A lead bullet of mass 21 g travelling at a speed of 100m//s comes to rest in a wooden block . If no heat is taken away by the wood , the rise in temperature of the bullet in the wood nearly is (specified heat of lead =30 cal//kg^(@)C )

A lead bullet of mass 21 g travelling at a speed of 100m//s comes to r

1.	A lead bullet of mass 21 g travelling at a speed of 100m//s comes to rest in a wooden block . If no heat is taken away by the wood , the rise in temperature of the bullet in the wood nearly is (specified heat of lead =30 cal//kg^(@)C )
Answer» Solution :Kinetic energy of the BULLET=heat gained by the bullet `1/2 mv^(2) = msDeltat` `Delta t =(v^(2))/(2S) = ((100^(2)))/(2xx0.03xx4.2xx1000) = 39.68^(@)C`