A wire (length = 2.0 m, diameter = 1.0 mm) has a resistance of 0.45W. What is the resistivity of the material used to make the wire?
a. 5.6 × 10^-7 W × m
b. 1.2 × 10^-7 W × m
c. 1.8 × 10^-7 W × m
d. 2.3 × 10^-7 W × m
e. 7.1 × 10^-7 W × m
C
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Because of their short lifetimes, very few muons that are produced in the upper atmosphere at high speeds should be observed at the surface of the Earth. Yet we detect large numbers of muons at ground level because of
a. time dilation. b. length contraction. c. the equivalence of mass and energy. d. the principle of relativity. e. none of the above.
A 60-W light bulb connected to a 120-V source draws a current of
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What will be an ideal response?