1. A 20 N force is necessary to stretch a spring 0.5 m. What is the spring constant of this spring?

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.

Who was the first scientist to measure speed as distance over time?

What part of the ear is names after tools, such as the hammer and the anvil?