The model of a certain mass-spring-damper system is:

10x'' + cx' + 20x = f(t)

How large must the damping constant c be so that the maximum steady-state amplitude of x is no greater than 3, if the input is f(t) = 11sin(wt), for an arbitrary value of w?

Acompressor receives the shaft work to decrease the pressure of the fluid. a)- true b)- false

During a steady flow process, the change of energy with respect to time is zero. a)- true b)- false

An ideal otto cycle with air as the working fluid has a compression ratio of 8. the minimum and maximum temperatures in the cycle are 300 k and 1340 k. use constant specific heats at room temperature to determine (a) the amount of heat transferred to the air during the heat- addition kj/kg, (b) the thermal efficiency, and (c) the thermal efficiency of a carnot cycle ope limits. process, in rating between the same temperature