Paper 2 Thermal Physics A Drills

Q1 Calorimetry

A $0.150\mathrm{kg}$ metal block at $95.0^{\circ }\mathrm{C}$ is placed in $0.250\mathrm{kg}$ of water at $22.0^{\circ }\mathrm{C}$. Final temperature is $28.5^{\circ }\mathrm{C}$. Take $c_w=4200\mathrm{J}\mathrm{k}{\mathrm{g}}^{-1}{\mathrm{K}}^{-1}$ and neglect losses.

1. Calculate energy gained by water. [2]
2. Calculate the specific heat capacity of the metal. [3]
3. State one reason the real value may differ. [1]

Q2 Heating curve

A $0.080\mathrm{kg}$ sample is heated at constant power $45\mathrm{W}$. It melts at constant temperature for $160\mathrm{s}$.

1. Calculate energy supplied during melting. [2]
2. Calculate specific latent heat of fusion. [2]
3. Explain why the temperature is constant during melting. [2]

Q3 Electrical specific heat capacity

An immersion heater supplies $12.0\mathrm{V}$ and $3.20\mathrm{A}$ for $240\mathrm{s}$ to $0.520\mathrm{kg}$ of liquid. Temperature rises by $15.0\mathrm{K}$.

1. Calculate electrical energy supplied. [2]
2. Calculate the apparent specific heat capacity. [2]
3. Explain the effect of heat loss on the result. [2]