Samantha uses the Elgamal signature scheme with prime p = 6961 and primitive root g = 437.
(a) Samantha’s private signing key is a = 6104. What is her public verification key?
(b) Samantha signs the digital document D = 5584 using random element k = 4451. What is the signature?

Compute the pressure drop of 30°c air flowing with a mean velocity of 8 m/s in a circular sheet-metal duct 300 mm in diameter and 15 m long. use a friction factor, f 0.02, and pair = 1.1644 kg/m a. 37.26 pa b. 25.27 pa n c. 29.34 pa d. 30.52 pa

An open feedwater heater operates at steady state with liquid entering at inlet 1 with t? = 40°c and pl = 1 .2 mpa. water vapor att2-200°c and p2 = 1.2 mpa enters at inlet 2. saturated liquid water exits with a pressure of pa 1.2 mpa. neglect heat transfer with the surroundings and all kinetic and potential energy effects, determine the mass flow rate of steam at inlet 2 if the mass flow rate of liquid water at inlet 1 is given as 2 kg/s.

How to increase the thermal officiency of an ideal simple rankino cycle? among these methods, which one is the best and why?