Estimate the average speed with which the hair on your head grows...

Question

Estimate the average speed with which the hair on your head grows. Give your answer in both m/s and m/hour. Briefly describe how you arrived at this estimate.

Accepted Answer

Welcome back everybody. We are told that we cut half an inch off of fingernail every two weeks and we want to express this in terms of meters per second and meters per hour. So here's what we're going to need to do. We're going to have to convert using unit conversions. Right? So let's go ahead and start with part one. Here. We know that there are 39.37" in one m. So that takes care of that conversion In one week we have seven days in one day, there are 24 hours and in one hour we have 3600 seconds. We'll see once again that all of our units will cancel out. And once you multiply straight across, we get that This speed is equivalent to 1. times 10 to the negative eight m/s. Great. Now using our answer from part one, let's go ahead and find part two here. We want to express this in terms of meters per hour. So we have 1.5 times 10 to the negative eight m per one second. We know that there are 3600 seconds in one hour. These units are going to cancel out and multiplying straight across. We get 3.78 times 10 to the negative fifth meters per hour. Now we have found it in terms of meters per second in meters per hour, which corresponds to our answer choice of E. Thank you all so much for watching. Hope this video helped. We will see you all in the next one

Estimate the average speed with which the hair on your head grows. Give your answer in both m/s and m/hour. Briefly describe how you arrived at this estimate.

Watch next