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The pulley system shown is at rest when the motor M starts pulling in rope so as to lift the 119 lb cargo C. For the first second of operating, the motor is able to produce a tension in the rope of the form F0(1+t/T) where F0=40 lb. Neglect the inertia of the pulleys and of the rope. If T=.5 s, use the impulse-momentum principle to determine the speed of the crate after 1 s.
water used in a power plant passes through a heat exchanger at a mass flow rate of 0.125 kgs and is cooled from 94degc
Use potential flow theory to determine the lift coefficient of a spinning baseball in terms of the forward velocity (V ) and spin RPM.
A flat surface 4m wide and 10m long is exposed to air flow parrallel to its long side. The speed of the air is 55 km/h and the temperature is 5C. If the temp of the surface is constant at 12C, calculate the heat loss from the surface. Air properties ..
a 12-mm-diameter specimen is subjected to tensile loading. the increase in length resulting from a load of 9 kn is
particle p moves in the x-y plane on the path described by yx24x212.5 where x y are given in feet. if x2ft and
What is the prudent economic decision and recalculate the above problem for this higher, i.e. 11%, return on investment.
a flat plate of width 1 m and length 0.2 m is maintained at a temperature of 32degc. ambient fluid at 22degc flows
thermodynamically analyze a hydrogen joule-thomson cycle ment to liquify hydrogen with isothermal compression occurring
an extruded beam has the cross section shown and a uniform wall thikness of 3mm. for a vertical shear of 1.2 kips
Determine the magnitude and coordinate direction angles of F3 so that the resultant of the three forces acts along the positively y axis and has a magnitude of 600lb.
Air enters a one-inlet, one-exit control volume at 6 bar, the pressure is 3 bar, the temperature is 456.5 K, and the velocity is 300 m/s. The air behaves as an ideal gas for steady-state operation, determine: (a) the mass flow rate in kg/s (b) the ex..
a house wall consists of 12 in. drywall 3 58 in. glass fiber insulation and an outside brick wall 4 in. thick. assume
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