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1. A motor attached to the shaft at O causes the arm OA to rotate over the range 0 () 180°. The un- stretched length of the spring is 0.65 m, and it can support both tension and compression. If the net moment about O must be zero, determine and plot the required motor torque M as a function of ().
2. The tension T in cable AB is maintained at a constant value of 120 N. Determine the moment MO of this tension about point O over the range 0 () 90°. Plot the x-, y-, and z-components of MO as functions of ().
An elevator descends from rest with an acceleration of 5 ft>s2 until it achieves a velocity of 15 ft>s. Determine the time required and the distance traveled.
one kilogram of water contained in a sealed piston-cylinder assembly initially at 160degc and 200 kpa undergoes an
A heat engine operates between reservoirs at 1000 and 300 K. Some of the power output from the heat engine drives a refrigerator which operates between 250 and 300 K. The heat-transfer input at 1000 K to the heat engine is 1000 kJ, and the heat trans..
Consider a 2500 psia/1000 F turbine inlet, single reheat to 1000 F cycle with a reheat pressure ratio of P2/P1= 0.2 and a steam mass flow rate of 2 x 10^6 ibm/hr. The condensor operates at a pressure of 1 psia. Pump and turbine isentropic efficiencie..
derive the scaling relation for the strain energy release rate of crack extension under fixed displacement. clearly
A cube of wood having an edge dimension of 20.0 cm and a density of 650 kg/m3 floats on water.
The system acetone(1) and methanol(2) is well represented by the one parameter Margules equation using A = 0.605 at 50 degrees C. a) What is bubble pressure for an equimolar mixture at 30 C?
a 45 kg machine is mounted on a spring of stiffness 8 times 10 5 nm. when the machine operates at 32 hz. the machines
a mercury manometer ?13600 kgm3 is connected to an air duct to measure the pressure inside. the difference in the
Air undergoes a polytrophic process in a piston cylinder assembly from p1=1 atm, T1=70 degrees F to p2=5 atm. Employing the ideal gas model with constant specific heats at 80 degrees F, determine the work and heat transfer per unit mass,
a 10-lb block b rests as shown on a 20-lb bracket a. the coefficients of friction are us0.3 and uk0.25 between block b
a heat pump with a cop of 3.0 is used to heat air contained in a 1205.4m3 of well-insulated rigid tank. initially the
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