One light-hour is the distance light travels in one hour. The speed of light is about 300,000 km/s . How far is 1 light-hour?
A) 300 thousand km (300,000, or 3 × 105 km)
B) 1.08 billion km (1,080,000,000, or 1.08 ×109 km)
C) 18 million km (18,000,000, or 1.8 × 107 km)
D) 9.46 trillion km (9,460,000,000,000, or 9.46 × 1012 km)
B
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One 20-year-old twin brother takes a space trip with a speed of 0.80c for 30 years according to a clock on his spaceship. At the end of this trip, what are (a) his own age and (b) the age of his Earth-based twin brother?
A) (a) 20 y (b) 30 y B) (a) 30 y (b) 50 y C) (a) 50 y (b) 70 y D) (a) 70 y (b) 90 y
What kind of reactor produces more fissionable fuel than it consumes?
A) AOLA B) LOCA C) moderated D) heavy water E) breeder
The three major processes that heat the interiors of the terrestrial worlds are
A) (1) heat deposited as the planets were built from planetesimals (2) heat deposited as the planets underwent differentiation (3) heat released by radioactive decay. B) (1) heat deposited as the planets were built from planetesimals (2) heat of accretion (3) heat that came from the gravitational potential energy of incoming planetesimals. C) (1) heat of accretion (2) heat from convection (3) heat from thermal radiation. D) (1) volcanism (2) tectonics (3) erosion.
In a certain chemical reaction, 8.1 × 10-19 J of energy is released per molecule formed
What is the difference in mass per molecule between the sum of the masses of the molecules of the reagents before the reaction and the mass of the molecules produced by the reaction? (c = 3.0 × 108 m/s) A) 2.7 × 10-27 kg B) 8.1 × 10-28 kg C) 9.0 × 10-36 kg D) 5.4 × 10-32 kg E) 3.2 × 10-27 kg