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4/125 The power unit A of the tractor-scraper has a mass of 4 Mg with mass center at G1. The fully loaded trailer-scraper unit B has a mass of 24 Mg with mass center at G2. Positioning of the scraper is con- trolled by two hydraulic cylinders EF, one on each
4/126 An automatic window-positioning system for a greenhouse is shown in the ?gure. Window OA has a mass of 50 kg with mass center at G. A motor (not shown) drives the gear C, which in turn moves the positioning rack AB. For the window position shown, determine the motor torque M which must be supplied to the pinion C. Neglect the weight of bar AB.
Consider a steam power plant that operates on the ideal reheat rankine cycle. Steam enters the high-pressure turbine at 6 mpa and 400°c and leaves at 2 mpa. Steam is reheated to 400°c and expands in the low-pressure turbine to 20 kpa.
A 15 m/sec wind at 101.3 kPa and 20 degrees Celeus enter a two-bladed wind turbine with a diameter of 15 m. Calculate the following. The power of the incoming wind. The theoretical maximum power that could be extracted
An Al2O3 whisker is a small single crystal used to reinforce metal-matrix composites. Given a cylindrical shape, calculate the number of Al atoms and the number of O atoms in a whisker with a diameter of 1 micrometer and a length of 25 micrometers. (..
complete the following exercises. in each case locate the state on sketches of the t-v and p-v diagrams. four kg of
measurements of drag force are made on a model automobile in a towing tank filled with fresh water. the model length is
a certain process requires 2.3 cubic feet per second of water to be delivered at a pressure of 30 psi. this water comes
What is the rate of heat transfer through a wall that is 2 m high by 2.5 m wide? Sketch the temperature distribution.
a why is it useful to plot the results on log-log graph paper rather than cartesian graph paperb what are some of the
the edges of a thin plate are held at the temperature described below. determine the steady-state temperature
a mass that weighs 8 lb stretches a spring 4 in. the mass is attached to a dashpot mechanism that has a damping
the diameter of a cylindrical water tank is d0 and its height is h. the tank is filled with water which is open to the
In superplastic forming, it is often necessary to control the strain rate. Consider the forming of a hemispherical dome by clamping a sheet over a circular hole and bulging it with gas pressure.
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