What happens to F, in the following scenarios? 1) M is doubled
2) m is tripled
3) m and M are BOTH doubled
4) M is halved
5) r is doubled
6) r is tripled
7) r increases ten times
8) r is halved​

The percent efficiency of a machine can never be 100% (or greater), because in the real world some energy is always converted into a. heat b. work c. input force d. output force

Unpolarized light of intensity i_0=750w/m^2 is incident upon two polarizers. after passing through both polarizers the intensity is i_2=280w/m^2. (a) what is the intensity of the light after it passes through the first polarizer in w/m^2? (b) write an equation for the angle between the polarizers in terms of the initial (i_0) and final (i_2) intensities. (c) find the angle between the polarizers in degrees.

If you put a helium-filled balloon in the refrigerator, what will happen?