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1. Consider a group of 30 people who wish to establish pair-wise secure communications using symmetric-key cryptography. How many keys need to be exchanged in total?
2. Suppose Bob receives a message signed using a digital signature scheme with Alice's secret signing key. Does this prove that Alice saw the message in question and chose to sign it?
A thin triangular plate of mass m is welded along its base AB to a block as shown. Knowing that the plate forms an angle u with the y axis,
Find the angular velocity of a football spinning at ? about its long axis and traveling at a constant speed v0 tangent to a semicircle of radius R,
Force Flow Diagrams to find load paths - force on piston at design pressure
The isentropic compressor efficiency is 80%. Refrigerant exits the condenser as a saturated liquid at 160 lbf/in.2 The mass flow rate of the refrigerant is 0.15 lb/s. Kinetic and potential energy changes are negligible as are changes in pressure f..
consider an ideal fuel cell to be run on pure oxygen and hydrogen for a length of time. determine the ration of the
Water at 27 C flows through a tube of diameter d = 50 mm. If the flow is fully-developed and has a mass flow rate of 0.01 kg/s, find the maximum velocity in the tube, and the pressure gradient, dp/dx
determine the system of equations from the process designed to produce a desired gas from raw materialsxdot ax buy
Water is in a 0.05 m^3 piston-cylinder assembly at 1 MPa, 220 C and the piston is resting on stops. Heat is added until the pressure doubles. At this point the piston movies until the volume increases by 50%.
Note that the positive y direction is downward and counterclockwise torques are positive. find alpha the angular acceleration?
Starting from the ideal gas law and the first law of thermodynamics derive the relationship between a) pressure temperature and, b) pressure and specific volume in isentropic compression show detail proof.
With a proper sequence of thermal processing, aluminum alloyed with 4% copper can be caused to contain a large number of very small particles of the hard intermetallic compound CuAl2. How would you expect the yield strength of such processed alloy to..
A tank with a fixed volume contains 1 kg of dry air at 200oC . If 200 kJ of heat is added to the tank determine the final temperature and change in entropy.
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