A rotating shaft of 30 mm in diameter is ground from AISI 1020 CD steel (UTS = 470 MPa). What is the modified endurance limit [MPa] (Se, NOT Se')? Consider only two modification factors: the surface modification factor (ka) and the size modification factor (kb). Ignore other modification factors.

Identify the correct relation showing that the radius r of the orbit of a moon of a given planet can be determined from the radius r of the planet, the acceleration of gravity at the surface of the planet, and the time τ required by the moon to complete one full revolution about the planet. determine the acceleration of gravity at the surface of the planet jupiter knowing that r = 71 492 km and that t= 3.551 days and r= 670.9 × 10^3 km for its moon europa.