An otto cycle, analyzed using cold air-standard assumptions, has a a)-if the thermal efficiency of the cycle is 0.57, find the specific work b)- plot the thermal efficiency as a function of the compression ratio c)- based partially on the previous plot, would you continue peak temperature of 2500 k and a peak pressure of 60 bar during the isentropic expansion. for a cold air-standard otto cycle, using values of r =5,10,15,20. increasing the compression ratio, without reservations, in an actual design? explain.