Hello, I'm having trouble with a lab report. The experiment conducted was we used an angled air-track and a timer to determine the speed at which an object slid down the track and its acceleration. The final average acceleration we calculated was (61.034 +- 2.227)(cm/s2) We're then given a formula to calculate gravitation acceleration from this figure: g=acceleration/(sinx) Where x is the angle of the air-track, let's say 3.523 degrees. How do I propagate uncertainty for this? I can calculate g easily, but I don't understand how I'm supposed to find a value for the +- bit. I don't know the uncertainty of the measured angle. My best guess would be that since I do not know the uncertainty of X, and thus I don't know the uncertainty of sin(x), I treat sin(x) like a precise number and divide acceleration's uncertainty by it to determine the uncertainty of g. Is this correct? If not, how do I do it?