A parcel of warmed air rises due to
A) random molecular motion.
B) radiation.
C) buoyancy.
D) increased energy of its molecules.
Answer: C
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Indicate whether the statement is true or false
Precession is
A) when the elliptical orbits of planets slip forward with each revolution. B) the process of planetary evolution. C) the stage before planets stabilize into a stationary orbit. D) the wobbling of a planet's axis of rotation.
A two-slit arrangement with 60.3 ?m separation between the slits is illuminated with coherent light. If a viewing screen is located 2.14 m from the slits,
find the distance from the first dark fringe on one side of the central maximum to the second dark fringe on the other side. A) 52.3 mm B) 34.9 mm C) 69.7 mm D) 24.6 mm
If the average density of matter and energy in the Universe is more than the critical density, space-time will be _____
A) closed B) flat C) open D) infinite