Air at 200 kpa and 800k enters an adiabatic nozzle at low velocity (can be considered negligible) and is discharged at a pressure of 90 kpa. if the isentropic efficiency of the nozzle is 90%, determine: [20] a. the exit temperature if the process is isentropic b. the maximum possible exit velocity c. the actual exit temperature d. the actual exit velocity

Aparticle's position is given by x = 3.00 - 9.00t + 3t2, in which x is in meters and t is in seconds. (a) what is its velocity at t = 1 s? (b) is it moving in the positive or negative direction of x just then? (c) what is its speed just then? (d) is the speed increasing or decreasing just then? (try answering the next two questions without further calculation.) (e) is there ever an instant when the velocity is zero? if so, give the time t; if not, answer "0". (f) is there a time after t = 3 s when the particle is moving in the negative direction of x? if so, give the time t; if not, answer "0".