In the difference A - B - C, A is accurate to 5 decimal places, B is accurate to 2 decimal places, and C is accurate to 3 decimal places. What is the correct number of decimal places in the difference?
A) 2
B) 3
C) 4
D) 5
E) 0
A
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Suppose the distance to a star was doubled but everything else about the star stayed the same. What would happen to the star's luminosity?
A) It would decrease by a factor of 2. B) It would decrease by a factor of 4. C) It would increase by a factor of 2. D) It would increase by a factor of 4. E) It would remain the same.
Does the existence of quasars imply that radiation can escape ablack hole?
a) No, the emission of radiation occurs before material falls in through the event horizon. b) Yes, the laws of physics break down so that material travels faster than the speedof light near quasars. c) Yes, radiation can escape because the mass of a photon is zero. d) Quasars have nothing to do with black holes. e) Quasars do not produce radiation of any sort, so there is no contradiction.
Which of the following is about as cheap as coal for base-load electric power today?
A) photovoltaic cells B) solar-thermal generation of electricity C) wind turbines D) All of the above. E) None of the above.
An object is thrown downward with an initial (t = 0) speed of 10 m/s from a height of 60 m above the ground. At the same instant (t = 0), a second object is propelled vertically upward from ground level with a speed of 40 m/s. At what height above the ground will the two objects pass each other?
a. 53 m b. 41 m c. 57 m d. 46 m e. 37 m