Which has greater momentum in this photo: the non-moving ship or the kayak moving at the slow speed of 1 meter in ten seconds?
a. The ship because of its overwhelmingly greater mass.
b. The kayak because it has non-zero momentum while the ship at rest must have zero momentum.
c. The momentum of an object is a meaningless concept if an object is not moving, so there is no clear answer to this question.
d. The two momenta cannot be compared, because they point in different directions.
e. Their momenta are equal.
b
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A binary system that looks like the one depicted in this painting should shine brightly in x-rays. Which one of the four labeled regions is the source of most of the x-rays?
A) Region I B) Region II C) Region III D) Region IV
Scientists today do not accept the Ptolemaic model because
A) it is ancient history. B) it was too complicated, compared to Copernicus' heliocentric model. C) it has been shown that Ptolemy faked his data. D) it had no explanation for retrograde motion. E) the work of Tycho and Kepler showed the heliocentric model was more accurate.
In order to control a nuclear reactor, control rods can be pulled out of or pushed into the reactor core by remote control. These rods control the reactor by
a. slowing down the fast neutrons so the neutrons can be absorbed by 238U. b. speeding up slow neutrons so the neutrons can be absorbed by 238U. c. slowing down fast neutrons so they cannot initiate further fusion reactions in 235U. d. speeding up fast neutrons so they cannot initiate further fusion reactions in 235U. e. capturing thermal neutrons so they cannot initiate further fission reactions in 235U.
Which of the following best describes nuclear forces?