Is it possible for the driver of a car to accelerate the car without pressing on the accelerator?
A) Yes, by pressing on the brake.
B) Yes, by both of the above methods.
C) Yes, by turning the steering wheel.
D) No, because the only way to speed up is to press on the accelerator.
E) No, because of the way that we define the word "acceleration" in physics.
B
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During nuclear fusion, four hydrogen nuclei fuse into how many helium?
a. one b. eight c. three d. four e. two
Why do we see essentially the same face of the Moon at all times?
A) because the other face points toward us only at new moon, when we can't see the Moon B) because the Moon does not rotate C) because the Moon's rotational and orbital periods are equal D) because the Sun illuminates only one half of the Moon at a time E) because the Moon has a nearly circular orbit around Earth
Which of statement below about black holes is not true?
A) Although we are not 100% certain that black holes exist, we have strong observational evidence in favor of their existence. B) If you watch someone else fall into a black hole, you will never see him (or her) cross the event horizon; you'll only see him fade from view as the light he emits or reflects becomes more and more redshifted. C) A spaceship passing near a 10-solar-mass black hole is much more likely to be destroyed than a spaceship passing at the same distance from the center of a 10-solar-mass main-sequence star. D) If you fell into a black hole, you would experience time to be running normally as you plunged rapidly across the event horizon.
Including relativistic effects, doubling the speed of a object:
a. has no effect on its momentum. c. less than doubles its momentum. b. more than doubles its momentum. d. doubles its momentum.