# physics

Most popular questions
1. ## PHYSICS

express dissipated power in terms of voltage and resistance. express dissipated power in terms of current and resistance

asked by preya on September 8, 2013
2. ## Physics

An green hoop with mass mh = 2.4 kg and radius Rh = 0.14 m hangs from a string that goes over a blue solid disk pulley with mass md = 2.2 kg and radius Rd = 0.1 m. The other end of the string is attached to a massless axel through the center of an orange

asked by stewart on November 10, 2014
3. ## Physics

While working on her bike, Amanita turns it upside down and gives the front wheel a counterclockwise spin. It spins at approximately constant speed for a few seconds. During this portion of the motion, she records the x and y positions and velocities, as

asked by Sam on August 19, 2012
4. ## Physics

A soccer ball kicked on a level field has an initial vertical velocity component of 15 meters per second. Assuming the ball lands at the same height from which it was kicked, what is the total time the ball is in the air? [Neglect friction.]

asked by Shannon on November 14, 2012
5. ## Physics

An 80- quarterback jumps straight up in the air right before throwing a 0.43- football horizontally at 15 . How fast will he be moving backward just after releasing the ball? Suppose that the quarterback takes 0.30 to return to the ground after throwing

6. ## physics

An object with mass 3.0 kg is attached to a spring with spring stiffness constant k = 300 N/m and is executing simple harmonic motion. When the object is 0.020 m from its equilibrium position, it is moving with a speed of 0.55 m/s. (a) Calculate the

asked by Nicole on March 7, 2012
7. ## Physics

A wheel with rotational inertia I is mounted on a fixed, fricitonless axle. The angular speed w of the wheel is inccreased from zero to w_f in a time interval T. 1: What is the average net torque on the wheel during the time interval, T? a) w_f/T b)w_f/T^2

asked by Tammy on March 25, 2007
8. ## physics

Find the required angular speed, ω, of an ultracentrifuge for the radial acceleration of a point 2.00cm from the axis to equal 6.00×105 g (where g is the acceleration due to gravity).

asked by Anonymous on May 27, 2014
9. ## PHYSICS

27. Using energy considerations and assuming negligible air resistance, show that a rock thrown from a bridge 20.0 m above water with an initial speed of 15.0 m/s strikes the water with a speed of 24.8 m/s independent of the direction thrown.

asked by GILL on June 18, 2015
10. ## physics

A stone is suspended from the free end of a wire that is wrapped around the outer rim of a pulley, as shown in the figure (see the figure ). The pulley is a uniform disk with mass 10.4 and radius 51.0 and turns on frictionless bearings. You measure that

asked by Anonymous on May 13, 2012
11. ## Physics

A 69.5kg football player is gliding across very smooth ice at 2.15m/s . He throws a 0.470kg football straight forward. A) What is the player's speed afterward if the ball is thrown at 16.0m/s relative to the ground? B) What is the player's speed afterward

asked by David on May 27, 2014
12. ## Physics

In a hydroelectric dam, water falls 26.0 m and then spins a turbine to generate electricity. What is ∆U of 1.0 kg of water? Suppose the dam is 80% efficient at converting the water's potential energy to electrical energy. How many kilograms of water must

asked by Zach on November 30, 2009
13. ## physics

You throw a 20-N rock vertically into the air from ground level. You observe that when it is 15.0 m above the ground, it is travelling at 25.0 m/s upward. Use the work-energy theorem to find a) its speed just as it left the ground; b) its maximum height.

asked by anton on February 21, 2010
14. ## physics

A pulley is suspended by a Cord (C). on one end of the pulley there is a 1.2 kg block and on the other is a 3.2 kg block.Determine the tension in this cord after the masses are released and before one hits the ground. Ignore the mass of the pulley and

asked by Anonymous on February 14, 2013
15. ## Physics

(a) How high a hill can a car coast up (engine disengaged) if work done by friction is negligible and its initial speed is 110 km/h? (b) If, in actuality, a 750-kg car with an initial speed of 110 km/h is observed to coast up a hill to a height 22.0 m

asked by Anonymous on June 10, 2014
16. ## Physics

A 20 kg crate is placed on a horizontal conveyor belt. The materials are such that us = 0.47 and uk = 0.21. What is the maximum acceleration the belt can have without the crate slipping? If acceleration of the belt exceeds the value determined in part A,

asked by Leanna on March 3, 2013
17. ## physics

Two artificial satellites, 1 and 2, orbit the Earth in circular orbits having radii R1 and R2. If R2=2R1, the accelerations a2 and a1 of the satellites are related how?

asked by Hannah on January 19, 2008
18. ## Physics

Suppose you exert a force of 180 N tangential to a 0.280-m-radius 75.0-kg grindstone (a solid disk). (a)What torque is exerted? (b) What is the angular acceleration assuming negligible opposing friction? (c) What is the angular acceleration if there is an

asked by Justin on July 14, 2013
19. ## Physics

A 50 g ball of clay traveling at speed v0 hits and sticks to a 1.0 kg block sitting at rest on a frictionless surface. A) What is the speed of the block after the collision? B) What percentage of the ball's initial energy is "lost"?

asked by Trevor on June 2, 2014
20. ## physics

Suppose 3 mols of neon (an ideal monatomic gas) at STP are compressed slowly and isothermally to 0.19 the original volume. The gas is then allowed to expand quickly and adiabatically back to its original volume. Find the highest temperature attained by the

asked by david on January 26, 2011
21. ## Physics

James Cameron piloted a submersible craft to the bottom of the Challenger Deep, the deepest point on the ocean's floor, 11,000 m below the surface. What was the total inward force on the 1.1-m-diameter pilot sphere in which Cameron sat?

asked by Kelsey on August 21, 2018
22. ## Physics

A 2.0-kilogram laboratory cart is sliding across a horizontal frictionless surface at a constant velocity of 4.0 meters per second east. What will be the cart’s velocity after a 6.0-newton westward force acts on it for 2.0 seconds? (1) 2.0 m/s east (3)

asked by James on January 3, 2008
23. ## physics

2. At time t =0, the current to the dc motor is reversed, resulting in an angular displacement of the motor shaft given by θ = (198 rad/s)t – (24 rad/s2)t2 – (2 rad/s3)t3 a. At what time is the angular velocity of the motor shaft zero? b. Calculate

asked by bruce on April 27, 2013
24. ## Physics

a small rock with mass 0.20 kg is released from rest at point A which is at the top edge of a large, hemispherical bowl with radius R = .5m. assume that the size of the rock is small compared to R, so that the rock can be treated as a particle, and assume

asked by Frankie on October 23, 2012
25. ## Physics

A 6.0kg box is on a frictionless 45∘ slope and is connected via a massless string over a massless, frictionless pulley to a hanging 2.4kg weight. What is the tension in the string if the 6.0kg box is held in place, so that it cannot move? If the box is

asked by Physics Help on May 16, 2014
26. ## Physics

A sample of helium behaves as an ideal gas as it is heated at constant pressure from 273 K to 353 K. If 25.0 J of work is done by the gas during this process, what is the mass of helium present?

asked by Sean on May 13, 2011
27. ## physics

A wave of amplitude .30 m interferes with a second wave of amplitude .20 m. What are the largest and smallest displeacements that can occur? What type of interference is demonstrated by each displacement?

asked by Lee on September 8, 2009
28. ## physics

A 60.0-kg skier with an initial speed of 12.0 m/s coasts up a 2.50-mhigh rise and angle is 35 degrees.Find her final speed at the top, given that the coefficient of friction between her skis and the snow is 0.0800. (Hint: Find the distance traveled up the

asked by Amy on July 14, 2013
29. ## Physics

Problem 2- A 350 kg roller coaster starts from rest at point A and slides down the frictionless loop-the-loop shown in the figure. a) How fast is the roller coaster moving at point B? b) How hard does it press against the track at point B?

asked by Anonymous on December 12, 2013
30. ## physics

a light string 4 meters long is wrapped around a solid cylindrical spool with a radius of 0.075 m and a mass of .5 kg.a 5kg mass is then attached to the end of the string, causing the string to unwind from the spool. a. what is the angular acceleration of

asked by mariel on December 3, 2010
31. ## physics

Find the net torque on the wheel in the figure below about the axle through O perpendicular to the page, taking a = 11.0 cm and b = 23.0 cm. (Indicate the direction with the sign of your answer. Assume that the positive direction is counterclockwise.)

asked by Anonymous on April 30, 2012
32. ## Physics

An empty rubber balloon has a mass of 0.012kg. the balloon is filled with helium at 0 degrees celcius, 1 atm pressure, and a density of 0.179 kg/m3. the filled balloon has a radius of 0.5 m. a)what is the magnitude of the buoyant force acting on the

asked by Taylor on March 4, 2010
33. ## physics

A 0.50 kilogram ball is thrown vertically upward with an initial kinetic energy of 25 joules. Approximately how high will the ball rise ?

asked by lucy on April 30, 2011
34. ## physics

A cylinder that has a 40.0 cm radius and is 50.0 cm deep is filled with air at 20.0°C and 1.00 atm. A 21.0 kg piston is now lowered into the cylinder, compressing the air trapped inside. Finally, a 79.0 kg man stands on the piston, further compressing the

asked by Jessi on August 23, 2009
35. ## Physics

You raise a bucket of water from the bottom of a well that is 12 m deep. The mass of the bucket and the water is 5.00 kg, and it takes 15 s to raise the bucket to the top of the well. How much power is required? Pe= 60.00 Work= Force*direction

asked by Haylee on January 22, 2015
36. ## Physics

A 0.075 kg ball in a kinetic sculpture moves at a constant speed along a motorized conveyor belt. The ball rises 1.32 m above the ground. A constant frictional force of 0.350 N acts in the direction opposite the conveyor belt's motion. What is the net work

asked by Brian on December 9, 2010
37. ## PHYSICS

A 5.0 cm diameter coil of 20 turns with a resistance of 0.50 Ù is in a time-varying magnetic field which is perpendicular to the coil and is given by the expression; B = 0.010t2 + 0.020t, where B is in tesla and t is in seconds. a) Draw a graph of B as a

asked by MPHO on May 1, 2012
38. ## Physics

Black Holes are suspected when a visible star is being noticeably pulled by an invisible partner that is more than 3 times as massive as the Sun. A red giant star is accelerated in a linear direction by gravity at 0.075 m/s2 towards an object that is 9.4

asked by Alex on January 11, 2013
39. ## Physics

Flywheels are large, massive wheels used to store energy. They can be spun up slowly, then the wheel's energy can be released quickly to accomplish a task that demands high power. An industrial flywheel has a 1.5 m diameter and a mass of 250 kg. Its

asked by falcon306 on July 23, 2011
40. ## Physics

The drawing shows a square, each side of which has a length of L = 0.25 m. Two different positive charges q1 and q2 are fixed at the corners of the square. Find the electric potential energy of a third charge q3 = -7.00 10-9 C placed at corner A and then

asked by Anne on January 30, 2012
41. ## physics

A droplet of ink in an industrial ink-jet printer carries a charge of 1.1×10−10 C and is deflected onto paper by a force of 3.7×10−4 N.Find the strength of the electric field to produce this force.

asked by Helen on April 14, 2012
42. ## physics

A father racing his son has 1/3 the kinetic energy of the son, who has 1/3 the mass of the father. The father speeds up by 1.4 m/s and then has the same kinetic energy as the son. What are the original speeds of (a) the father and (b) the son?

asked by nan on October 3, 2011
43. ## Physics

A rocket-powered hockey puck moves on a horizontal frictionless table. The figure below shows the graphs of vx and vy, the x- and y-components of the puck’s velocity. The puck starts at the origin. The graph of the X-velocity is v=8t cm/s and the

asked by Eric on September 11, 2015
44. ## physics

A 0.054-kg pet lab mouse sits on a 0.35-kg air-track cart, as shown in (Figure 1) . The cart is at rest, as is a second cart with a mass of 0.25 kg. The lab mouse now jumps to the second cart. After the jump, the 0.35-kg cart has a speed of v1=0.80m/s.

asked by anonymous on April 18, 2017
45. ## Physics

Hi, can anybody provide some hints in how to approach these questions? I've been stuck on it for days!!! Thank you in advance!! Nodes of a Standing Wave: Consider a standing wave, where y represents the transverse displacement of a string that extends

asked by Tommy on March 14, 2015
46. ## Physics

The record time for a Tour de France cyclist to ascend the famed 1100-m-high Alpe d'Huez was 37.5 min, set by Marco Pantani in 1997. Pantani and his bike had a mass of 65 kg. Assume the body works with 25 % efficiency. A)How many Calories did he expend

asked by Morgyn on November 16, 2016
47. ## physics

A bike first accelerates from 0.0 m/s to 5.0 m/s in 4.5 s, then continues at this constant speed for another 4.5 s. What is the total distance traveled by the bike?

asked by lindsey on September 5, 2011
48. ## Physics

Hot air balloons float in the air because of the difference in density between cold and hot air. In this problem, you will estimate the minimum temperature the gas inside the balloon needs to be, for it to take off. To do this, use the following variables

asked by Jenny on July 13, 2011
49. ## Physics

A pile driver lifts a 450 kg weight and then lets it fall onto the end of a steel pipe that needs to be driven into the ground. A fall of 1.5 m drives the pipe in 45 cm. What is the average force exerted on the pipe?

asked by Alex on October 30, 2016
50. ## physics

Suppose the ski patrol lowers a rescue sled and victim, having a total mass of 95.0 kg, down a θ = 50.0° slope at constant speed. The coefficient of friction between the sled and the snow is 0.100. (a) How much work is done by friction as the sled moves

asked by Karina on July 9, 2015
51. ## Physics

As a box is pushed 30 meters across a horizontal floor by a constant horizontal force of 25 newtons, the kinetic energy of the box increases by 300 joules. How much total internal energy is produced during this process?

asked by Shannon on December 9, 2012
52. ## physics

the sensor in the torso of a crash-test dummy records the magnitude and direction of the net force acting on the dummy. if the dummy is thrown forward with a force of 130.0 N while simultaneously being hit from side with a force of 4500.0 N, what force

asked by i love polka on November 4, 2008
53. ## Physics

A billiard ball traveling at 3.00 m/s collides perfectly elastically with an identical billiard ball initially at rest on the level table. The initially moving billiard ball deflects 30.0° from its original direction. What is the speed of the initially

asked by Billy on November 13, 2014
54. ## physics

A 3.0kg- block sits on top of a 5.0kg block which is on a horizontal surface. The 5.0-kg block is pulled to the right with a force as shown in the figure . The coefficient of static friction between all surfaces is 0.65 and the kinetic coefficient is 0.42.

asked by kle on May 8, 2012
55. ## Physics

A 140 g baseball is dropped from a tree 15.5 m above the ground. With what speed would it hit the ground if air resistance could be ignored? If it actually hits the ground with a speed of 8.00 m/s, what is the magnitude of the average force of air

asked by Kensey on June 18, 2012
56. ## physics

A 3.1-kilogram gun initially at rest is free to move. When a 0.015-kilogram bullet leaves the gun with a speed of 500. meters per second, what is the speed of the gun?

57. ## Physics

A 75 kg box slides down a 25.0 degree ramp with an acceleration of 3.60 m/s^2. Find coefficient between the box and the ramp. What acceleration would a 175 kg box have on this ramp?

asked by Terrence Eko on November 12, 2009
58. ## Physics

A small wooden block with mass 0.800kg is suspended from the lower end of a light cord that is 1.52m long. The block is initially at rest. A bullet with mass 0.0126kg is fired at the block with a horizontal velocity v0. The bullet strikes the block and

asked by Katie on March 12, 2015
59. ## physics

when a 2.50 kg object is hung vertically on a certain light spring described by hookes law the spring stretches 2.76 cm. A) what is the force constant of the spring. B) if the 2.50 kg object is removed how far will the spring strecth if a 1.25 kg block is

asked by joe on November 6, 2011
60. ## physics

The earth has a radius of 6380 km and turns around once on its axis in 24 h. 1)What is the radial acceleration of an object at the earth's equator? Give your answer in m/s^2 2) What is the radial acceleration of an object at the earth's equator? Give your

asked by Ami on September 9, 2010
61. ## Physics

A child's toy consists of a block that attaches to a table with a suction cup, a spring connected to that block, a ball, and a launching ramp. (Intro 1 figure) The spring has a spring constant k, the ball has a mass m, and the ramp rises a height y above

asked by Sam on October 31, 2008
62. ## physics

Determine the resulting temperature when 150g of ice at 0°C is mixed with 300g of water at 50°C

asked by aj on March 9, 2011
63. ## physics

Driving in your car with a constant speed of v= 22 m/s, you encounter a bump in the road that has a circular cross-section, as indicated in the figure (Figure 1) . Part A If the radius of curvature of the bump is 52 m, find the apparent weight of a 66-kg

asked by alex on March 28, 2017
64. ## Physics

One end of a uniform meter stick is placed against a vertical wall. The other end is held by a lightweight cord that makes an angle, theta, with the stick. The coefficient of static friction between the end of the meter stick and the wall is 0.390. A. what

asked by Karla on April 3, 2007
65. ## Physics

A body of volume hundred centimetre cube is immersed completely in water contained in a jar containing water. the weight of the jar and the water before immersion was 700 grams. After immersion weight of the jar and the water will be

asked by Vidhi on July 27, 2016
66. ## physics

A 40 g marble moving at 2.3 m/s strikes a 29 g marble at rest. Assume the collision is perfectly elastic and the marbles collide head-on. What is the speed of the first marble immediately after the collision? What is the speed of the second marble

asked by CO2136 on August 10, 2011
67. ## Physics

If 6.40 x 10^-19 joule of work is required to move a proton between two points A and B in an electric field, what is the potential difference between points A and B? Given: W = 6.40 x 10^-19

asked by Priscilla on February 5, 2010
68. ## Physics

A grasshopper leaps into the air from the edge of a cliff at a 50 degree angle. He reaches a maximum height 6.74 cm above the top of the cliff and travels a total horizontal distance of 1.06 m. How tall is the cliff and what is the initial speed of the

asked by Sarah on June 12, 2015
69. ## physics

A space station, in the form of a wheel 110 m in diameter, rotates to provide an "artificial gravity" of 3.00 m/s2 for persons who walk around on the inner wall of the outer rim. Find the rate of rotation of the wheel (in revolutions per minute) that will

asked by laura on July 10, 2010
70. ## physics

A large box of mass M is pulled across a horizontal, frictionless surface by a horizontal rope with tension T. A small box of mass m sits on top of the large box. The coefficients of static and kinetic friction between the two boxes are μs and μk,

asked by jjh on February 22, 2017
71. ## Physics

A 1000 kg car pushes a 2000 kg truck that has a dead battery. When the drive steps on the accelerator, the drive wheels of the car push against the ground with a force of 4500 N. a) What is the magnitude of the force of the car on the truck? b) what is the

asked by Sarah on June 12, 2010
72. ## Physics

A hollow, spherical shell with mass 2.00 kg rolls without slipping down a slope angled at 38.0 degrees. (a) Find the acceleration, the friction force, and the minimum coefficient of fricition needed to prevent slipping. You will find the moment of inertia

asked by Karla on March 27, 2007
73. ## Physics

Two forces are applied to a car in an effort to move it, as shown in the following figure, where F1 = 402 N and F2 = 364 N. (Assume up and to the right as positive directions.)(F1 is 10degrees and F2 is 30degrees) (a) What is the resultant of these two

asked by Dani on May 3, 2011
74. ## physics

a jet pilot takes his aircraft in a vertical loop. a) if the jet is moving at a speed of 2000 km/h at the lowest point of the loop, determine the minimum radius of the circle so that the centripetal acceleration at the lowest point does not exceed 6.0g's

asked by jeffery on October 4, 2009
75. ## Physics

A block slides from rest with negligible friction down a track, descending 5.0m to point P at the bottom. It then slides on the horizontal surface. The coefficient of friction between the block and the horizontal surface is 0.20. How far does the block

asked by Anonymous on December 29, 2012
76. ## Physics

An 80-ft-diameter Ferris wheel rotates once every 23s. What is the apparent weight of a 80kg passenger at the lowest point of the circle? Express your answer in SI units. I know to use the equation mg-N=m(v^(2)/r) but I can't figure out how to come away

asked by Skyler on February 24, 2015
77. ## physics

Suppose you had two small boxes, each containing 1.0 g of protons. (a) If one were placed on the moon by an astronaut and the other were left on the earth, and if they were connected by a very light (and very long!) string, what would be the tension in the

asked by Jen on January 21, 2008
78. ## physics

The minute hand of a large clock is 0.50 m long. (A) Calculate its linear speed at its tip in meters per second. (0.000873 m/s) (B) Calculate the centripetal acceleration of the tip of the hand. (1.52 x 10-6 m/s2)

asked by Steffine on January 7, 2014
79. ## Physics

Maria throws a ball straight up with an initial velocity of 10 m/s. What is its velocity at the highest point? What is its velocity when it returned to the elevation from where it is thrown ? What is its acceleration at the highest point? What is its

asked by Joyce on September 19, 2015
80. ## physics

A 0.400 kg ball is shot directly upward at initial speed 40.0 m/s. What is its angular momentum about a point 2.0 m horizontal from the launch point, when the ball is a) at maximum height and b) halfway back to the ground? What is the torque on the ball

asked by jane on June 13, 2009
81. ## Physics

What is the moment of inertia of an object that rolls without slipping down a 2.00-m-high incline starting from rest, and has a final velocity of 6.00 m/s? Express the moment of inertia as a multiple of MR2, where M is the mass of the object and R is its

asked by Justin on July 14, 2013
82. ## Physics

You want to use a rope to pull a 12-kg box of books up a plane inclined 30∘ above the horizontal. The coefficient of kinetic friction is 0.29. The rope pulls parallel to the incline. What force do you need to exert on the rope if you want to pull the box

asked by Katie on September 30, 2014
83. ## Physics

An 8.0-kg history textbook is placed on a 1.25-m high desk. How large is the gravitational potential energy of the textbook-earth system relative to the desktop?

asked by Anonymous on October 4, 2017
84. ## PHYSICS

Calculate the power output of a 1.3-g fly as it walks straight up a windowpane at 2.5 cm/s

asked by Lizbeth on April 10, 2008
85. ## physics

A model rocket leaves the ground, heading straight up at 47 m/s. (a) What is its maximum altitude? m What are its speed and altitude at each of the following times? (b) 1 s m/s m (c) 4 s m/s m (d) 8 s m/s m

asked by Jen on January 16, 2011
86. ## Physics

A ball is thrown straight downward with a speed of 0.50 m/s from a height of 4.0 meters. What is the speed of the ball 0.70 seconds after it is released? GIVEN: Vi = 0.50 m/s Vf = ? d = 4 m t = 0.70 s

asked by Priscilla on February 2, 2010
87. ## physics

a 2000 kg car rounds a circular turn of radius 20.0 meters. if the road is flat and the coefficient of static friction between the tires and the road is .70, how fast can the car go without skidding

asked by mallory!!!!!!!!!!!! on January 24, 2010
88. ## physics

If a projectile is launched vertically from the Earth with a speed equal to the escape speed, how far from the Earth's center is it when its speed is 1/9 of the escape speed?

asked by Turk on April 28, 2012
89. ## Physics

When some stars use up their fuel, they undergo a catastrophic explosion called a supernova. This explosion blows much or all of a star's mass outward, in the form of a rapidly expanding spherical shell. As a simple model of the supernova process, assume

asked by Cat on January 29, 2013
90. ## physics

1. A man pushes on a box at an angle of 30.0° with a force of 20.0 N and the box moves across the floor. Which of the following component of the force do you use to calculate work? (Points : 1) 0.00 N 10.0 N 17.3 N 20.0 N Question 2.2. A man carries a 10

asked by Hailey on February 2, 2015
91. ## Physics

Two cars are traveling along a straight road. Car A maintains a constant speed of 79 km/h and car B maintains a constant speed of 114 km/h. At t = 0, car B is 36 km behind car A. (a) How much farther will car A travel before car B overtakes it? ? km (b)

asked by Anonymous on July 8, 2015
92. ## physics

A copper atom has 29 electrons revolving around the nucleus. A copper ball has 4x10^23 atoms. What fraction of the electrons be removed to give the ball a charge of +9.6uC?

asked by David on March 31, 2015
93. ## physics

Archer pulls her bow string back 0.4 m by exerting a force that increases uniformly from zero to 230 N. What is the equivalent spring constant of the bow? This is what I did: F = kx 230 N = k(0.4 m) 575 = K My question is this: Is the answer just 575 or is

asked by Nabil on February 21, 2011
94. ## physics

THree blocks of masses 3m, 2m and m are connected to strings A,B, and C. The blocks are pulled along a rough surface by a force of magnitude F exerted by string C. The coefficient of friction between each block and the surface is the same. Which string

asked by me on December 28, 2006
95. ## physics

Reggie Jackson stepped up to the plate and hit a .15 kg fast ball traveling at 36m/s, the impact caused the ball to leave his bat with a velocity of 45 m/s in the opposite direction. If the impact lasted for .002 seconds, with what force did Jackson exert

asked by chelsea on May 27, 2009
96. ## PHySics

A 1.63 nF parallel-plate capacitor is charged to an initial potential difference ΔVi = 100 V and then isolated. The dielectric material between the plates is mica, with a dielectric constant of 5.00. (a) How much work is required to withdraw the mica

asked by Physics on May 12, 2010
97. ## Physics

A motorcycle is following a car that is traveling at constant speed on a straight highway. Initially, the car and the motorcycle are both traveling at the same speed of 19.0m/s , and the distance between them is 52.0m . After t1 = 5.00s , the motorcycle

asked by Anonymous on January 24, 2015
98. ## physics

Water falls from a height of 84 m. Assuming that all the energy is converted into heat, the rise in temperature of water will be (4200 J/(kg °C) and g=10 m/s2)?

asked by Salem on December 4, 2012
99. ## Physics

1. The electrostatic force of attraction between two small spheres that are 1.0 meter apart is F. If the distance between the spheres is decreased to 0.5 meter, the electrostatic force will be a) F/2 b) 2f c) F/4 d) 4F I know when the distance is decreased

asked by Priscilla on February 3, 2010
100. ## physics

Two workhorses tow a barge along a straight canal. Each horse exerts a constant force of magnitude F, and the tow ropes make an angle θ with the direction of motion of the horses and the barge. (Figure 1) Each horse is traveling at a constant speed v. How

asked by HELP on October 24, 2013