Answer to Question #189191 in Physics for jon

Question #189191

A motor is used to lift a load of 40 N.

The power of the motor is 40 W and the system is 20% efficient. How long does it take the motor to lift the load through 0.50 m?

A. 0.50 s

B. 2.5s

C. 5.0s

D. 25s

Expert's answer

"\\eta Pt=Fs\\\\0.2(40)t=40(0.5)\\\\t=2.5\\ s"

Answer: B. 2.5s

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