A series LRC circuit consists of an ac voltage source of amplitude 75.0 V and variable frequency, a 12.5-µF capacitor, a 5.00-mH inductor, and a 35.0-? resistor
(a) To what angular frequency should the ac source be set so that the current amplitude has its largest value? (b) Under the conditions of part (a), what is the maximum current amplitude? (c) Suppose that the voltage source is set to twice the angular frequency needed in part (a). What will be the current amplitude in this case?
(a) 4.00 × 103 rad/s (b) 2.14 A (c) 1.63 A
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What value of n corresponds to a wavelength of 922.7 nm in the Paschen series?
A) 3 B) 15 C) 9 D) 5 E) 7
An uncharged metal sphere is placed on an insulating puck on a frictionless table. While being held parallel to the table, a rod with a charge q is brought close to the sphere, but does not touch it. As the rod is brought in, the sphere
a. remains at rest. b. moves toward the rod. c. moves away from the rod. d. moves perpendicular to the velocity vector of the rod. e. moves upward off the puck.
Imagine that the energy levels of a certain system are proportional to 
, where n = 1, 2, 3, …. Imagine that for some reason, only transitions such that ?n = 1 are physically possible. In a spectrum chart (like the one shown in figure Q11.2) the emission lines produced by this system
A. Get closer together (in energy) as we go to the right.
B. Are evenly spaced (in energy).
C. Get farther apart (in energy) as we go to the right.
A horizontal force of 200 N is applied to a 55-kg cart across a 10 m level surface. If the cart accelerates at 3.0 m/s2, then what is the work done by the force of friction as it acts to retard the motion of the cart?
a. -900 J c. -350 J b. -175 J d. -700 J