Practicing Success

Target Exam

CUET

Subject

Physics

Chapter

Current Electricity

Question:

A DC motor is rated at 20 A with a voltage of 115 V. When the motor is running at its maximum power, it can lift an object with a weight of 4900.00 N a distance of 10.00 m, in 30.00 s, at a constant speed.

What is the power used in lifting the object? Ignore air resistance.

Options:

1633.33 W

160.6 W

16.05 W

1213 W

Correct Answer:

1633.33 W

Explanation:

P = FS/t 

F : 4900 N ; S = 10 m ; t = 30 s

P = 4900/3 = 1633.33 W