Q. $80\ gm$ of water at $30℃$ are poured on a large block of ice at $0℃.$ The mass of ice that melts is
A) $30\ gm$
B) $80\ gm$
C) $1600\ gm$
D) $150\ gm$
Explanation
(a) If $m\ gm$ ice melts then
Heat lost = Heat gain
$80 \times 1 \times (30 - 0) = m \times 80 \Rightarrow m = 30\ gm$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.