What is the best description of the Earth's rotation over its entire history?
A) It has periodically reversed directions, as the magnetic polarity reversals show.
B) It has been constant over the entire history of the solar system.
C) It undergoes abrupt changes, as the magnetic variations show.
D) It has slowed down very gradually at about .0015 seconds per century.
E) It has sped up at about .013 seconds per century.
D
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A pendulum with a bob of mass 150 g has the same period as a thin rod (not massless) of the same mass and length 17 cm when the rod is pivoted about its end. What is the length of the pendulum?
A. 12 cm B. 15 cm C. 22 cm D. 27 cm
The current in two identical light bulbs connected in series is 0.25 A. The voltage across both bulbs is 110 V. The resistance of a single light bulb is
A) 22 ohms. B) 44 ohms. C) 220 ohms. D) 440 ohms. E) none of the above
Electrons come in discrete units of well defined mass and charge, but they also have wave properties
Indicate whether the statement is true or false
A solid disk is released from rest and rolls without slipping down an inclined plane that makes an angle of 25.0° with the horizontal. What is the speed of the disk after it has rolled 3.00 m, measured along the plane?
A) 2.04 m/s B) 3.53 m/s C) 4.07 m/s D) 5.71 m/s E) 6.29 m/s