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Accounting for the variation of specific heats with temperature. Determine: The cutoff ratio The heat rejection per unit mass The thermal efficiency.
A hollow steel shaft (G = 77.2 GPa, allowable stress = 50 MPa, outer diameter = 60 mm. Determine (a) the maximum power that can be transmitted, and (b) the corresponding angle of twist of the shaft.
Design a chain drive for this uniformly loaded system driven by a gasoline engine via a mechanical drive (Service factor is 1.4). Assume that the larger sprocket is to have 80 teeth.
What is the minimum value of the coefficient of static friction µs that will ensure that the block does not slip with respect to the trailer bed?
Determine the fraction of the heat transfer QH discharged at TH provided by (a) the net work input, (b) the heat transfer QC from the cold reservoir TC.
Determine the velocity (m/s) and mass flow rate (kg/s) of the ammonia saturated vapor stream leaving the control volume.
Plot the cost versus r for 2 ≤ r ≤ 10 m, and determine the radius that results in the least cost. Compute the corresponding height h.
Estimate the steady-state heat loss from the pipe (in W/m) when the oil is at 90 degrees Celcius. Ignore the inside thermal resistance.
The convection coefficient is h = 10 W/m2K. Determine the centerline temperature of the beam after an exposure time of t = 6 hours.
The pressure inside the cylinder is held constant at 300 kPa during the process, and a heat loss of 60Kj occurs. Determine the electric energy supplied, in kWh.
The steam is further heated to 400 degrees C. Assume that all the processes are isobaric. Calculate the change in enthalpy in kilocalories and in joules.
The systolic and diastolic pressures of a healthy person are about 120 mm and 80 mm of mercury respectively. Express this pressure in kPa and in meters of water.
Calculate the heat loss rate per meter length of the pipe for insulation thickness values of 0, 0.5, 1, 2, 3, 4, 5 and 6 cm. Plot the results and discuss the variation obtained.
If the pipe is to be insulated with glass wool insulation (k = 0.05 W/m K) in order to decrease the temperature rise of water to 0.25degreeC, determine the required thickness of the insulation.
Calculate the power produced by each turbine, power consumed by each compressor, and the rate of heat rejection. Use constant specific heats at room temperature.
A thermometer placed in the tank indicates the air temperature at the final state is 77 degrees C. Determine (a) the mass of the air that has entered the tank and (b) the amount of heat transfer.
If the rod is 4 long when the springs are compressed 0.5 . and the temperature of the rod is 60, determine the force in the rod when its temperature is 180.
Calculate the overall aerosol mass removal efficiency for the device. If the aerosol concentration is 200 mg/m^3, and the device operates steadily with a flow rate equal to 1.5 m^3/s.
Calculate the mass concentration of the aerosol, the number concentration of the aerosol, and the mass mean particle diameter.
Determine largest load P that can be applied to the beam before it ruptures. the diameter of the strut is 12mm and diameter of the post is 40mm.
A 100Kg pure Iron block at 27 degrees C is dropped into an insulated, rigid tank that contains 0.1m3 of unused engine oil (density of oil = 868.8 kg/m3 ) at 77 degrees C.
Estimate the rate of heat loss due to radiation from a covered pot water 95 C .How does this compare with the 60 W lost due only to convection and conduction losses?
Would it be a possible to use a normal domestic refrigerator as a heat source for a small hot tub or whirlpool? If so, would estimate to be the maximum heating rate.
Find the response of a generic undamped spring-mass system subjected to a square pulse F(t)=F0 for 0≤t<t0 and 0 for t>t0 using the Laplace transform method.