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Two 455,000-lb locomotives pull 58 230,000-lb coal hoppers cars. The train starts from rest and accelerates uniformly to a speed of 32 mi/hr over a distance of 7000 ft on a level track. The constant rolling resistance of each car is 0.005 times its weight. Neglect all other retarding forces and assume that each locomotive contributes equally to the tractive force. Determine (a) the tractive force exerted by each locomotive at 16 mi/hr, (b) the power required from each locomotive at 16 mi/hr, (c) the power required from each locomotive as the train speed approaches 32 mi/hr, and (d) the power required from each locomotive if the train cruises at a steady 32 mi/hr.
Describe on your own words the three strengthen mechanism for metals (i.e. grain size reduction, solid solution strengthening and strain hardening). Be sure to explain how dislocations are involved in each of the strengthening techniques.
piston and flywheelconsider the one-cylinder four-stroke engine assembly shown in figure 1. the mass of the piston p is
a turbofan jet engine has a large fan that sucks in air. some of this air enters a set of compressors is mixed with
sae 30 oil at 100oc flows through a 12-mm-diameter stainless-steel tube. what is the specific gravity and specific
water at 10degc is pumped from a lake through a pipe to an elevation of 25 m above the lake surface. the pipe is 650 m
Define your system to be the gas in the cylinder, and calculate the work transferred from the surroundings to the system from this expansion. Note that the pressure will change as the expansion takes place.
Determine a) the volume of the tank,b)the final temperature and pressure, and c) the internal energychange of the water.
a compressor installed at a whalf for loading container ships is able to provide 6 bar.g pressure into the pressure
a 100-mm long and 20-mm diameter rod of 403-stainless steel is pulled to fracture with reported results as follows
1- find the decay constant of cesium-137 half-life 30.2 y then calculate the activity in becquerels and curies for a
Midrange and amplitude components, A shaft is subjected to a completely reversed bending stress such that Xmax=40kpsi and Xmin=-40kpsi
the position of a point p on a line is given by the equation x t sinpi t2. the point starts moving at t0. find the
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