A resistor R1 is wired to a battery, then resistor R2 is added in series.
(a) Is the potential difference across R1 now more than, less than, or the same as previously?
(b) Is the current i1 through R1 now more than, less than, or the same as previously?
(c) Is the equivalent resistance R12 of R1 and R2 more than, less than, or the same as R1?
A. more than
B. less than
C. same as
Answers: 2
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An ideal otto cycle has a compression ratio of 10.5, takes in air at 90 kpa and 40°c, and is repeated 2500 times per minute. using constant specific heats at room temperature, determine the thermal efficiency of this cycle and the rate of heat input if the cycle is to produce 90 kw of power.
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Beryl states that insulation with the smallest possible thermal conductivity is best to keep a house warm in winter, but worst for keeping a house cool in summer. sapphire insists the reverse is true: low thermal conductivity is good in the summer, but bad in the winter. which one, if either is correct? a. beryl, because low thermal conductivity results in low heat transfer. b. beryl, because low thermal conductivity results in high heat transfer. d. sapphire, because low thermal conductivity results in high heat transfer. e. neither, because low heat transfer is desirable both in summer and in winter.
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A resistor R1 is wired to a battery, then resistor R2 is added in series.
(a) Is the po...
(a) Is the po...
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