# Cooper

Popular questions and responses by Cooper
1. ## Physics

Four point charges are located at the corners of a square with sides of length a . Two of the charges are +q, and two are -q. Find the magnitude of the net electric force exerted on a charge +Q, located at the center of the square, for the following

2. ## Physics

A +5.0 uC charge experiences a 0.44 N force in the positive y direction. If this charge is replaced with a -2.7 uC charge, what force will it experience?

3. ## math

Max is making trail mix. He combines 2/5 pound of dried fruit and 1/3 pound if mixed nuts. He adds sunflower seeds to make a total of 1 pound. What is the weight of the seeds?

4. ## Algebra

The height, in meters, of a projectile can be modeled by h= -4.9t^2 + vt + s where t is the time (in seconds) the object has been in the air, v is the initial velocity (in meters per seconds) and s is the initial height (in meters). A soccer ball is kicked

5. ## Physics

A communications satellite with a mass of 450 kg is in a circular orbit about the Earth. The radius of the orbit is 2.9×10^4 km as measured from the center of the Earth. Calculate the weight of the satellite on the surface of the Earth Calculate the

6. ## chemistry

Consider the reaction, C2H4(g) + H2(g) ® C2H6(g), where DH = – 137 kJ. How many kilojoules are released when 55.3 g of C2H4 reacts?

7. ## science

The number of protons, neutrons and electrons, respectively, in 115Cd2+ are?

8. ## physics

You want to nail a 1.5 kg board onto the wall of a barn. To position the board before nailing, you push it against the wall with a horizontal force F to keep it from sliding to the ground. (a) If the coefficient of static friction between the board and the

9. ## physics

Two point charges, the first with a charge of +3.19×10^−6 C and the second with a charge of -4.32×10^−6 C , are separated by 28.0 cm. Find the magnitude of the electrostatic force experienced by the positive charge. Is the magnitude of the force

10. ## science

The number of protons, neutrons and electrons, respectively, in 115Cd2+ are?

11. ## Physics

A football is kicked at an angle of 60 degrees above the horizontal. To make the field goal it must reach a height of at least 3.048 m above the ground. What is the minimum speed the ball can be kick in order make a field goal?

12. ## CHEM

A 0.552 g sample of ascorbic acid(Vitamin C) was dissolved in water to a total volume of 20.0 ml and titrated with 0.1103 M KOH. The equivalence point occurred at 28.42 ml. The pH of the solution at 10.0 ml of added base was 3.72. From this data, determine

13. ## Physics

A vibrating structural beam in a spacecraft can cause problems if the frequency of vibration is fairly high. Even if the amplitude of vibration is only a fraction of a millimeter, the acceleration of the beam can be several times greater than the

14. ## Algebra 1

Describe a real-world situation that each expression might model. Tell what each variable represents. 14. 40

15. ## physics

3) A football is kicked at an angle of 60 degrees above the horizontal. To make the field goal it must reach a height of at least 3.048 m above the ground. What is the minimum speed the ball can be kick in order make a field goal?

16. ## Physics

The electric flux through each of the six sides of a rectangular box are as follows: phi 1= +150.0 N*m^2/C; phi 2= +250.0 N*m^2/C; phi 3= -350.0 N*m^2/C; phi 4= +175.0 N*m^2/C; phi 5= -100.0 N*m^2/C; phi 6= +450.0 N*m^2/C How much charge is in this box?

17. ## Physics

An object with a charge of -4.4 uC and a mass of 1.4×10^−2 kg experiences an upward electric force, due to a uniform electric field, equal in magnitude to its weight. Find the magnitude of the electric field. Find the direction of the electric field. If

18. ## Physics

Write an expression for a transverse harmonic wave that has a wavelength of 2.8 m and propagates to the right with a speed of 14.2 m/s. The amplitude of the wave is 0.13 m, and its displacement at t=0 and x=0 is 0.13 m.

19. ## Physics

A ball rolls on a circular track of radius 0.65 m with a constant angular speed of 1.2 rad/s in the counterclockwise direction. Part A If the angular position of the ball at t= 0 is theta= 0, find the x component of the ball's position at the time 2.6 s.

20. ## Physics

An equilateral triangle 10.0 m on a side has a 1.00-kg mass at one corner, a 2.00-kg mass at another corner, and a 3.00-kg mass at the third corner. Find the magnitude of the net force acting on the 1.00 kg- mass. Find the direction of the net force acting

21. ## Physics

Suppose one of the Global Positioning System satellites has a speed of 4.50 km/s at perigee and a speed of 3.52 km/s at apogee. If the distance from the center of the Earth to the satellite at perigee is 2.21×104 km, what is the corresponding distance at

22. ## Physics

A 1.25 kg skateboard is coasting along the pavement at a speed of 5.04 m/s when a 0.640 kg cat drops from a tree vertically downward onto the skateboard. What is the speed of the skateboard-cat combination? Answer in units of m/s Your answer must be within

23. ## Physics

A mass attached to a spring oscillates with a period of 3.15 s. If the mass starts from rest at x= 4.10×10−2 m and time t= 0, where is it at time t= 6.37s? Is the mass moving in the positive or negative x direction at t= 6.37s?

24. ## Physics

Two people with a combined mass of 135 kg hop into an old car with worn-out shock absorbers. This causes the springs to compress by 9.80 cm. When the car hits a bump in the road, it oscillates up and down with a period of 1.76 s. Find the total load

25. ## Physics

Suppose a planet is discovered orbiting a distant star with 13 times the mass of the Earth and 1/13 its radius. How does the escape speed on this planet compare with that of the Earth? Ve new ------- = ve earth

26. ## Physics

A baseball bat balances 61.1 cm from one end. If a 0.600 kg glove is attached to that end, the balance point moves 22.7 cm toward the glove. Find the mass of the bat.

27. ## Law

'How do the media influence public perceptions about the law and its administration? How might public pressure impact legislators and judges in establishing the law?' would greatly appreciate a paragraph, A+ worth answer, struggling with this question.

28. ## Alex

Express x^3-4/x^2(x+2) into partial fractions

29. ## Math

Define a#b=ab-a-b+1 for all real numbers a and b. x # 7 = 42. What is the value of x?

30. ## math

f(x)=x2−1, g(x)=2x+2, then (fg)(x)= x2−12x+2, x≠1 so is this correct

31. ## math

f(x)=1x, g(x)=1x, then (f∘g)(x)

32. ## Chemistry

What mass of sodium benzoate should you add to 150.00 ml of a 0.15M benzoic acid solution to obtain a buffer with a pH of 4.25?

33. ## Chemistry

Calculate the ratio of NaF to HF required to create a buffer with a pH of 4.00.

34. ## Pre-Calculus

Sketch the graph f(x)=-2x^2(x-5)^3(x+2)^4. What would be my coordinates. I solved it and my graph looks nothing like the one on wolframalpha. Can someone show me how you would solve this?

35. ## Pre-Calculus

Sketch the graph f(x)=-2x^2(x-5)^3(x+2)^4. What would be my coordinates. I solved it and my graph looks nothing like the one on wolframalpha. Can someone show me how you would solve this?

36. ## Pre-Calculus

Find a polynomial function with integer coefficients with degree 4, one root 3+radical2, and another root 4-3i. I got x^4-14x^3+80x^2-206x+175 I'm I correct?

37. ## math

If there were only cats and dogs at the pound and the ratio of cats to dogs was 3:4 if there were 105 cats, how many animals altogether?

38. ## Physics

A parallel-plate capacitor is constructed with circular plates of radius 0.056 m. The plates are separated by 0.25 mm, and the space between the plates is filled with dielectric with dielectric constant k. When the charge on the capacitor is 1.2 uc the

39. ## Physics

A uniform electric field of magnitude 2.70×10^4 N/C makes an angle of 37 degrees with a plane surface of area 1.60×10^−2 m^2 . What is the electric flux through this surface?

40. ## Physics

The electric field at the point x=5.00 cm and y=0 points in the positive x direction with a magnitude of 10.0 N/C. At the point x=10.0 cm and the electric field points in the positive x direction with a magnitude of 16.0 N/C . Assume this electric field is

41. ## physics electricity & magnetism

Charge Q=4 micro-coulombs is distributed uniformly over the volume of an insulating sphere of radius R=.05 meters. What is the potential difference between the center of the sphere and the surface of the sphere? How do I approach this problem? I tried

42. ## Physics

Two ships in a heavy fog are blowing their horns, both of which produce sound with a frequency of 165.0 Hz One ship is at rest; the other moves on a straight line that passes through the one at rest. If people on the stationary ship hear a beat frequency

43. ## Physics

A pair of in-phase stereo speakers is placed side by side, 0.85 m apart. You stand directly in front of one of the speakers, 1.2 m from the speaker. What is the lowest frequency that will produce constructive interference at your location?

44. ## Physics

A motorcycle and a police car are moving toward one another. The police car emits sound with a frequency of 512 Hz and has a speed of 28.0 m/s. The motorcycle has a speed of 13.0 m/s. What frequency does the motorcyclist hear?

45. ## Physics

A bunch of grapes is placed in a spring scale at a supermarket. The grapes oscillate up and down with a period of 0.41 s, and the spring in the scale has a force constant of 640 N/m. What is the mass of the grapes? What is the weight of the grapes?

46. ## Physics

When a 0.213-kg mass is attached to a vertical spring, it causes the spring to stretch a distance d. If the mass is now displaced slightly from equilibrium, it is found to make 150 oscillations in 52.0 s. Find the stretch distance, d.

47. ## Physics

A 0.55-kg air cart is attached to a spring and allowed to oscillate. If the displacement of the air cart from equilibrium is x=(10.0 cm)cos[(2.00 s ^-1)t + pi], find the maximum kinetic energy of the cart. Find the maximum force exerted on it by the

48. ## Physics

The position of a mass oscillating on a spring is given by x=(4.7 cm)cos [2pi t/(0.52 s)]. What is the period of this motion? What is the first time the mass is at the position x=0?

49. ## Physics

Your heart beats with a frequency of 1.35 Hz. How many beats occur in a minute? If the frequency of your heartbeat increases, will the number of beats in a minute increase, decrease, or stay the same? How many beats occur in a minute if the frequency

50. ## Physics

An equilateral triangle 10.0 m on a side has a 1.00-kg mass at one corner, a 2.00-kg mass at another corner, and a 3.00-kg mass at the third corner. Find the magnitude of the net force acting on the 1.00 kg- mass. Find the direction of the net force acting

51. ## Physics

An astronaut exploring a distant solar system lands on an unnamed planet with a radius of 3800 km. When the astronaut jumps upward with an initial speed of 4.00 m/s , she rises to a height of 0.600 m. What is the mass of the planet?

52. ## Physics

Two 0.53-g basketballs, each with a radius of 17 cm, are just touching. How much energy is required to change the separation between the centers of the basketballs to 1.1 m? (Ignore any other gravitational interactions.) How much energy is required to

53. ## Physics

The largest moon in the solar system is Ganymede, a moon of Jupiter. Ganymede orbits at a distance of 1.07 X 10^9 m from the center of Jupiter with an orbital period of about 6.18 X 10^5 s. Using this information, find the mass of Jupiter.

54. ## Physics

Gravity on Titan Titan is the largest moon of Saturn and the only moon in the solar system known to have a substantial atmosphere. Find the acceleration due to gravity on Titan's surface, given that its mass is 1.35 X 10^23 kg and its radius is 2570 km.

55. ## Physics

When the Earth, Moon, and Sun form a right triangle, with the Moon located at the right angle, the Moon is in its third-quarter phase. Find the magnitude of the net force exerted on the Sun. Find the direction of the net force exerted on the Sun. Give the

56. ## Physics

In each hand you hold a 0.15 kg apple. What is the gravitational force exerted by each apple on the other when their separation is 0.25 m? What is the gravitational force exerted by each apple on the other when their separation is 0.50 m?

57. ## Physics

A torque of 0.13 N*m is applied to an egg beater. If the egg beater starts at rest, what is its angular momentum after 0.50 s?

58. ## Physics

You pull downward with a force of 32 N on a rope that passes over a disk-shaped pulley of mass 1.3 kg and radius 0.075 m. The other end of the rope is attached to a 0.60 kg mass. Find the linear acceleration of the 0.60 kg mass.

59. ## Physics

A uniform metal rod, with a mass of 3.0 kg and a length of 1.0 m, is attached to a wall by a hinge at its base. A horizontal wire bolted to the wall 0.64 m above the base of the rod holds the rod at an angle of 40 degrees above the horizontal. The wire is

60. ## Physics

A set of fossilized triceratops footprints discovered in Texas show that the front and rear feet were 3.2 m apart. The rear footprints were observed to be twice as deep as the front footprints. Assuming that the rear feet pressed down on the ground with

61. ## Physics

A fish takes the bait and pulls on the line with a force of 2.2 N. The fishing reel, which has a friction clutch that exerts a restraining torque of 0.048 N m, is a cylinder of radius 0.055 m and mass 0.84 kg. Part A What is the angular acceleration of the

62. ## math

napoleon 1 was born in 1769 how old was he when he was crowned in france 1804 {equation]

63. ## reserch

what changes would you half to make to a human being phisical features if it were to live in an enviroment with a temprature over 50c every day.

64. ## chemistry

A 204.2 g sample of a mixture contains 22.3% sodium chloride. What mass (g) of sodium chloride is present in the sample

65. ## Math

How many ways can 6 cars line up is it 6 X 6 is it 6 squared?

66. ## chemistry

An 8.00-gram sampleyields 1.64grams of Zinc when the compound is decomposed. What is the compound?

67. ## chemistry

HNO3 (g) + 4H2 (g) ---> NH3 (g) + 3H2O (g) deltaH = -637 kJ Calculate the enthalpy change when one mole of hydrogen reacts; and What is the enthalpy change when 10.00 g of ammonia is made to react with excess of steam to form nitric acid and hydrogen

68. ## chemistry

HNO3 (g) + 4H2 (g) „³ NH3 (g) + 3H2O (g)deltaH = -637 kJ Calculate the enthalpy change when one mole of hydrogen reacts and What is the enthalpy change when 10.00 g of ammonia is made to react with excess of steam to form nitric acid and hydrogen gases?

69. ## Physics.

I posted at around 7:44 please help me, everytime I post, no one ever helps me, or it is too late...I only ever want physics help...so please, lend a helping brain! :) (Im not trying to come off mean, Im just frustrated beyond belief)

A ball is kicked toward Ryan with an initial velocity of 21.0 m.s at an angle of 41 degrees above the horizontal. At that instant, Ryan is 51.0m from the kicker. In what direction, and with what constant velocity, should Ryan run in order to catch the ball

71. ## math

at the beginning of the year, allison and sean togethor had 24 papergack books. during the year,allison doubled her supply but sean lost three of his. togethor they had 46 books at the end of the year. how many books did each have at the beginning of the

1. ## litracy

stop talking bout spelling and give us the answer

posted on August 27, 2020
2. ## math

the answers on my test say 23.6, 24.6, 27.6 or 39.6 so idk what to put as my answer.

posted on February 28, 2020
3. ## Math

Anon is right thanks Anon!

posted on September 27, 2019
4. ## Math

The answers to the quiz is C B A D B

posted on September 27, 2019
5. ## Math

Translate this phrase into an algebraic expression. imma kill

posted on April 18, 2018
6. ## Math

Translate this phrase into an algebraic expression.

posted on April 18, 2018
7. ## Law

posted on March 10, 2018
8. ## Chemistry

In the reaction between bromine and sodium, a bromine atom gains an electron and forms the bromide ion, Br–. What happens to bromine?

posted on December 1, 2016
9. ## math

16 3/16

posted on October 6, 2016
10. ## Chemistry

ssfosineofnoifjos

posted on September 15, 2016
11. ## math

Shouldn't it be 12.5?

posted on May 17, 2016
12. ## SS

I think the answer is Ethnic Differences.

posted on May 17, 2016
13. ## Algebra

Thanks!

posted on May 16, 2016
14. ## physics

posted on February 9, 2016
15. ## math

cuz i got x ≠ -1

posted on September 7, 2015
16. ## math

f(x)=x2−1, g(x)=2x+2, then (fg)(x)= x2−12x+2, x≠1 so is this correct

posted on September 7, 2015
17. ## math

so is g of x the inverse

posted on September 7, 2015
18. ## physics

This is what I got so far by using formaul for maximum height mu^2 sin^2 theta/2g = h and then mu^2(sin60)^2/2*9.81 = 3.048 so mu = 8.929m/s^2 please let me know if I am on correct path and what am I supppose to do next

posted on June 11, 2015
19. ## physcis

does that makes sense to you ?

posted on June 11, 2015
20. ## physcis

This is how I did h = 1/2gt^2 t = sqrt2h/g = sqrt2*0.85/9.8 so t= 0.41628 total time = 2t = 0.832sec v^2 = v^2 +2gh v^2 = 0+2*9.81*0.1 v = 1.4 v= v+at 1.4 = v = 0+ 9.81 *t t = 0.142 secs total time 2t = 0.284sec so 0.284/0.832 = 0.391

posted on June 11, 2015
21. ## Physics

This is what I got so far by using formaul for maximum height mu^2 sin^2 theta/2g = h and then mu^2(sin60)^2/2*9.81 = 3.048 so mu = 8.929m/s^2 please let me know if I am on correct path and what am I supppose to do next

posted on June 11, 2015
22. ## Pre-Calculus

Well I need to graph it but it days I did it wrong. I don't know what to do with the 2 in front. I made a sign chart and got +,+,+,- and used the roots -2,0,5 and grape it but I think I'm making a mistake somewhere.

posted on March 25, 2012
23. ## chem

no that's the whole question

posted on August 29, 2010
24. ## chemistry- proofread n help

all of the are correct except for CoSO4 is cobalt sulfate (SO4 is a Polyatomic ion

posted on March 8, 2008
25. ## English

MANAGE!! :)

posted on September 27, 2007