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Warm-Up Exercise for lecture 21

Due 8:00 am, Tues, 10 Nov 2009

Physics 105, Fall 2009

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Did you complete the reading assignment? (Typically this means at least 20-30 minutes looking over the assigned sections of the book.)
yes no

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?

The comments in the next next two boxes go into a big, mostly anonymous text file that I skim through before the morning lecture, using the comments to help me plan class discussion. ("Mostly anonymous", because I can track down who made what comment, but it takes some effort on my part to do so.) Therefore, if you really want to make sure I see your question/comment and answer it individually, you should send it to me via email and not through this form.

Which part of today's assignment was particularly hard or confusing? What would you like to spend extra time on in class?

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