PROBLEM 3.49 The electric motor exerts a torque of on the steel shaft ABCD when it is rotating at constant speed. Design specifications require that the diameter of the shaft be uniform from A to D and that the angle of twist between A to D not exceed 1.5°. Knowing that and G ? 77.2 GPa, determine the minimum diameter shaft that can be used.
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This process uses light amplification by stimulated emission of radiation, which cuts material with instant temperatures of up to 75,000°F (41,650°C) and produces smooth surfaces without burrs or rough edges.
a. laser machining b. electrodischarge machining (EDM) c. electron beam (EB) d. ultrasonic machining
What is the approximate range of frequencies (?) in human speech and their corresponding wavelengths? For all practical purposes, the speed of sound in air may be assumed = 1,000 ft/s in place of its exact value of 1130 ft/s.
What will be an ideal response?
When planning a cast-in-place open concrete stairway, treads and risers are laid out on _____.
a. the subfloor b. full-size templates c. temporary panels d. graph paper
ASE-Style Multiple Choice Which of the following statements is LEAST Likely true?
A. The vehicle's paint, or finish, performs two basic functions - it beautifies and it protects. B. Paint mixing involves carefully measuring out the correct amount of refinish ingredients following manufacturer instructions. C. The mixing room, or mixing lab, is a power-ventilated area where refinish materials are mixed and prepared for application. D. Priming is done to remove scratches left from coarse sanding and also to scuff unrepaired areas so that the new paint will not peel off.