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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Compare the frictional pressure drop due to the vapor flow to that due to the liquid flow through the wick for a heat pipe using ammonia as the working fluid. Assume that the ratio of dynamic viscosities of ammonia is µI/µV = 3.0, the inside diameter of the wick is 2 cm and the annular area of the wick is 0.65 cm^2. The wick is phosphor-bronze.
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A 60-W light bulb connected to a 120-V source draws a current of
A) 0.25 A. B) 0.5 A. C) 2.0 A. D) 4.0 A. E) more than 4 A.
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What will be an ideal response?
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