Questions
From what height should an ice block at – 20°C be freely released so that 84 % of its mechanical energy is converted into heat and it just melts as it reaches the ground
(g = 10 ms– 2specific heat of ice is 0.5cal/gm/°C and latent heat of fusion of ice is 80 cal/gm)
detailed solution
Correct option is D
mgh×84100=[m×0.5×[0−(−20)]+m×80]×4.2×103→h = 45 km.Talk to our academic expert!
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An ice block of mass 8 kg is dragged along a rough horizontal surface (=0.4) uniformly through 42 m. If all the heat produced is completely absorbed by block then mass of ice that melts is ( L= 80 cal/gm, g = 10m/s2)
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