When an object is hanging on the end of a vertical spring and oscillating up and down, which of these is a period?
a. The same as a cycle.
b. Its journey from the highest point it can reach to the lowest point it can reach.
c. The time the object takes to travel from any point it can reach back to the same point.
d. The time the object takes to travel from its highest point to its lowest point.
e. The time the object takes to travel from the highest point to the lowest and back to the highest.
e
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The free-fall contraction of a molecular cloud
a. can be initiated by shock waves from supernovae. b. can be initiated by nearby spectral type G stars. c. can be initiated by the rotation of the cloud. d. causes the cloud to become transparent to ultraviolet radiation. e. causes the particles in the cloud to decrease the speed with which they move.
Unstable conditions and stormy weather can be expected with the passage of a
A) low pressure system. B) high pressure system.
When cottonseed oil (a liquid) is hydrogenated, the solid fat called ______________ is obtained
Fill in the blank(s) with correct word
Einstein's theory of relativity tells us that travelers who make a high-speed trip to a distant star and back will
A) age less than people who stay behind on Earth. B) age more than people who stay behind on Earth. C) have more fun than people who stay behind on Earth. D) never be able to make the trip within their lifetimes.