A lead bullet of mass 12 g travelling at a speedof 100 ms^(-1)comes to rest in a wooden block. If no heatis taken away by the wood, find the rise in temperature of the wood. (Specific heat of lead = 0.03 calorie/g ""^(@)C.)

A lead bullet of mass 12 g travelling at a speedof 100 ms^(-1)comes to

1.	A lead bullet of mass 12 g travelling at a speedof 100 ms^(-1)comes to rest in a wooden block. If no heatis taken away by the wood, find the rise in temperature of the wood. (Specific heat of lead = 0.03 calorie/g ""^(@)C.)
Answer» Solution :kineticenergy of the bullet= heatgained by the bullet `(1)/(2) mv^(2) = MS Delta t` `Delta t =(v^(2))/(2S) = ((100)^(2))/( 2xx0.03 XX 4.2 xx 1000) = 39.68^(0)C`