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For a particular radioactive sample, the total counting rate (sample plus background) was 450 cpm, and this value was obtained over a 15.0-min counting period. The background was counted for 2.0 min and gave 7 cpm. Estimate
(a) The corrected counting rate Rc.
(b) The standard deviation associated with the corrected counting rate σRc.
(c) The 95% confidence interval associated with the corrected counting rate.
The outside wall surface of a 25 mm diameter metal tube (k=42 W/m*K) is maintained at 120 C. The tube is located in a room at 25 C and the convective heat transfer coefficient is 34 W/m^2*K. We'd like to increase heat transfer from the tube by adding..
Water flowing at a rate of 3.8 kg/s is heated from 38 to 55 C in the tubes of a shell and tube heat exchanger. The shell side is one pass with water flowing at 1.9 kg/s entering at 94 C. The overall heat transfer coefficient is 1420 W/m^2*K. The aver..
a heat engine absorbs 25 mw from a 400 degree c combustion change and rejects 15 mw to the atmosphere at 30 degrees c.
consider a body of arbitrary shape. if the pressure distribution over the surface of the body is constant e.g.
What is the rate of heat transfer through a wall that is 2 m high by 2.5 m wide? Sketch the temperature distribution
a 2-kg sphere a is moving toward the right at 4 ms when it strikes the end of a 5 kg slender bar b. the coefficient of
a piston cylinder assembly contains a fixed amount of a gas at a given temperature and pressure. for a specified
Compute the total volume V displaced by the chamber - The submersible diving chamber has a total mass of 6.7 Mg including personnel, equipment, and ballast.
a resistance-based thermometer is commonly used in the industry to measure temperature. when the temperature of the
Geoffrey is building an electronic circuit on a breadboard. He needs to supply his circuit with a 1500 ohm resistance. But he does not have any 1500 ohm resistors on hand. All he has is a box of 1000 ohm resistors.
Consider the multi-fluid container that contains fluids of different SGs as shown except for one fluid. Given that the pressure measured by the gage is 15.5 psia and the pressure in the container is 108.55 kpa, calculate specific gravity of the missi..
consider a combined gas-steam power plant. water for the steam cycle is heated in a well-insulated heat exchanger by
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