Aparticle moves parallel to a septa train parked on a straight level track. the speed v of the particle is such that (v/c) 2 = 0.36. in the reference frame of the particle, the length of the train is 200 m. what is the length of the train for someone standing at the train station?

The differences between  a compression wave and a transverse wave?

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?