Question

PHYSICS - C3 - PART - II
WORK - POWER - ENER
CLARITY ACHIEVER. V
Im/
11.
[
a) FV
A train is moving with velocity V and a force F is acting on it. The power on it is
b) FV
c) F/V
d) Fpower 2by v
Consider two children, say A and B weigh the same. Both start climbing up a rope separately and
a height of 8m in 15s and 20s respectively and power of person A and B are given by Pa
respectively then
a) P. >P
b) P <P
c) P. =P
d) PZP
pls tell answer for both​

Answer 1

Answer:

$1) \\ power \: = \frac{work}{time} \\ power \: = \frac{force \times displacement}{time} \\ power \: = force \times \frac{displacement}{time} \\ power \: = force \: \times displacement$

$2) \\ given \: masses \: are \: equal \\ power \: = \frac{work}{time} \\ work \: = mgh \\ \\ work \: by \: a \: = mg(8) \\ time \: taken \: by \: a = 15s \\ power \: = \frac{work}{time} \\ power \: = \frac{8mg}{15} \\ \\ work \: by \: b \: = mg(8) \\ time \: taken \: by \: b \: = 20s \\ power \: = \frac{8mg}{20} \\ power \: of \: a \: is \: greater \: than \: power \: of \: b$

HOPE IT HELPS......!