A wood pipe having an inner diameter of 3 ft. ft. is bound together using steel hoops having a cross sectional area of 0.2 in.2 in.2 The allowable stress for the hoops is σallos=11.4 ksiσallos=11.4 ksi. Determine the maximum spacing s along the pipe so that the pipe can resist an internal gauge pressure of 4 psi psi.

Students in an introductory physics lab are performing an experiment with a parallel-plate capacitor made of two circular aluminum plates, each 11 cm in diameter, separated by 1.0 cm. how much charge can be added to each of the plates before a spark jumps between the two plates? for such flat electrodes, assume that value of 3×106n/c of the field causes a spark.