A pole vaulter pushes the pole strongly down into the ground to lift the athlete’s body up over the bar. what law of motion is it.

When the velocity of an object is doubled, by what factor is its momentum changed? by what factor is its kinetic energy changed? a) the momentum is zero. b) the momentum is not zero. c) difficult to say.

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?

If angle "a" is 25°, angle "b" is: a) equal to angle c b) less than angle c c) greater than angle c