Which of the following is NOT a situation where disconnecting the power may create an additional or increased hazard?
A. Office with computers
B. Emergency alarm system
C. Life support equipment
D. Ventilation system in a hazardous location
Answer: A
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The heating capacity of a calorimeter is known to be 4 kJ/°C, with negligible uncertainty. The number of dietary calories (kilocalories) per gram of a substance is given by C=cH(?T)/m, where C is the number of dietary calories,H is the heating capacity of the calorimeter, ?T is the increase in temperature in °C caused by burning the substance in the calorimeter, m is the mass of the substance in grams, and c=0.2390 cal/kJ is the conversion factor from kilojoules to dietary calories. An amount of mayonnaise with mass 0.40 ± 0.01 g is burned in a calorimeter. The temperature increase is 2.75 ± 0.02°C.
a. Estimate the number of dietary calories per gram of mayonnaise, and find the uncertainty in the estimate. b. Find the relative uncertainty in the estimated number of dietary calories. c. Which would provide a greater reduction in the uncertainty in C: reducing the uncertainty in the mass to 0.005 g or reducing the uncertainty in ?T to 0.01°C?
Many modern vehicles are equipped with a ____ system that is used to lock and unlock the doors, turn on the interior lights, and release the trunk latch prior to approaching the vehicle.
A. remote keyless entry B. wireless entry C. remote starter D. remote access
Taps can be surface treated by:
A) Tempering B) Anodizing C) Nickel plating D) Nitriding