A "gravitational slingshot" enables a spacecraft to
A) speed up.
B) slow down.
C) change direction.
D) A and B only
E) A, B, and C
D
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By definition, our Sun has a mass-to-light ratio of 1 solar mass per solar luminosity
Indicate whether the statement is true or false
A solid steel ball is dropped from a great height and when its speed reaches 20 m/s its acceleration downward is 7.35 m/s2 . What would be the terminal velocity in this situation?
a. 80 m/s c. 40 m/s b. 60 m/s d. 20 m/s
What does a breeder reactor do?
a. Produces plutonium from uranium and thereby creates more nuclear fuel than it uses. b. Creates independent chain reactions that then separate from their parents and become new energy sources. c. Uses controlled rates of reaction to conserve nuclear fuel. d. Creates its own neutron bombardment beam out of the neutrons that escape from the uranium as it decays. e. Creates its own control rods out of the lead resulting from uranium decay.
General Questions: You are in a train traveling on a horizontal track and notice that a piece of luggage starts to slide directly toward the front of the train. From this observation, you can conclude that this train is
A. speeding up. B. slowing down. C. changing direction. D. speeding up and changing direction. E. slowing down and changing direction.