hw2 - Astro 102/104 Name Our Solar System Spring 2008...

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Astro 102/104 Our Solar System Spring 2008 Name: Section: Homework 2: Newton’s Laws, Kepler’s laws, Seasons, and a review of the Celestial Sphere Due: In your section the week of February 4 th . Be neat and concise, show your work, and remember units. An answer without the correct units is wrong. 1. (2 points) Mass and weight . The Mars Exploration Rover Spirit has a mass of 185 kg. The SI unit of force is the Newton, written as N. 1 N = 1 kg m/s 2 . Look at Appendix E (Planetary Data) in your book for help with part b). a) What did Spirit weigh when she was on Earth (after she was fully assembled)? b) What does she weigh on Mars? 2. (2 points) Newton’s laws . Given a constant force F: a) What happens to the acceleration if you double the mass? b) What happens to the acceleration if you halve the mass? 3. (1 point) Seasons . Why is it warmer in summer and colder in winter?
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4. (3 points) Astronomical time . a)
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hw2 - Astro 102/104 Name Our Solar System Spring 2008...

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