A mass of 50. kg is suspended from a steel wire of diameter 1.0 mm and length 11.2 m. How much will the wire stretch? (The Young's modulus for steel is 20 × 1010 N/m2.)
What will be an ideal response?
34.9 mm
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Potential of Point-Charges: Four 2.0-µC point are at the corners of a rectangle with sides of length 3.0 cm and 4.0 cm. What is the electric potential (relative to infinity) at the midpoint of the rectangle? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A. 1.3 MV B. 2.9 MV C. 3.5 MV D. 7.8 MV
A key step in the destruction of ozone by chlorofluorocarbons is
A) the chlorofluorocarbon molecule separates, resulting in free carbon which produces a greenhouse effect. B) the chlorofluorocarbon molecule directly combines with atmospheric ozone. C) carbon atoms react with ozone. D) radiation from the sun separates chlorofluorocarbon, resulting in free chlorine. E) radiation from the sun breaks down O3 molecules.
As the frequency of the ac voltage across an inductor approaches zero, the inductive reactance of that coil
A) approaches zero. B) approaches one. C) approaches infinity. D) becomes negative.
A series circuit consists of three identical lamps connected to a battery as shown in Figure OQ28.15. The switch S, originally open, is closed. What happens to the potential difference across lamp C?