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A class of 180 students sits in a lecture theatre for one hour, each student metabolising at 100 W. The lecture theatre is a cubic room ten metres long on each side and ten metres high. The specific heat of air at constant volume is 1 kJ kg-1 K-1 . The density of air is about 1.2 kg m-3 . The initial temperature was 20?C. The ventilation is poor, the air conditioning is broken and the walls are well insulated. What is the room temperature at the end of the lecture? Compare this to the sun, which produces 3.86 × 1026W.
a long stainless steel rod 18 cr 8 ni has a diameter of 6.4 mm. it is initially at a uniform temperature of 25 degc and
a heat pump maintains a dwelling at a temperature tin when the outside temperature tout is 5oc. the heat transfer heat
Matching with shorted/open loads. The transmission line network in Figure 15.32 is given. The shorted transmission line and the open transmission line are part of the network. Show that no stub network will match the two line sections to the main ..
A steady-state, well insulated turbine operated in two stages in series using steam . The first stage has an efficiency of 85% and the second stage 90%. Steam enters the first stage at 400 C degree and 4 MPa and exits at 1.5 MPa.
The die characteristic is Q_x = 0.0015p where p is the head pressure in psi. Determine the flight angle that maximizes the flow rate Q_x and graph it.
part a as shown below a beam is subjected to a distributed load and a moment. the length of the beam is 9.00 the
a cylinder filled with oil is under pressure from a piston. the diameter d of the piston is 48mm and the compressive
Determine the mole fraction of the hydrogen in the mixture, the equivalent molecular mass of the mixture and the total volume occupied by the mixture under the conditions stated.
Calculate the yield stress of the material and the force required to produce yield - determine the bulk modulus of the material.
Explain how you would expect the strength and ductility of a crystalline material to change as the ASTM Grain size number change from 14 to 3.
The object shown is made of thin plate with 0.02 lb/in2 specific weight. Determine the mass moment of inertia about the x axis.
the concrete storage mass needed for a maximum 10°C daily temperature swing.
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