Question

Two women Seema and Hema each of 60 kg and 80 kg

respectively climb up through a height of 1000cm. Seema takes

25 sec while Hema takes 30 sec to reach. Calculate the

difference in the power expended by Seema and Hema.​

Answer 1

1. Amswer ;

Seema F=1500 N

Seema W=15000 J

Seema P = 600 Js-1

P=0.804hp

2.answer

Hema=2400N

Hema=24000J

Hema=800Js-1

P=1.1hp

Answer 2

Given,

Mass of Seema and Hema = 60kg and 80kg

Height = 1000 cm

Time taken by Seema and Hema = 25sec and 30sec

To find,

The difference in the power expended by Seema and Hema.

Solution,

Firstly, we have to calculate the work done by them.

Height = 1000 cm = 10 m

Seema's work done = (60×10×9.8) = 5880 joules

Hema's work done = (80×10×9.8) = 7840 joules

Seema's expended power = 5880/25 = 235.2 watts

Hema's expended power = 7840/30 = 261.3 watts

Difference = 261.3-235.2 = 26.13 watts

Hence, Hema's expended power is 26.13 watts greater than Seema's expended power.