The main difference between a fog and a cloud is
A) water vapor content.
B) density of vapor.
C) seeding.
D) altitude.
E) temperature.
Answer: D
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Which of the following is a difference between medium-mass stars and massive stars?
A) Unlike medium-mass stars, massive stars can get hot enough to ignite carbon fusion. B) Unlike medium-mass stars, massive stars consume the hydrogen in their cores. C) Unlike medium-mass stars, massive stars ignite hydrogen shells. D) Unlike medium-mass stars, massive stars can become giants or supergiants.
A thermodynamic process that happens very quickly tends to be:
a. isobaric. c. isovolumetric. b. isothermal. d. adiabatic.
In a location where the train tracks run parallel to a road, a high speed train traveling at 60 m/s passes a car traveling at 30 m/s in the opposite direction. How long does it take for the train to be 180 m away from the car?
a. 2.0 s b. 3.0 s c. 6.0 s d. 9.0 s e. 18.0 s
According to the theory of relativity, is everything relative?
A) No, lightspeed is not relative. B) No, time and space are not relative. C) No, mass is not relative. D) No, velocity is not relative. E) Yes.