Exam 7: Linear Momentum

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 velocity of the 6.00 kg object after the collision is

A 3.00 kg mass is located at x = 2.0 cm and y = 4.0 cm.A 3.00 kg mass is located at x = -5.0 cm and y = 2.0 cm.A 4.00 kg mass is located at x = 3.0 cm and y = -3.0 cm.Where is the location of the center of mass (x,y)?

A rifle fires a bullet.Immediately after the bullet is fired,which of the following is NOT true?

Two objects of equal mass hit a wall with the same velocity.They both rebound with the same velocity.Both objects experience the same momentum change but one experiences twice the force as the other.Which of the following statements is true?

A rocket with a mass of 750 grams is launched straight up.It achieves a velocity of 25.00 m/s in 2.00 seconds.The average net force on the rocket is

A ball collides with a second ball at rest.After the collision,the first ball comes to rest and the second ball moves off at the speed of the first ball.In this collision

A 3.00 kg mass and a 4.00 kg mass are released simultaneously.What is the velocity of the center of mass at t = 10 s (ignore air resistance)?

An open box-car has a mass of 30,000 kg and is moving on a level railroad track at 4.00 m/s.1,000 kg of water falls straight down into the box-car.The velocity of the box-car after the water falls into the box-car is

If a 5.00 kg mass is moving EAST at 10.0 m/s and a 15.0 kg mass is moving WEST at 10 m/s,what is the velocity of the center of mass of the pair?

A rocket with a mass of 500 grams is launched straight up.It achieves a velocity of 20.0 m/s in 2.00 seconds.The average thrust force of the engines on the rocket is

A water hose has a flow rate of 3.0 kg/s of water.If the velocity of the water as it leaves the hose is 5.0 m/s,then the force to hold the hose is

A 4.0 kg object is moving at 5.0 m/s NORTH.It strikes a 6.0 kg object at rest.The objects have an elastic collision and move in the NORTH or SOUTH direction.The velocity of the 6.0 kg object after the collision is

A 1,800 kg car is traveling at 20.0 m/s NORTHEAST.The momentum of the car is

A ball of mass 3m at speed v approaches a ball of mass 2m at speed -2v and they are about to collide.After the collision,what is the speed of the center of mass?

A 30.00 kg mass falls from a height of 4.000 m.The momentum of the mass just before it hits the ground is

A ball bearing rolls along a smooth horizontal tabletop,and crashes head-on into a second ball bearing of half its mass.If both ball bearings roll in the x-direction only (either positive or negative)and the initially stationary ball bearing is observed to have a velocity of +2.4 m/s after the collision,what was the initial speed of the first ball bearing?

A 4.00 kg ball is moving at 3.00 m/s to the NORTH and a 5.00 kg ball is moving at 2.00 m/s to the NORTHWEST.The total momentum of the system is

A 10 kg bomb is moving NORTH with a velocity of 4.0 m/s.It explodes into three fragments: a 5.0 kg fragment moving WEST with a speed of 8.0 m/s,a 4.0 kg fragment moving EAST with a speed of 10 m/s,and a third 1.0 kg fragment.What is the velocity of the third fragment?

A 4.00 kg object is moving at 5.00 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 6.00 kg object after the collision is

A 1200 kg car is moving at 5.0 m/s EAST.It strikes an 1800 kg car at rest.The cars have an elastic collision and move in the EAST or WEST direction.The velocity of the 1200 kg car after the collision is