What is the range of timescales for star formation?
A) from 1 million years for the most massive stars up to 10 million years for the least massive stars
B) from 1 million years for the most massive stars up to 100 million years for the least massive stars
C) from 1 million years for the least massive stars up to 10 million years for the most massive stars
D) from 1 million years for the least massive stars up to 100 million years for the most massive stars
E) about 30 million years for all stars, whatever mass
B
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In the particle model, light is ________.
A. a mix of electric and magnetic energy B. the absence of dark C. a packet of energy moving through space D. a compression wave moving through the air E. a ripple in space-time
The electrical power dissipated in an appliance depends on
a. voltage. b. current. c. resistance. d. all of these.
The percentage by mass of hydrogen in methane, CH4, is about
a. 25%. b. 75%. c. 80%. d. 20%.
A car passes a dip in the road, going first down, then up. At the very bottom of the dip, when the car’s instantaneous velocity is passing through horizontal, how does the magnitude of the normal force on the car compare to the magnitude of the car’s weight?
A. 
B. 
C. 
D. 
E. We do not have enough information to answer.