In the product A ? B ? C, A has 5 significant figures, B has 2 significant figures, and C has 3 significant figures. How many significant figures does the product have?
A) 2
B) 3
C) 4
D) 5
E) 10
A
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When we say that the Sun is a ball of plasma, we mean that ________
A) the Sun is made of material that acts like a liquid acts on Earth B) the Sun is roughly the same color as blood C) the Sun is made of atoms and molecules D) the Sun consists of gas in which many or most of the atoms are ionized (missing electrons)
What is the purpose of the observatory commonly called LIGO?
A) to detect gravitational waves B) to look for examples of gravitational lensing C) to test the equivalence principle D) to attempt observations of hyperspace
Good tracers of the spiral arms of our galaxy are all I. very old. II. very young. III. very luminous. IV. moving with large radial velocities
a. I & III b. I & IV c. II & III d. II & IV e. I, III, & IV
Suppose we take a disk of radius R and remove the material from r = 0 to r = R, making a hole at the center of the disk. Note that this decreases the mass of the disk. Will the value of ? for the new object be larger, smaller, or the same as that for the original object?
A. The value of ? will be larger for the new object. B. The value of ? will be smaller for the new object. C. The value of ? is the same for both objects. D. We need to know the disk’s thickness to answer.