A person has a mass of 45 kg. How much does she weigh on the Moon, where g = 1.62 m/ s2?
A)
45 N
B)
73 N
C)
7.4 N
D)
220 N
E)
440 N
B
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Does Mercury have an atmosphere? Why or why not?
A. It has only traces of gases temporarily captured from space, as well as material outgassing from the surface. B. Yes, but it is only one-tenth the atmosphere of Venus. C. Astronomers have not been able to tell so far. D. Yes. Mercury has a substantial atmosphere of solar hydrogen and helium.
A defining feature of "pseudoscience" is
A) it is wrong.
B) it does not use proper scientific methodology.
C) Both of the above.
D) it is unusual, or odd.
E) All of the above.
Which of the following statements is true?
A. Even though X-rays have higher energy, they move with the same speed as that of visible light. B. X-rays have higher energy, but still they move slower than visible light. C. X-rays have higher energy, hence they move faster than visible light. D. None of these choices are correct.
When a baseball player hits a ball with a force of 1000 N, the ball exerts a force on the bat of
A) less than 1000 N. B) more than 1000 N. C) 1000 N.