Kinetic energy: energy of motion. this means the of objects with mass and velocity

Suppose you have three polarizing filters, with the second at an angle of 42∘ to the first and the third at an angle of 90∘ to the first. by what perfect will the original intensity of unpolarized light be reduced to after passing through all three filters?

If y gets smaller as x gets bigger and y have an relationship?

Positrons are spontaneously emitted from the nuclei of