Unit Test — Unit test Answers
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If 600 J of work is done in 3 s, what is the power? (Power: P = W/t)
A
0.005 WB
200 WC
603 WD
1800 W22
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A gust of wind blowing east pushes against a ball. When will the wind do work on the ball?
A
when the ball moves to the eastB
when the ball moves to the northC
when the ball stays in one placeD
when the ball moves north or south23
The diagram shows a swinging pendulum.
A
The pendulum will slow down and eventually stop moving as the mechanical energy transforms to thermal energy.B
The pendulum will slow down and eventually stop moving as the mechanical energy disappears.C
The pendulum will continue moving at the same speed because mechanical energy is created as the pendulum moves.D
The pendulum will slow down but will not stop moving because some of the mechanical energy is destroyed.24
Pablo prepares to lift a barbell. During which stage of the lift does Pablo do work on the barbell?
A
when he holds the barbell up above his headB
when he applies force to the barbell but has not moved itC
when he lifts the barbell from the floor to his chestD
when he lets go of the barbell and allows it fall to the ground25
Den pushes a desk 400 cm across the floor. He exerts a force of 10 N for 8 s to move the desk.What is his power output? (Power: P = W/t)
A
1.25 WB
5 WC
40 WD
500 WDid you find these answers helpful?
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