Two 100 W lightbulbs are to be connected to a 120 V source. What is the current, potential difference, and dissipated power for each when they are connected:
(a) in parallel (the normal arrangement)?
(b) in series?
(a) 0.83 A in each; 120 V; 100 W each, 200 W total.
(b) 0.42 A in each; 60 V; 25 W each, 50 W total.
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a. constant acceleration. b. constant velocity. c. both of the above d. none of the above
An artificial satellite moves at a steady 25,000 km/hr in a circular orbit around Earth. Is it accelerated?
A) Yes, because its speed is changing. B) Yes, because its direction of motion is changing. C) No, because its speed is unchanging. D) No, because its direction of motion is unchanging. E) No, for both reasons C and D.
Ultraviolet radiation cannot be used for solar cells because its energy is too low
What will be an ideal response?
According to special relativity, two events that occur simultaneously in one frame of reference
A) are also simultaneous in all frames of reference. B) can be non-simultaneous in another frame of reference. C) is evidence for the constant speed of light. D) are in reality non-simultaneous.