A spherical air bubble originating from a scuba diver at a depth of 14.0 m has a diameter of 0.8 cm. What will the bubble's diameter be when it reaches the surface? (Assume constant temperature.)
a. 1.9 cm
b. 1.2 cm
c. 1.1 cm
d. 0.9 cm
e. 1.7 cm
c
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What does not happen when an object approaches a black hole?
A: it becomes redder because photons lose energy B: time runs more slowly as it gets closer to the black hole C: it quickly gets sucked in even from a large distance D: it gets stretched out because of tidal forces E: none of the above
Suppose our Sun were suddenly replaced by a supergiant star. Which of the following would be true?
A) The supergiant would appear as large as the full Moon in our sky. B) Earth would fly off into interstellar space. C) The supergiant's surface temperature would be much hotter than the surface temperature of our Sun. D) Earth would be inside the supergiant.
The Planck time is
A) the shortest time that has any physical meaning. B) the time required for pair creation. C) the time it takes for light to travel across--or around--the entire universe. D) the time when the cosmic background radiation originated. E) the time it takes for an electron in an unexcited hydrogen atom to orbit the nucleus one time.
A heater draws 20A when connected to a 110-V line. If the electric power costs 20 cents per kilowatt hour, the cost of running the heater for 10 hours is
A) $0.44. B) $1.10. C) $4.40. D) $11.00. E) none of the above