An arrow is shot, from a bow, at an original speed of vo. When it returns to the same horizontal level, its speed will be
A) 9.8 vo.
B) vo.
C) 2 vo.
D) 1/2 vo.
E) 4 vo.
B
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Which of the following statements best explains why the densities of Uranus and Neptune are higher than that of Saturn, even though Saturn is much more massive?
a They have higher masses. b. They have a higher proportion of hydrogen compounds and rock. c. They have stronger magnetic fields. d. They are at greater distances from the Sun. e. Their interiors are more compressed due to stronger gravity.
A hydraulic press multiplies a force by 100, which is done at the expense of
A) energy, which is divided by 100. B) the distance through which the force acts. C) the time through which the force acts. D) the mechanism providing the force. E) none of the above
Why is Isaac Newton sometimes said to have "united the heavens and Earth"?
A) Because he caused the scientific community to accept the idea that Earth is just one planet orbiting the sun like the other planets. B) Because Newton's law of conservation of energy seems to apply throughout the universe. C) Because he discovered that the energy processes that power the sun also operate on Earth. D) Because Newton's law of gravity seems to apply throughout the universe. E) Because of the fact that there are no exceptions to the laws of thermodynamics.
You can see your image in a mirror because of diffuse reflection
Indicate whether the statement is true or false