InterviewSolution
Saved Bookmarks
InterviewSolution
| 1. |
Rain is falling vertically with a speed of 20 ms^(-1)A person is running in the rain with a velocity of 5 ms^(-1)and a wind is also blowing with a speed of 15 ms^(-1). (both from the west). The angle with the vertical at which the person should hold his umbrella so that he may not get drenched is: |
Answer» Solution : `vecV_("rain") =vecV_(R) =20(-hatk)` `vecV_("man") =vecV_(M) =5hati` RESULTANT velocity of rain and wind = `vecV_(RM) =-20vecK + 15hati` Now, Velocity of Rain relative to man= `vecV_(RM) -vecV_(M) = (-20 hatK +15 HATI)-(5hati)` `=-20hatK + 10hati` `tan alpha =1/2 rArr alpha =tan^(-1) 1/2` |
|