, 14.04.2020 18:39, alexam2007

# A force is applied to the handle 3.5 in from the screw center-line. The diameter of the handle is 0.375 in and the handle is made of 1018 cold drawn steel. The screw is a square-threaded power screw with an outside diameter of 0.75 in and 5 threads per inch. (a) What force applied to the handle would cause the handle to yield? (b) What clamping force would this same handle force create? You may assume a thread friction coecient of 0.10 and a collar friction coecient of 0.08 with a mean collar diameter of 0.80 in. (c) Compute the shear stress due to torque, axial stress due to load, and bending stress at thread root on a section of the screw between the clamped member and the upper portion of the \C." See text, p. 411 (d) Combine the previous three stresses as a von Mises stress and nd a factor of safety against yielding for the screw. (e) Is this gadget self-locking? Would you want it to be?

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Physics, 22.06.2019 16:40, dylan6981
The astronauts on the space shuttle flights experienced an acceleration of 29 m/s2 (about 3 "g's") during lift-off. what upward force must the astronaut's seat apply to the astronaut in order to cause this acceleration? assume the astronaut's mass is 70 kg, and compute this force when the acceleration is near the earth's surface so their weight equals latex: mg m g .