A person has a mass of 45 kg. How much does she weigh on the Moon, where g = 1.62 m/s2?
A) 45 N
B) 73 N
C) 7.4 N
D) 220 N
E) 440 N
B
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At 96°F the saturation density of air is 0.04 kg/m3 . If the weather report says the relative humidity is 90% when the temperature is 96°F, the humidity is 0.036 kg/m3
Indicate whether the statement is true or false
Why is our galaxy called the 'Milky Way?'
A: The term 'Milky Way Galaxy' is derived from the Greek word for milk, and there appeared to be a stream of milk running across the sky. B: A certain candy company paid an insane amount of money to have the entire galaxy named after one of its products. C: The name was chosen during a 1980 International Astronomical Union conference. D: "Milky Way" is a mis-translation of the original Sumerian name which meant "river of tears." E: The name "Milky Way" refers to a mystical treatise written by a stargazing Italian monk during the Renaissance period.
The conservation of energy applies to satellites in
A) circular orbit. B) elliptical orbit. C) both of these D) neither of these
Which of the following properties make flare stars so active?
A) fast rotation rates B) deep convection zones C) convecting cores D) strong stellar winds E) both A and B