Answer:
Power = 0.46 W
Explanation:
Given data:
distance by which rock lift up is 20 cm
specific gravity of rocks is 4.75
Gravitational acceleration on mars is 3.7 m/sec
Efficiency 40%
we know that specific gravity of rocks
[tex]S.G = \frac{\rho_{rock}}{\rho_{water}}[/tex]
[tex]4.75\times 1000 =\rho_{rock}[/tex]
we know [tex]density = \frac{ mass}{volume}[/tex]
[tex]mass_{rock} = 4.75\times 1000 {\frac{4}{3} \pi (\frac{0.1}{2})^2} = 2.48 kg[/tex]
work done is [tex]W = \frac{mgh}{efficiency}[/tex]
[tex]w = \frac{2.48\times 3.7\times 0.2}{0.4}[/tex]
w = 4.6 j
[tex]so, Power = \frac{w}{t} = \frac{4.6}{10\ sec} = 0.46 W[/tex]
