Two cars moving in an opposite direction on the same straight road with velocities 80km/h and 60km/h respectively pass each other at a point determine the velocity of each of the car relative to the school car

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?

Chemical energy is a form of energy. a. heat b. kinetic c. potential d. electromagnetic

It is really hard for me right know