Animals do not contribute to natural erosion

True or false

If the speed of a particle triples ,by what factor does its kinetic energy increase?

According to newtons universal law of gravitation, which would change the parh of the ball so it traces out widest curved path possible?

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.