A cube at 100.0°C radiates heat at a rate of 80.0 J/s. If the length of each side is cut in half, the rate at which it will now radiate is closest to
A) 56.6 J/s.
B) 40.0 J/s.
C) 28.3 J/s.
D) 20.0 J/s.
E) 10.0 J/s.
D
Physics & Space Science
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A light beam is incident upon a still water surface. What is the maximum possible value for the angle of refraction? (nwater = 1.333)
a. 76.2° b. 67.5° c. 54.4° d. 48.6°
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A sailor drops a wrench from the top of a sailboat's
mast while the boat is moving steadily and rapidly in a straight line. Where will the wrench hit the deck?
1.at the base of the mast 2.behind the mast, along the direction opposite to the motion of the boat 3.in front of the mast, along the direction of the motion of the boat 4.impossible to tell
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Saturn's 1990 white spot had some similarities to Jupiter's Great Red Spot. Discuss some of the similarities and differences. Speculate as to what might cause these
What will be an ideal response?
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A total solar eclipse occurs for people in the Sun's
A) umbra. B) penumbra. C) none of these
Physics & Space Science