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Answers to questions.
Answers to Email questions about the HW:
Question 1a on the homework: The baseline of the isosceles triangle is the distance between earth in the spring and earth in the fall, 1.5 x 10^8 m x 2. 1b. The power from the star is going everywhere! The power is "smeared" over a huge sphere. Guess what the radius of the sphere is? Hint: Did you get part I?) 3a. In each fusion event in the sun 4 hydrogens are converted into helium. Look in the appendix on page A10 of the book FETU (the units there are atomic mass unit, each is 1.66 x 10^-27 kg). The mass of 4 hydrogens is LARGER than that of 1 helium. Where did the extra energy go? It went into energy!!! (That E=mc^2 thing.) How many such fusion events can there be in the sun? We know the mass of 4 hydrogens. We know the mass of 80% of the sun. The number of events times the energy from each event will give you the available energy. |
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