Questions
From what height a piece of ice at zero degree fall in order that it may melt on reaching the ground, assuming no loss of energy on the way : (J = 4.2 J / cal)
detailed solution
Correct option is A
Let m be mass of ice block and h be the height above the ground.∴Work done W = mgh.Heat produced Q=WJ=mghJHeat required to melt ice block Q’ = mL∴mghJ=mLh=JLg=4.2×80×1039.8=3.4×104m=3.4×106cmTalk 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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