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A cylindrical wheel billet 1ft. in diameter and 3ft. long, initially at 1000 F, is quenched in oil. Assume that the surface of the billet is 200 F throughout the quenched; assume that the convective heat transfer coefficient between the oil and the billet surface is very large. The steal has the following properties, which may be assumed independent of temperature: K = 25 Btu/h-ft-F, Cp = 0.11 Btu/lbm-F, p = 490 lbm/ft^3, a(alfa) = 130*10^-6 ft^2/s. Estimate the temperature of the hottest point in the billet after five minutes of quenching. Neglect end effects; make the calculation for a cylinder of the given diameter but of infinite length.
What is the discharge revised discharge pressure of the compressor.
The roof is supported by cables. If the cables exert FAB = 100N and FAC = 120N on the wall hook at A, determine the magnitude of the resultant force acting at A.
Determine the angular velocity of the two 10-kg rods in Fig. 2 when , if they are released from rest in the position . Neglect friction.
Estimate the minimum bar diameter to prevent fatigue failure.
Determine the resultant of the three forces F1 = 2.0i + 3.3j - 2.6k; F2 = - i + 5.2j - 2.9k; and F3 = 8.3i - 6.6j + 5.8k, which are concurrent at the point (2, 2, -5.). The forces are in Newton's and the distances are in meters.
Define- hydraulic mean radius, hydraulic dept, section factor and most efficient dhannel cross section.
Prove that the transformation Q1 = q12 Q2 = q2 sec p2 p cos p2 - 2q2 P= 1 P2 = sin p2 - 2q1 1 2q1 cos p2 is canonical, by any method you choose . Find a suitable generating function that will lead to this transformation.
A vapor-compression heat pump system uses R-134a as the working fluid. The refrigerant enters the compressor at 0.24 Mpa, 0 degrees Celsius, with a volumetric flow rate of 0.6m^3/min. The compression process is adiabatic to 0.9 MPa, 60 degrees Cel..
Plot the moment about B for 320mm
determine the magnitude of the initial velocity of the bullet and the magnitude of the force exerted by the bullet on the block.
Calculate the static thrusts of the rocket and turbojet engine described in the figure. The thrust T is the force necessary to prevent horizontal movement of the engine. Both engines exhaust a mass flow of 40 kg/s.
the friction force acting at the chip-tool interface the main (tengential ) cutting force is 1500N . Find the orthogonal rake angle of the cutting tool?
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