Alexmahone said:Bob owns a couple of hourglasses -- one is a 4 minute hourglass and the other is a 7 minute hourglass. If Bob wants to measure 9 minutes, how could he do it?
CaptainBlack said:Start then together, turn the 4 when it is emply.
When the 7 is empty turn the 4.
At this point it has 1 minute to go...
Alexmahone said:Now there are 3 minutes remaining in the 7.
When the 7 is empty there is 1 minute remaining in the 4. So why would you want to turn it?
CaptainBlack said:Start then together, turn the 4 when it is emply. When the 7 is empty start timing the nine minutes, at this point the four minute glass has 1 minute to go. When empty turn it, 5 minutes have elapsed. Turn it again, and when empty 9 minutes have elapled.
CB
Alexmahone said:Hint: There is a solution that wastes no time and measures 9 minutes in one go.
"Bob's 9 Minute Hourglass Challenge" is a scientific experiment designed by Bob to test the accuracy and precision of an hourglass timer. The challenge involves flipping the hourglass twice and trying to stop it at exactly the 9-minute mark.
The challenge requires an hourglass timer that measures 9 minutes. It is set up by flipping the hourglass twice and trying to stop it at exactly 9 minutes. Participants can use any method to try and stop the hourglass, such as tapping the glass or blowing on the sand.
Yes, anyone can participate in the challenge as long as they have access to a 9-minute hourglass timer. It is a fun and simple experiment that anyone can try at home.
The purpose of the challenge is to test the accuracy and precision of an hourglass timer. By attempting to stop the timer at exactly 9 minutes, participants can see how close they can come to the target time and how consistent their results are.
Through this challenge, we can learn about the accuracy and precision of hourglass timers. It can also teach us about time management and the importance of having accurate measurements in scientific experiments.