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Hot air at atmospheric pressure and 80oC enters an 8-m long un-insulated square duct of crosssection 0.2mx0.2m and negligible thickness. The duct air passes through the attic of a house at a rate of 0.15m3/s. The duct surface is isothermal at 60oC. Determine the exit temperature of the air and the rate of heat loss from the duct to the attic space. Assume fully-developed flow in the duct throughout.
a rigid 0.75 m3 tank initially contains water at 250oc 50 liquid and 50 vapor by volume. a valve on the bottom of the
a car is traveling at a constant speed of 35 mph. what is the normal component of acceleration of the car at the top of
why use the penalty method for implementing boundary conditions? what are the advantagesdisadvantages of direct versus
one-tenth kilogram of water initially at 3 bar 200c undergoes a process to 15 bar 210c while being rapidly compressed
a driver of a car is repeatedy driving around a roundabout with a diameter of 100feet . the driver is traveling around
steam is flowing in a line at 100 bar. it is flashed out through a valve to 1 bar pressure. the temperature of the
ammonia enters the expansion valve of a refrigeration system at a pressure of 10 bar and a temperature of 248c and
If the maximum temperature in the cycle is not to exceed 2200 K, determine the thermal efficiency and the mean effective pressure.
Find the safe applied torque that can be transmitted by the shaft ABCD, if the maximum shear stress in the hollow section is 47 MPa and G = 82.5 GPa.
determine the instantaneous rate of heat transfer from a 1.5-cm-diameter ball bearing with a surface temperature of 150
steam enters a two-stage adiabatic turbine at 8 mpa and 550ordmc state 1 and is expanded to 2 mpa state 2 in the first
A ball with a mass of 0.25 kg is thrown vertically upward with an initial velocity of 10 m/s. What is the velocity of the ball when it reaches the highest point?
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