After their rocket engines shut off, astronauts experience weightlessness in the orbiting Space Shuttle,
A. and they are accelerating because they are actually in free-fall.
B. and they are accelerating because they have constant velocity as they pass overhead.
C. but they cannot accelerate because their rocket engines are shut off.
D. but they are not accelerating, since nothing actually has weight in space.
Answer: A
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Index of Refraction: Light having a speed in vacuum of 3.0 × 108 m/s enters a liquid of refractive index 2.0. In this liquid, its speed will be
A. 6.0 × 108 m/s. B. 3.0 × 108 m/s. C. 1.5 × 108 m/s. D. 0.75 × 108 m/s. E. 0.67 × 108 m/s.
Among discovered meteorites, we have found some with all the following origins except
A) being a fragment from the surface of Mars. B) being a fragment from the surface of the Moon. C) being a fragment from Comet Halley. D) being a fragment of a shattered asteroid.
Which of the following statements about oxidation and reduction reactions is true?
A) More than one electron can be transferred in an oxidation and reduction reaction. B) In a half-reaction, only half of an electron is transferred. C) Only neutral atoms are formed in oxidation and reduction reactions. D) A half-reaction is only used for reduction reactions. E) None of the above are true.
The watt, W, is equivalent to which of the following?
A. A·V
B. C·J
C. C/J
D. A/V
E. 