"For every action there is an equal and opposite reaction" is a statement of Newton's
a. law of universal gravitation.
b. first law.
c. second law.
d. third law.
d
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Which of the following describes the most convincing evidence in support of the idea that human activity is causing climate change on Earth?
A) Polls show that a majority of Americans agree that this is the case. B) The vast majority of scientists say so. C) The known science behind the greenhouse effect predicts that warming should be occurring as the carbon dioxide concentration rises, and the average temperature is rising as expected. D) There is no other known process besides the burning of fossil fuels that can lead to any change in Earth's average temperature.
What do we mean when we say that particles such as neutrinos or WIMPs are weakly interacting?
A) They respond to the weak force but not to the electromagnetic force, which means they cannot emit light. B) The light that they emit is so weak that it is undetectable to our telescopes. C) They are only weakly bound by gravity, which means they can fly off and escape from galaxies quite easily. D) They interact with other matter only through the weak force and not through gravity or any other force.
All the following statements are true. Which one follows directly from Kepler's third law?
A) Venus takes longer to rotate than it does to orbit the Sun. B) Venus has a thicker atmosphere than Mercury. C) Venus orbits the Sun at a slower average speed than Mercury. D) Venus is more massive than Mercury.
A 2.0-m long piano string of mass 40 g is under a tension of 338 N. Find the speed with which a wave travels on this string
a. 130 m/s c. 520 m/s b. 260 m/s d. 1040 m/s