The voltage 8.00 sin (400t) is applied to a series RLC circuit, with R = 200 ?, L = 0.100 H, and C = 1.00 ?F. What are the impedance Z and the phase angle ??
a. 200 ?, ?37.0°
b. 566 ?, +87.0°
c. 2470 ?, ?85.4°
d. 2540 ?, ?88.8°
e. 393 ?, ?63.0°
c
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A car is traveling on an interstate where north is taken to be the positive direction. A graph of the distance it has moved as a function of time is shown. What is the physical significance of the slope?
A. The distance the car has moved.
B. The velocity of the car.
C. The acceleration of the car.
An adiabatic free expansion of a gas in a thermally isolated container is not reversible because
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Collisions between galaxies
A) are much rarer than collisions between stars. B) can turn elliptical galaxies into spirals. C) cause large numbers of stars to collide and explode. D) cause the gas and dust clouds to collide, leading to rapid star formation. E) are the best explanation for gamma-ray burst events.
Why is it easier to see fine print in brighter light than in dimmer light?
a. This is not so, it is easier to see fine print in dimmer light than in brighter light. b. Because the refractive power of the eye increases as the light intensity increases. c. In brighter light, the f-number of the eye increases. d. In brighter light, the longer wavelengths dominate.