The graph of position versus time is given for a train. What can you say about the train’s motion from time t1 to time t2?
A. it is moving with constant velocity
B. it is not moving
C. it is moving with a constant negative velocity
D. it is accelerating
B. it is not moving, since the position value (x) stays the same.
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What is the angular speed of a record that rotates at 33-1/3 rpm?
A) 1.74 rad/s B) 33.3? rad/s C) 33.3/? rad/s D) 3.49 rad/s E) 2.77 rad/s
A rock is rolled in the sand. It starts at 5.0 m/s, moves in a straight line for a distance of 6.0 m, and then stops. What is the magnitude of the average acceleration?
a. 2.1 m/s2 b. 4.2 m/s2 c. 5.4 m/s2 d. 6.2 m/s2
These objects are no longer considered a good explanation for the dark matter in the halo
A) WIMPs B) MACHOs C) black holes D) clouds of cool, neutral hydrogen E) brown dwarfs
Which of the following combinations of circuit components can be used to make a tuner for a radio, to select the desired frequency?
a. fixed inductor, variable resistor b. fixed resistor, variable inductor c. fixed inductor, variable capacitor d. fixed capacitor, variable resistor