Estimation: A reasonable estimate for the duration of a typical physics lecture is
A. 600 s.
B. 1000 s.
C. 3500 s.
D. 10,000 s.
Answer: C
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The rotation curve of a galaxy is displayed as a plot of
a) gravity vs. distance to galaxy center b) rotation velocity vs. distance from Earth c) period of rotation vs. distance from Earth d) redshift vs. blueshift e) rotation velocity vs. distance to galaxy center
Harlow Shapley mapped the Milky Way using the period-luminosity relationship for RR Lyrae stars
Indicate whether the statement is true or false
When material expanding away from a star in a binary system leaves a star's Roche lobe,
a. the material will start to fall back toward the star. b. all of the material will accrete on to the companion. c. the material is no longer gravitationally bound to that star. d. the material will increase in temperature an eventually undergo thermonuclear fusion. e. c and d.
Lenz's Law: The three loops of wire shown in the figure are all hanging in the same uniform magnetic field 
that is perpendicular to the page and does not vary with time. Loop 1 swings back and forth like the bob in a pendulum, Loop 2 rotates about a vertical axis, and Loop 3 oscillates up and down at the end of a spring. Which loop (or loops) will have an emf induced in them?
A. Loop 1 B. Loop 2 C. Loop 3 D. Loops 1 and 3 E. Loops 2 and 3