A40-mm-diameter solid steel shaft, used as a torque transmitter, is replaced with a hollow shaft having a 40-mm od and a 36-mm id if both materials have the same strength, what is the percentage reduction in torque transmission? what is the percentage reduction in shaft weight?

A248-g piece of copper is dropped into 390 ml of water at 22.6 °c. the final temperature of the water was measured as 39.9 °c. calculate the initial temperature of the piece of copper. assume that all heat transfer occurs between the copper and the water. remember, the density of water is 1.0 g/m

One form of energy can be another type of energy. a. created to form b. transformed into c. destroyed and then created to form

In science and physics what is the standard unit of measure for speed?