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10). If you are now moving through space at a speed of 45 km/s, acquired over a distance of 1.5 X 108 m while accelerating at a constant rate of 0.1 g, what was your original speed? 11). A star that took 20 days to rotate once collapses into a white dwarf that takes 6 hours to rotate once. If the white dwarf's radius is equal to that of Earth (Appendix C), what was the original radius of the star? The mass is unchanged and is 1.2 Msun. Treat the white dwarf as a solid sphere. 12). You have a rocket/spaceship (m= 10 kg) that you want to leave Earth with an total acceleration of 0.5 g. If the fuel exhaust velocity is 1.8 km/s, what is the minimum mass loss per second that you need to have? 13). How much energy are you radiating per m² of your skin? Assume you have a standard body temperature and that human skin has an emissivity of 0.98. If you were heated up to the temperature of Betelgeuse (3000 K), how much more energy would you radiate per m??

11). A star that took 20 days to rotate once collapses into a white dwarf that takes 6 hours to rotate once. If the white dwarf's radius is equal to that of Earth (Appendix C), what was the original radius of the star? The mass is unchanged and is 1.2 Msun. Treat the white dwarf as a solid sphere.