An AC voltage source, with a peak output of 200 V, is connected to a 25-W resistor. What is the effective (or rms) current in the circuit?
a. 2.8 A
c. 4.0 A
b. 5.7 A
d. 2.0 A
B
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A car is traveling along a highway at 65 mph. What is the linear speed of the top of the tires? What is the linear speed at the bottom of the tires?
What will be an ideal response?
Which kind of star is highly unlikely to be found in the halo of the Milky Way?
A) O star B) G star C) K star D) M star
If nuclear reactions in the core produce harmful gamma rays, why are Earthlings not destroyed?
A: Our super skin protects us. B: We are continually destroyed and then regenerated without knowing it. C: The reactions really produce yellow light, not gamma rays. D: The gamma rays are converted to visible light by the time they reach the photosphere. E: None of the above.
If the speed of an object in circular motion is increased by a factor of 3, its centripetal acceleration for the same radius will be multiplied by a factor of
a. 0.111. b. 0.333. c. 1.73. d. 9. e. 3.