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A particle moves along a spiral described by the equation r=r(inital)+kappa*theta, where r(inital) and kappa are constants, and where theta is in radians. Assume that theta dot =alpha*time, where alpha= 0.15rad/s^2 and t is time expressed in seconds. If r=.25m and theta = 0 for t=0, determine kappa such that, for t=10s, the acceleration is completely in the radial direction. In addition, determine the value of the polar coordinates of the point for t=10s.
a most fiber-reinforced composites consist of three parts the fibers the matrix and the interfaces. describe the major
suppose lithium is dissolved interstitially in silicon. would you expect the lithium atoms to be donors or acceptors?
air flows through a nozzle at high velocities such that compressible flow effects are important. the air exits the
a bottle containing 10 kg of water at an initial temperature of 35 degrees celsius is stored in a refrigerator whose
water is the working fluid in an ideal regenerative rankine cycle. superheated vapor enters the turbine at 10 mpa 5000c
A compressor, having 80% efficiency, requires 25 MW power to pressurize air. Calculate the power requirement for the same inlet conditions and exit pressure if the compressor is made isentropic by redesigning it
a piston cylinder device with a set of stops on the top initially contains 3 kg of air at 200kpa and 27 degrees
describe one method for manipulation of microstructure and mechanical properties for each of the following class of
Suppose a 24V drill has a current drawn from it that measures 5 amps. The drill bit is 2 inches in diameter. What force is the drill bit placing on the surface if the speed is 25 rpm? Assume the drill has an efficiency of 90%
liquid water enters a pump at 15degc 100 kpa and exits at a pressure of 5 mpa. if the isentropic efficiency of the pump
Determine the temperature of the electric heater element and drawing of the temperature profile.
a stone of mass m is tied to one end of a string ans is rotated with constant angular vel. w. the length of the string
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