Thin film interference is responsible for the colors of
a. bird feathers. b. gasoline spills.
c. soap bubbles. d. all of the above.
d
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The source of electrons lighting an incandescent ac light bulb is
A) the power company. B) the electric outlet. C) atoms in the light-bulb filament. D) the wire leading to the lamp. E) the source voltage.
If a positively charged object is brought near a suspended, positively charged object, the suspended object will be
a. repelled. b. charged more. c. discharged. d. attracted.
What happens to the surface temperature and luminosity when a protostar undergoes convective contraction?
A) Its surface temperature and luminosity increase. B) Its surface temperature remains the same and its luminosity decreases. C) Its surface temperature and luminosity decrease. D) Its surface temperature decreases and its luminosity increases. E) Its surface temperature and luminosity remain the same.
A hoop, a solid sphere, and a solid cylinder each have the same mass, radius, and initial speed and are going up the same inclined plane. Which one goes the farthest?
a. the hoop c. the cylinder b. the sphere d. All go the same distance.