A 0.16 pF parallel-plate capacitor is charged to 10 V. Then the battery is disconnected from the capacitor. When 1.00 × 10^7 electrons are now placed on the negative plate of the capacitor, the voltage between the plates changes by
a. -5.0 V.
b. -1.1 V.
c. 0 V.
d. +1.1 V.
e. +5.0 V.
E
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If a nitrogen atom and a slightly heavier oxygen atom have equal kinetic energies, which has the greater average speed?
A) nitrogen B) oxygen C) both the same D) need more information
A series circuit is a current divider and a parallel circuit is a voltage divider circuit
Indicate whether the statement is true or false
Ellen says that whenever the acceleration is directly proportional to the displacement of an object from its equilibrium position, the motion of the object is simple harmonic motion. Mary says this is true only if the acceleration is opposite in direction to the displacement. Which one, if either, is correct?
a. Ellen, because ?2 is directly proportional to the constant multiplying the displacement and to the mass. b. Ellen, because ?2 is directly proportional to the mass. c. Mary, because ?2 is directly proportional to the constant multiplying the displacement and to the mass. d. Mary, because ?2 is directly proportional to the mass. e. Mary, because the second derivative of an oscillatory function like sin(?t) or cos(?t) is always proportional to the negative of the original function.
A circular disk is rotating about a central axis with an angular velocity which is increasing at a constant rate. Point 1 on the disk is located at a distance r1 from the center of the disk and point 2 on the disk is located at a distance r2 from the center of the disk. If r2 = 2r1, which of the following ratios is the largest? 1 and 2 refer to being at points 1 and 2 in the subscripts below, all
values occurring at the same time. a. ?2/?1 b. ?2/?1 c. ac2/ac1 d. All the ratios are 1 so none is larger.