A Track 1, Track 2 and Track 3 demonstrate that there is no change in velocity; hence, acceleration exists.

B
Track 1, Track 2 and Track 3 demonstrate that there is no change in speed; hence, acceleration exists.

C
Track 1, Track 2 and Track 3 demonstrate that each has a different acceleration because the cars are moving at different speeds.

D
Track 1 and Track 2 demonstrate that there is no change in velocity so acceleration does not exist, but Track 3 demonstrates that the change in the direction of the car results in a change in velocity; hence, acceleration exists.

Why is metal often used for cooking pan?

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?

When the magnetic domains in a material can be aligned, but eventually drift out of alignment, the material is