The distance between adjacent galaxies in a typical cluster is about ________ times the size of a typical galaxy
A) two or three
B) five or less
C) ten to twenty
D) a hundred
E) a thousand
B
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What is the primary way in which we determine the mass distribution of a spiral galaxy?
A) We count the number of stars we can see at different distances from the galaxy's center. B) We calculate its mass-to-light ratio. C) We apply Newton's version of Kepler's third law to the orbits of globular clusters in the galaxy's halo. D) We construct its rotation curve by measuring Doppler shifts from gas clouds at different distances from the galaxy's center.
A 650-N billboard worker stands on a 4.00-m scaffold weighing 600 N and supported by vertical ropes at each end. How far would the worker stand from one of the supporting ropes to produce a tension of 660 N in that rope?
a. 1.78 m b. 2.00 m c. 1.90 m d. 0.06 m e. 0.93 m
Two points on a merry-go-round are located at distances from the center r1 and r2, where r1 < r2 . While the merry-go-round is in the process of speeding up to operational speed, which of the following equations involving magnitudes of angular speed, angular acceleration, and tangential speed for these points is incorrect?
a. ?1 = ?2 b. ?1 = ?2 c. vt1 = vt2 d. All of the equations are correct.
Does a shell have to contain electrons in order to exist?
A) A shell is a form of energy that requires electrons in order to exist. B) A shell is just a region of space which may or may not contain electrons. C) A shell is just a conceptual model, hence, it doesn't really exist with or without the electron. D) Two of the above are reasonable answers.