# College Physics Study Set 7

Physics & Astronomy

## Quiz 5 :Energy

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

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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?
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C

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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?
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D

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Which of the following is an example of a nonconservative force?
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Which of the following is that form of energy associated with an object's location in a conservative force field?
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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?
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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?
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What is the kinetic energy of a 0.135-kg baseball thrown at 40.0 m/s (90.0 mph)?
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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?
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Rupel pushes a box 5.00 m by applying a 25.0-N horizontal force.What work does she do?
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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:
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If both mass and velocity of a ball are tripled, the kinetic energy is increased by a factor of:
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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?
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The work done by static friction can be:
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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?
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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?
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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?
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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?
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