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A man walking briskly in rain with speed υ must slant his umbrella forward making an angle θ with the vertical. A student derives the following relation between θ and v : tan q = υ and checks that the relation has a correct limit: as υ→0, θ →0, as expected. (We are assuming there is no strong wind and that the rain falls vertically for a stationary man). Do you think this relation can be correct ? If not, guess the correct relation. |
| Answer» A man walking briskly in rain with speed υ must slant his umbrella forward making an angle θ with the vertical. A student derives the following relation between θ and v : tan q = υ and checks that the relation has a correct limit: as υ→0, θ →0, as expected. (We are assuming there is no strong wind and that the rain falls vertically for a stationary man). Do you think this relation can be correct ? If not, guess the correct relation. | |