EM waves in a vacuum travel at a speed
a. of c
b. varying with their wavelength
c. varying with their intensity
d. of 299,792,458 m/s
A, D
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Some type of solar eclipse will happen about
A) every month at new Moon. B) every week at full Moon. C) every month at full Moon. D) about every six months at new Moon. E) every year at new Moon.
A surveyor stands 100 m from the base of a building, and uses a transit to determine that the angle of elevation to the building's roof is 19.0°. If the transit height is 0.80 m, what is the height of the building?
a. 94.6 m b. 95.4 m c. 35.2 m d. 34.4 m
A 10 kg solid cylinder with a 50.0 cm radius has a moment of inertia of 1/2 
If a torque of 2.0 N•m is applied to the object, the angular acceleration is
A. 1.0 
B. 1.6
C. 1.8
D. 2.1
E. 2.3
Which of the following has the largest luminosity?
A: coolest Main Sequence star B: Main Sequence star with the smallest radius C: Main Sequence star with spectral type K D: most massive Main Sequence star E: the Sun