1. Review for Test 1

2. Reminders Test #1 is Wednesday, Feb. 10. You are allowed to bring one 8½ x 11 sheet with anything hand-written on it, front and back. Bring a calculator.

3. Clicker Review Questions

4. 1. Which of the following is NOT a postulate of special relativity> A) The speed of light is the same for all observers. B) Time flows more slowly for moving clocks. C) The laws of physics are the same for all observers moving with constant velocity. D) They are ALL postulates of special relativity. E) None of them are postulates of special relativity.

5. 2. Why is the Sun very dense on the inside? A.Denser materials sank to its center. B.Pressure of the overlying gas keeps the density high. C.It formed from dense material. D.Nuclear fusion increases the density in the core by changing hydrogen into helium.

6. 3. Einstein showed that… A.space and time cannot be separated. B.travel faster than the speed of light is possible. C.the overall shape of the universe is spherical. D.the overall shape of the universe is flat.

7. 4. How many fundamental forces are known in nature? A.dozens B.eight C.four D.one

8. 5. Suppose you are traveling in a plane at 900 km/hr. You throw a baseball. Compared to the ground, your throw will take… A.the same amount of effort. B.a lot more effort. C.a little more effort. D.different amounts of effort, depending on which direction you throw it.

9. 6. How does a particle differ from its anti-particle? A.It has opposite mass. B.It has opposite charge. C.Its wave-function is the opposite sign. D.all of the above E.none of the above

10. 7. Which of the following layers of the Sun is densest? A.convection zone B.photosphere C.chromosphere D.corona E.radiation zone

11. 8. If we (on Earth) watched a spaceship go by at 0.99c, we would see the ship’s clocks running slower than ours. What would people on the spaceship see when they compared our clocks to theirs? A.They would see our clocks running faster than theirs. B.They would see our clocks running slower than theirs. C.They would see our clocks running at the same rate as theirs. D.People at the front of the ship would see our clocks running slower than theirs, but the people at the back of the ship would see our clocks running faster than theirs. E.People at the front of the ship would see our clocks running faster than theirs, but the people at the back of the ship would see our clocks running slower than theirs.

12. 9. When the starship Enterprise drops a probe towards the surface of a neutron star (extremely dense – extremely high gravity), they will see the probes clocks running more slowly than their own.. What would Simon, who accidentally rode the probe down towards the neutron star, see when he compared the Enterprises clocks with his wristwatch? A.Simon would see the Enterprise’s clocks running faster than his wristwatch. B.Simon would see the Enterprise’s clocks running slower than his wristwatch. C.Simon would see the Enterprise’s clocks running at the same rate as his wristwatch.

13. 10. The Sun's visible surface, or photosphere, has regions of strong magnetic field called A.granulation. B.magnetic traps. C.magnetic lines. D.sunspots. E.sundogs.

14. Astro-Cash Cab! Derek Colt Pauline Jessica One free shout out

15. 1) Four protons go into the “proton-proton chain” in the Sun. Other than one Helium nucleus, what else comes out?

16. 2) Which of the following is the hottest layer of the Sun’s atmosphere? Corona Core Chromosphere Convection zone Photosphere

17. 3) Neutron stars orbiting closely to each other lose energy over time in the form of ___________________________.

18. 4) What is the special condition that makes Special Relativity special?