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Repeat Problem 7.15 where the vertical shaft is 10 mm in diameter.
Problem 7.15
The vertical drive shaft in Figure P2.31 is 20 mm in diameter, 650 mm long, and made of steel. The motor to which it is attached at the top is equivalent to a steel flywheel 300 mm in diameter and 25 mm thick. When the vertical shaft is rotating at 3000 rpm, the propeller strikes a heavy obstruction, bringing it to a virtually instantaneous stop. Assume that the short horizontal propeller shaft and the bevel gears have negligible flexibility. Calculate the elastic torsional shear stress in the vertical shaft. (Since this stress far exceeds any possible torsional elastic strength, a shear pin or slipping clutch would be used to protect the shaft and associated costly parts.)
How much electric power is needed? Is it legitimate to treat it as a constant-wall-temperature heater in calculating the convective part of the heat transfer? The surroundings are at 20?C and the surrounding room is virtually black
nitrogen gas at 60 kpa and 7 degc enters an adiabatic diffuser steadily with a velocity of 200 ms and leaves at 85 kpa
Refrigerant R134a enters the compressor of a refrigerator at 0.14 MPa and -10°C at a rate of 0.12 kg/s and leaves it at 0.7 MPa and 50°C. The refrigerant is cooled in the condenser to 24°C and 0.65 MPa and it is throttled to 0.15 MPa.
If the support C undergoes the harmonic angular displacement β(t) = β0 sin ωt, where β0 = 2? and ω = 7.5 rad/s, find the steady-state angular amplitude of bar AB.
The beauty of a bicycle wheel design is that the spokes (narrow cylindrical wires connecting the wheel center to the perimeter) are loaded in tension, despite the compressive force exerted via the bicyclist's weight. Consider a stainless steel spoke ..
Water at 290 K flows at 1 m/s along a flat plate. For x
Two pieces of AISI 1025 steel are being shielded-metal arc welded with E6012 electrodes. Some difficulty is being experienced with cracking in the weld beads and in the heat-affected zones. What possible corrective measures might you suggest?
a a steel made up of 100 martensite is completely tempered to give an equilibrium composition consisting of 85 wt
a thin-walled tube is subjected to an axial force of 40 kn. if the tube elongates 3mm and its circumfrence decreases
three horizontal forces are applied as shown to a vertical cast-iron arm. determine the resultant of the forces and the
a rigid vessel contains 10 kg of steam. the steam is initially at 10 bar and 300 c. after a period of time the pressure
A satellite rotates around the globe at 16,000 km/h. To reenter into the atmosphere, the speed is reduced by 1000 km/h by firing a small rocket in the direction opposite that of the satellite's motion. What are the velocity vectors of the satellit..
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