Thursday
July 31, 2014

# Homework Help: Science: Physics

physics
calculate the magnitude of the electrical force between object a with a chaarge of 15mc and object b with a charge of 3mcc. they are located 0.4m apart.
Thursday, March 27, 2014 at 11:57am

physics
a car traveling at 43m/s decelerates at a rate of 7.1 m/s squared. how long did it take the car to stop? what distance did the car travel while stopping?
Thursday, March 27, 2014 at 2:29am

Physics Help
It starts saying that impulse is related to velocity in a certain way. What is that relationship? I just said impulse = force x time and momentum = mass x velocity So would that be a correct answer to what they're wanting? Also, it says there is a relationship to be found ...
Thursday, March 27, 2014 at 1:28am

physics
Two electrons start at rest with a seperation of 5e-12 metres. Once released, the electrons accerelate away from each other. Calculate the speed of each electron when they are a very large distance apart.
Thursday, March 27, 2014 at 12:25am

science- Physics
Two electrons start at rest with a seperation of 5e-12 metres. Once released, the electrons accerelate away from each other. Calculate the speed of each electron when they are a very large distance apart.
Thursday, March 27, 2014 at 12:24am

physics
At some point in the combustion cycle of an engine, the temperature of a combusted air-fuel mixture is 582 degrees Celsius. Given that the pressure in the mixture is 6.2 bar, determine the density of the mixture (in kilogram per cubic metre).
Thursday, March 27, 2014 at 12:10am

physics
A typical volume of a modern hot air balloon is 2500 cubic metres, and a typical maximum temperature of the hot air is 120 degrees Celsius. Given these figures, and an outside air temperature and density of 15 $$^{\circ}C$$ and 1.225 $$kg/m^3$$ respectively, compute the ...
Thursday, March 27, 2014 at 12:04am

physics
Suppose that, on a day when the outside temperature is 15 degrees Celsius, we fill a balloon with pure nitrogen gas, of which the molar mass is 28 grams per mole. Now suppose that we want to heat up a second (equally large) balloon containing air, such that it generates the ...
Thursday, March 27, 2014 at 12:02am

physics
Some say that the hot air balloons with which the Montgolfier brothers performed their first flight had a volume of 1700 cubic metres and could lift 780 kilograms (that includes the balloon, basket and payload). Assume that the balloon took off on a day when the sea level ...
Thursday, March 27, 2014 at 12:00am

physics
Suppose that a party balloon is spherical, has a radius of 16 centimetres and is filled with helium. Furthermore suppose that we do our experiment under standard atmospheric conditions, when the air density is $$\rho = 1.225 kg/m^3$$. How many of these balloons should a 75 ...
Wednesday, March 26, 2014 at 11:59pm

physics
Others say that the balloon was 23 metres high and 14 metres wide. Calculate the temperature of the air in the balloon (in degrees Celsius) for this situation as well
Wednesday, March 26, 2014 at 11:56pm

physics
what is the final temperature when 3 pound of water at 100 degree fahrenheit is added to 500 lb at 40 degree fahrenheit
Wednesday, March 26, 2014 at 10:19pm

physics
A baseball of mass m1 = 0.32 kg is thrown at a concrete block m2 = 6.25 kg. The block has a coefficient of static friction of μs = 0.71 between it and the floor. The ball is in contact with the block for t = 0.195 s while it collides elastically. What is the minimum ...
Wednesday, March 26, 2014 at 9:00pm

physics
A car moving with an initial speed v collides with a second stationary car that is 50.7 percent as massive. After the collision the first car moves in the same direction as before with a speed that is 33.2 percent of the original speed. Calculate the final speed of the second ...
Wednesday, March 26, 2014 at 7:48pm

physics
The small piston of a hydraulic lift has an area of 0.10 m2. A car weighing 2.0 x 104 N sits on a rack mounted on the large piston. The large piston has an area of 0.50 m2. How large a force must be applied to the small piston to support the car?
Wednesday, March 26, 2014 at 5:31pm

physics
A simple pendulum consists of a small object of mass 1.2 kg hanging at the end of a 2.07 m long light string that is connected to a pivot point. Calculate the magnitude of the torque (due to the force of gravity) about this pivot point when the string makes an angle of 6.59 ...
Wednesday, March 26, 2014 at 1:35pm

I need help with Physics
A baseball of mass m1 = 0.46 kg is thrown at a concrete block m2 = 8.25 kg. The block has a coefficient of static friction of μs = 0.81 between it and the floor. The ball is in contact with the block for t = 0.165 s while it collides elastically. m1 = 0.46 kg m2 = 8.25 ...
Wednesday, March 26, 2014 at 1:18pm

Physics
suppose that you drop the ball from a height of about 2m above the floor, releasing it from rest. on the axes that follow, sketch your predictions for the velocity-time and acceleration-time graphs of the ball's motion. assume that the positive y direction is upward
Wednesday, March 26, 2014 at 12:14pm

physics
How long will it take a watch dropped from a bridge (20.3 meters above the water) to hit the water?
Wednesday, March 26, 2014 at 9:58am

MOUAU(physics)
F̶̲̥̅̊o̲&#​803;̥я̲̣̥ a metallic conductor,Ohm's law holds provided
Wednesday, March 26, 2014 at 9:48am

physics
A stone of mass m kg is held h metres above the floor 50s.The workdone in joules over this period is
Wednesday, March 26, 2014 at 5:39am

college physics
A 0.240-kg billiard ball that is moving at 3.00 m/s strikes the bumper of a pool table and bounces straight back at 2.40 m/s (80% of its original speed). The collision lasts 0.0150 s. (a) Calculate the average force exerted on the ball by the bumper. (b) How much kinetic ...
Wednesday, March 26, 2014 at 2:32am

college physics
Competitive divers pull their limbs in and curl up their bodies when they do flips. Just before entering the water, they fully extend their limbs to enter straight down. Explain the effect of both actions on their angular velocities. Also explain the effect on their angular ...
Wednesday, March 26, 2014 at 1:48am

physics
What force should the woman in Figure 9.45 exert on the floor with each hand to do a push-up? Assume that she moves up at a constant speed.
Wednesday, March 26, 2014 at 12:38am

Physics
Add the vectors 1. 6.0m N and 4.0 NE 2. 6.0m N25E and 4.0 E
Tuesday, March 25, 2014 at 10:53pm

Physics
A car moving at a constant speed of 50km/h turns a corner, changing it's direction from north to west. What is it's change in velocity. What was the acceleration if the then took 5s
Tuesday, March 25, 2014 at 10:51pm

physics!!!!!
A bucket of mass 1.80kg is whirled in a vertical circle of radius 1.55m . At the lowest point of its motion the tension in the rope supporting the bucket is 28.0N. A-find the speed of the bucket. B-How fast must the bucket move at the top of the circle so that the rope does ...
Tuesday, March 25, 2014 at 10:35pm

Physics
Thanks for taking a look! A baseball of mass m1 = 0.46 kg is thrown at a concrete block m2 = 8.25 kg. The block has a coefficient of static friction of μs = 0.81 between it and the floor. The ball is in contact with the block for t = 0.165 s while it collides elastically...
Tuesday, March 25, 2014 at 10:32pm

Physics
1. A car decelerates at -3.8 without skidding when coming to rest on a level road. What would be its deceleration if the road is inclined at 9.3° and the car moves uphill? (Asume the same static friction coefficient and the car is on the verge of skidding)
Tuesday, March 25, 2014 at 9:47pm

Physics
The bulk modulus of a liquid is 4.0 10^10 N/m2. Suppose a volume of 0.6 m3 of the liquid is taken from the surface where the pressure is approximately that of the atmosphere (1.00 10^5 N/m2) and is lowered into a pool of liquid to a depth where the pressure is 2.00 10^7 N/m2. ...
Tuesday, March 25, 2014 at 8:38pm

physics
What is the pressure that is exerted by a box tjat has a dimension of 12cm long and 14cm wide and has a force of gravity on the box of 40N?
Tuesday, March 25, 2014 at 8:36pm

Physics
A 150g piece of copper is heated to 100oC. It is then held in the open air for 2 minutes and 31 seconds, and then dropped into a 100g copper calorimeter containing 200g of water at 17oC. If the rate of loss of heat of the copper piece while held in the air is 12.6J/sec, ...
Tuesday, March 25, 2014 at 8:34pm

physics
A 100-g toy car is propelled by a compressed spring that starts it moving. The car follows the curved track Show that the final speed of the toy car is 0.687 m/s if its initial speed is 2.00 m/s and it coasts up the frictionless slope, gaining 0.180 m in altitude
Tuesday, March 25, 2014 at 8:33pm

Physics
An aluminum calorimeter has a mass of 60g and an initial temperature of 25oC. What is the final temperature attained when 86.8g of water at 90oC is poured into it?
Tuesday, March 25, 2014 at 8:24pm

Physics
When a rubber rod is rubber with wool, the rod becomes negatively charged. What can you conclude about the magnitude of the wool's charge after the rubber process? Why? Please Help!!
Tuesday, March 25, 2014 at 7:57pm

Physics
When a rubber rod is rubber with wool, the rod becomes negatively charged. What can you conclude about the magnitude of the wool's charge after the rubber process? Why? Please Help!!
Tuesday, March 25, 2014 at 7:56pm

physics
In a water park, people walk up a ramp before diving into the water below. If they cover a horizontal distance of 100 meters before diving down 50 meters, what is the angle made by the ramp with the ground?
Tuesday, March 25, 2014 at 7:50pm

physics 1
When jumping straight down, you can be seriously injured if you land stiff-legged. One way to avoid injury is to bend your knees upon landing to reduce the force of the impact. A 88.1-kg man just before contact with the ground has a speed of 3.53 m/s. (a) In a stiff-legged ...
Tuesday, March 25, 2014 at 5:45pm

physics
a spaceship is moving at 1000 m/s release a satellite of mass 1000 kg at a speed of 10 000 m/s. what is the mass of the spaceship if it slows down to a velocity of 910 m/s?
Tuesday, March 25, 2014 at 4:43pm

Physics
Assume that all of the mass of a bicycle wheel is concentrated at its rim. Such a wheel of mass 1.2 kg and radius 30 cm starts from rest at the top of a hill 100m long and inclined at 20 degrees to the horizontal. What will be the speed of the wheel at the bottom of the hill ...
Tuesday, March 25, 2014 at 4:29pm

physics
a spaceship is moving at 1000 m/s release a satellite of mass 1000 kg at a speed of 10 000 m/s. what is the mass of the spaceship if it slows down to a velocity of 910 m/s?
Tuesday, March 25, 2014 at 4:28pm

Physics
Help me understand this please You have a 2.00 kg block of lead. Lead melts at 327.5°C. CPb = 130.0 , and Hf for lead is 2.04 × 10^4 J/kg. Say you start at room temperature (25.0°C). How much heat must you transfer to melt all the lead?
Tuesday, March 25, 2014 at 4:17pm

physics
A car entering the freeway accelerates from 10.2 m/s with a constant acceleration of 4.4 m/s2. What is the car’s final velocity when it merges onto the highway and reaches its cruising speed 4.2 seconds later? A 28.7 m/s B 11.2 m/s C 18.5 m/s D 8.28 m/s
Tuesday, March 25, 2014 at 1:00pm

PHysics XXX
An airplane travels 330 m down the runway before taking off. Assuming that it has constant acceleration, if it starts from rest and becomes airborne in 9.00 s, how fast (in m/s) is it moving at takeoff? A 73.3 m/s B 36.7 m/s C 1490 m/s D 660 m/s
Tuesday, March 25, 2014 at 12:58pm

Physics
An object with a mass of 5 kg moves at a constant velocity when it is pulled by a horizontal force of 5 N on a level surface. What is the acceleration of the object if the object is pulled with a force of 25 N?
Tuesday, March 25, 2014 at 9:49am

Physics
In Stranger in a Strange Land, Robert Heinlein claims that travelers to Mars spent 258 days on the journey out, the same for return, \plus 455 days waiting at Mars while the planets crawled back into positions for the return orbit." Show that travelers would have to wait ...
Tuesday, March 25, 2014 at 9:05am

physics
this is a physics qustion im stuck on: ingrid holds the womans record time for a marathon race of 2h 21min 6s for 42.195km. The mens record is held by Blake grison of 2h 6 min 50s. If they had been in the same race how much would blake win by.. find this in time as well as ...
Tuesday, March 25, 2014 at 7:56am

Physics
A series RCL circuit contains only a capacitor (C=6.60 F), an inductor (L=7.20 mH), and a generator (peak voltage=32.0 V, frequency=1.50x10^3 Hz). When t  0 s, the instantaneous value of the voltage is zero, and it rises to a maximum one-quarter of a period later. (a) ...
Tuesday, March 25, 2014 at 3:27am

physics
Determine the distance to which the 90 kg painter can climb without causing the 4 m ladder to slip at its lower end A as shown in Figure 1. The top of the 15 kg ladder has a smaller roller, and at the ground the coefficient of static friction is 0.25. The mass center of the ...
Tuesday, March 25, 2014 at 2:48am

physics
1 - Determine the distance to which the 90 kg painter can climb without causing the 4 m ladder to slip at its lower end A as shown in Figure 1. The top of the 15 kg ladder has a smaller roller, and at the ground the coefficient of static friction is 0.25. The mass center of ...
Tuesday, March 25, 2014 at 2:32am

Physics
A series circuit contains only a resistor and an inductor. The voltage V of the generator is fixed. If R = 15 and L = 5.6 mH, find the frequency at which the current is one-half its value at zero frequency. ?? Hz Thanks!
Monday, March 24, 2014 at 11:46pm

physics
A compact disk player has just been turned off. A disk decelerates uniformly from an initial angular velocity of 7.90 rev/s. The disk rotates through 5.50 revolutions before coming to rest. What is the tangential acceleration of a point on the disk 5.05 cm from the axis?
Monday, March 24, 2014 at 10:51pm

Physics
A wagon is coasting at a speed vA along a straight and level road. When twenty-five percent of the wagon's mass is thrown off the wagon, parallel to the ground and in the forward direction, the wagon is brought to a halt. If the direction in which this mass is thrown is ...
Monday, March 24, 2014 at 9:46pm

Physics
A box of mass 54.0 kg is sitting on a ramp which makes an angle of 37.0 degrees with respect to the horizontal. The coefficient of friction between the box and the ramp is 0.21. This box is connected by a massless string over a pulley at the top of the ramp to a second box ...
Monday, March 24, 2014 at 8:51pm

Physics
A box of mass 50.0 kg is connected to a second box with a mass of 54.0 kg. Both are sitting on a horizontal surface and the coefficient of kinetic friction between the surface and each box is 0.51. If the second box is pulled away from the first box with a force of 605.8 N, ...
Monday, March 24, 2014 at 8:51pm

Physics
A wave can be propagated on a rope by holding one end of the rope and moving your hand up and down. The resulting wave is: A)neither transverse nor longitudinal. B)both transverse and longitudinal C)longitudinal D)transverse
Monday, March 24, 2014 at 8:17pm

Physics
Two boxes of mass 7.40 and 7.00 kg are in contact and are accelerated across a horizontal surface by an force of 51.49 N applied parallel to the surface and pushing on the lighter box. The magnitude of the frictional force between the surface and the lighter mass is 9.26 N and...
Monday, March 24, 2014 at 8:09pm

Physics
Two blocks of weights 77.0 and 114.0 N are connected by as massless string and slide down an inclined plane making an angle of 45.0 deg. to the horizontal. The cofficient of kinetic friction between the lighter block and the plane is 0.15 and that between the heavier block and...
Monday, March 24, 2014 at 8:08pm

Physics
A railroad car with a mass of 12000 kg collides and couples with a second car of mass 18000 kg that is initially at rest. The first car is moving with a speed of 9 m/s before collision. If external forces can be ignored, what is the final speed of the two railroad cars after ...
Monday, March 24, 2014 at 8:06pm

Physics
A 5-kg ball is at rest when it is struck head-on by a 2-kg ball moving along a track at 10 m/s. If the 2-kg ball is at rest after the collision, what is the speed of the 5-kg ball after the collision?
Monday, March 24, 2014 at 8:05pm

A diver stands on the end of a diving board as shown in the figure on the right. The mass of the diver is 58 kg and the mass of the uniform diving board is 35 kg. Calculate the magnitudes and directions of the forces exerted on the board at the points A and B. (A & B are 1 ...
Monday, March 24, 2014 at 7:11pm

physics
A person has a choice while trying to move a crate across a horizontal pad of concrete: push it at a downward angle of 30 degrees, or pull it at an upward angle of 30 degrees. If the crate has a mass of 50.0 kg and the coefficient of friction between it and the concrete is 0....
Monday, March 24, 2014 at 6:56pm

Physics
A 115.0 kg box is pushed by a horizontal force F at constant speed up a frictionless ramp which makes an angle of 46.0 deg with the horizontal.what is the magnitude of the normal force between the ramp and the box? The applied force= 1167.04N
Monday, March 24, 2014 at 6:52pm

Physics( Explain and choose right answer)
A ball on the end of a rope is moving in a vertical circle near the surface of the earth. Point A F T is at the top of the circle; C is at the bottom. Points B and D are exactly halfway between A and C. Which one of the following statements concerning the tension in the rope ...
Monday, March 24, 2014 at 6:40pm

Physics( Explain and choose right answer)
How long is a golf club in contact with a golf ball for? A. 0.5 seconds B. 0.1 seconds C. 0.01 seconds D. 0.001 seconds E. 0.0001 seconds F. Too short to measure
Monday, March 24, 2014 at 6:35pm

Physics( Explain and choose right answer)
A 3 kg cat sitting on a 1.5 kg piece of cardboard on a frozen lake wants to jump to shore without touching the ice. If there is no friction between the cardboard and the ice, when the cat jumps. the cardboard will move in the opposite direction with a velocity: A. half as ...
Monday, March 24, 2014 at 6:31pm

Physics
The drawing shows an equilateral triangle, each side of which has a length of 2.20 cm. Point charges are fixed to each corner, as shown. The 4.00 µC charge experiences a net force due to the charges qA and qB. This net force points vertically downward and has a magnitude...
Monday, March 24, 2014 at 6:29pm

Physics
A 2.00-kg object is hanging on a 1.1m string. The object is pulled 20cm away from the equilibrium position and held there. a) What is the pulling force in the string when the object is kept still ? b) Now the object is released, what is the speed of the object when it goes ...
Monday, March 24, 2014 at 6:17pm

Physics
A 5.1- kg concrete block rests on a level table. A 3.4- kg mass is attached to the block by a string passing over a light, frictionless pulley. If the acceleration of the block is measured to be 1.3 m/s2, what is the coefficient of friction between the block and the table? ...
Monday, March 24, 2014 at 5:06pm

Physics
A ladder, 5.0 m long, leans against a frictionless wall at a point 4.0 m above the ground. A painter is climbing up the ladder. The mass of the ladder is 12.0 kg and the mass of the painter is 60.0 kg. The ladder begins to slip at its base when the painter is 70 % of the way ...
Monday, March 24, 2014 at 4:41pm

Physics
A diver stands on the end of a diving board as shown in the figure on the right. The mass of the diver is 58 kg and the mass of the uniform diving board is 35 kg. Calculate the magnitudes and directions of the forces exerted on the board at the points A and B. A and B are 1m ...
Monday, March 24, 2014 at 4:39pm

Physics
Water is boiled by burning coal. The resulting steam blows agains huge turbine blades. The turning blades spin in a magnetic field, producing electricity. Describe in order the energy conversions.
Monday, March 24, 2014 at 3:42pm

Physics
A small block on a frictionless surface has a mass of 70 g. It is attached to a massless string passing through a hole in a horizontal surface (see diagram). The block is originally rotating in a circle of radius 45 cm with angular speed 0.80 rad/s. The string is then pulled ...
Monday, March 24, 2014 at 2:56pm

physics
a wheelof diameter 0.70 meterolls without slipping. a point at the top of the wheel moves with a tangential speed of 2.0 meter/second. a) at what speed is the axis of the wheel moving? b) What is the angular speed of the wheel?
Monday, March 24, 2014 at 1:10pm

Physics
Find the total change in the internal energy of a gas that is subjected to the following two-step process. In the first step the gas is made to go through isochoric heating until it gains 5363 J and its pressure is 2.92 105 Pa. In the second step it is subjected to isobaric ...
Monday, March 24, 2014 at 12:42pm

physics
A bookshelf is at rest in a room. A force of 35.0 newtons is applied to a bookshelf. If the floor imparts a frictional force of 2.90 newtons, what is the net force acting on the bookshelf?
Monday, March 24, 2014 at 12:36pm

physics
Consider a toy car that you pullback to make it go forward. Is it a force multiplier or a distance multiplier? Defend your answer with the observations you could make
Monday, March 24, 2014 at 12:06pm

physics
explain the input energy and out put energies of two kitchen machines
Monday, March 24, 2014 at 12:05pm

physics
if you throw a 0.2 kg ball straight up at 8 m/s how high will it go
Monday, March 24, 2014 at 12:05pm

Physics
A wooden crate sits on the floor of a flatbed truck that is initially at rest, and the coefficient of static friction between the crate and the floor of the truck is 0.25. The driver of the truck wants to accelerate to a velocity of 20 m/s within 4.0 s. If he does so, will the...
Monday, March 24, 2014 at 11:19am

Physics
Suppose a sled has a mass of 12 kg and a child is exerting a force of magnitude 200 N. Find the angle q at which the normal force N vanishes. What is happening physically when N = 0?
Monday, March 24, 2014 at 11:19am

Physics
An Atwood's machine consists of two crates of different masses. If the pulley is frictionless and massless along with a string of negligible mass, find the acceleration of the crates and the tension in the string
Monday, March 24, 2014 at 11:18am

physics
A 41.0-kg body is moving in the direction of the positive x axis with a speed of 306 m/s when, owing to an internal explosion, it breaks into three pieces. One part, whose mass is 8.0 kg, moves away from the point of explosion with a speed of 326 m/s along the positive y axis...
Monday, March 24, 2014 at 9:57am

physics
Two pucks collide on an air hockey table. Puck A has a mass of 17.0 g and is initially traveling in the +x direction at 7.00 m/s. Puck B has a mass of 51.0 g and is initially at rest. After the pucks collide, puck A moves away at an angle of 52.0 deg above the +x axis, while ...
Monday, March 24, 2014 at 9:47am

physics
A car moving with an initial speed v collides with a second stationary car that is 46.0 percent as massive. After the collision the first car moves in the same direction as before with a speed that is 37.7 percent of the original speed. Calculate the final speed of the second...
Monday, March 24, 2014 at 9:45am

College Physics
A doubly charged ion is accelerated to an energy of 33.0 keV by the electric field between two parallel conducting plates separated by 1.70 cm. What is the electric field strength between the plates?
Monday, March 24, 2014 at 12:25am

College Physics
The point charges in Figure 17.41 are located at the corners of an equilateral triangle 25.0 cm on a side, where qb = +12.0 µC and qc = -4.50 µC. (Assume that the +x-axis is directed to the right.) (a) Find the electric field at the location of qa. Magnitude ? N/C ...
Monday, March 24, 2014 at 12:18am

college physics
During a circus act, an elderly performer thrills the crowd by catching a cannon ball shot at him. The cannon ball has a mass of 10.0 kg and the horizontal component of its velocity is 8.00 m/s when the 65.0-kg performer catches it. If the performer is on nearly frictionless ...
Monday, March 24, 2014 at 12:10am

Physics
A doubly charged ion is accelerated to an energy of 33.0 keV by the electric field between two parallel conducting plates separated by 1.70 cm. What is the electric field strength between the plates?
Sunday, March 23, 2014 at 11:45pm

physics
during a circus act, an elderly performer thrills the crowd by catching a cannon ball shot at him the ball mass is 10.0 kg and ball velocity is 8 m/s while the performer mass is 65 kg. if the performer is on nearly friction-less roller skates, what is his recoil velocity.
Sunday, March 23, 2014 at 11:35pm

Physics
Two parallel conducting plates are separated by 10.0 cm, and one of them is taken to be at zero volts. (a) What is the electric field strength between them, if the potential 8.50 cm from the zero volt plate (and 1.50 cm from the other) is 540 V? (b) What is the voltage between...
Sunday, March 23, 2014 at 11:35pm

physics
Two charged bodies exert a force of 0.225 N on each other. If they are moved so that they are one-third as far apart, what force is exerted?
Sunday, March 23, 2014 at 10:40pm

physics
A bicyclist wants to make it from one building to the next. The first building he is standing on is 20 m tall. The building he wants to reach is 12 m tall. He is moving at 4 m/s and the gap between both buildings is 5 m. Will he make it? Please just show me how to break down ...
Sunday, March 23, 2014 at 10:35pm

physics
A person has a choice while trying to move a crate across a horizontal pad of concrete: push it at a downward angle of 30 degrees, or pull it at an upward angle of 30 degrees. If the crate has a mass of 50.0 kg and the coefficient of friction between it and the concrete is 0....
Sunday, March 23, 2014 at 9:27pm

physics
train car are coupled together by being bumped into one another. suppose two loaded train cars are moving toward one another, the first having a mass of 150000 kg and velocity of 0.30 m/sand the second havin a mass of 110000 kg and a velocity of (-0.12 m/s). what is their ...
Sunday, March 23, 2014 at 9:05pm

Physics
You have been asked to design a "ballistic spring system" to measure the speed of bullets. A bullet of mass m is fired into a block of mass M. The block, with the embedded bullet, then slides across a frictionless table and collides with a horizontal spring whose ...
Sunday, March 23, 2014 at 8:38pm

physics
Assuming the Earth's magnetic field averages about 0.50×10−4 T near Earth's surface, estimate the total energy stored in this field in the first 15km above Earth's surface. The radius of Earth is 6380 km.
Sunday, March 23, 2014 at 8:15pm

physics
52.(52G) A 110-kg crate, starting from rest, is pulled across a floor with a constant horizontal force of 350 N. For the first 15 m the floor is frictionless, and for the next 15 m the coefficient of friction is 0.30. What is the final speed of the crate?
Sunday, March 23, 2014 at 7:39pm

Physics
Starting with an initial speed of 5.00 m/s at a height of 0.335 m, a 1.75-kg ball swings downward and strikes a 4.40-kg ball that is at rest, as the drawing shows. (a) Using the principle of conservation of mechanical energy, find the speed of the 1.75-kg ball just before ...
Sunday, March 23, 2014 at 7:36pm

physics
A runner is moving at a constant speed of 8.00 m/s around a circular track. If the distance from the runner to the center of the track is 28.2 m, what is the centripetal acceleration of the runner?
Sunday, March 23, 2014 at 7:02pm

Pages: <<Prev | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | Next>>

Search
Members