Power Problems

While rowing across the lake during a race, John does 3960 J of work on the oars in 60 seconds. What is his power output?

• 56W

• 100W

• 66W

• None of the answers are correct

In just one second, a certain coal-fired power plant produces enough electricity to do 900 J of work. What is the power output of this power plant?

• 1 W

• 833 W

• 66 W

• 900 MW

If you increase your work and decrease your time, you will have

• more power

• less power

• same amount of power

• power rating can not be determined

The unit of power was named after...

• James Watt

• Isaac Newton

• James Joule

• Renee Descartes

Power is a measure of how much ______ can be done in a set amount of ______.

• Work, Time

• Work, Energy

• Energy, Force

• Force, Work

A light bulb consumes 100 Watts. If it is left on for 20 seconds, how much work does it do?

• 5 J

• 2,000 J

• 0.2 J

• 100 J

Tags

NGSS.HS-PS3-1

What is the formula for Power?

• E=mc²

• W= F x d

• P = W/T

A person weighing 600 N gets on an elevator. The elevator lifts the person 6 m in 10 seconds.  How much power was used?

• 360 W 

• 60 W

• 3600 W

• 600 W

Tags

NGSS.MS-PS3-4

We can calculate power by

• multiplying work and time

• dividing work by time

• multiplying force and work

• dividing force by work

An engine does 300 J of work in 10 seconds. How much power did it use?

• 3000 N

• 3000 W

• 30 W

• 30 J