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Design a pair of standard spur gears for transmitting 60 hp from a 5200-rpm motor to a 1300-rpm machine. A safety factor of 1.2 should be used, together with 99% reliability and a life of 107 pinion revolutions at full load (with the remaining lower-load cycles being negligible). It is important to minimize size and weight. Use case-hardened alloy steel gears of 660 Bhn (pinion) and 600 Bhn (gear), and use Table 15.5 to estimate surface fatigue strength. Specify an appropriate combination of diametral pitch, numbers of teeth, center distance, face width, and level of manufacturing accuracy.
Determine the difference in pressure between the inside and outside of a soap film bubble at 20 °C if the diameter of the bubble is 4 mm.
In a particular fission event, a thermal neutron produces fission of a U-235 atom. For this particular event, the fission products Br-90 and Xe-143 are produced as well as 3 neutrons. How much energy in MeV is produced from this event?
A polymeric material is being considered as a coating film to protect an optical storage disk from water vapor damage. Suppose we need to protect a disk surface from an ambient medium that will be at 45% relative humidity at 25° C. How thick must the..
titanium is stiffer than aluminum has a lower thermal expansion coefficient than aluminum and has a higher melting
estimate the theoretical fracture strength of a brittle material if it is known that fracture occurs by the propagation
Two standard gears have a diametral pitch of 12 and a gear ratio of 7.0. The center distance is 8 in. Determine the number of teeth on each gear.
A satellite has been placed in a circular, sun-synchronous orbit at an altitude of 1300.0 km. The satellite has a mass of 5,000.0 kg. What is the K.E. of the satellite?
consider an air conditioning system where warm humid air flows first over cooling coils where it is cooled and
A current source i(t) is connected to a 100-Q resistor. Find the average power delivered to the resistor, given that i(t) is:
a spool of mass m214 kg inner and outer radii p1.84 m and r 2.23 m respectively and the radius of gyration kg 2m is
Suppose, by rapid solidification from the liquid state, that a supersaturated Al-7% Li alloy can be produced and subsequently aged. Compare the amount of β that will form in this alloy with that formed in a 2090 alloy.
Consider a system of six distinguishable spin-1/2 particles each with magnetic moment µ. List the various possible magnetic moments for this system (in terms of µ) and give the entropy for each.
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