tell me about parking break. Before I back out of driveway, do I shift gears first, or parking break first and then gears? And what about when I pulling into driveway and going to park, do I do gear first or

62. ## pre-cal

find the equation of a line that is perpendicular to the line y=1/6x+7 and contains the point (-5,0) y= (Type your answer in slope intercept form)

63. ## Math

u-2√u=3. what is u?

64. ## grammar

"He kicks his feet in the water." What are the nouns

65. ## math

define a variable and write an equality for each situation the maximum speed allowed on main st is 25 miles per hour a trainer advises an athlete to keep rate under 140 beats per minute

66. ## math

4(3) squared do u times 4 by 3 and then square it or 1st square 3 then multiply the answer by 4

67. ## math. solve for t

1/1024=42*0.5^(t/12.5) Solve for t. Please show work. Much appreciated!

68. ## Chemistry

What is the maximum mass of S8 that can be produced by combining 80.0 grams of each reactant? 8SO2 + 16H2S -> 3S2 + 16H2O

In a tracer method the potassium isotope 42K is used for labelling. The half life of 42K is 12.5 hours. If No is original number of atoms, how many hours will it take until only (1/1024) No Atoms remain? The answer is 125 hours but I do not know how to get

70. ## Physics

A football player throws a ball with a horizontal distance of 31.0 m so that the other player catches it at the exact height it was initially thrown. If the ball rises and falls by 1.8 m in its trajectory, what is the initial velocity of the ball? Please

71. ## Computing Essentials

What is considered a line of sight communication medium?

72. ## chemistry

molecular weight is 284.5 g/mol what is the molecular formula.76.0% C, 12.8% H, 11,2%O.

73. ## AP Physics

A frictionless plane is 13.1 m long and inclined at 39.8 deg;. A sled starts at the bottom with an initial speed of 4.99 m/s up the incline. When the sled reaches the point at which it momentarily stops, a second sled is released from the top of the

74. ## algebra

For the statement that says: b + (-a) = b - a What property would that be? Is it the addition property of equality? or something else.

75. ## Math 8R - help!!!!!!!

Combining Like Terms 1. 3a + a = 16 2. 9x - 3x = 30 3. 5w + 3w = 24 I really need help with this, can you at least do one or two for me so I can do the other problem.

76. ## pre-cal

for the given functions f & g find the specified value of the following functions and state the domain of each one. f(x)=2+6/x; (g)x 6/x a. (f-g)(3)= what is the domain of f-g? b. (f/g)(6)= what si the domain of f/g?

77. ## math

i need help in math can someone help me

78. ## Math

How do you graph the line y = 3x + 2.

79. ## City College

Galileo is riding on top of a horse that is gallop- ing at 11 ft/s due east. A minute into his ride, Galileo pulls a key out of his pocket, and holds it over the side of the horse. When he lets go, the key falls 3.0 ft vertically to the ground. a). How far

80. ## World History

Name three of the German tribes that attacked Rome's western frontiers.

81. ## math

calculate the angles of an isosceles triangle in which each base angle in four times the vertical angle

82. ## chemistry

Which one is greater in terms of number of atoms Na or S. Which one is greater in terms of mass, a mole of Na atoms or a mole of S atoms.

83. ## Statistics (Math)

A government report looked at the amount borrowed for college by students who graduated in 2000 and had taken out student loans. The mean amount was = \$ 17 , 776 and the standard deviation was s = \$12,034. The quartiles were Q 1 = \$9900, M = \$15,532, and Q

84. ## Science

How can community growth affect local ecosystems?

85. ## Math

Which Statements of congruence are true and which are false and why? 177 _= 17 871 _= 713 1322 _= 5294 5141 _= 8353 13944 _= 8919 67 x 73 _= 1 x 3 17 x 18 x 19 x 20 _= 4! 83 (144 power) _= 15 (144 power) Their not equals signs...they are three lines on top

86. ## chemistry

A 500 mL sample of solution of H2SO4 was titrated with 60 mL of 1.5 M KOH. What was the molarity of the H2SO4 sample?

87. ## Foreign languages

How do you write in the Fiji language? Hello dear, how was your day?

88. ## accounting

imageshack.us/a/img404/2843/img00129201210132042.jpg if over 600 units, fixed costs goes up 20% how do i get each blank?

89. ## Math

How many integers bewteen 200 and 500 inclusive leave a remainder 1 when divided by 7 and a remainder 3 when divided by 4? Find the smallest positive integer that leaves a remainder 5 when divided by 7, a remainder 6 when divided by 11, and a remainder 4

90. ## market

Target marketing, in contrast to mass marketing,

91. ## Math. Increases

The worlds pop in 1970 is estimated to be 3.7*10^9. The yearly growth rate is approximately 2%. How large would the world's pop be in 1980? Please show work. Thanks :)

92. ## Physic

I am confuse about this one question can some one please help me. The Navy wants a new airplane launcher for their aircraft carriers and you are on the design team. The launcher is effectively a large spring that pushes the plane for the first 3.49 meters

93. ## sociology

In "Some Moral Minima," Lenn Goodman argues that there are certain things that are simply wrong. Do you think Goodman is right? Using specific examples, explore the challenges Goodman presents to relativism. Determine whether you think there are such

94. ## english

sara and saira's grandfather correct the sentence

95. ## Math. Increases again

The worlds pop in 1970 is estimated to be 3.7*10^9. The yearly growth rate is approximately 2%. How large would the world's pop be in 1980? Would i use log functions? please help.

96. ## finance

You have been given the following information on a project: It has a 3-year lifetime The initial investment in the project will be \$28 million, and the investment will be depreciated straight line, down to a salvage value of \$6 million at the end of the

97. ## math

There are three pieces of rope with the lengths 15 1/3feet, 20 1/2 feet, and 30 3/4 feet. A) how many yards in all? B) If thery were all cut into 3 feet pieces how many would you get and how did you determine this answer C) How much rope is left? How was

98. ## Math

On his 13th birthday he was 112 cm tall and on his 14th birthday he was 121cm tall. Assume a geometric monthly growth rate. What is this rate? (%)

99. ## orgoo

calculate how to make 10 mL of 15:85 ethyl acetate:hexane solution from 2 mL of 5:95 ethyl acetate:hexane, using pure hexane and pure ethyl acetate.

100. ## SCIENCE

Why might there be different kinds of thermometers for measuring temperature?

101. ## Chemistry

The solution CrCl3 is not colored. What does this suggest about its electron configuration?

102. ## chemistry

Why would benzene boil at 100C instead of 80C?

103. ## Science- Chemistry

In the standard deviation, the decimal place of the first non-zero digit indicates where the precision of the average ends (decimal place where the individual results deviate from each other). All your mass readings have 5-6 significant figures, so one

104. ## math

find the functional values requested in the problem F(x)=x^2-25t (a)F(5t)= (b)F(6t)=

105. ## Chemistry

A molecule has a glycerol backbone. The branches off of the three carbons are as follows: o-co-(ch2)14 - ch3 o-co-(ch2)12 - ch3 o-co-(ch2)16 - ch3 What is this compound called?

106. ## pre-cal

what is the slant asymptote of the graph of the rational function and b use the slant to graph the rational function. f(x)x^2-x-20/x-6 a. y=? or either there is no slant rational function B. use the slant asymptote to graph the function(first determine the

107. ## SOC 101

soc 101 In most developed nations health care is?

108. ## physics

Hypothetically a pebble rolls off the roof edge of Golden Eagle Arena and falls vertically. Just before it reaches the ground, the pebble's speed is 17 m/s. Neglect air resistance and determine the height of Golden Eagle Arena's roof edge.

109. ## Physics

The fastest recorded pitch in Major League Baseball was thrown by Nolan Ryan in 1974. If this pitch were thrown horizontally, the ball would fall 0.809 meters by the time it reached home plate, 18.3 meters away. How fast was the pitch? So for i know that

110. ## physics

Hypothetically a pebble rolls off the roof edge of Golden Eagle Arena and falls vertically. Just before it reaches the ground, the pebble's speed is 17 m/s. Neglect air resistance and determine the height of Golden Eagle Arena's roof edge.

111. ## statistics

A researcher wants to study the spending habits of customers of a local shopping mall. The mall manager claims that the average spending per customer is \$70, but the researcher believes that the average is less than \$70. A simple random sample of 350

112. ## Chem(Project help)

I need a chemist who discovered something we use in everyday life for a project does anyone know any? THanks a ton

113. ## physics

A scraper is drawn over a tooth 22 times, each time moving a distance of 0.75 cm. The scraper is held against the tooth with a normal force of 5.4 N. Assuming a coefficient of kinetic friction of 0.90 between the scraper and the tooth, determine the work

114. ## Math

Let a be an integer, then there are integers X, Y such that aX+(a+1)Y=1. Find the smallest positive value of Y.

115. ## Physics

Two spheres are launched horizontally from a 1.0 -high table. Sphere is launched with an initial speed of 4.5 . Sphere is launched with an initial speed of 3.0 . What is the time for the sphere A to hit the floor? What is the time for the sphere B to hit

116. ## biology project

i want a topic for investigatory project of biology...

117. ## Chemistry

I need to find the average molar mass of an unknown element. The atomic mass is 120; the mass numbers of isotopes are 295, 296, 297, 298 and 299; the percent of each isotope is 2.356%, 4.325%, 15.652%, 48.452% and 29.215%. The mass of the neutron is

118. ## chemistry

Q1) How many resonances are expected in the 13C NMR spectrum of propan-1-ol? Q2) A student measures the EMF of the following electrochemical cell at 31oC in a solution that is 0.22 molL-1 in Hg2+ against a Saturated Calomel Electrode as the reference. The

119. ## physics

A young woman named Kathy Kool buys a sports car that can accelerate at the rate of 4.16 m/s2. She decides to test the car by drag racing with another speedster, Stan Speedy. Both start from rest, but experienced Stan leaves the starting line 0.58 s before

120. ## Physics

A gray kangaroo can bound across a flat stretch of ground with each jump carrying it 11 from the takeoff point. If the kangaroo leaves the ground at a 18 angle, what is its takeoff speed ? What is its horizontal speed?

find the mid point of the line segment joining the points P1 and P2. P1 = (3,5) P2 = (-4,7)

122. ## Econ

I have spent a few hours on this question. Can anyone help? The demand for Healthy Wheat Cookies is downward sloping, while the supply is upward sloping. Healthy Wheat Cookies are a normal good produced mainly from wheat and sugar. The government recently

123. ## Probability

Suppose P( A given B)= .6, P(at least one of the two events occurs)= .8, and P(exactly one of the two events occurs)=.6. Then P(A) is equal to? The answer is 2/3. Could someone please explain how to get it. Thanks so much!

124. ## physics

A parachutist with a camera, both descend- ing at a speed of 11.7 m/s, releases the camera at an altitude of 27.3 m. What is the magitude of the velocity of the camera just before it hits the ground? The acceleration of gravity is 9.8 m/s2 and air friction

125. ## Math

if n=45, calculate the number of cosets of An in Sn .

126. ## pre-cal

Can someone please show me how to find an equation for the line with the given properties. Parellel to the lines 3x-y= -3; containing the point (0,0) y= (then type your answer in slope intercept form)

127. ## Math {ASAP}

What is the value of the expression below? |-10| - |-15|

128. ## Math

Linda has 7/8 yard of fabric. She used 2/3 of it to make a purse. How much fabric did she use?

129. ## Algebra

The total amount of water in 2 containers is 35quarts. If 7 quarts gets poured from the container with less water into the continer with more water, the container with more water will have 4times as much water as the other container. How many quarts are in

130. ## Statistics

If you roll two dice what is the probablity of getting one 2? I think the answer is 1/6 but I'm not sure

131. ## chemistry

what fraction of an original sample of a radioactive isotope remains after three half-lives have passed? 1/8?

132. ## dentist

choose components of phosphate buffer

133. ## chemistry

if a reaction vessel contains 11.5g NH3, 12.0g O2, and 10.5g CH4, what is the maximum mass in grams of hydrogen cyanide that could be made?

134. ## Oakton College

How is dividing a polynomial by a binomial similar to or different from the long division you learned in elementary school? Can understanding how to do one kind of division help you with understanding the other kind? What are some examples from real life

135. ## Probability

Consider a deck of 52 cards with the following characteristics: 13 red cards, numbered 1 through 13 13 blue cards, numbered 1 through 13 13 green cards, numbered 1 through 13 13 black cards, numbered 1 through 13 1. Describe the steps necessary to

136. ## Bio- Botony

How is reproducing sexually and asexualy in plants an adaptation? thanks

137. ## english

Explain what is wrong with the following sentence and revise as needed to correct the problem: “I saw mountains of uncollected trash walking along the city streets.”

138. ## Physics

This is a projectile motion question. A ball with a mass of .4 kg, initially at rest is kicked directly toward a 3 meter fence from a point 20 meters away. The initial velocity is 17 m/s at an angle of 35 degrees. The ball is hit by nothing and there is no

139. ## World Geo

which country does not have territories in the pacific? United States Chile New Zealand China Chile?

asked by rawr... im a dinosaur.... rawr
140. ## Literature

How was Opheila mistreated by male characters in Hamlet.

141. ## Editoral

So a editoral for the school's newspaper writes advice to students in the school or there more than that.

142. ## General Chem

given the pH (7.15)of a solution at 25deg C what is the H3O+ and OH-