During which phase of the Moon can a lunar eclipse occur? During which phase can a solar eclipse occur?
Lunar eclipses occur at the full-moon phase; solar eclipses occur at the new-moon
phase.
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A feature of the nuclear reactor at Chernobyl that contributed to the magnitude of the accident there was that
A. plutonium could build up quickly in the reactor. B. the reactor did not have control rods. C. water was used only as a coolant, not a moderator. D. the uranium fuel was more highly enriched.
Today, the idea that everything is made of atoms should be classified as
A) a certainty. B) a fact. C) Both of the above. D) a theory. E) a hypothesis.
Suppose we put a ball at rest on a rug and then start pulling the rug out from under the ball in a certain direction. The ball rolls without slipping on the rug as the rug moves under it. The friction force that the contact interaction between the rug and ball exerts on the ball does
A. positive work on the ball. B. negative work on the ball. C. no work on the ball.
Most modern aircraft use hydraulics systems to move the control surfaces on the aircraft. This is an example of using Bernoulli's principle
a. True b. False Indicate whether the statement is true or false