Exam 4: Work and Energy

Energy provided directly from Earth's interior is called

If you lift a 15-N weight vertically 30 m above the ground,you are

Energy sources that would be nonpolluting supplements to our energy are called ______________ fuels.

A force of 7.2 N acting on a 1.0-kg object initially at rest moves it through a parallel distance of 2.5 m.How much work is done on the object?

An object of mass 2 kg has a speed of 8 m/s and moves a distance of 6 m.What is its kinetic energy in joules?

A student with a 5.0-kg book bag on her way to class climbs two flights of stairs (a 10-m vertical distance)in 15 s.At what rate did the student do work in carrying the book bag up the stairs?

A force of 7.2 N acting on a 1.0-kg object initially at rest moves it through a parallel distance of 2.5 m.Neglecting friction,what is the speed of the object when it is moved 2.5 m? ​

Currently,in the United States,which fuel has the largest consumption?

The kilowatt-hour is a unit of ______________.

A 5.00-kg object is lifted from the floor to a shelf.The object's new gravitational potential energy relative to the floor is 102 J.What is the height of the shelf?

A ball is dropped from an upper-story dorm window.Neglecting air resistance,what is the speed of the ball when it has fallen 2.5 m? ​

In changing from one form to another,energy is always ______________.

A 1000-kg car traveling at 70 m/s takes 3 m to stop under full braking.The same car under similar road conditions,traveling at 140 m/s,takes ______________ m to stop under full braking.

Currently,in the United States,which fuel is utilized to produce the majority of electrical power?

A student weighing 700 N climbs a flight of stairs 5.0 m high.Calculate the work done.

The units of work are the same as those of ______________.

In pushing an object on a level surface,work is done against ______________.

Gravitational potential energy is equal to the ______________ of an object times its height.

Energy resulting from motion is called ______________.

Which of the following is not a unit of power?