The most massive main-sequence stars are the M stars
a. True
b. False
Indicate whether the statement is true or false
False
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The correct form of Ampere's law for circuits with gaps in them is
A.
.B.
.C.
.D.
.E.
.What, if any, evidence did Galileo have for the law of inertia?
A) A smooth ball slows down when rolling uphill, and speeds up when rolling downhill, so it should maintain an unchanging speed on a level surface. B) Using a telescope, he observed meteors and comets moving at unchanging velocity through outer space. C) Noting that the length of the year does not change, he concluded that Earth must maintain an unchanging speed when moving around the sun. D) All of the above. E) He didn't have direct evidence, but proposed the law of inertia only because of the known failures of Aristotelian physics.
If a light signal and a radio signal were emitted simultaneously from the Moon, the first signal to reach Earth would be
A) radio. B) light. C) both of these D) none of the above
In a sequence of rock layers we find trilobite fossils at the bottom of rock layer 1 and dinosaur fossils directly above the fossil trilobites in layer 2. There are inclusions of trilobites in layer 2. We conclude that
A) dinosaurs were extinct long before trilobites came into existence. B) dinosaurs are from the Cambrian Period. C) by inclusion and faunal succession, layer 1 is older than layer 2. D) there is no time gap between the rocks.