What is the magnitude of the maximum stress that exists at the tip of an internal crack having a radius of curvature of 2.5 $ 10-4 mm (10-5 in.) and a crack length of 2.5 $ 10-2 mm (10-3 in.) when a tensile stress of 170 MPa (25,000 psi) is applied

Abrake has a normal braking torque of 2.8 kip in and heat-dissipating cast-iron surfaces whose mass is 40 lbm. suppose a load is brought to rest in 8.0 s from an initial angular speed of 1600 rev/min using the normal braking torque; estimate the temperature rise of the heat dissipating surfaces.

Determine whether or not it is possible to compress air adiabatically from k to 140 kpa and 400 k. what is the entropy change during this process?

Thermal stresses are developed in a metal when its a) initial temperature is changed b) final temperature is changed c) density is changed d) thermal deformation is prevented e) expansion is prevented f) contraction is prevented