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The operation of this garage door is assisted using two springs AB and side members BCD, which are pinned at C. Assuming the springs are unstretched when the door is in the horizontal (open) position and ABCD is vertical, determine each spring stiffness k so that when the door falls to the vertical (closed) position, it will slowly come to a stop. Use appropriate numerical values to explain your result.
a shaft is loaded by a torque of 5 kn-m. the material has a yield point of 350 mpa. find the required diameter usinga
air at 1.0 atmosphere pressure and 77 0c enters a 5.0 mm i.d. tube with a bulk average velocity of 2.5 ms. the velocity
neglecting the effects of radiation absorption emission and scattering within their atmospheres calculate the average
a power plant generates 150 mw of electrical power. it uses a supply of 1000 mw from a geothermal source and rejects
Water in a vertical piston cylinder is heated at constant pressure of 10 bar. It is initially at 179.9 0C and has a specific volume of 0.1 m3/kg and is heated to a final specific volume of 0.248 m3/kg. Changes in kinetic and potential energies are ze..
a single stream tube is selected to characterize the air flow past the wing of an aircraft in flight at an altitude of
the turbine of a large power plant receives 1.00 x 108 btuh of heat from the boiler at 900degf and rejects 5.50 x 106
helium initially at 327 deg. c and 100 kpa is contained in a frictionless piston-cylinder. the system is slowly cooled
to determine the viscosity of a liquid of density 948 kgm3 you fill to a depth of 12 cm a large container whichdrains
Compact heat exchangers (CHEs) were among the first unit operations to be classified as intensified - Describe the Printed Circuit Heat Exchanger (PCHE) and its merits and potential uses.
a closed rigid tank contains 2 kg of water initially a twophase liquid-vapor mixture at 80degc. heat transfer occurs
if the roller at b can sustain a maximum load of 3 kn determine the largest magnitude of each of the three forces f
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