Chapter 1: Problem 19
Write a report reviewing the web site http://www.uspto.gov. From a mechanical engineer's viewpoint, discuss the contents, usefulness, cost, ease of use, and clarity of the site. Identify the search tools available.
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Chapter 1: Problem 19
Write a report reviewing the web site http://www.uspto.gov. From a mechanical engineer's viewpoint, discuss the contents, usefulness, cost, ease of use, and clarity of the site. Identify the search tools available.
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A steel wire suspended vertically has a cross-sectional area of \(0.1 \mathrm{in}^{2}\) and an initial length of \(10 \mathrm{ft}\). A downward force applied to the end of the wire causes the wire to stretch. The force varies linearly with the length of the wire from zero initially to \(2500 \mathrm{lb}\) when the length has increased by \(0.01 \mathrm{ft}\). Determine (a) the normal stress, in \(\mathrm{lb} / \mathrm{in}^{2}\), at the end of the wire as a function of the length of the wire and (b) the work done in stretching the wire, in \(\mathrm{ft} \cdot \mathrm{lb}\).
An object whose mass is \(7.8 \mathrm{~kg}\) occupies a volume of \(0.7 \mathrm{~m}^{3}\). Determine its (a) weight, in newtons, and average density, in \(\mathrm{kg} / \mathrm{m}^{3}\), at a location on the earth where \(g=9.55 \mathrm{~m} / \mathrm{s}^{2}\), (b) weight, in newtons, and average density, in \(\mathrm{kg} / \mathrm{m}^{3}\), on the moon where \(g=1.7 \mathrm{~m} / \mathrm{s}^{2}\).
An incident occurred on a cattle ranch that resulted in an injury to the operator of a tub grinder. The tub grinder was being used to grind hay bales. The grinder was powered from a tractor by means of (i) hydraulic fluid pressure (that powered a hydraulic motor that turned the tub) and (ii) a power take off (PTO) shaft that powers a spinning hammer mill that rotates to "grind" the hay bale. The discharge spout of the tub grinder became clogged during operation. The operator exited the cab of the tractor, "turning off" the tractor PTO while leaving the tractor engine running. He walked to the tub grinder spout area, removed pins and opened the tub grinder shields (guards). The operator reached into the unguarded opening and at some point his right hand contacted the still rotating hammer mill of the tub grinder. At issue are (a) whether the tub grinder contained proper warnings, (b) whether the tub grinder hammer mill was properly guarded, and (c) whether the hammer mill should be allowed to "coast down" to a stop, or the hammer mill should stop rotating immediately once the tractor PTO is "turned off." Search the OSHA regulations http://www.osha.gov and specifically review the regulations 29 CFR \(1910.212\), General requirement for all machines, 29 CFR 1910.147, The control of hazardous energy (lockout/tagout), and 29 CFR 1910.145, Specifications for accident prevention signs and tags. Write several paragraphs explaining how each regulation would apply to a tub grinder.
Search online at http://www.bodine-electric.com and www.electricmotors.machine .design.com, and copy speed torque curves and give typical applications for various types of fractional and subfractional motors (e.g., split phase, capacitor-start, induction, shaded pole, synchronous, universal, shunt, split- series field, compound, etc.).
A spacecraft component occupies a volume of \(8 \mathrm{ft}^{3}\) and weighs \(25 \mathrm{lb}\) at a location where the acceleration of gravity is \(31.0 \mathrm{ft} / \mathrm{s}^{2}\). Determine its weight, in pounds, and its average density, in lbm/ \(\mathrm{ft}^{3}\), on the moon, where \(\mathrm{g}=5.57 \mathrm{ft} / \mathrm{s}^{2}\).
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