What is synchronous rotation?
A. a body's rotation rate that is equal to its parent planet's rotation rate
B. a body's rotation rate that is equal to its orbital period
C. a body's rotation rate that does not change with time
D. a body's rotation rate that changes with orbital distance
Answer: B
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In a smoke detector americium (A = 95) transmutes to neptunium (A = 93) by
A) beta emission. B) alpha emission. C) gamma emission. D) none of the above
One star is emitting mostly visible light, and another star is emitting mostly infrared light. Which star is hotter?
A) The temperature also depends on the radius of the star, so one can't decide based on the information provided. B) Both stars are the same temperature. C) The star emitting visible light. D) The star emitting infrared light.
Why might it be difficult for Earth-like planets to form around Sun-like stars in the inner parts of the disk of our galaxy?
A) any stars would be sucked into the central supermassive black hole B) there would be insufficient amounts of heavy elements C) the stars would be packed together too densely for planets to be stable D) there would be too much harmful radiation
A solid uniform disk of diameter 3.20 m and mass 42 kg rolls without slipping to the bottom of a hill, starting from rest. If the angular speed of the disk is 4.27 rad/s at the bottom, how high did it start on the hill?
A) 3.14 m B) 4.28 m C) 3.57 m D) 2.68 m