Quarks come in how many flavors?
A. 2
B. 3
C. 4
D. 5
E. 6
E. 6
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What is the Oort cloud?
A. the glowing light around a meteor as it burns up B. a region in the outer Solar System from which comets come C. the gas boiled off a comet that forms its tail D. a zone between the Sun and Mercury where comets burn up and release their gases E. gas around a comet's head
A pendulum clock has a pendulum shaft made of aluminum which has a coefficient of linear expansion of 24.0 × 10-6 K-1. At 22°C the period of swing of the pendulum is 1.00 s
If the temperature is reduced to 5°C, how much time does the clock gain or lose in one day? A) It gains 18 s per day. B) It loses 18 s per day. C) It gains 9.0 s per day. D) It loses 9.0 s per day. E) It neither gains nor loses time.
Astronaut Mark Uri is space-traveling from planet X to planet Y at a speed of 0.65c relative to the planets, which are at rest relative to each other
When he is precisely halfway between the planets, a distance of 1.0 light-hour from each one as measured in the planet frame, nuclear devices are detonated on both planets. The explosions are simultaneous in Mark's frame. What is the difference in the time of arrival of the flashes from the explosions as observed by Mark? A) 0 min B) 180 min C) 90 min D) 360 min E) 113 min
A space satellite weighs 100,000 newtons on Earth. When orbiting at a height of 6000 km [one Earth-radius] above Earth, its weight is
A) zero. B) 25,000 newtons. C) 50,000 newtons. D) 400,000 newtons. E) 100,000 newtons.