Water on a smooth floor can made you slip, which means water is also a lubricant. can you think of reasons why oil and grease and not water is used i machines as a lubricant?

What is the radius of the circular path ofa charged particle in a magnetic field?

How does convection affect our atmosphere? our layers of earth? our oceans?

Unpolarized light falls on two polarizer sheets whose transmission axes are at right angles. a third polarizer is placed between the first two so that its axis makes a 52-degree angle with the axis of the first polarizer. a) what fraction of the incident light intensity is transmitted through the first polaroid? b) what fraction of the incident light intensity is transmitted through the second polaroid? c) what is the angle of polarization of the light that enters the third polaroid? d) what fraction of the incident light intensity is transmitted through the third polaroid. e) what happens if the middle polaroid is removed?