Though the rain is falling vrrtically down-wards, the fromt screen ot a moving car gers wet while the back screen remains dry. Whay ?

A glass wind screen whose inclination with the vertical can be changed is mounted on a car. The moves horizontally with a speed of 2m//s . At what angle alpha with the vertical should the wind screen placed so that the rain drops falling vertically downwards with velcoity 6m//s strike the wind screen perpendicularly?

A man is moving with 10 m//s towards west on a horizontal ground. He observed that the rainfall is falling vertically down wards. Now he increases his speed to 15 m//s and find that now the rainfall at an angle of 45^(@) towards him. The speed of the rain with respect to ground is :

A girl riding a bicycle with a speed of 5 m//s to wards Noth direction, observes rain falling vertically down. If she increases her speed to 10 m//s , rain appeard to meet her at 45^@ to the vertical . What is the speed ot the rain ? In what direction does rain fall as observed by a ground based observer ?

A vertical wind screen of a car is made up of two parts, as shown in figure, where the upper one A is 25cm vertically long and covers the 5cm of the lower piece B.The upper one is hinged at the top so that it can be opened outward, inclining to the vertical. The car is running on the horizontal road at 60km/hr in the rain which is falling vertically at 20km/hr. Find the maximum angle, through which the upper part A can be opened outward, such that the rain drops do not enter the car.

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 glass wind screen whose inclination with the vertical can be changed, is mounted on a car as shwon in figure. The cart moves uniformly along the horizontal path with a speed of 6m//s . At what maximum angle a to the vertical can be wind scrren be placed so that the rain drops falling vertically downwards with velcoity 2m//s , do not enter the cart?