In an article in the New York Times,(75) A. Revkin pointed out that: "In the early 1970s, when scientists first reported that CFCs could destroy ozone, some theorized that the effect would be most discernible in the highest reaches of the
atmosphere over the tropics, partly because of the abundance of sunlight." What happened when the experiments were performed? Explain how the conditions mandated this experimental result.
Experiment showed that the effects occurred at the poles, not at the Equator. It
was at the very low temperatures that the ozone depletion occurred because of the chemical
reactivity there.
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Charge of uniform density 90 nC/m3 is distributed throughout the inside of a long nonconducting cylindrical rod (radius = 2.0 cm). Determine the magnitude of the potential difference of point A (2.0 cm from the axis of the rod) and point B (4.0 cm from the axis)
a. 1.9 V b. 1.4 V c. 2.2 V d. 2.8 V e. 4.0 V
Resistor A has twice the resistance of resistor B. When individually connected across a given potential difference, which one dissipates the most power; and when connected in series across the same potential difference, which one dissipates the most power?
a. A, A c. A, B b. B, B d. B, A
A skater rotates quickly on the ice. He pushes his arms out. What happens to his rotational kinetic energy?
1.It increases. 2.It decreases. 3.It stays the same. 4.It is impossible to determine.
Most types of chondrites contain _______________, small bits of glassy rock only a few millimeters across
Fill in the blank(s) with correct word