A coole raises a box from ground level to the roof of a bus in one minute. Another cootie does the same
job in two minutes. Which one has more power?
Plz give me the explanation of the answer
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Answer: Work=(Force).(displacement).cosФ
=(Force).(displacement).(cos0)
=(Force).(displacement).(1)
=F.s
Power=Work / time
Case1: When time taken = 1 min = 60s
P1=Work / time = F.s/60
Case2: When time taken = 2min =120s
P2= Work / time = F.s/120
P1:P2=2:1
therefore, power for both the cases is Power=0
Explanation: Work is scalar product of force vector and displacement vector.
which is equal to product of magnitude of force vector , displacement vector and cos of angle between them
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