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A pressure cooker cooks much faster than an ordinary pan by maintaining a higher pressure and temperature inside. The lid of a pressure cooker is well sealed, and steam can escape only through an opening in the middle of the lid. A separate piece, the petcock, sits on top of this opening and prevents steam from escaping until the pressure force overcomes the weight of the petcock. The periodic escape of the steam in this manner prevents any potentially dangerous pressure build up and keeps the pressure inside at a constant value. Determine the mass of the petcock of a pressure cooker whose operation pressure is 100 kPa gauge and whose opening has a cross-sectional area of 4 mm2. Assume an atmospheric pressure of 101 kPa, and draw the free body diagram of the petcock.
long circular rod passes through the opening in an oven having air temperature of 400 and is pressed firmly onto the
one-half kg of refrigerant-22 is contained in a piston-cylinder assembly initially saturated vapor at 5bar. the
a walk-in cooler using a vapor compression refrigeration cycle is configured as shown below. the cycle uses cfc22 or
Determine the total heat transfer and the total work(kj). and show the T-V diagram.
determine the repeat distance linear density and packing fraction for bcc lithium which has a lattice parameter of
A piston-cylinder device is insulated and contains 0.005 m3 of saturated liquid water at a constant pressure of l50 kPa. An electric resistance heater inside the cylinder is now turned on, and 1800 kJ of energy is transferred to the steam.
A uniform linear charge density of 4 nC/m is distributed along the entire x axis. Consider a spherical (radius = 5 cm) surface centered on the origin. Determine the electric flux through this surface.
rod bde is partially guided by a roller at d which moves in a vertical track. knowing that the instant shown the
two lb of water vapor in a piston cylinder assembly is compressed at a constant pressure of of 250 lbfin2 from a volume
a piston-cylinder device contains 1m3 liquid water of saturated liquid water at 200 c. the water is expanded
When these stops occur, it takes an average of 10.0 min to diagnose the problem and make repairs. Determine (a) line efficiency and (b) average actual production rate.
two spinning discs have the same angular momentum, but disk 1 has more kinetic energy than disk 2. Which one has the bigger moment of inertia - explain your reasoning?
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