Module 2.1: How fast and at what angle should you walk in the rain to get least wet?

MIT 8.01SC Physics I: Classical Mechanics, Fall 2010 View the complete course: Instructor: Walter Lewin License: Creative Common…
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14 Replies to “Module 2.1: How fast and at what angle should you walk in the rain to get least wet?”

  1. His equation is correct. In fact this problem is to find the projected area of rectangle. Ellipsoid. Ellipse. Or cylinder. On this problem. U can check the paper. In google. Title. The best strategy. That paper will show all the cases. Two dimensional. Three dimensional. Elipse. Ellipsoid. Rectangular. Cylinder. And the moving object can change his angle. Moreover it will show . It will move in the same´╗┐ time. The result will be interesting.

  2. In my country the intensity of rain is measured in mm/hour, which of course doesn’t state directly´╗┐ the volume of water per time but assuming the dimensions of the prisms representing Mary and Peter and their rate of displacement are known and constant, one can easily solve of m3 of water per m3 of space, thus obtaining the volume of water the prims formed by Peter’s and Mary’s trajectory would encounter. Any thoughts about that?

  3. This solution doesn’t seem correct. It might reveal witch is better between walking and running given the same intensity of rain. But the eq. seems not so accurate when one wants to quantify the amount of water one would carry on its body when it arrives home. The eq. isn’t considering the density of water available in the atmosphere,´╗┐ in other words, it says that if it rains 0.1 m3 of water per cubic meter of atmosphere in their paths is the same as if it would have rained 100 m3 of water per m3

  4. The initial idea presented was to determine if more water will fall on them if they walk slow, or fast, so why did he turn it into something general with variables, NOW I NEED TO CALCULATE IT MYSELF AND FIND OUT!!! I know by experience,´╗┐ running through hard rain will get less water, or so I think!

  5. I just began to´╗┐ watch the video and wonder if anyone else noticed the fact that this calculation requires two main components not considered, the first component is the distance of each droplet from each other. Second is the amount of water that hits the ground within a certain´╗┐ amount of time, which can determine the first, so perhaps we should calculate it with the amount of water in 3 cubic meters. Let me know if I’m wrong, I didn’t think it through because the video just started.

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