Kepler's ________ law states that the orbits of planets are elliptical, with the Sun at one focus.
A. First
B. Second
C. Third
D. Fourth
Answer: A
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Albedo equals 0 for a perfectly black object
Indicate whether the statement is true or false
The observed amount of difference between the perihelion of Earth in early January and aphelion in early July results in the northern hemisphere being _____
a. cold in January and hot in July b. hot in January and cold in July c. equally cold in both January and July d. equally hot in bot January and July e. Wrong! The seasonal differences in northern hemisphere temperatures is not caused by differences in distance from the Sun.
Spectroscopy of a star can reveal its temperature, composition, and line-of-sight motion
Indicate whether the statement is true or false
What number of turns on the secondary is needed to reduce the voltage from 120 V to 9.0 V if there are 40 turns on the primary of a step down transformer?
A. 3 B. 9 C. 18 D. 120 E. 530