Flaneur in the rain - iii

Classical Mechanics Level 3

Suppose you're sauntering about Saint-Germain, Paris, from one cafe to the next, staying only as long as it takes you to knock down a few Brilliant problems. You're wrapping up at Brasserie Lipp and want to go to Cafè de Flore, which is across the street.

The only problem is: it's pouring rain!

If you want to absorb as little water as possible, how quickly should you run across the road?


  • Approximate yourself as a shape with a vertical cross section of \(A_\text{head}\), and horizontal cross section \(A_\text{body} \).
  • The rain falls at terminal velocity \(v_\text{rain}\)
  • All the rain that hits your body is absorbed.
  • The width of the road is \(d\).

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