A beam on a wall is held up by a string. the string is 4 m from the wall with a 30° angle. The other side of the beam there is a 20.0 kg weight 2 m from the string. what is the tension

How much work does the charge escalator do to move 2.30 μc of charge from the negative terminal to the positive terminal of a 3.00 v battery?

What is the scientific definition of energy that relates to work

Light traveling in a medium with a refractive index 1.19 is incident on a plate of another medium with index of refraction 1.79. at what angle of incidence is the reflected light fully polarized?