Solve the all parts of given question:
Question: I want to measure accurately the time it takes for the drum of my tumble dryer to complete one turn. I take my stopwatch and start it and then wait till the drum has turned 20 times before I stop it. I estimate that my reaction time limits the accuracy of both my starting and stopping the stopwatch to 0.3 s. I measure that 20 turns takes 17.4 s.
Part A: First, what is the error in my measurement of 20 turns?
Part B: What is the time it takes for one turn and its error?
I need help to determine the time it takes for one turn and its error.