A boy pulls a sled at a constant speed of 2.5 m/s by applying a force of 326 N. How much work does the boy do on the sled over a time of 1955 s?

True or false when elements combine to form a mixture, the resulting chemical properties may be very different from those of the elements that make it.

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?

In a classical model of the hydrogen atom, the electron moves around the proton in a circular orbit of radius 0.053 nm. what is the electron's orbital frequency? what is the effective current of the electron?