Rakesh of mass 50 kg climbs up a stair of 40 steps each 15 cm high in 1 minute and his wife Sulekha of mass 40 kg does the same in 2 minutes
(a) What is the ratio of work done by Rakesh and Sulekha?
(b) Compare the power developed by Rakesh and his wife.
Answers
Answered by
1
Answer:
Work = displacement × force
Answered by
0
Answer:
Given: m
1
=40kgf,m
2
=30kgf,h
1
=h
2
,t
1
=4minutes=4×60sec,t
2
=3minutes=3×60sec
Comparing work done by them:
Work done by girl
Work done by a boy
=
m
2
gh
2
m
1
gh
1
=
m
2
m
1
=
30
40
=4:3
(ii) Comparing power developed by them:
Power developed by girl
Power developed by boy
=
Work done by girl / time taken to climb up the stairs in seconds
Work done by boy / time taken to climb up the stairs in seconds
=
3×60
1800
4×60
2400
=
4×60
2400
×
1800
3×60
=1:1
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