The R-value of a piece of material goes up if the material is
a. thicker
b. a better conductor
c. covering a larger area
d. thinner
a
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What will be an ideal response?
If excess charge is put on a spherical conductor,
A) it remains where it was placed B) it spreads a little from where it was placed but not over the whole sphere C) it spreads uniformly over the surface of the sphere if the sphere is small D) it spreads uniformly throughout the volume of the conductor E) it spreads uniformly over the surface of the sphere
Two identical circuits have a capacitor in series with a resistor. In circuit A, the resistor has resistance R, while in circuit B, its resistance is 4R. The capacitors are identical. Each capacitor begins fully charged, and each circuit is open. When each circuit is connected (i.e. the switch in them is closed) the capacitor will fully discharge. If a time t is required for circuit A’s capacitor to fully discharge, what time will be required for circuit B’s capacitor to do the same?
A. 4t B. 0.5t C. 0.25t D. t E. 2t
If you toss a ball straight upward at 40 m/s, with no air resistance it returns to you at a speed of
A) zero. B) 10 m/s. C) 40 m/s. D) more than 40 m/s.