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Figure P12.50D shows a wheelchair brake in its retracted position, with a tension spring exerting a force of 4 N, which holds the handle against the pin stop. When the handle is moved clockwise, pivot A drops below the axis of the spring (thereby going "overcenter"), and the spring acts to hold the brake shoe against the tire. Available space limits the outside diameter of the spring to 10 mm. Estimate the dimensions needed by scaling the drawing. Determine a satisfactory combination of D, d, N, wire material, and free length of coiled section.
Write an academic style paper fourpages (double spaced) in length with at least three references. Web references, including commercial sites, are preferred. It is recommended to use Google Docs and EasyBib (or equivalent app) as demonstrated in cl..
a projectile enters a resisting medium a x 0 with a initial velocity of vo 900 fts and travels 4 in. before coming to
natural gas consists of a mixture of several gases. one example is 84 percent methane 14.8 percent ethane .70 percent
A pinion with 24 teeth has a tooth thickness of 0.2550 in. at a cutting pitch radius of 1.500 in. and a pressure angle of 20°. A gear having 40 teeth has a tooth thickness of 0.2300 in. at a cutting pitch radius of 2.500 in. and a pressure angle o..
Consider an n-type material at 300 K with donor levels 0.02 eV below the conduction band
A 2-in.-diameter bar of 4320 steel is to have a hardness of at least HRC 35. What is the minimum severity of the quench (H coefficient)? What type of quenching medium would you recommend to produce the desired hardness with the least chance of que..
An air compressor draws in 1,000 of free air at a gauge pressure of 0 psi and a temperature of 60°F The air is compressed to a gauge pressure of a100 psi at a temperature of 130°F. - Determine the volume of air after it is compressed.
Consider an electron in the first Bohr orbit of a hydrogen atom. What is the radius (in meters) of this orbit? What is the total energy (in eV) of the electron in this orbit?
Determine the radiation per unit area in the bandwidth of 1 micrometer to 2.5 micrometer in W/m^2 from a balck body at 2500 K.
Calculate the velocity of a satellite in orbit around the earth in a geosynchronous orbit. Use the definition of a sidereal day which is 86164.09 sec. What is the orbit height in km?
an engine operates on an air standard otto cycle with the compression ratio of 91. the pressure and temperature at the
The ball is kicked from point A with the initial velocity vA=10m/s. Determine the range R, and the speed when the ball strikes the ground
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