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A sphereical interplanetary probe of 0.6-m diameter contains electronics that dissipate 170 W. If the probe surface has an emissivity of 0.85 and the probe does not receive radiation from other surfaces, as , for example, from the sun, what is its surface temperature?
a diesel engine performs 2090 j of mechanical work and discards 4125 j of heat each cycle.a how much heat must be
an insulated cylinder is initially filled with saturated r-134a vapor at a specified pressure. thenbsprefrigerant
A construction crew lifts approximately 560 lb of material several times during a day from a flatbed truck to a 32 ft rooftop. A block and tackle system with 50 lb of effort force is designed to lift the materials.
What load P allow can be supported at the midpoint of the bar if the yield stress in the steel wires is 220 MPa and in the aluminium wire is 80 MPa? A saftey factor of n = 2 is needed.
Water enters a 2 meter diameter pipe at a temperature of 23 deg C. The water leaves the pipe at a temperature of 97 deg C The laminar flow rate is such that the Reynolds number is 800. What is the mass flow rate?
a rigid well insulated container contains 10 kg of water. a motor connected to a paddle wheel is used to stir the water
the system is at rest in the position shown with the 12-lb collar a resting on the spring k 20 lbft when a constant
compare air and helium as cooling media for electronic devices. both fluids must exit through an area of 0.025 m2. the
a lidar laser radar gun is an alternative to the standard radar gun that uses the doppler effect to catch speeders. a
when environmental crews started cleaning up a closed government wwii laboratory they discovered thousands of unlabeled
consider a brayton cycle with the following given data pressure ratio 9.2 air at compressor inlet is at 25 deg f air
Estimate the infiltration flow rate if the window is partially open (assuming the window open area is 2 meter squared).
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