Question

20) A wheel of circumference 0.30m is driven by an electric motor,
as shown. A rope, fastened at one end to a spring balance, passes over
the wheel and supports a freely hanging load of 100N. When the
wheel is turning at a constant rate of 50 rev s', the balance reading is
20N. What is the output power of the motor?
(a) 0.3kW
(b) 1.2kW
(c) 1.5kW
(d) 1.8kw​

Answer 1

Explanation:

20) A wheel of circumference 0.30m is driven by an electric motor,

as shown. A rope, fastened at one end to a spring balance, passes over

the wheel and supports a freely hanging load of 100N. When the

wheel is turning at a constant rate of 50 rev s', the balance reading is

20N. What is the output power of the motor?

(a) 0.3kW

(b) 1.2kW

(c) 1.5kW

(d) 1.8kw

Answer :-

(c) 1.5kW