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#### Question

A man walking briskly in rain with speed *v *must slant his umbrella forward making an angle θ with the vertical. A student derives the following relation between θ and *v*: tan θ = *v* and checks that the relation has a correct limit: as *v* →*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.

#### Solution

#### Similar questions

Fill in the blanks :-

The relative density of lead is 11.3. Its density is ....g cm^{–3}or . ...kg m^{–3}.

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State the number of significant figures in the following

0.2370 g cm^{–3}

State the number of significant figures in the following:

6.032 N m^{–2}

Just as precise measurements are necessary in science, it is equally important to be able to make rough estimates of quantities using rudimentary ideas and common observations. Think of ways by which you can estimate the following (where an estimate is difficult to obtain, try to get an upper bound on the quantity):-

the wind speed during a storm