Understanding Power in Physics

What is the SI unit of power?

• Meter

• Watt

• Newton

• Joule

How is power related to work and time?

• Power is time divided by work

• Power is work divided by time

• Power is the product of work and time

• Power is the sum of work and time

If the amount of work done is doubled, what happens to the power?

• Power is quadrupled

• Power is doubled

• Power remains the same

• Power is halved

What is the alternate formula for power involving velocity?

• Power = Velocity / Force

• Power = Velocity x Displacement

• Power = Force x Velocity

• Power = Force / Velocity

In a one-dimensional power problem, which of the following is true?

• Power is only proportional to time

• Power is only proportional to force

• Power is independent of displacement

• Power is proportional to both force and displacement

What is the average power required to raise a 2000 kg elevator 30 meters in 10 seconds?

• 58,800 Watts

• 19,600 Watts

• 30,000 Watts

• 10,000 Watts

If an elevator moves at a constant speed, what is the relationship between the applied force and the weight of the elevator?

• Applied force is greater than the weight

• Applied force equals the weight

• Applied force is independent of the weight

• Applied force is less than the weight

How much power in watts is required to maintain a velocity of 3 m/s for a 2000 kg elevator?

• 19,600 Watts

• 58,800 Watts

• 6,000 Watts

• 3,000 Watts

What is the horsepower of a motorcycle engine delivering a 1500 Newton force at 25 m/s?

• 75 horsepower

• 50 horsepower

• 100 horsepower

• 25 horsepower

How many watts are equivalent to one horsepower?

• 1500 Watts

• 500 Watts

• 1000 Watts

• 746 Watts