A resistance temperature detector (RTD) provides a resistance output R that is related to temperature by: 87. R=Ro[1+ a(T'- To)] where R= resistance, Ro = reference resistance, 100 2 a = linear coefficient of resistance, 0.3925 × 10-3/°C T= temperature, °C To = reference temperature, 0°C The uncertainty, Ur, may be calculated from the simplified Kline-McClintock equation: ´ƏR UT ƏT where UR and Ur are the uncertainties in variables R and T, respectively. The resistance of the RTD, R, is 1102, and this measured value has an uncertainty UR = + 0.1 N. The uncertainty in T'is most nearly:

An electric hot water heater consumes 3.1 kilowatts of electricity and converts it to heat. How long will it take the water heater to heat a 67 gallon tank of water from 10 degrees Celsius to 50 degrees Celsius? (1 kilogram of water is 0.37 gallons, 1 Calorie = 4200 J).  It may be helpful to refer back to the weekly handout for guidance on this problem. Your final answer should be in minutes (rounded to the nearest 10 minutes).

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Projects A and B are mutually exclusive. The minimum attractive rate of return (MARR) is 12%. Using rate of return analysis, which project should be selected? If the image fails to load here, go to https://www.dropbox.com/s/ld6wctqieu8jgwp/ROR.jpg Year 0 1 2 3 4 ROR A - $750 $200 $200 $200 $600 17.68% B - $1,150 $300 $350 $400 $700 16.44% O Project A O Project B O Both Project A and B O Select none of the project. O Insufficient information to make a decision. B-A - $400 $100 $150 $200 $100 13.69%