College Physics Study Set 7

The unit of work, joule, is dimensionally the same as:

A horizontal force of 100 N is applied to move a 45-kg cart across a 9.0-m level surface.What work is done by the 100-N force?

If during a given physical process the only force acting on an object is friction, which of the following must be assumed in regard to the object's kinetic energy?

Which of the following is an example of a nonconservative force?

Which of the following is that form of energy associated with an object's location in a conservative force field?

A very light cart holding a 300-N box is moved at constant velocity across a 15-m level surface.What is the net work done in the process?

A golf ball hits a wall and bounces back at 3/4 the original speed.What part of the original kinetic energy of the ball did it lose in the collision?

What is the kinetic energy of a 0.135-kg baseball thrown at 40.0 m/s (90.0 mph)?

A horizontal force of 200 N is applied to a 55-kg cart across a 10-m level surface.If the cart accelerates at 2.0 m/s², then what is the work done by the force of friction as it acts to retard the motion of the cart?

Rupel pushes a box 5.00 m by applying a 25.0-N horizontal force.What work does she do?

A satellite is held in orbit by a 2 000-N gravitational force.Each time the satellite completes an orbit of circumference 80 000 km, the work done on it by gravity is:

If both mass and velocity of a ball are tripled, the kinetic energy is increased by a factor of:

A rock is thrown straight up with an initial velocity of 15.0 m/s.Ignore energy lost to air friction.How high will the rock rise?

The work done by static friction can be:

What is the minimum amount of energy required for an 80-kg climber carrying a 20-kg pack to climb Mt.Everest, 8 850 m high?

I use a rope 2.00 m long to swing a 10.0-kg weight around my head.The tension in the rope is 20.0 N.In half a revolution how much work is done by the rope on the weight?

A 1 200-kg automobile moving at 25 m/s has the brakes applied with a deceleration of 8.0 m/s².How far does the car travel before it stops?

A worker pushes a sled with a force of 40 N over a level distance of 6.0 m.If a frictional force of 24 N acts on the wheelbarrow in a direction opposite to that of the worker, what net work is done on the wheelbarrow?

Which of the following is that form of energy associated with an object's motion?

A 7.00-kg bowling ball falls from a 2.00-m shelf.Just before hitting the floor, what will be its kinetic energy? (g = 9.80 m/s² and assume air resistance is negligible)