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A strip of metal is originally 1.5 m long. It is stretched in three steps: first to a length of 2 m, then to 2.5 m, and finally to 3.0 m. Show that the total true strain is the sum of the true strains in each step, that is the true strains are additive. Show that using engineering strains, the strain for each step cannot be added to obtain the total strain.
Determine the number of revolutions that the motor executes in a) reaching its rated speed, b) coasting to rest.
With reference to basic constructional features, contrast the methods of compression employed by positive displacement and dynamic air compressors.
What is the wear coefficient of the bearing material in m2N-1 ?
Evaluate the reduction in pump BHP required by heating the oil from 50° F to 100° F. Suppose efficiency of 80% (HP)
rocket boosts the speed of a spacecraft from 7500 m/s to 10 500 m/s with a thrust of 890 kN. Calculate the rocket power.
If the truck starts from rest when xD is zero, and moves forward with a constant acceleration of aD = 5 m/s2, determine the speed of the block at the instant xD = 3 m.
determine the slenderness ratio of a 5 m column with built end if its cross section is a circular with a radius of 40 mm and b 50 mm square use the concept of effective length.
two solid cylinders rods AB and BC are welded together at B and loaded. determine the magnitude of the force P for which the tensile stress in rod AB is twice the magnitude of the compressive stress in rod BC?
Briefly explain the difference between fatigue striations and beachmarks in terms of both size and origin.
Determine a) the volume of the tank,b)the final temperature and pressure, and c) the internal energychange of the water.
xerted on the shaft shown in the figure, which rotates at 1150 rev/min and supports a 10-kip bending force. Use a 1095 HR steel. Specify a diameter d using a design factor of nd = 1.6 for a life of 3 min. The surfaces are machined.
A 15cm cube of mass 3kg is lubricated with SAE 10 oil at 20oC (dynamic viscosity of 0.104Ns/m2) slides down a 10o inclined plane at a constant velocity. Estimate the speed of the body if the oil film has a thickness of 2mm and the velocity distrib..
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