If you see the stars and constellations rotating around a point in the night sky in the clockwise direction, you are looking north
a. True
b. False
Indicate whether the statement is true or false
False
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Elementary Particles: How many quarks are in a tritium isotope, 
H?
A. 2 B. 3 C. 4 D. 6 E. 9
A string is attached to the rear-view mirror of a car. A ball is hanging at the other end of the string. The car is driving around in a circle, at a constant speed. Which of the following lists gives all of the forces directly acting on the ball?
A) tension and gravity B) tension C) tension, gravity, and the centripetal force D) tension, gravity, the centripetal force, and friction
Between a pair of equal and opposite charges, field lines are
A) directed from positive to negative. B) more concentrated closer to the charges. C) vectors, with patterns that stem from the inverse-square law. D) all of the above E) none of the above
How do we know that there is much more mass in the halo of our galaxy than in the disk?
A) There are so many globular clusters in the halo that their total mass is greater than the mass of stars in the disk. B) Stars in the outskirts of the Milky Way orbit the galaxy at much higher speeds than we would expect if all the mass were concentrated in the disk. C) Although the question of mass in the halo was long mysterious, we now know it exists because we see so many brown dwarfs in the halo. D) The recent discovery of photinos, combined with theoretical predictions, tells us that there must be a huge mass of photinos in the halo. E) We don't know that there is more mass in the halo; it is only a guess based on theory.