In a well, water is filled up to the height of 6 meters. Calculate the pressure given by the water at the bottom of the well.

Why does the input force have to be greater than the force needed to lift the bale?

Two polarizers are oriented at 40∘ to each other and plane-polarized light is incident on them. if only 16 percent of the light gets through both of them, what was the initial polarization direction of the incident light?

A100-watt light bulb illuminates a solar cell. the electricity from the solar cell operates a water pump that delivers 1 watt of power. what is the efficiency of the system?