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An enclosure box surrounds some electronics that draw 25 W of electrical power. For heat transfer we will just consider the biggest wall and ignore other sides, in this case. The wall is a 0.8 mm thick aluminum (kAL = 200 W/m-C), and 200 cm length x 100 cm width. The outside air is at 20 C and the convection coefficient outside, houtside = 200 W/m2-C due to a fan running. For the inside, hinside = 5 W/m2-C. How hot will the inside air get under these conditions?
The mean diameter of a conical friction clutch is 250mm with a width of the conical surface being 50mm. The clutch is lined with a material having a coefficient of friction of 0.25
in an accelerator protons emerge with velocity of 2.5 x 108 ms. the accelerator is 0.8km long.a if the acceleration is
Important information about Pressure Cooker, Steam is leaving a pressure cooker whose operating pressure is 30 psi. It is observed that the amount of liquid in the cooker has decreased by 0.4 gal in 45 minutes after the steady operating conditions..
a 150mm diameter shaft supporting a load of 10kn has a speed of 1500rpm. the shaft runs in a bearing whose length is
two processes are used to produce forgings used in an aircraft wing assembly. of 200 forgings selected from process 1
during actual expansion and compression processes of gases pressure and volume are often related by pvn c where n and
as the hollow steel g 77 gpa shaft shown rotates at 180 rpm a stroboscopic measurement indicates that the angle of
in this piston-cylinder device d1 20 cm-diameter d2 10 cm-diameter and the initial volume of chamber 2 is 0.1 m3.
the 8 kg sack slides down the smooth ramp. if it has a speed of 1.5ms when y.2m. determine the normal reaction the ramp
air was heated by an electric resitance heater in an insulated piston-cylinder device. the piston weight remained
a mass of 0.2 kg of saturated refrigerant-134a is contained in a piston-cylinder device at 200 kpa. initially 75 of the
a 115-v shunt motor develops 21 ib-ft when the armature current is 12 a. as the load on the motor is increased the
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