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Figure P9.29 shows a Geneva indexing mechanism used, for example, on the indexing heads of machine tools. Each time the driving arm makes one revolution, the Geneva wheel (for the four-slot design illustrated) turns 90°. The arm supports a rolling cylindrical hardened-steel pin that fits into the Geneva wheel slots. The pin is to have the same length and diameter. The wheel is made of heat-treated alloy cast iron (E = 140 GPa, v = 0.25). For a design contact stress of 700 MPa, determine the smallest acceptable pin diameter if the design overload torque (normal torque times safety factor) applied to the arm is 60 N m.
a cantilever beam with round cross section is loaded at the tip with a transverse force of 1000 lb. the beam is also
The electronic components of a computer are cooled by air flowing through a fan mounted at the inlet of the electronic enclosure. At steady state, air enters at 18oC, 1 atm. For noise control, the velocity of the entering air cannot exceed 0.9 m/s. F..
Air enters a 3600-kW turbine operating at steady state with a mass flow rate of 18 kg/s at 800oC, 3 bar and a velocity of 100 m/s. The air expands adiabatically through the turbine and exits at a velocity of 150 m/s.
A silty clay soil has a plasticity index (PI) of 14. Estimate the optimum moisture content and the maximum dry unit weight of the soil when compacted using the procedure of:
The zone temperature thermostat setting is 77 F, which is within the summer comfort zone. The bypass factor for the coil is 0.175 and the chilled water temperature is 50 F.
For fins of equal length and therefore equal mass, which fin has the largest heat transfer rate? Assume the gas properties are those of air at T = 350 K.
Find the angular velocity of B relative to N (NωB). You may leave your answer in a mixed Basis - Determine the velocity of point D in terms of an independent combination of q·1, q·2, and q·3.
in the system below for measuring fluid viscosity the inner cylindrical core is stationary the outer cylindrical shell
Determine heat flow, Heat flow through a uniform wall will: a) increase as the thermal resistance increases b) increase as the thickness of the wall increases
Express the total stator MMF. What is the speed and direction of the MMF?
a material element experiences 50 mpa compression in the x-direction 10 mpa tension in the y-direction and a negative
A rectangular beam of size 40mm*60mm is subjected to bending. the maximum bending stress is limited to 75N/mm^2. find the moment of resistance of beam section.
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