A straw is used for a pea shooter. When you blow through the straw the speed of the emerging pea will be greater if the straw is
A) cut in half.
B) full length.
C) either cut in half or full length.
Answer: B
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When we see a crescent moon, the rest of the face that we see is not completely dark because
A) it is partially facing toward the Sun. B) it is slightly illuminated by sunlight reflected by Earth. C) it is slightly illuminated by starlight. D) it is slightly illuminated by the light of Earth's cities.
What is ?min for a monochromatic beam of light of wavelength 600 nm and an aperture diameter of 6.00 mm?
A) 100 × 10-6 rad B) 202 × 10-6 rad C) 122 × 10-6 rad D) 244 × 10-6 rad E) 236 × 10-6 rad
When you stand in front of a convex mirror, the image you see is
A. real and inverted. B. real and upright. C. virtual and inverted. D. virtual and upright. E. real and inverted if your distance from the mirror is greater than two focal lengths.
The average density of the Galilean satellites of Jupiter ________ with increasing distance from the planet.
A. does not change B. increases C. decreases