Motor of 1 HP has 66% efficiency it can lift some water at 10 metre height in 2 seconds what is the mass of the water

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.

We put a force of 50n on an object and the acceleration is 100 m/s². what is the mass of the object?

The softest and hardest minerals are: softest hardest