Warm-Up Exercise for lecture 22

Due 8:00 am, Thurs, Nov 13

Physics 105, Fall 2008

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 or
high specific heat.

Thermal energy that is used to melt or freeze something without a temperature change is called:
latent heat
specific heat
thermal mass

Suppose you add an ice cube to a glass of water. True of False: this will always decrease the temperature of the water
True
False

Ralph recently saw a sign while driving that said: "Caution: Bridge freezes before road". He is wondering how that can be the case when the road and the bridge are in thermal contact with each other. Plus, they are both in the same environment. What can you tell him to help him understand?