Of the following photons, which has the lowest energy?
a. visible
c. infrared
b. ultraviolet
d. microwave
D
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Diagram below shows a hypothetical magnetic field in a certain region of empty space where the electric field is constant in time. 
Which of the fields are physically impossible and why?
A. This field violates the Ampere-Maxwell law. B. This field violates Gauss’s law for the magnetic field. C. The field violates both of the above laws. D. This field is physically possible.
Stacy (S) and David (D) are having a tug-of-war by pulling on opposite ends of a 5.0 kg rope. Stacy pulls with a 15. N force. What is David's force if the rope accelerates toward Stacy at 2.0 m/s2?
A) 25 N B) 5 N C) 50 N D) 3 N E) 15 N
The water level in a reservoir is maintained at a constant level. What is the exit velocity in an outlet pipe 3.0 m below the water surface?
A. 2.4 m/s B. 3.0 m/s C. 5.4 m/s D. 7.7 m/s E. 49 m/s
Generally speaking, how does the surface temperature and luminosity of a protostar compare to the surface temperature and luminosity of the main-sequence star it becomes?
A) A main-sequence star is cooler and dimmer than it was as a protostar. B) A main-sequence star is cooler and brighter than it was as a protostar. C) A main-sequence star is hotter and brighter than it was as a protostar. D) A main-sequence star is hotter and dimmer than it was as a protostar.