Star A and star B have the same temperature, but star B is more luminous than star A. What can you infer about these two stars?
A) Star A must be bigger.
B) Star B must be bigger.
C) Star A must be redder.
D) Star B must be redder.
E) Nothing can be inferred from the information given.
B
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Slanting Surfaces With Friction: A block of mass m sits at rest on a rough inclined ramp that makes an angle ? with the horizontal. What must be true about normal force F on the block due to the ramp?
A. F > mg B. F > mg cos ? C. F > mg sin ? D. F = mg cos ? E. F = mg sin ?
Two masses are connected by a string which passes over a pulley with negligible mass and friction. One mass hangs vertically and one mass slides on a frictionless 30.0 degrees incline. The vertically hanging mass is 6.00 kg and the mass on the incline is 4.00 kg. The acceleration of the 4.00 kg mass is
A. 2.98 
B. 3.92
C. 5.88
D. 6.86
E. 7.84
Flares and prominences are more numerous during ________
Fill in the blank(s) with correct word
How do we determine the age of an oil deposit?
a. By measuring the amount of uranium that has not decayed into lead. b. By measuring its ratio of carbon-14 to carbon-12. c. By exposing the sample to cosmic rays in the environment to produce carbon-14. d. By calculating the amount of lead that has decayed from uranium. e. By calculating the amount of carbon that has decayed into nitrogen.