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## Homework Statement

1. A bullet travelling at a speed of 360 m s-1 is stopped by a sandbag. Assuming half of the energy of the bullet becomes heat energy that is absorbed by the bullet, calculate the increase in temperature of the bullet. (Specific heat capacity of bullet = 160 J kg-1 C-1)

2. A lead ball of mass 320 g is dropped from a height of 12 m. The collision between the ball and the ground is completely inelastic. Assuming all the energy of the ball goes into heating it, calculate the change in temperature of the ball. (Specific heat capacity of lead = 128 J kg-1 C)

3. Water has a high specific heat capacity. In a water heater system in the bathroom, the flowing water has to be heated up in a short period of time. IN a certain water heater, 1.2kg of water at an initial temperature of 25 celcius passes through the heating coil every 20 x. What is the power heater if the heating system delivers water at a temperature of 40 celcius? (specific heat capacity of water = 4200 J kg-1 C)

## Homework Equations

Q=mc0

## The Attempt at a Solution

Im currently on a revision and i hope someone could help me out with these questions. Guide, steps, and explanation is greatly appreciated.