What is rain man concept?
Answers
Answer:
Illustration : A man holds his umbrella vertically up while walking due west with a constant velocity of magnitude vm = 1.5 m/sec in rain. To protect himself from rain, he has to rotate his umbrella through an angle φ = 30° when he stops walking. Find the velocity of the rain.
Solution :
vr-> = vrm-> + vm->
Since , vrm-> ⊥ vm->
we obtain,Sinφ = vm/vr
⇒vr = vm cosec φ
⇒ vr = (1.5 m/sec) cosec 30° = 3m/sec .
Exercise : A boy is running on a horizontal road with a velocity of 5 m/s. At what angle should he hold his umbrella in order to protect himself from the rain, if it is raining with a velocity of 10 m/s vertically downward
Rain refers to the drops of water than fall from the sky. This occurs due to the condensation of water vapour from the atmosphere. It is major source of freshwater. It can be in the form of snow or hail, thus it is called as precipitation.