Equal amounts of heat are added to equal masses of the four substances listed in the table. All four substances are initially at room temperature. Which
of the substances will have the highest increase in average molecular kinetic
energy?
Substance
air
glass
plastic
wood
Specific heat capacity (kJ/kg•°C)
1.01
0.84
2.60
1.68
A. Glass
B. Air
O O O O
C. Plastic
D. Wood

Total solidification times of three casting geometries are to be compared: a sphere, a cylinder, in which the length-to-diameter ration - 1.0, and a cube. volume = 1000 cm^3 for all three shhapes, and the same casting alloy is used. a) determine the solidification times of each geometry b) based on the results of part (a), which geometric element would make the best riser? c) if the mold constant = 3.5 min/cm^2 in chvorinov's rule, compute the total solidification time for each casting.

Consider an insulating crystal, made up of layers of atoms. what form would you expect the temperature dependence of the phonon heat capacity to approach at extremely low temperatures if the interlayer coupling is i)very strong (rigid coupling), and ii) very weak. explain.

Which accounts for an increase in the temperature of a gas that is kept a constant volume