Test 3 Review

It takes 25 N of force to move a box a distance of 5.25 m. How much work is done on the box ?

• 13.25 m

• 4.76 J

• 131.25 J

• None of the above

If a student uses 10 Newtons of Force to push a chair .25 meters, how much is work is being done?

• 25 m

• 40 m

• 2.5 J

• 40 J

 Work done = Force x _________

If a lion drags his prey 5 meters to his den doing 500 joules of work, how much force did he use?

• 100 meters

• 100 N

• 2500w

• 25 N

Calculate the power for the following problem: w=900 J; t:30 s

• 30 joules

• 30 meters

• 30 watts

• 27,000 watts

Calculate work for the following problem: F: 42 N; d: 2m

• 84 m

• 84 watts

• 21 watts

• 84 Joules

A force of 250 newtons was necessary to lift a rock.  A total of 1,000 joules of work was done.  How far was the rock lifted?

• 4 m

• 25,000 m

• 4 watts

• 25 watts

A book weighing 1.0 newton is lifted 2 meters.  How much work was done?

What is the power of a kitchen blender if it can perform 3,750 joules of work in 15 seconds?

• 250 watts

• .004 watts

• 25 watts

• 40 watts

A set of pulleys is used to lift a piano weighing 1,500 newtons.  The piano lifted 3 meters in 60 seconds  How much power is used?

• 4500 J

• 75 J

• 4500 watts

• 75 watts