Suppose that after a number of measurements, you were to find an average time δt=(0.0031±0.0002) s using a gate separation δd=(1.0±.1) cm when dropping a ball from the height h=(0.510±0.002) m. calculate g. give your answer in units of m/s2 to three digits (even though they may not all end up being i dont know what a gate seperation is. when i use a=(2h)/(t^2) to calculate g i get 106555.6712 and thats way too big. how do i work the gate seperation into it to get g i know how to do the uncertainty part.

Unpolarized light falls on two polarizer sheets whose transmission axes are at right angles. a third polarizer is placed between the first two so that its axis makes a 52-degree angle with the axis of the first polarizer. a) what fraction of the incident light intensity is transmitted through the first polaroid? b) what fraction of the incident light intensity is transmitted through the second polaroid? c) what is the angle of polarization of the light that enters the third polaroid? d) what fraction of the incident light intensity is transmitted through the third polaroid. e) what happens if the middle polaroid is removed?