Relative Velocity: A swimmer heading directly across a river that is 200 m wide reaches the opposite bank in 6 min 40 s. During this swim, she is swept downstream 480 m. What is the speed of the current?
A. 0.50 m/s
B. 0.80 m/s
C. 1.2 m/s
D. 1.4 m/s
E. 1.8 m/s
Answer: C
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How did Harlow Shapley use the period-luminosity relationship of RR Lyrae variables to determine the size of the Milky Way galaxy?
a. He determined the proper motion of globular clusters in the outer disk of the galaxy. b. He found the distances to individual variables free floating in the halo. c. He found the distances to open clusters found throughout the disk of the galaxy. d. He found the distances to globular clusters distributed about the center of the galaxy.
If, from the point of view of Earth-bound observers, the Moon is in new Moon phase on a particular day, what phase is Earth as seen from the Moon?
What will be an ideal response?
If you focus a store-bought telescope at the full Moon on a typical clear night, the full Moon will be viewed as _________________
a. right-side up b. upside down c. a dot in the sky d. the color red
Suppose that the build-up of fatty tissue on the wall of an artery decreased the radius by 10%. By what percent would the arterial pressure difference produced by the heart have to be increased to maintain a constant blood flow?
A) 48% B) 52% C) 50% D) 46% E) 54%