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For the gears in Problem 15.31, estimate the horsepower that can be transmitted, based on surface durability.
Problem 15.31
A pair of mating gears have 20° full-depth teeth with a diametral pitch of 8. Both gear and pinion are made of steel heat-treated to 350 Bhn, and both have a face width of 1.0 in. The teeth are cut with a top-quality hobbing operation. The pinion has 20 teeth and rotates 1100 rpm. It is mounted outboard on the shaft of an electric motor, and drives a 40-tooth gear that is positioned inboard on an accurately mounted blower shaft. The design life corresponds to 5 years of 60 hours/week, 50 weeks/year operation. Using a reliability of 99% and a safety factor of 1.5, estimate the horsepower that can be transmitted, based only on bending fatigue.
Look carefully at how messages and mailboxes are represented in the e-mail system that you use. Model the object classes that might be used in the system implementation to represent a mailbox and an e-mail message.
Compute the fugacities of ethane and n-butane in an equimolar mixture at 373.15K at 1, 10, and 15 bar total pressure assuming that the Lewis-Randall rule is correct.
The drawing (Figure P2.32) represents a bicycle with an 800-N rider applying full weight to one pedal. Treat this as a two-dimensional problem, with all components in the plane of the paper.
An insulated tank is divided into two parts by a partition. One part of the tank contains 2.5 kg of compressed liquid water at 60°C and 600 kPa while the other part is evacuated.
r-134a at 20 psia and 40of is compressed slowly adiabatically and without friction to a final pressure of 200 psia.
The parameters of a dc shunt machine are Rf = 240 Ω, LFF = 120 H, LAF = 1.8 H, ra = 0.6 Ω, and LAA = 0. The load torque is 5 N·m and Va = Vf = 240 V. Calculate the steady-state rotor speed.
A pitot-static tube is connected to a differential manometer using water at 40°C as the gage fluid. The velocity of air at 40°C and atmospheric pressure is to be measured, and it is expected that the maximum velocity will be 25 m/s. Calculate the ..
Compute the cubic splines that pass through the three given points. Evaluate the viscosity at 25°C. The measured value has been reported to be 0.8904 cp.
a coast guard cutter detects an unidentified ship at a distance of 19.6 km in the direction 17.8deg east of north. the
compute the range of widths for which the metacentric height is positive, that is, for which the design would be stable. Plot a graph of metacentric height versus width.
a baseball is thrown by a pitcher at 95 mph through standard air. the diameter of the baseball is 2.82in. estimate the
A model of an airplane is to be tested at 20°C in a wind tunnel. The model is built to 1/12th scale. In order to match both the Mach number and the Reynolds number of the plane, the wind tunnel is pressurized. To what pressure (in atm) should the air..
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