Fri November 23, 2012 By: Pawan Chhipa

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.

Expert Reply
Thu November 29, 2012
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.
mgh=Jm'L.....say m' amount of ice melts.
h=1.68m on putting the values.
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