Question

A man weighing 60 kg lifts a body of 20 kg to the height of 10 meters in 3 minute

Answer 1

Question:

A man weighing 60 kg lifts a body of 20 kg to the height of 10 meters in 3 minute?

Answer:

Given:

◆ Weight = 60 kg

◆ Mass = 10 kg

◆ Height = 10 m

Solution:

Input power is the power produced by man to reach the top of the building along with the body

◆ Input power = (M + m)gh/t

Output power is the power required to take the body to top of the building

◆ Output power = mgh/t

Effeciency = (Output power / Input power) × 100

= [ (mgh/t) / ((M + m)gh/t)] × 100

= [m / (M + m)] × 100

= [15 kg / (60 kg + 15 kg)] × 100

= 20%

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