Question

Rain drops fall vertically at a speed of `20m//s`. At what angle do they fall on the wind screen of a car moving with a velocity of `15m//`, if the wind screen velocity incined at an agle of `23^(@)` to the vertical `("cot"^(-1)4/3~~37^(@))`
A. `60^(@)`
B. `30^(@)`
C. `45^(@)`
D. `90^(@)`

Answer 1

(a) `tan (90^(@)-theta)=20/15`
`:. cot theta=20/15=4/3`
`impliestheta=37^(@)`
`:. alpha=37^(@)+23^(@)=60^(@)`