Why is the sky blue during the day?
What will be an ideal response?
The sky appears blue during the day because small dust particles in the atmosphere scatter blue light more efficiently than red light.
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When it comes near a heavy nucleus, a gamma ray, which is a high energy photon, can "disappear," and in its place there will be produced an electron and a positron, which both have mass. This pair production is an example of
a. time dilation. b. length contraction. c. the equivalence of mass and energy. d. the principle of relativity. e. none of the above.
Brown (155) reports that much toxic material is illegally dumped
Violators have loosened tank-truck valves and dumped contaminants along the road (a New York company spilled out polychlorinated biphenyls—PCBs—from a truck onto 270 mi of North Carolina highway). What are the attitudes of company officials that could tolerate this atrocity? Is indiscriminate dumping a national pastime? Where do you dispose of trash and garbage on long car trips?
A conducting loop in the form of a circle is placed perpendicular to a magnetic field of 0.50 T. If the area of the loop increases at a rate of 3.0 × 10-3 m2 /s, what is the induced emf in the loop?
A) 4.3 mV B) 0 mV C) 1.5 mV D) 1.7 mV E) 5.5 mV
You are holding on to one end of a long string that is fastened to a rigid steel light pole. After producing a wave pulse that was 5 mm high and 4 cm wide, you want to produce a pulse that is 6 cm wide but still 5 mm high. You must move your hand up and down once,
a. the same distance up as before, but take a shorter time. b. the same distance up as before, but take a longer time. c. a smaller distance up, but take a shorter time. d. a greater distance up, but take a longer time. e. a greater distance up, but take the same time.