What can we learn about a star from a life track on an H-R diagram?
A) the star's age
B) the surface temperature and luminosity the star will have at each stage of its life
C) the star's current stage of life
D) how the star's distance from Earth varies at different times in its life
B
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On a clear night you go outside and face south and see circumpolar stars. Then you turn and face north and you see stars rising in the east and setting in the west. Where are you located on Earth?
a. equator b. a mid-latitude between the equator and the north pole c. south pole d. a mid-latitude between the equator and the south pole
When light scatters from a rough surface, the law 
A. does not hold. B. holds on average, with reflected light from the surface leaving in the average direction of reflection. C. applies to each small relatively flat area of surface individually. D. applies only when the particle aspect of light predominates. E. applies only when the wavelength of light is greater than 800 nm but less than 2000 nm.
A ball is dropped from a rooftop of a building and falls for two seconds. The acceleration of gravity is 9.8 m/s2 . The ball is referred to at the two second time. The distance below the rooftop is __________
Fill in the blank(s) with correct word
Answer the following statement(s) true (T) or false (F)
1. Consider an infinite solenoid. Imagine placing a mirror so that mirror’s plane contains the solenoid’s central axis. Such a mirror would satisfy the conditions of the mirror rule. 2. An infinite solenoid’s magnetic field is uniform everywhere in the solenoid’s hollow interior.