3. A copper rod is 3 m long at a certain temperature. Calculate its length for a temperature rise of 100K if the linear expansivity of copper is 17 x 10^-6

Which type of wave can travel without a medium

Light that is polarized along the vertical direction is incident on a sheet of polarizing material. only 96% of the intensity of the light passes through the sheet and strikes a second sheet of polarizing material. no light passes through the second sheet. what angle does the transmission axis of the second sheet make with the vertical?

The voltage applied across a given parallel-plate capacitor is doubled. how is the energy stored in the capacitor affected?