In general, sound travels faster through:
a) solids than through gases
b) gases than through solids
c) gases than through liquids
d) empty space than through matter
Ans: a) solids than through gases
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A star more luminous than our Sun will have a habitable zone that is
A) narrower and farther from the star than the habitable zone of the Sun B) narrower and closer to the star than the habitable zone of the Sun C) wider and farther from the star than the habitable zone of the Sun D) wider and closer to the star than the habitable zone of the Sun
An object of mass 2.00 kg is held at a position A, a vertical height of 20.0 m above the ground. Point B is 8.00 m directly below A. Neglect air resistance and use g = 10.0 m/s2
(a) What is the speed of the object at position B when it falls from position A? (b) What is the speed of the object just before it touches the ground? (c) What is the ratio of the total energy of the object at position A to position B?
How do the escape velocities for two rockets, the first weighing 20 N and the second weighing 20,000 N compare?
A) The escape velocity for the lighter rocket is smaller than that for the heavier rocket. B) The escape velocity for the lighter rocket is the same as that for the heavier rocket. C) The escape velocity for the lighter rocket is greater than that for the heavier rocket. D) It is impossible to compare the two escape velocities.
Discuss the roles that ammonia, hydrogen sulfide, and methane play in the appearances of the jovian planets
What will be an ideal response?