Process of Science: Can we ever really know what happens within the event horizon of a black hole?
What will be an ideal response?
No, because no light can escape and we can therefore never make observations and test predictions for what happens within the event horizon.
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Carbon-14 Dating: Carbon-14 decays by ?- emission. What nucleus is left after this decay?
A. carbon-13 B. carbon-14 C. carbon-15 D. nitrogen-14 E. nitrogen-15
In experiments involving the setup shown in figure Q4.1b, the value that the voltmeter displays increases for a short period of time after light starts shining on the cathode, but then quickly settles down to a fixed value. Why? 
A. The cathode eventually stops emitting electrons. B. The kinetic energy of ejected electrons starts out small but quickly reaches a maximum value. C. The charge difference between the cathode and anode is initially small but with time becomes so large that no electron from the cathode can make it to the anode. D. The cathode eventually runs out of electrons to emit. E. Some other explanation (describe).
Which of the following statements about degeneracy pressure is not true?
A) Degeneracy pressure keeps any protostar less than 0.08 solar mass from becoming a true, hydrogen-fusing star. B) Degeneracy pressure can halt gravitational contraction of a star even when no fusion is occurring in the core. C) Degeneracy pressure is a consequence of the laws of quantum mechanics. D) Degeneracy pressure varies with the temperature of the star.
At time t = 0.00 s, a car is traveling along a straight line at a speed of 20 m/s with constant acceleration. The car travels 56.0 m during the time interval between t = 2.00 s and t = 4.00 s. What is the acceleration of the car?
A) 14.0 m/ s2 B) 0.00 m/ s2 C) 7.00 m/ s2 D) 5.33 m/ s2 E) 2.67 m/ s2