Harlow Shapley concluded that the Sun was not in the center of the Milky Way Galaxy by
A) looking at the shape of the "milky band" across the sky.
B) mapping the distribution of stars in the galaxy.
C) mapping the distribution of globular clusters in the galaxy.
D) mapping the distribution of gas clouds in the spiral arms.
E) looking at other nearby spiral galaxies.
C
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Satellite Motion: Suppose our sun had 4 times its present mass but the earth orbited it at the same distance as it presently does. What would be the length of the year on the earth under those conditions?
A. 1/4 as long as the present year B. 1/2 as long as the present year C. the same as the present year D. twice as long as the present year E. four times as long as the present year
Standing Sound Waves: An organ pipe that is 1.75 m long and open at both ends produces sound of frequency 303 Hz when resonating in its second overtone. What is the speed of sound in the room?
Fill in the blank(s) with the appropriate word(s).
Due to its elliptical orbit, Mars is farther from the Sun on average during summer in the Northern Hemisphere. This means Northern Summer on Mars will be
A) long and mild B) short and hot C) long and hot D) short and mild
The electrons in the outermost shell are called ______________ electrons
Fill in the blank(s) with correct word