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jimmyu wazir Grade:
        a man of mass50 kg is standing on a 100kg plank kept on  a fictionless horizontal floor. initially both are at rest if man starst walking on the  plank with speed 6m/s towards right relative to the plank then amount of muscle  energy spent by the man is!!????
8 years ago

Answers : (2)

Chetan Mandayam Nayakar
312 Points

from principle of conservation of momentum, man and plank move in opposite directions w.r.t. floor with speeds v and u respectively. conservation of momentum implies 50v=100u,v=2u, v+u=6, therefore u=2m/s and v= 4m/s,

Energy= (50/2)42 +(100/2)22 =600 Joule

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7 years ago
askIITians Faculty
164 Points
										Hello Student
Number of Photons emitted , n = 2.5 x 1015
Duration of Source , T = 2 X 10-9 s
Energy of Source . E = nhv = nh/T = 8.3 X 10-10 J
3 years ago
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