A quantity that is a measure of how the velocity of a body changes with time is
A. distance.
B. acceleration.
C. time.
D. speed.
Answer: B
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How do astronomers define the "superforce"?
A) a force connecting electromagnetism with the strong and the weak nuclear forces B) the GUT, with all five forces combined C) the GUT, but with no dark energy added in D) a force connecting gravity and the electroweak force E) a force including only dark energy and gravity
Modern mammals are descendants of
A) birds that were able to survive the impact that wiped out the dinosaurs 65 million years ago B) sea animals that colonized the land after the impact that wiped out the dinosaurs 65 million years ago C) early mammals that lived under the ground that were able to survive the impact that helped to wipe out the dinosaurs 65 million years ago D) early mammals that killed off the dinosaurs
Molecular Speeds: Oxygen molecules are 16 times more massive than hydrogen molecules. At a given temperature, how do their average molecular speeds compare? The oxygen molecules are moving
A. four times faster than the hydrogen molecules.
B. at 1/4 the speed of the hydrogen molecules.
C. sixteen times faster than the hydrogen molecules.
D. at 1/16 the speed of the hydrogen molecules.
E. at 1/
the speed of the hydrogen molecules.
Calculate (0.82 + 0.042) × (4.49 × 10^3), keeping only significant figures
a. 3870.8 c. 3879 b. 3870 d. 3900