Give the expressions for the following: 1. Restoring force of an oscillating spring-block system.
2. Restoring force in an oscillating simple pendulum.
3. Elastic potential energy of a spring block system.
4. Total energy in a simple pendulum.
5. Velocity of a wave on a string.

If steel is more dense that lake water, why can a boat float

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?

Explain what it means to view something from a frame of reference. provide an example that illustrates your explanation. (4 points)