Exam 7: Linear Momentum

A 4.00 kg ball is traveling at 3.00 m/s and strikes a wall.The 4.00 kg ball bounces off the wall with a velocity of 4.0 m/s.If the contact with the wall by the ball lasts for 0.10 seconds,then the average force on the ball is

At a carnival game,two balls,identical in mass and radius,are made of steel and of rubber.They are offered as a means of knocking over a bowling pin by throwing them at the pin.If they are thrown with the same speed and hit the same spot on the bowling pin,which is more likely to knock the pin over?

The Earth has a mass of approximately 80 times that of the Moon.The distance between their centers is on average 384000 km.How far from the center of the Earth is the center of mass of the Earth-Moon system?

A sticky hockey puck slides along a frictionless,horizontal ice surface at 75 m/s in the +x direction.It collides with a second sticky puck originally sliding at 25 m/s in the -y direction.They collide totally inelastically.If the first puck has a mass equal to half that of the second,what is the angle of their final velocity vector below the +x direction?

Two objects undergo a collision,and there is no external force on the objects.This means that:

A 4.00 kg object is moving at 5.00 m/s NORTHWEST.It strikes a 6.00 kg that is moving SOUTHWEST at 2.00 m/s.The objects have a completely inelastic (stick together)collision.The kinetic energy lost in the collision is

In any collision

A 1700 kg car travels at 20 m/s WEST and collides with a 2000 kg car traveling EAST.The collision is completely inelastic and they both come to rest.What is the velocity of the 2000 kg car?

A 250 g sticky hockey puck slides along a frictionless,horizontal ice surface at 75 m/s in the +x direction.It collides with a 500 g sticky puck originally sliding at 25 m/s in the -y direction.They collide totally inelastically.How much kinetic energy was lost in this collision?

A 4.00 kg object is moving at 3.00 m/s WEST.It strikes a 6.00 kg that is moving WEST at 2.00 m/s.The objects have a one-dimensional elastic collision in the EAST-WEST direction.The velocity of the 4.00 kg object after the collision is

Two objects collide and stick together.Which of the following is false?

A 1200 kg car is traveling at 4.00 m/s and strikes a wall.The 1200 kg car bounces off the wall with a velocity of 4.00 m/s.If the contact with the wall by the car lasts for 0.100 seconds,then the impulse on the car is

A 4.00 kg object is moving at 5.00 m/s EAST.It strikes a 6.00 kg that is at rest.The objects have an elastic collision.The velocity of the 4.00 kg object after the collision is at an angle of 30.0 degrees SOUTH of EAST.The velocity of the 4.00 kg mass after the collision is

A 3.0 kg object is moving to the right at 4.0 m/s.It collides in a perfectly inelastic collision with a 6.0 kg object moving to the left at 2.0 m/s.What is the total kinetic energy after the collision?

A rocket of length 80 m sits on a launch pad.The center of mass of the rocket is located 32 m above the ground.The rocket is launched to an altitude of 100 km.Where is the location of the center of mass of the total rocket-fuel system at the altitude of 100 km?

A 100 kg mass is blown apart into a 60 kg piece and a 40 kg piece.After the blast,the two masses are moving apart with a relative velocity of 60 m/s.The velocity of the 60 kg mass is

A 90.kg person is sitting in a boat at rest with a mass of 100 kg.In the boat is a stone with a mass of 5.00 kg.The person throws the stone at 4.00 m/s horizontally in the NORTH direction.The velocity of the person and the boat after the throwing of the stone is

If the momentum of a ball is doubled,then the kinetic energy is

A binary star system is composed of two stars (one blue,one red)that orbit a common point: the center of mass of the system.The distances from the stars to the center of mass might be labeled r_blue and r_red.The sum of the masses of the stars is M_blue + M_red = 3.70 $\times$ 10³³ kg.If it is known that r_blue = 2/5 r_red,what is M_red?

A 140 gm baseball with a velocity of 25.0 m/s is hit by a baseball bat and leaves at 30.0 m/s in the opposite direction.If the ball was in contact with the bat for 12.0 ms,what is the average force on the ball?