Three students measured the weight of a ball, their results were: John: 24.3 ± 0.1 g
Mark: 24.3 ± 0.2 g
Peter: 24.3 ± 0.3 g

The most precise student was:

Which are examples of projectile motion? choose all that apply a. a soccer ball rolling across the ground in the northeast direction b. a car turning a corner, so it is heading south c. a javelin flying through the air d. a tennis ball lobbed over the net

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.

What is the average speed of a car that travels 40 mph for 1 hour and 60 mph in another hour?