At the grocery store an empty shopping cart has A mass of 15 kg. when you push it the empty car accelerates 2.0 meters per second squared. as you approach the checkout with 35 kg of groceries in the cart. (total mass=50kg) you push with the same force. How fast does the cart accelerate now ?

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.

Why is it important always to use horizontal bars in unit fractions when performing unit conversions?

The air that we breath is made mostly of which gaseous molecule