A student drops three blocks from the same height and measures the time it takes for the blocks to hit the ground. Each block has a different mass. What is the independent variable in the experiment?

A. the volume of the blocks

B. the mass of the blocks

C. the drop height

D. the time for the blocks to hit the ground

Thanks.

Awave is produced in a rope. the wave has a speed of 33 m/s and a frequency of 22 hz. what wavelength is produced?

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?

If the ama of the inclined plane below is 2, calculate the ima and efficiency. ima = efficiency =