Ahole is punched at a in a plastic sheet by applying a 660-n force p to end d of lever cd, which is rigidly attached to the solid cylindrical shaft bc. design specifications require that the displacement of d should not exceed 15 mm from the time the punch first touches the plastic sheet to the time it actually penetrates it. determine the required diameter of shaft bc if the shaft is made of a steel with g.

Beryl states that insulation with the smallest possible thermal conductivity is best to keep a house warm in winter, but worst for keeping a house cool in summer. sapphire insists the reverse is true: low thermal conductivity is good in the summer, but bad in the winter. which one, if either is correct? a. beryl, because low thermal conductivity results in low heat transfer. b. beryl, because low thermal conductivity results in high heat transfer. d. sapphire, because low thermal conductivity results in high heat transfer. e. neither, because low heat transfer is desirable both in summer and in winter.