A bending moment of 2000 N ⋅ m is applied to a 40-mm-diameter shaft. Estimate the bending stress at the shaft surface. If a hollow shaft of outside diameter 1.15 times inside diameter is used, determine the outside diameter required to give the same outer surface stress.

The star betelgeuse is about 600 light-years away. if it explodes tonight, a. we'll know because debris from the explosion will rain down on us from space. b. we'll know it immediately because it will be brighter than the full moon in the sky. c. we won't know about it until 600 years from now. d. none of the above.

Which sound characteristic is not affected by the relative motion of an object

An isotope undergoes radioactive decay by emitting radiation that has a –1 charge. what other characteristic does the radiation have?