Unformatted text preview: speed. This is mathematically represented by P^2=A^3. d. The rotation period column would indicate the length of a planet’s day. The first two planets having much longer rotation periods, and the rest of the planets have relatively similar periods. e. I don’t think Mercury or Jupiter have seasons because their axis tilt is not significant enough to change the amount of sunlight they get which determines the seasons. 49. a. Half life=4.5 bil yrs 55% of 4.5 bil years=2.475 the rock is 2.475 billion years old b. 63% of 4.5 bil years= 2.835 yrs. This rock is .36 billion years older....
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This note was uploaded on 02/08/2011 for the course ASTR 100 taught by Professor Hayes-gehrke during the Spring '06 term at Maryland.
- Spring '06