The H-R diagram can plot
A) apparent magnitude versus spectral classes.
B) radius versus luminosity.
C) radius versus mass.
D) temperature versus luminosity.
E) temperature versus mass.
D
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Estimate the time required to heat the center of a 1.5-kg roast in a 163°C oven to 77°C. State your assumptions carefully and compare your results with cooking instructions in a standard cookbook.
GIVEN
FIND
The time required to heat the roast
ASSUMPTIONS
SKETCH
How hot was the universe at time zero?
A) 2.73 K B) 5, 800 K C) 16, 000 K D) 1032 K E) We have no theory capable to addressing this question.
Synchronous rotation is when a moon's rotation period and orbital period are the same
Indicate whether the statement is true or false
The wavelength of a radio wave from an FM station broadcasting at 93.9 megahertz on your radio dial is 0.313 meters
Indicate whether the statement is true or false