Honors Physics

# Questions - Week 14

1. What is the name of Einstein's theory of gravity?
2. How well does Einstein's theory of gravity work at the atomic level?
3. What was Copernicus' role in the history of astronomy?
4. What was Ptolemy's role in the history of astronomy?
5. What was Kepler's role in the history of astronomy?
6. Newton's theory of gravity was hugely successful mathematically, but it had a couple of major philosophical problems. What were they?
7. How hard would Jupiter pull on someone standing on Earth? Assume the mass of the person is 75 kg. The mass of Jupiter is 1.9(1027) kg, and its closest distance from Earth is 6.3(1010) m. Calculate the gravity in Newtons and in pounds. 1.0 N = 0.22 pounds.
8. Invent a planet with a radius of 1.74(103) km and a mass of 7.35(1022) kg. If you were to drop something on this planet, how quickly would it accelerate toward the ground? In other words, find g.
9. The diagram below shows four people standing in a line. Person A has a mass of 75 kg, person B has a mass of 65 kg, person X has a mass of 85 kg, and person C has a mass of 55 kg. Find the total gravitational pull from persons A, B and C on person X.
10. Imagine a square, 1.25 m on each side. At each corner is a 75 kg mass. Calculate the gravitational force acting on the lower left corner.
11. Mass one is 75 kg, mass two is 85 kg, and mass three is 95 kg. Find the gravitational pull on mass one from masses two and three.
12. What is the difference between astronomy and astrology?