The half-life of uranium-232 is 70 years. The time for 3/4 of a sample of uranium-232 to decay is
a. 35 years.
b. 70 years.
c. 125 years.
d. 140 years.
e. none of the above.
d
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The ancient goal of astrology was to
A) understand the origin of Earth. B) make a more accurate model of the universe. C) predict the passing of the seasons. D) predict human events. E) antagonize astronomers.
The radiation given off by the nucleus of an atom is called
a. a microwave. b. a gamma ray. c. an X-ray. d. any of these.
A runaway railroad car, with mass 30 × 10^4 kg, coasts across a level track at 2.0 m/s when it collides with a spring-loaded bumper at the end of the track. If the spring constant of the bumper is 4.0 × 10^6 N/m, what is the maximum compression of the spring during the collision? (Assume the collision is elastic.)
a. 0.77 m c. 0.34 m b. 0.55 m d. 1.07 m
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.