Why don't we expect to find life on planets orbiting high-mass stars?
A) The lifetime of a high-mass star is too short.
B) The stars are too hot to allow for life.
C) Planets cannot have stable orbits around high-mass stars.
D) The high-mass stars emit too much ultraviolet radiation.
A) The lifetime of a high-mass star is too short.
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Which is true about cold dark matter?
a) Cold dark matter interacts strongly with ordinary baryonic matter via the strong force. b) Cold dark matter particles travel faster than the speed of light. c) Cold dark matter particles travel more slowly than hot dark matter particles. d) Cold dark matter exists only within planets and stars but not in other parts of galaxiesor intergalactic space. e) Cold dark matter emits X-rays, but no other forms of radiation.
Which of the choices below correctly lists things in order from largest to smallest?
A) Sun, Earth, Solar System, Milky Way, Universe B) Universe, Milky Way, Sun, Earth, Solar System C) Solar System, Earth, Sun, Universe, Milky Way D) Universe, Milky Way, Solar System, Sun, Earth E) Milky Way, Universe, Solar System, Sun, Earth
A 0.30-kg rock is swung in a circular path and in a vertical plane on a 0.25-m-length string. At the top of the path, the angular speed is 12.0 rad/s. What is the tension in the string at that point?
a. 7.9 N b. 16 N c. 18 N d. 83 N
When water of mass m and specific heat c is heated from absolute temperature T1 to absolute temperature T2, its change in entropy is
a. cm ln(T2/T1) b. cm (T2/T1) c. cm (T2 - T1)/T1 d. cm (T2 - T1)/T2 e. cm (T2 - T1)/(T2 + T1)