Ten questions. The result tells you which lessons you may skip.
How much heat warms \(0.5\,\text{kg}\) of water from \(20\,\text{°C}\) to \(60\,\text{°C}\)? Take \(c = 4200\,\text{J/(kg K)}\).
Water falls \(100\,\text{m}\) and all its potential energy becomes heat in the water. Take \(g = 10\,\text{m/s}^2\) and \(c = 4200\,\text{J/(kg K)}\). Its temperature rises by about
An aluminium pan of mass \(500\,\text{g}\) has \(c = 900\,\text{J/(kg K)}\). Its water equivalent is about
How much heat melts \(200\,\text{g}\) of ice at \(0\,\text{°C}\)? Take \(L_f = 3.34 \times 10^5\,\text{J/kg}\).
While ice melts at \(0\,\text{°C}\), the heat taken in
Food cooks faster in a pressure cooker because
Ice is heated at a steady rate until it has all boiled away. Which part of the heating curve is longest?
\(0.1\,\text{kg}\) of ice at \(0\,\text{°C}\) is heated by a \(250\,\text{W}\) heater. Take \(L_f = 3.34 \times 10^5\,\text{J/kg}\). How long does the melting plateau last?
Equal masses of water at \(20\,\text{°C}\) and \(50\,\text{°C}\) are mixed in an insulated flask. The final temperature is
\(50\,\text{g}\) of ice at \(0\,\text{°C}\) is put into \(100\,\text{g}\) of water at \(60\,\text{°C}\). Take \(c = 4200\,\text{J/(kg K)}\) and \(L_f = 3.34 \times 10^5\,\text{J/kg}\). The final state is