Warm-Up Exercise for lecture 21

Due 8:00 am, Tues, 10 Nov 2009

Physics 105, Fall 2009

An ideal gas has a mixture of heavy and light molecules at the same temperature. The molecules with the most KE are:
heavy
light
same

The fact that desert sand is very hot in the day and very cold at night is evidence that sand has a:
low specific heat
high specific heat

Thermal energy that is used to melt or freeze something is called:
latent heat
specific heat
thermal mass

Ralph's professor stated "If you add an ice cube to a glass of water, the temperature of the water does not necessarily decrease." That seems bizarre to him, because ice is obviously used to cool down water! Can you help him understand what his professor may have been talking about?