The Moon has an angular diameter of 0.5°. What is the Moon's angular diameter in minutes of arc?
a. 0.5
b. 30
c. 50
d. 1800
e. 60.5
b
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What is true of the Moon's orbital and rotational periods?
A) The rotational period is longer. B) The orbital period is longer. C) The rotational period varies with the Moon's phase. D) They are equal. E) The orbital period is greatest at full moon.
An 8.0 kg-m2 wheel with 155. Joules of rotational kinetic energy requires what torque to bring it to rest in 4.0 s?
A) -1.6 N-m B) -1.2 N-m C) +0.88 N-m D) -1.8 N-m E) -1.0 N-m
A series circuit consists of ac source, a 90-? resistor, a 0.80-H inductor, and an 80-?F capacitor
The frequency of the source is adjusted so that the capacitive reactance is equal to twice the inductive reactance. What is the frequency of the source? A) 14 Hz B) 13 Hz C) 16 Hz D) 17 Hz E) 19 Hz
A galaxy is observed receding from Earth with a speed of 2800 km/s
If the Hubble constant is 22 km/s per million light-years, estimate how many years ago the light that we presently see from the galaxy actually left the galaxy. (c = 3.00 × 108 m/s, 1 ly = 9.461 × 1015 m, 1 y = 3.156 × 107 s) A) 1.4 × 107 y B) 4.2 × 107 y C) 4.2 × 108 y D) 4.2 × 106 y E) 1.3 × 108 y