(b) An automobile speedometer with circular scales reading both miles per hour and kilometers per hour is shown. What speed is indicated, in both units? How many significant figures are in the measurements?

Video transcript

Hello everyone today, we are being shown to speedometers and asked what are both of their readings and kilometers per hour and MPH. Were then asked how many significant figures should each reading have? So we'll start with one of the left, the MPH. We see that in between the 80 and one twenties this red meter. And so we see that right in between 80 and 1 20 is 100 so we can safely conclude that between 102 100 stands 10 and so this red meter is between 1 10 and 1 20. And so therefore we can conclude that this is 115 MPH according to our significant figure Rules. Each of these are non zero numbers and therefore are significant figures. Soma's per hour has three sig figs for significant figures for kilometers per hour. We see that this red meter is between 150 and one and 200. Right in the middle of 150 and 200 is and the middle point between 1 75 and 200 is about 1 81 90. According to that. We know that this must be 185 km/h. Once again, there are three non zero numbers. Therefore, this also must have three significant figures until this as our final answer, I hope this helped and until next time