Arock is rolling down a hill. at position 1, it’s velocity is 2.0 m/s. twelve seconds later, as it passes position 2, it’s velocity is 44.0 m/s. what is the acceleration of the rock?

42.0 m/s^2
3.7 m/s^2
3.8 m/s^2
3.5 m/s^2

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?

We have a colorless transparent liquid. it looks like water. we seperated it into a solid and a liquid by evaporration and condention was this a chemichal or a physical seperation a. chemical seperation b. physical seperation

What is the weight of a feather (mass = 0.0001 kg) that floats through earth's and the moon's atmospheres?