Determine the yield strength-to-density ratios (specific strength) in units of KN. m/kg for AISI 1018 CD steel, 2011-T6 aluminum, Ti-6AL-4V titanium alloy, and ASTM No. 40 gray cast iron.

An electric motor is used to drive a power press which makes steel turning moment diagrams 323 pressings from a metal sheet. the motor runs at a mean speed of 50 rev/s. the torque required is 10.0nm for 0.2s, followed by 1.0nm for0.3 s with this sequence then being repeated. what is the minimum power required of the motor and the moment of incrtia required for the t1ywhcel if the speed fluctuations are to be restricted to 1.5%?