Luminous (normal) matter makes up approximately what percentage of the known matter in the universe?
A) 15% B) 5% C) 60% D) 95%
A
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Why does the same side of the moon always face Earth?
A. Sometimes the back side of the moon is lit by the sun. B. The moon rotates in the same direction that it revolves and the moon's period of rotation is equal to its orbital period. C. The moon does not rotate. D. The moon rotates in the same direction that it revolves. E. The moon's period of rotation is equal to its orbital period.
Two equal-size vectors at right angles to each other have a resultant that is
A) equal to that of either vector. B) ?2 the length of either vector. C) twice the length of either vector.
Which of the following are the jovian planets?
a) Jupiter, Saturn, Uranus, Neptune b) Earth, Mars, Jupiter, Saturn c) Uranus, Neptune, and Pluto d) Mercury, Jupiter, and Saturn e) Mercury, Venus, Earth, Mars
An astronaut has landed on Planet N-40 and conducts an experiment to determine the free fall acceleration on that planet
She uses a simple pendulum that is 0.640 m long and measures that 10 complete oscillations 26.0 s. What is the free fall acceleration on Planet N-40? A) 4.85 m/s2 B) 1.66 m/s2 C) 3.74 m/s2 D) 2.39 m/s2 E) 9.81 m/s2