From what height must a block of ice dropped into a well so that 5% of it may melt. Given both ice&water at 0C L=80 CAL/G ,J=4.2J/cal, g=980cm/s.

Asked by Pawan chhipa | 23rd Nov, 2012, 05:12: PM

Expert Answer:

at the height , the object possess= mgh=pot energy
just before reaching the ground that fully converts to kinetic energy.
On touching the ground, that energy converts to heat and due to that heat certain portion of it converts to water.
W=JH
mgh=Jm'L.....say m' amount of ice melts.
h=1.68m on putting the values.

Answered by  | 29th Nov, 2012, 04:23: PM

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