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# 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!!????

Chetan Mandayam Nayakar
312 Points
11 years ago

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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Gaurav
askIITians Faculty 164 Points
6 years ago
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