MHT CET20244 May 2024Evening ShiftPhysicsThermal Properties of MatterActual
A lead bullet moving with velocity ' v ' strikes a wall and stops. If 50 % of its energy is converted into heat, then the increase in temperature is ( s = specific heat of lead)
Options
- Av^2 s 2 J
- Bv ^2 4 ~sJ
- Cv ^2 ~s ~J
- D2 v ^2 ~Js
Correct answer
B. v ^2 4 ~sJ
Step-by-step solution
Energy converted to heat =50 % of K.E. array ll & E= 1 2 mv ^2 ( 50 100 )= 1 4 mv ^2 & Heat, Q = ms ~T & ~J = Mechanical equivalent of heat = W Q & ~J = 1 4 mv ^2 ~ms ~T & ~T = v ^2 4 Js array