The "drive force" that pushes a car forward is
A) actually zero whenever the car has no acceleration.
B) exerted by the road pushing forward against the tires.
C) exerted by the road pushing upward against the tires.
D) exerted by the engine pushing forward against the axle.
E) exerted by the engine pushing backward against the axle.
B
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A parallel plate capacitor is charged to voltage V and then disconnected from the battery. Leopold says that the voltage will decrease if the plates are pulled apart. Gerhardt says that the voltage will remain the same. Which one, if either, is correct, and why?
A. Gerhardt, because the maximum voltage is determined by the battery. B. Gerhardt, because the charge per unit area on the plates does not change. C. Leopold, because charge is transferred from one plate to the other when the plates are separated. D. Leopold, because the force each plate exerts on the other decreases when the plates are pulled apart. E. Neither, because the voltage increases when the plates are pulled apart.
A 10.0-?F capacitor is plugged into a 110 V-rms 60.0-Hz voltage source, with an ammeter in series. What is the rms value of the current through the capacitor?
a. 0.202 A (rms) b. 0.415 A (rms) c. 0.626 A (rms) d. 0.838 A (rms) e. 0.066 A (rms)
The force of gravity acts on all apples on an apple tree. Some apples are twice as far from the ground. Such twice-as-high apples of the same mass, have
A) 1/4 the weight. B) 1/2 the weight. C) practically the same weight.
When 1.000 kg of ice melts,
J/kg of heat are needed. What is the entropy change in the melting process?
A. 758.0 J/K B. 1,227 J/K C. 1,684 J/K D. 2,316 J/K