Levi Malone is sledding with his friends in the frozen tundra. Angered by a coarse comment, he decides to separate from the group rather than
escalate the situation. He momentarily exerts a 30 N force on the rope
which is attached to his 4.8 kg sled. The rope makes an angle of 21° with
the horizontal nearly frictionless surface. determine the acceleration

Sound waves are mechanical waves in which the particles in the medium vibrate ina direction parrallel to the direction of energy transport. what is another name of the type of wave that transfers energy in this way?

In what direction does the medium move relative to the direction of the wave? explain.

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?