# Questions Asked onFebruary 11, 2011

1. ## physics

The meter stick in the drawing can rotate about an axis located at the 20.0-cm mark. The axis is perpendicular to the screen. A force F acts at the left end; the force is perpendicular to the meter stick and has a magnitude of 175 N. A second force, either

2. ## chemistry

I keep thinking that 3 is the van't hoff factor for ammonium chloride, but I keep getting my answer wrong. Any ideas?

3. ## Physics HELP ASAP PLEASE

A hawk is flying horizontally at 10 m/s in a straight line 200m above the ground. A mouse it was carrying is released from its grasp. The hawk continues on its path at the same speed for two seconds before attempting to retrieve its prey. To accomplis the

4. ## financial managerial accounting

Boeing Company is the largest manufacturer of commercial aircraft in the United States and is a major employer in Seattle, Washington. Explain why each of the following individuals or organizations would be interested in financial information about the

5. ## chemistry

determine the molarity of a 18 ml sample of HCl solution that is required to prepare 30 ml of 2.3 M HCl solution?

6. ## physics

how does temperature affect the time it takes to reach thermal equilibrium?

7. ## Math app

farmer Linton wants to find the best time to take her hogs to market. The current price is 88cents per pound, and her hogs weigh an average of 90 pounds. the hogs gain 5 pounds per week, and the market price for hogs is falling each week by 2 cents per

8. ## English

Does the word Promethean need to be capitalized or lower case letter? It is called a promethean board.

9. ## statistics/forecasting

The last 4 weekly values of sales were 80, 100, 105, and 90 units. The last four forecass were 60, 80, 95, and 75 units. These forecasts illustrate which answer: qualitative methods adaptive smoothing slope bias trend projection

10. ## physics

A pendulum bob is released from some initial height such that the speed of the bob at the bottom of the swing is 3.2 m/s. The acceleration of gravity is 9.81 m/s 2. What is the initial height of the bob?

11. ## physics

A 751 N diver drops from a board 9.10 m above the water’s surface. The acceleration of gravity is 9.81 m/s2 . a) Find the diver’s speed 3.00 m above the water’s surface. Answer in units of m/s.

12. ## Calculus Need of Urgent Assistance

Let f(x) = x3 − 7x2. Find the point(s) on the graph of f where the tangent line is horizontal. (x, y) = I already got the smaller value, but I'm not getting the larger value right

13. ## Physics

If a 60 kg person stands on a low wall with her full weight on the ball of one foot and the heel free to move, the stretch of the Achilles tendon will cause her center of gravity to lower by about 2.5 mm. What is the spring constant of her Achilles tendon?

14. ## Physics

A 70-kg ancient statue lies in the bottom of the sea. It’s volume is 3.0 x 10 4 cm 3 How . much force is needed to lift it? (Use g=10 m/s 2 and the density of water is 1.0 x 10 3 kg/m 3

15. ## Physics

A spy satellite is in circular orbit around Earth. It makes one revolution in 6.05 hours. (Radius of the Earth=6.371 106 m) (a) How high above Earth's surface is the satellite? What is the satellite's acceleration

16. ## math

the length of the base of a triangle is 4 times its altitude. if the area of a triangles is 162cm2 find the altitude

17. ## phyics

An athlete in a competition needs to get from point A to another point B directly across from a river. He can swim in stationary water at a speed of 2.0 mi/h, and he can run at a speed of 5.0 mi/h. If the river does not flow, then to get from A to B he

George Wilkins checked the spreadsheet where he keeps track of his assets and liabilities. He discovered that (i) he owes \$80,000 on his house, which he believes to be worth \$150,000; (ii) his car is worth \$20,000, against which there is \$2,000 on the

19. ## statistics

Please let me know if I solved this right The lifetime of television produced by the Hishobi Company are normally distributed with a mean of 75 months and a standard deviation of 8 months. If the manufacturer wants to have to replace only 1% of its

20. ## calculus

f(x)=3-5x , (-1,8) find the slope of the tangent line to the graph of the function at the given point how do you figure this out?

21. ## Organic Chemistry

Why does eugenol and d-limonene dissolve in dichloromethane?

22. ## Physics

Two waves are combined to form this standing wave equation of y(x,t) = (3 mm)sin[x/(2 m]cos[(100 rad/s)t] a. What's the amplitude of the right moving wave and left moving wave? b. What's the wavelength of the right moving wave and left moving wave? c.

23. ## Physics

A sprinter accelerates at 4 m/s2 for 3 seconds, and then runs the rest of the race at a constant speed. If the race is 100 m, how much time does the sprinter take to fi nish the race?

24. ## Physics

Two waves are combined to form this standing wave equation of y(x,t) = (3 mm)sin[x/(2 m]cos[(100 rad/s)t] a. What's the amplitude of the right moving wave and left moving wave? b. What's the wavelength of the right moving wave and left moving wave? c.

25. ## Medical Information management and office practice

Please check my answers. 1.Dr. Jones used an abbreviation that no one was familiar with. What can be done to prevent this from happening in the future? A. Ask the physician to take a course on medical abbreviations. B.Designate an approved abbreviations

26. ## Physics

A stone of mass 0.29 kg is tied to a string of length 0.55 m and is swung in a horizontal circle with speed v. The string has a breaking-point force of 85 N. What is the largest value v can have without the string breaking?

27. ## physic

A police car is travelling in a straight line with constant speed vp.A truck travelling in the same direction with speed 3/2 vp passes the police car.The truck driver realizes that she is speeding and immediately begins to slow down at a constant rate

28. ## Science

What does the Georgia Forestry Commission do? How can they do more to help? Website address please also.

29. ## child day care management

When properly executed, the behavior management strategy known as time-out becomes A.a positive reinforcer B. more effective then logical consequences. Ca conversation between child and adult. D. suitable punishment for misbehavior. pls help me is it D

Use the four step process to find the slope of the tangent line to the graph at any point: f(x) = -1/2(x^2)

31. ## math

factor the expression 81x^2-54xy+9y^2 into product of binominials

32. ## algebra B

Using the formula, w = cr^-2, solve for r. An object weighs 100lbs. What value of C will result in r = 3963? I have another question similar, but if someone could guide me in this one, I can figure out the other one. Thanks,

33. ## College Electric Physics

(a) What is the electric potential energy in joules of two electrons separated by 1.98 nm? (b) What would be it be if the separation was doubled?

34. ## HRM 240

Final Project paper. how do i go about setting up my paper to make sure i discuss all of the things that are being asked of me for my final paper.

35. ## Teacher's Aide: Helping Abused Children

1. The Stubborn Child Law enacted by Massachusetts in 1646 permitted parents to A. use corporal punishment when children disobeyed them. B. keep children out of school if they were needed for family work purposes. C. institutionalize a child born with a

36. ## CRIMINOLOGY

is a psychiatric evaluation always necessary to determine if a person exhibits antisocial behaviors? Aren't there some overt warning signs?

37. ## fundamental trigonometric indentities

tan^2x-sin^2x=tan^2xsin^2x

38. ## Chemistry

You begin with 100mL of air at 1 atm of pressure. How would you change the pressure in your machine to accomplish you goal of 500mL?

39. ## English

Hello. I'll appreciate it if you answer my questions: 1)is it possible to say "Thousands of Egyptians conducted a meeting in Cairo" (meaning "held a protest")or is the word "meeting" something like "discussion"? 2)is it possible to use "confine" in the

40. ## Calculus 1

Could you please explain how to find the slope using the definition of derivative of the function y=2*sqrt(x)

41. ## Physics

At the other end of what would come to be known as the Roman Empire, Parthian (Persian) archers were able to discourage pursuers by firing backwards from the back of a galloping horse-the famous "Parthian shot." a. If the speed of the arrow vB the

HA(aq)+ H2O (l) H3O+(aq)+ A¯ (aq) Given the reaction above, which of the following will cause an increase in the pH of an equilibrium mixture? Give all answers which apply. A) add KA B) add HA C) remove A¯ D) remove HA E) none of these will affect the

43. ## math

an equvalent expression of 84+mn is?

44. ## Physics 112

Three point charges with values = 4.00 , = 1.00 , and = 7.00 are placed on three consecutive corners of a square whose side measures = 5.00 . Point A lies at the fourth corner of the square, diagonally across from . Point B lies at the center of the

45. ## Physics

A 86.0-kg man is riding an escalator in a shopping mall. The escalator moves the man at a constant velocity from ground level to the floor above, a vertical height of 5.50 m. What is the work done on the man by each of the following forces?

46. ## Physics 112

Two stationary point charges of 5.00 and 2.00 are separated by a distance of 60.0 . An electron is released from rest at a point midway between the charges and moves along the line connecting them. What is the electric potential energy of the electron when

47. ## Chemistry

Which of the following forms a solid with non-directional covalent bonds? A) neon B) chlorine C) copper D) carbon E) selenium

48. ## trig

80 feet from the base of a tower the angle of elevation to the top is 36 degree find the height of the tower

49. ## Math

An isosceles triangle and a rectangle share a base. The area of the rectangle is 4 times the area of the triangle. The area of the triangle is 60 cm^2 and its height is 15 cm. Find the dimensions of the triangle.

50. ## Physics

2. On the inside of an airplane the air pressure is about 85% of the atmospheric pressure at sea-level while outside, when it is cruising, the pressure is about 25% of the sealevel atmospheric pressure. If a window is 0.46 m in diameter, what is the net

51. ## English

Can someone help me analyze this poem? I don't understand the poem From a Correct Address in a Suburb of a Major City By Helen Sorrels (1908) She wears her middle age like a cowled Gown, sleeved in it, folded high At the breast Charming, proper at

52. ## trig

Find the altitude of an isosceles triangle whose base in 30 cm vertex angle is 75 degres

53. ## trigonometry

can you correct the rest for me please? Express each as a function of theta: a. sin (270deg + theta)= cos theta b. cos (pi + theta)= -cos theta c. tan (810 + theta)= ????? d. sin (theta - 180)= -sin theta

54. ## Geometry

Describe the information you need in order to calculate a segment length in a right triangle

55. ## Chemistry Lab

When 0.671 g of Ca metal is added to 200.0 mL of 0.500 M HCl(aq), a temperature increase of 109C is observed. Assume the solution's final volume is 200.0 mL, the density is 1.00 g/mL, and the heat capacity is 4.184 J/gC. (Note: Pay attention to significant

56. ## Chemistry Lab

If the molecular mass for a chemical is 151.97 g/mol and the enthalpy of formation is -1128 kJ/mol, the heat change will bekJ when 10.0 g of this chemical is formed.

57. ## Physics

In recent years, a number of nearby stars have been found to possess planets. Suppose, the orbital radius of such a planet is found to be 3.3 1011 m, with a period of 1080 days. Find the mass of the star

58. ## Chemistry

When 0.934 g of CaO is added to 200.0 mL of 0.500 M HCl(aq), a temperature increase of 383C is observed. Assume the solution's final volume is 200.0 mL, the density is 1.00 g/mL, and the heat capacity is 4.184 J/gC. (Note: Pay attention to significant

59. ## Physics

A pendulum is 0.9 m long and the bob has a mass of 1.0 kg. At the bottom of its swing, the bob's speed is 1.5 m/s. What is the tension in the string at the bottom of the swing?

60. ## Chemistry

Based on the results of problems 8 and 9 if the heat of formation of water is -286 kJ/mol, The H ffor CaO(s) is kJ/mol.

61. ## AP European history

So, I'm supposed to answer the question: Europe during the Middle Ages in often imagined as an isolated and inward looking time in history. Defend or refute this statement. I don't know which way I should answer it, as defending it or refuting it. I mean,

62. ## physics

a nurse counts 76 beats in one minute. what are the period and frequency of the hearts oscillations?

63. ## physics

calculate the speed of waves in a puddle that are 0.15m apart and made by tapping the water surface twice each second

64. ## physics

the lowest frequency we can hear is about 20hz. calculate the wavelength associated with this frequency for sound that travels at 340m/s. how long is this in feet.

65. ## world history

can you check these answers for me please. 1.Among early hunting and gathering peoples, the commonly occurring mark that looks like a "P" is thought to stand for a? a. woman b.symbol for a calender c.favored animal d.powerful male leader 2.Relative to

66. ## AP European History

How did Medieval Europe lay the groundwork for the re-birth of Europe (Renaissance)? What conditions existed that allowed Europe to evolve out of medieval conditions? I don't even know where to start, other than that I know that monarchs began to solidify

67. ## chemistry

IF WE HAVE TWO SUBESTANCE(A/B)THE MELTING POINT A IS 125 AND FOR B THE M.P IS UNKNOWN,HOW COULD KNOW WE WITH HERE A/B ARE THE SAME SUB.OR DIFFRENT

68. ## science

if you have a 343 J of kinetic energy at the lowest point of a pendulum's swing and at the highest point has a height of 5 m what is the pendulum's mass

69. ## Chem Honors

at what temperature will nitrogen gas have a density of 1.13 grams/meters at a pressure of 1.09 ATM

70. ## chemistry

IF WE HAVE TWO SUBESTANCE(A/B)THE MELTING POINT A IS 125 AND FOR B THE M.P IS UNKNOWN,HOW COULD KNOW WE WITH HERE A/B ARE THE SAME SUB.OR DIFFRENT

71. ## physics

while watching ocean waves at the dock of the bay. otis notices that 10 waves pass beneath him in 30 seconds. he also notices that the crests of succesive waves exactly coincide with the posts that are 5 meters apart. what are the period frequency

72. ## chemistry

oil and water are immiscible. what does this mean? explain in terms of the structural features of their respected molecules and the forces between them.

73. ## Com155Wk8

Read the second paragraph of the synthesis passage. It may be found on pp. 38 & 39. Using your reading for the week and this paragraph in particular, answer the following questions. What is the key objective when writing a paragraph on synthesis? Do you

74. ## Chemistry

If the column of water in the water barometer fore to a height of 35ft, what would the atmospheric pressure be in mm Hg? mmH20X(density of water/density of Hg)= mmHg Density of water=0.99707 Density Hg=13.5340

75. ## Statistics

The lower the values of alpha - would cause exponential smoothing to respond the most slowly to forecast errors?

76. ## environmental science

How many deaths occur due to water borne disease in countries with chlorinated water systems? I have been trying to find this statistic. Can someone please give me a reference. Thank you

77. ## algebra

determine if (-3/10,-2 is a solution to 10x,-9 =15

78. ## physics

what is the kinetic energy of a 200 g bullet travelling at a velocity of 400 m/s?

79. ## chemistry

A student found that her mixture was 15% NH4Cl, 20% NaCl, and 75% SiO2. Assuming her calculations are correct, what is the most likely source or error in her experiment?

80. ## Management of information systems

Information systems cannot solve every business challenge. Identify 2-3 business issues and provide an explanation of why technology cannot be used to aid or solve them.

81. ## physic

The resistance of a copper wire of diameter 10mm and length 2m is 15 Ω. Determine the new resistance if i) the length is doubled and the diameter halved ii) the length increases by three fold and the diameter doubled iii) the length decreases by two fold

82. ## Chemistry

Answer the following question A(g) B (g) + C(g) Kp = 2.00 Assume you placed 1.0 mole each of 'A' , 'B' , and 'C' in a container. Without actually doing the calculations explain how you would determine whether or not the system is at equilibrium, and if not

83. ## math

Evaluate the function f(x) = -x2 + 5 for x = 4

84. ## english

Wouldn't have reached as many people, and they wouldn't have been able to respond as quickly to criticism from the states-rights side of the debate.

HA(aq)+ H2O (l) H3O+(aq)+ A¯ (aq) Given the reaction above, which of the following will cause an increase in the pH of an equilibrium mixture? Give all answers which apply. A) add KA B) add HA C) remove A¯ D) remove HA E) none of these will affect the

86. ## Chemistry

Which of the following forms a solid with non-directional covalent bonds? A) neon B) chlorine C) copper D) carbon E) selenium

87. ## math

The floor tile is one square foot. The kitchen floor was covered with 100 floor tiles. What was the area of the kitchen floor in square inches?

88. ## physics

Which type of wave would be beneficial to a surfer?

89. ## physics

metal sphere has a charge of +10C. What is the net charge after 5.1 x 1013 electrons have been placed on it?

90. ## Chemistry

calculate the enthalpy change in delta H foor heating 250 grams of liquid water from 0 degrees celcius to 100 degrees celcius.

a 27 g arrow is shot horizontally. the bowstring exerts an average force of 75 N on the arrow over a distance of 78 cm. detrmine the speed of the arrow as it leaves the bow.

92. ## Physics II

Two charges, Q1= 3.20 microCoulombs, and Q2=5.90 microCoulombs, are located at points (0,-2.00cm) and (0,+2.00cm. What is the magnitude of the electric field at point P, located at (5.00cm,0), due to Q1 alone?

93. ## Diffeq

d/dx (x)(e^xy)(cos2x). Product rule lets me take the derivative of f(x)g(x). But three functions?

94. ## geometry

a field bounded on one side by a river is to be fenced on three sides to form a rectangular enclosure. there are 320 ft of fencing available. what should the dimensions be to have an enclosure with the maximum possible area?

4 each of examples identify financial decision you have made or might have to make in the future. In the last column, tell what effect this decision may have on ur personal resources. (Personal resources include things such as money, time and health.)

96. ## math

what is the product of 8 and 1

97. ## Anthropology

Use modern advertisements to show examples of gender roles and how they are changing. pls. answer by 7:00 a.m. Eastern time.

98. ## algebra

factor: 6x^2-13x+6

99. ## algebra

rational expression 2y+1 y^2-y-6

100. ## Physics

A force of gravity pulls downward on a book on a table what force prevents the book from accelerating downward?

a^2 15a^3

102. ## geometry

Given ABCD is a square AC = BD = 4 units Find coordinates of ABCD

103. ## physical science

the influence of the magnitude of the surface area on the rate of reaction of a specific reaction using rennies tables

104. ## Geometry

Given ABCD is a square AC= BD = 4 units Ac= BD pass origin of (0,0) Find coordinates of A B C D

105. ## math

evaluate 2/(ã1+ã2) + 2/(ã2+ã3) + 2/(ã3+ã4)... + 2/(ã8+ã9)

106. ## math

Choi deposited \$2500 in a savings account that pays 4.75% interest compounded quarterly. What will be the total amount of money in the account 15 years from the day of deposit?

107. ## geometry

how many one-centimeters squares fit inside a square that has an area of 9 square meters?

108. ## physics

A block of mass m is dropped from the fourth floor of an office building and hits the sidewalk below at speed v. From what floor should the mass be dropped to double that impact speed?

109. ## chemistry

explain why you get two different pH values for same solution when calculating and using pH meter of same solution?

110. ## physics

How can you change the temperature of two objects to reach equilibrium

111. ## geometry

the legs of a right angled triangle are 5 cm and 12cm long. find the lengths, to the tenth, of the segment into which the bisector of the right angle divides the hypotenuse.

112. ## Calculus

find the volume of the solid formed by rotating the region enclosed by y=e^(1x+4), y=0, x=0, x=0.9

113. ## Amazon Information

Amaazon opened up reviews on their site. What advantage/profit do rev iews bring to the business? Is is that it reassures others to go purchase the product or somthing?

114. ## Physics 2 Charges what is the magnitude at point P

Two charges, Q1= 3.20 microCoulombs, and Q2=5.90 microCoulombs, are located at points (0,-2.00cm) and (0,+2.00cm. What is the magnitude of the electric field at point P, located at (5.00cm,0), due to Q1 alone?

115. ## American Goverment

IRS Federal Agency. List the URL address. Considering the informatioin on the website, briefly describe the mission of the agency. What policy choices might bureaucrats from the agency advocate in order to expand the activities that fit their mission?

116. ## pre-algebra

the length of a rectangle is 10 inches more than its width. what are the dimensions of the rectangle if its perimeter is 80 inches?

117. ## chemistry

I have a lot of trouble doing this chemistry exercise It says: The altitude of the lake affects the solubility of oxygen in lakes high in the alps. if the solubility of O2 from the air is 7.89 mg/L M at sea level and 25C, what is the solubility of O2 in

118. ## algebra

I need help with this one. Simplify 768u^8z^8/36u^2z^3

119. ## Physics

A small bead of mass m is free to slide along a long, thin rod without any friction. The rod rotates in a horizontal plane about a vertical axis passing through its end at a constant rate of f revolutions per second. Show that the displacement of the bead

120. ## Spanish

28. ¿Vas a estudiar ahora para la clase de español o para ____ de ciencias? a. uno b. el c. la d. una C? or B.. 29. Me duele la cabeza. Creo que ______. a. necesitamos otro dentista b. debo quedarme en la cama c. busco otro médico d. me siento mejor B?

121. ## Physics

A uniform plank of length L leans against a vertical wall, its head a distance h above the horizontal ground. If we let go of the plank from rest, how far above the ground is the head of the plank the moment it loses contact with the wall?

122. ## hcs/335

What is the mission statement of your organization? How is this mission evidenced through the actions of the employees and in the culture of the organization?

123. ## physics

What is the force of gravity between two spheres that have a mass of 6 kg and are separated by 36 m?

124. ## physics

What is the force of gravity between two spheres that have a mass of m1 =13 kg, m2 = 49 kg and are separated by 35 m?

125. ## physics

A planet with a mass of 5.67E25 kg has a radius of 3.63E7 m. How much would a 89 kg person weigh on this planet if they were standing on the surface?

126. ## physics

Two stars, a binary star system, with a mass of m1 = 5.88E29 and m2 = 2.27E30 kg are separated by a distance of 2.55E11 m. What is the gravitational force between them?

127. ## Biochemistery

how could a test to determine if inhibition was competitive or noncompetitive

128. ## physics

if first man has a force of 500n what is in the second. if acceleration is 2m/s^2 what should be the force of the two to maintain the acceleration.

129. ## biochemistery

What are the different forms of RNA? what are their functions in the body?

130. ## Biology

(purple smooth = 75, white smooth = 28, purple wrinkled = 24, white wrinkled = 8) Account for the difference between the expected and experimental values.

131. ## science

if the ear canal is blocked by wax why would this caues deafness

132. ## math

The shape of the shell resembles a cone with an approximate diameter of 21 mm and an approximate height of 38 mm. What is the approximate volume of the shell? (Use 3.14 for .)

133. ## math

What is the range of the relation? {(1, 2), (2, 4), (3, 2), (4, 6)} I'm pretty sure it is {2, 4, 6).

134. ## Physics

You are an artillery offcer attached to Gaius Julius Caesar's Xth Legion in the Gallic War (1st C. BCE). You are responsible for a catapult, a device with a long spoonlike arm used to lob stones or pumpkins over the walls of Gallic oppida. These fortresses

135. ## English

Do commas go in parentheses as in the sentence "asking my friends to go to the restaurant (and bring food home), I called Jenna."

136. ## science

Calculate the specific volume of an air-vapour mixture when the temp=30 degree Celsius, Mw=0.015 kg/kg, Pt=90kpa

137. ## Physics

A current of 1.03 A flows in a wire. How many electrons are flowing past any point in the wire per second? The charge on one electron is 1.60 10-19 C

138. ## physics

A major-league pitcher can throw a baseball in excess of 44.6 m/s. If a ball is thrown horizontally at this speed, how much will it drop by the time it reaches the catcher who is 17.7 m away from the point of release?

139. ## Calculus

What is the 4 step process when finding the slope of the tangent line at any given point?

140. ## Calculus

Find the derivative of the function f by using the rules of differentiation. f(x) = 360

141. ## math

factor out the greatest common factor from the expression 15x^5-9x^4

142. ## algebra

If they maintain there speed, how far from each other will they be ... north at 2.5 mph and Josh walking east at 3 mph, how long will they meet

143. ## algebra

Thee area of the rectangle athletic field represented by the expressio 25y^2-4z^2 square meters. Write an algebriac expression to represent one possible set of dimensions(in the sense''length times width'')of the athletic field. include units with the

144. ## Algebra

In 1995, the life expectancy of males in a certain country was 64.8 years. In 1999, it was 67.2 years. Let E represent the life ecpectancy in year t and let t represent the number of years since 1995. E(t)= t+ (round to nearest tenth Use the function to

HA(aq)+ H2O (l) H3O+(aq)+ A¯ (aq) Given the reaction above, which of the following will cause an increase in the pH of an equilibrium mixture? Give all answers which apply. A) add KA B) add HA C) remove A¯ D) remove HA E) none of these will affect the

146. ## Spanish

7. "Alberto prefiere sacudir los muebles." "Creo que no. Prefiere pasar la aspiradora." "Creo que Uds. _______." a. tiene razón b. están de acuerdo c. no están de acuerdo d. no tiene razón A? But I think it could also b C...

147. ## math

Andrew factored the expression 54x^3-30x^2+15x as 5x(9x^2-6x+3) but when Melissa applied the distributive law and multiplied out 5x(9x^2-6x+3). she got 45x^3-30x^2+15x. thus andrew's solution does not appear to check. why is this? eplain your reasoning and

148. ## Science

a truck that weighs 19500 kg is moving at a velocity of 17 m/s west what is the trucks momentum? My answer: 1147.05...

149. ## Calculus

Find the derivative of the function f by using the rules of differentiation. f(x) = (10 x^3 + 3 x^2 + 5 x - 7)/x

150. ## science

If air at 30 degree c Dry Bulb temp and water vapour content(Mw)=0.015kg/kg flows over a basin containing water at 10 degree C. a) what will happen to the air temp? b) what will happen to the moisture content in the air? c) what will happen to the enthalpy

151. ## algebra

The area of a rectangle athletic field is represented by the expression 12y^3+48^2+24y sqaure meters. write an algebraic expression to represent one possible set of dimensions (in the same sense ''length times width'') of the athletic field. include the

152. ## math

factor the following expression completely 75x^4+35x^3-10x^2

153. ## chem

Calculate the pH after 0.12 mol of NaOH is added to 1.00 L of 0.60 M HF and 1.06 M KF

154. ## Vocabulary- check my answer

The shirt that Jack stole was worth just three dollars, so he was only charged with a _________.

155. ## Physics

Engineers are trying to create artificial "gravity" in a ringshaped space station by spinning it like a centrifuge. The ring is 170 m in radius. How quickly must the space station turn in order to give the astronauts inside it apparent weights equal to

156. ## algebra

The area of a rectangle athletic field is represented by the expression 12y^3+48y^2+24y sqaure meters. write an algebraic expression to represent one possible set of dimensions (in the same sense ''length times width'') of the athletic field. include the

157. ## Vocabulary- check my answer

The shirt that Jack stole was worth just three dollars, so he was only charged with a _________. a) ruffian b)misdemeanor.... Is this right??? c)extortion d)condemnation PLEASE HELP

158. ## Math

Your friend is taking an algebra class that began after ours. Write your friend an email explaining a general strategy for factoring in a very organized way.

159. ## math

find general solution in implicit form of differential equation dy/dx= 2(e^x-e^-x)/y^2(e^x+e^-x)^4 (y>0)

160. ## Math & Stats

Please help I was up till 2am trying to figure this out last night, Thanks The top selling Red and Voss is rated 70,000 miles, which means nothing. In fact, the distance the tires can run until they wear out is a normally distributed random variable with a

161. ## accounting

V P3-10. Calculating Present Value of a Savings Fund. (Obj. 5) Hal Thomas wants to establish a savings fund from which a community organization could draw \$850 a year for 45 years. If the account earns 6 percent, Hal will have to deposit \$ now to achieve

162. ## physics

Q1 and Q2, when separated by a distance of 2 m, experience a force of repulsion eqaul to 1.8 N.(a) What will the force of repulsion be when they are 10 m apart? (b) if the ratio Q1/Q2 = 1/2, find Q1 and Q2 ( r = 10m)

163. ## chemistry lab

what happens to Br-,SO42- and CO32- anions when its sodium salt is treated with (1) NH3 and BaCl2 and (2) HNO3 and AgNO3 solutions. Give the formulas of the products formed.

164. ## b

what means esophagus

165. ## physics

A pendulum clock has a heavy bob supported on a very thin steel rod that is 1.00000 m long at 18.0celcius. 1 - what is the clock's period if the temperature increases by 11.0 celcius? Assume that coefficient of linear expansion of steel is 1.20×10−5K

166. ## Statistics

Is this right? and how can I break it down if needed? A factory’s worker productivity is normally distributed. One worker produces an average of 75 units per day with a standard deviation of 20. Another worker produces at an average rate of 65 per day

167. ## English

Please write this. Write simile for Valentine's?I give mine teacher.Be nice!

168. ## Chemistry

A square of aluminum foil measuring 3.20 inches on each side weighs 275 mg. The density of aluminum is 2.70 g/cm3. Find the thickness (in micrometers) of the foil.

169. ## calculus

f(x)=3-5x , (-1,8) find the slope of the tangent line to the graph of the function at the given point

170. ## statistics

the correlation between two random variables X and Y is p=-0.75.it is given that X=1,2or3 with equal probability of 1/3 and Y=-1,-2or-3 with equal probability of 1/3.the covariance is equal to?i need help.i have been struggling to get the answer>

can someone help me with some information on each one of this. Employee Receives Either Rewards or Punishments Employee Identifies Need Employee searches for ways to satisfy these needs Employee Reassess Need Deficiencies Employee Performs Employee Selects

172. ## calculus

how did you figure that out

173. ## Economics

How would a communist economy react to social and technological changes? What is the role of nature in a communist economy? I can't find any information on these subjects. Could someone please help me? Thanks so much

174. ## physics

How much work is required to lift a 600-kg satellite to an altitude of 4 * 10^6 m above the surface of the earth? The gravitational force is F=GMm/r^2, where M is the mass of earth, m is the mass of the satellite, r is the distance between them. The radius

175. ## Math/Trig

Write a polynomial of the smallest degree with roots 1, -3, and 4.

176. ## Science

What is the defenition of the word dissolve?

177. ## algebra

Andrew factored the expression 54x^3-30x^2+15x as 5x(9x^2-6x+3) but when Melissa applied the distributive law and multiplied out 5x(9x^2-6x+3). she got 45x^3-30x^2+15x. thus andrew's solution does not appear to check. why is this? eplain your reasoning and

178. ## physics

A person pulls a toboggan for a distance of 20.0 m along the snow with a rope directed 30.0° above the snow. The tension in the rope is 67.0 N.

179. ## Organic Chemistry

Why doesn't liquid CO2 decaffinate coffee and super critical CO2 does?

180. ## math

You win \$4 if you flip a coin twice and get tails both times. For any other outcome you get nothing. What is the expected value?

181. ## math

f(x)=2-9x find f^-1(6)

182. ## Math

I'm stuck on solving this one. If I could get some help please. -6 le x/2 - 4 lt -3

I am suppose to explain how the moment magnitude and Richter scales of earthquake measurement are similar and how they are different. Can you tell me if I am correct? They are alike because they always come up with the same rating for an earthquake. They

184. ## algebra

factor completely 75x^4+35x^3-10x^2

185. ## Calculus

A chain 27 feet long whose weight is 74 pounds is hanging over the edge of a tall building and does not touch the ground. How much work is required to lift the entire chain to the top of the building?

186. ## Minds at work

A person that has a sevre overreation to an intense emotion might be experiencing a a. galvanic skin response b. sympathetic rebound c. suppressed emotion d. parasympathetic rebound if you relearn a song that you heard as a child, your savings score for

187. ## Gen 105

Gen 105 wk 2 using the proper tone

188. ## groundwater science

For one dimensional flow, what is the flow rate in a 2.0-m long sample of clean saturated sand having a cross-sectional area of 0.05 m2, and a hydraulic conductivity value of 10-3 m/s, if the drop in head over the length of the sand sample is 0.03 m?

189. ## chem

Calculate the pH after 0.12 mol of NaOH is added to 1.00 L of 0.60 M HF and 1.06 M KF

190. ## algebra

the volume of a cylinder is represented by the polynomial 2pier^3 + 12piex^2 + 18piex. find the expression for the radius and the expression for the height in terms of x

191. ## social studies

how do a reserch papaer on marian anderson

192. ## Physics

A ball traveling in a circle with a constant speed of 8 m/s has a centripetal acceleration of 5 m.s^. What is the radius of the circle?

193. ## algebra

Patty is only 7 years old, but she insists she can play basketball with a regulation-height hoop. She can throw the ball with an initial velocity of 11 feet per second. The equation for the height of the ball is y = −16t2 + vt + s where v is the initial

194. ## art101

1. CheckPoint: Greek and Roman Architecture • Resource: Ch. 15 of A World of Art • Write a summary comparing the characteristics and innovations of each Greek and Roman architecture in 200 to 300 words. • Provide two representative examples of

195. ## Basic math

Compute. 3/2 - 4 1/3 The answer I got was 4 2/1.

196. ## Spanish

20. Es viernes. Vamos a mi casa para ver E.T. en ______. a. mi videocasetera b. el cine c. el equipo de sonido d. mis fotos A? 21. Nuestro apartamentos es ________. a. grande y cómoda b. grande pero incómoda c. pequeña e incómoda d. pequeña pero

197. ## Physics

At a height of 15 meters above the surface of a lake, a sound pulse is generated. The echo from the bottom of the lake returns to the point of origin 0.150 s later. The air and water temperatures are 20°C. How deep is the lake?

198. ## algebra

x + 2 over 13 = 7 over 13 what is x

I fire a tennis ball from an air cannon, straight up from ground level, at initial speed v0. At the instant it reaches the top of its trajectory, I fire a second tennis ball at the same initial speed. Air resistance is negligible. At what fraction of the

A 30.0 kg child slides down a long slide in a playground. She starts from rest at a height h1 of 18.00 m. When she is partway down the slide, at a height h2 of 9.00 m, she is moving at a speed of 9.30 m/s. Calculate the mechanical energy lost due to

Two cars are drag racing, starting from rest at t = 0, on a straight and level road. Team Alpha's car produces acceleration ax = alpha t^(-1/2) ; while Team Beta's car produces acceleration ax = Beta ; for all t > 0, where alpha and beta are positive

202. ## geometry

What Is The Area Of A Circle If The Radius Is 10 Inches?

A 86.0 kg diver falls from rest into a swimming pool from a height of 6.30 m. It takes 1.86 s for the diver to stop after entering the water. Find the magnitude of the average force exerted on the diver during that time.

204. ## math

how do you find the equation line of these ordered pairs (1/6, -1/3) and (5/6, 5)?

205. ## pre calc

find f(x) and g(x) such that h(x)= (fog)(x) h(x)= 1/sqrt3+7

206. ## Physics

You are an artillery offcer attached to Gaius Julius Caesar's Xth Legion in the Gallic War (1st C. BCE). You are responsible for a catapult, a device with a long spoonlike arm used to lob stones or pumpkins over the walls of Gallic oppida. These fortresses

207. ## physics

An airplane has a velocity relative to the air of 181 m/s in a westerly direction. If the wind has a speed relative to the ground of 53 m/s directed to the north, what is the speed of the plane relative to the ground?

208. ## english

Using the topic of home ownership versus leasing, identify a topic and provide a topic sentence you would use in a paragraph about the topic.

209. ## Math

Integrate (sin^2(t)+1)/(cos^4(t))dt

210. ## calculus

Please help. i am confused on how to do this one. I keep getting arcsin(square root -cos9x) but it is wrong. The probem is F(x)= arcsin(sqtsin(9x))

211. ## Chemistry

When copper wire is placed into a silver nitrate solution, silver crystals and copper(II) nitrate solution form. If 57.1 g silver is actually recovered from the reaction, determine the percent yield of the reaction.

212. ## Chemistry

Answer the following question A(g) B g) + C(g) Kp = 2.00 Assume you placed 1.0 mole each of 'A' , 'B' , and 'C' in a container. Without actually doing the calculations explain how you would determine whether or not the system is at equilibrium, and if not

213. ## Chemistry

Reactions can be speeded by increasing the proportion of reactant molecules which collide with proper orientation. This can be accomplished by . . . A) compressing the reactant mixture. B) heating the reactant mixture. C) addition of a catalyst. D) cooling