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A copper sphere 2.5 cm in diameter is used as a slug-type heat-flux meter. A thermocouple is attached to the interior and the transient temperature recorded when the sphere is suddenly exposed to a convection environment. Plot the time response of the system for sudden exposure to an environment with h = 570 W/m2 · ?C. Assume the sphere is initially at 95?C and the environment temperature remains constant at 35?C. What is the time constant of this system?
Air enters a 28-cm diameter pipe steadily at 200 kPa and 20°C with a velocity of 5 m/s. Air is heated as it flows, and leaves the pipe at 180 kPa and 40°C. Determine
A wood beam with cross-sectional dimensions 200 mm × 300 mm is reinforced on its sides by steel plates 12 mm thick (see figure). The moduli of elasticity for the steel and wood are Es= 190 GPa and Ew = 11 GPa, respectively. Also, the corresponding..
consider an acrylic sheet of thickness l 5 mm that is used to coat a hot isothermal metal substrate at th 300 degrees
a wheel of radius r and centroidal radius of gyration k is released from rest and rolls without slipping on the
consider a velocity field of an incompressible flow where the x amp y components of velocity are given by ucx amp v-cy
two particles a and b are travelling around a circle of redius 2m in opposite directions. the velocity of particle a
a 0.5-m3 rigid tank containing hydrogen at 20oc and 400 kpa is connected by a valve to another 0.5-m3rigid tank that
a 100-pound sign is supported at the midpoint of a cable stretched between anchor points that are separated by 86 feet.
In a chemical process the amount of a certain type of impurity in the output is difficult to control is thus a random variable. Speculation is that the population mean amount of the impurity is 0.20 grams per gram of output. It is known that the stan..
The mass of the working fluid is 0.003 kg. The minimum temperature in the cycle is 300 K and the maximum temperature is 900 K. The minimum pressure in the cycle is 20 kPa and the maximum pressure is 2000 kPa. Determine the net work output per cycle.
an ideal cold air-standard brayton cycle engine operates with air entering the compressor at 27 c. the pressure ratio
Water vapor enters a turbine operating at steady state at 1000°F, 140 lbf/in2, with a volumetric flow rate of 12.6 ft3 /s, and expands isentropic ally to 2 lbf/in2. Determine the power developed by the turbine, in hp. Ignore kinetic and potential ene..
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