A plane mirror stands vertically on a table. A ruler lies on the table in such a position as to make an angle of 30° with the mirror. Determine the angle between the ruler and its image
60°
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What principle is responsible for light spreading as it passes through a narrow slit?
A) reflection B) refraction C) polarization D) diffraction E) interference
An ore car of mass 2000 kg rolls downhill on tracks from a mine. At the end of the tracks, 10.0 m lower in elevation, is a spring with k = 400,000 N/m. How much is the spring compressed in stopping the ore car? Ignore friction
a. 0.14 m c. 1.40 m b. 0.99 m d. 1.96 m
You have had something simmering in a covered pot on the stove and then turn off the heat. Some time later you return to the pot and find that you have trouble lifting the lid. Why?
What will be an ideal response?
The main source of energy for a star as it grows in size to become a red giant is
A) hydrogen fusion in the central core. B) helium fusion in the central core. C) hydrogen fusion in a shell surrounding the central core. D) gravitational contraction.