One _____ equals the distance to an imaginary star that has a parallax of 1 arc second
A) parsec
B) light year
C) astronomical unit
D) kilometer
A
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What process best explains the observed pattern of abundances of elements with atomic numbers between 6 and 20?
A) radioactive decay of nuclei with odd numbers of protons B) fusion reactions with hydrogen nuclei C) fusion reactions with helium nuclei D) fusion reactions with neutrons
A projectile that is fired vertically at 5 km/s from the Earth's surface will
A) go into a circular orbit about Earth. B) go into an elliptical orbit about Earth. C) rise and fall back to Earth's surface. D) none of the above
How fast would a rocket have to move past a ground observer if the latter were to observe a 9.4% length shrinkage in the rocket length? (c = 3.00 × 10^8 m/s)
a. 2.98 × 10^8 m/s b. 2.72 × 10^8 m/s c. 1.27 × 10^8 m/s d. 0.420 × 10^8 m/s e. 0.920 × 10^8 m/s
An 100-g piece of copper, initially at 295°C, is dropped into 250 g of water contained in a 300-g aluminum calorimeter; the water and calorimeter are initially at 10.0°C. What is the final temperature of the system? (Specific heats of copper and aluminum are 0.0920 and 0.215 cal/g•°C, respectively. cw = 1.00 cal/g•°C)
a. 12.8°C c. 18.1°C b. 16.5°C d. 32.1°C