Heat Transfer &...

A brass ball of mass 100 g is heated to 100°C and then dropped into 200g of turpentine oil in a calorimeter at 15°C. Final temperature is found to be 23°C. Take specific heat of brass as 0.092 cal/g°C and water equivalent of calorimeter as 4 g.

Heat lost by the ball and specific heat of the brass is approximately

A brass rod of length 50 cm and diameter 3 mm is joined to a steel rod of the same length and diameter. What is the change in length (in cm) of the combined rod at 250 °C, if the original lengths are at 40 °C ?

Ends of the rods are free to expand.

Co-efficient of linear expansion of brass = 2.0 × 10^–5 K^–1

Co-efficient of linear expansion of Steel = 1.2 × 10^–5 K ^–1

A lead bullet just melts when stopped by an obstacle. Assuming that 25 % of the heat is absorbed by the obstacle, find the velocity of the bullet (in m/sec) if its initial temperature is 27°C.

Melting point of lead = 327 °C, specific heat of lead = 0.03 calories /gm/°C, latent heat of fusion of lead = 6 calories / gm, J = 4.2 joules /calorie