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Unformatted text preview: speed. This is mathematically represented by P^2=A^3. d. The rotation period column would indicate the length of a planets day. The first two planets having much longer rotation periods, and the rest of the planets have relatively similar periods. e. I dont 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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- Spring '06