A decibel is a measure of a sound's
A) frequency.
B) wavelength.
C) speed.
D) loudness.
E) all of the above
Answer: D
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The rings of Uranus were discovered during ______
a. an occultation of a star by the rings (as well as by the planet) b. during an eclipse of one of the moons by the rings. c. a voyage to Uranus by astronauts d. as Uranus and the rings passed behind Jupiter. e. an encounter by the Voyager 1 space probe.
A monkey is sitting at the top of a tree 20 m above ground level. A person standing on the ground wants to feed the monkey
He uses a bow and arrow to launch the food to the monkey. If the person knows that the monkey is going to drop from the tree at the same instant that the person launches the food, how should the person aim the arrow containing the food? Air resistance is small enough to be ignored. A) He should aim it at the monkey. B) He should aim it below the monkey. C) He should aim it above the monkey.
Nuclei that are all isotopes of an element all have the same
A) number of protons. B) mass. C) number of nucleons. D) number of neutrons.
The P-V diagram of a cyclic process shows a curve that encloses an area. The work done by the heat engine, represented by the enclosed area, is positive when the path around the area proceeds in which of the following fashions?
a. clockwise c. It is always positive. b. counterclockwise d. It is always negative.