What is the temperature coefficient of resistivity
A wire 3.00 m long and 0.450 mm2 in cross-sectional area has a resistance of 38 at 20°C. If its resistance increases to 38.3 at 28.0°C, what is the temperature coefficient of resistivity?
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A proton beam in an accelerator carries a current of 115 µA. If the beam is incident on a target, how many protons strike the target in a period of 22.0 s?
You get to choose between two envelopes, each of which contains a check for some positive amount of money. Unlike in the two-envelope paradox, it is not given that one envelope contains twice as much money as the other envelope.
A person notices a mild shock if the current along a path through the thumb and index finger exceeds 80 µA. Compare the maximum possible voltage without shock across the thumb and index finger with a dry-skin resistance of 4.0 105 and a wet-
Before 1918, approximately 60% of the wolves in the New Mexico and Arizona region were male, and 40% were female. However, cattle ranchers in this area have made a determined effort to exterminate wolves.
A clinical trial tests a method designed to increase the probability of conceiving a girl. In the study 290 babies were born, and 261 of them were girls. Use the sample data to construct a 99% confidence interval estimate of the percentage of girl
What is the longest beam you can make that does not yield while supporting only its own weight. Assume that shear stresses on the cross section are negligible compared to (normal) stresses due to bending.
A compound having an approximate molar mass of 120-15 g has the following percent composition bymass: carbon, 38.44%; hydrogen, 4.839%;chlorine, 56.73%.
If electrical energy costs 12 cents, or $0.12, per kilowatt-hour, then what would the following events cost? (a) burning a 120 W light bulb for 24 h straight
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