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Nitrogen at atmospheric pressure is to be heated from 60°F to 120°F in smooth-walled tubes whose inside walls are maintained at 140°F. If the inner diameter is I in. and the average velocity of the nitrogen is 28 ft/sec, what is the required tube length? If a shorter tube is required to accomplish the same degree of heating for the same volumetric flow rate, should the tube diameter be smaller or larger than
in.?
1 a highway patrol officer on the ground uses a radar gun to measure the speed of a suspects car to be 60 ms. a patrol
two blocks of rubber with a modulus of rigidity g 5 12 mpa are bonded to rigid supports and to a plate ab. knowing that
An induction machine is connected to a 60-Hz supply. The no-load rotor speed is 1200 rpm. The machine is driven mechanically to a speed of 1250 rpm.
if the density of air is 1.2 kgm3 at the inlet and 1.05 kgm3 at the exit determine the percent increase in the velocity
Calculate the concentration of quinine in parts per million in the sample
An inventor claims to have developed a device that executes a power cycle while operating between reservoirs at 500 and 300 K that has a thermal efficiency of (a) 45%, (b) 40%, (c) 35%. Evaluate the claim for each case.
a 250 mm bar of 15mm x 30 mm rectangular cross-section consists of two aluminum layers which are 5 mm thick each brazed
nitrogen gas at 60 kpa and 7deg c enters an adiabatic diffuser steadily with a velocity of 275 ms and leaves at 85 kpa
Air flows isentropic ally at the rate of 1 kg/s through a converging-diverging nozzle. The stagnation temperature is 310 K and the stagnation pressure is 810 kPa. If the exit pressure is 101.3 kPa, determine: The throat area. The exit Mach number.
Determine the current through the capacitor just before and just after the switch is closed in Figure P5.23. Assume steady-state conditions for t 0.
the system is released from rest with no slack in the cable and with the spring stretched 100 mm. determine the
helium at 68 degrees farenheit and 14.7 psia in a large tank flows steadily and isentropically thorugh a converging
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