Exam 6: Momentum, Impulse, and Collisions

A billiard ball collides in an elastic head-on collision with a second stationary identical ball.After the collision which of the following conditions applies to the first ball?

A rocket has an exhaust speed of 2.5 × 10³ m/s,and produces 7.5 × 10⁵ N of instantaneous thrust.What mass of fuel does the rocket burn each second?

In a partially elastic collision between two objects with unequal mass:

If a two-body collision is not head-on,then we may always assume that:

A cannon of mass 1 300 kg fires a 13.6-kg shell with a velocity of 180 m/s at an angle of 45° above the horizontal.Find the recoil velocity of the cannon across the level ground.

When a collision is perfectly inelastic,then:

A 7.50-kg bowling ball strikes a 5.20-kg pin.The pin flies forward with a velocity of 4.00 m/s;the ball continues forward at 5.50 m/s.What was the original velocity of the ball?

Alex throws a 0.25-kg rubber ball down onto the floor.The ball's speed just before impact is 4.5 m/s,and just after is 2.9 m/s.What is the change in the magnitude of the ball's momentum?

In a two-body collision,if the momentum of the system is conserved,then which of the following best describes the kinetic energy after the collision?

A rocket of total mass M and with burnout mass 0.20M attains a speed of 3 400 m/s after starting from rest in deep space.What is the exhaust velocity of the rocket?

At liftoff,the engines of the Saturn V rocket consumed 12 500 kg/s of fuel and exhausted the combustion products at 2 700 m/s.What was the total upward force (thrust)provided by the engines?

Alex throws a 0.250-kg rubber ball down onto the floor.The ball's speed just before impact is 5.30 m/s,and just after is 3.71 m/s.If the ball is in contact with the floor for 0.028 s,what is the magnitude of the average force applied by the floor on the ball?

A valid unit for momentum is which of the following?

A billiard ball is moving in the x-direction at 30.0 cm/s and strikes another billiard ball moving in the y-direction at 40.0 cm/s.As a result of the collision,the first ball moves at 50.0 cm/s,and the second ball stops.What is the change in kinetic energy of the system as a result of the collision?

Jerome pitches a baseball of mass 0.300 kg.The ball arrives at home plate with a speed of 40.0 m/s and is batted straight back to Jerome with a return speed of 52.0 m/s.What is the magnitude of change in the ball's momentum?

The dimensional equivalent of the quantity impulse in terms of the fundamental quantities (mass,length,time)is which of the following?

A model rocket sits on the launch pad until its fuel is ignited,blasting the rocket upward.During the short time of blast-off,as the ignited fuel goes down,the rocket goes up because:

A car wash nozzle directs a steady stream of water at 1.10 kg/s,with a speed of 30.0 m/s,against a car window.What force does the water exert on the glass? Assume the water does not splash back.

A billiard ball collides in an elastic head-on collision with a second identical ball.What is the kinetic energy of the system after the collision compared to that before collision?

Popeye,of mass 75.0 kg,has just downed a can of spinach.He accelerates quickly and stops Bluto,of mass 650 kg (Bluto is very dense),who is charging in at 15.0 m/s.What was Popeye's speed?