Problem based on electrical energy
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
(b) operating an electric oven for 7.0 h if it carries a current of 20.0 A at 220 V
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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?
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.
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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
Derive the following relationships using the differential equation governing hydrostatic pressure in a fluid. Pressure variation with altitude, Density variation with altitude, and Temperature variation with altitude.
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A high-voltage transmission line with a resistance of 0.31 /km carries a current of 950 A. The line is at a potential of 710 kV at the power station and carries the current to a city located 164 km from the station. (a) What is the power loss due
For the following claim, find the null and alternative hypothesis, test statistic, P-value, critical value, and draw a conclusion. Assume that a simple random sample has been selected from a normally distributed population.
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