If the acceleration vector of an object is directed parallel to the velocity vector,
A) the object is turning.
B) the object is speeding up.
C) the object is slowing down.
D) the object is not moving.
E) this situation would not be physically possible.
B
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Which of the following aging treatments of a precipitation-hardened alloy would be expected to result in the most stable precipitate particles?
(a) As-quenched (b) Under-aged (c) Aged to peak strength (d) Over-aged
What is the basic definition of a black hole?
A) an object with gravity so strong that not even light can escape B) a dead star that has faded from view C) any object made from dark matter D) a compact mass that emits no visible light
A transistor is an example of a
A) resistor. B) superconductor. C) semiconductor. D) dry cell. E) transmitter.
The main reason for positioning many radio telescopes across a large area and combining the signals is
a. to observe more objects in a shorter amount of time. b. provide a backup system if one or more of the telescopes go down. c. to produce higher resolution images. d. to avoid interference between signals from the separate telescopes. e. to account for the motion of objects in the sky as a result of the Earth's rotation.