Thermal Physics
Q = mcΔT Q = mH PE = mgh KE = ½ mv2
1. A 5.0 kg stone is dropped from a height of 2.5 meters onto a
sheet of ice at 0 degrees C. All of the energy goes into
melting the ice. Calculate the mass of ice melted.
2. Convert 30 degrees C to Kelvin.
3. 500 grams of copper at 350 degrees C is dropped into a
calorimeter containing 200 grams of liquid water at 25
degrees C. What will be the equilibrium temperature
assuming no heat is lost to the calorimeter.
4. On the back side of this page sketch a diagram of the
refrigeration cycle including the compressor, evaporator,
condenser and expansion valve.
Describe what happens to the Freon in each of these
components.
5. Fill in the following terms: temperature, kinetic energy,
potential energy, latent heat, specific heat, first law, second
law, conduction, convection and radiation.
In the calorimeter situation described in question
3 the calorimeter isolates the copper and water.
It prevents ___________ by having a vacuum
(no air) between the inner and outer layer of
metal. ___________ is contained by using shiny
metal for the inside surface. Due to the
_________ of thermodynamics we can assume
that all of the heat flowing out of the copper
goes into the water. This will happen because
we know that heat will flow from high
__________to low due to the __________ of
thermodynamics. Some heat will be transferred
through _________ due to the movement of hot
and cold water. The energy transfer in this
process will be _______ not _________because
no phase change occurs. The _________ will
increase but the _________will remain the same.