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 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?

A pipe which can be swiveled in a verticle plane is mounted on a cart . The cart moves uniformly along a horizontal path with a velocity v_(1) = 2m//s . At what angle alpha ot the horizontal should the pipe be placed so that drop of rain falling verticle with a velcoity v_(2) = 6m//s move parallel to the walls of the pipe without touching them .

Rain is falling vertically with a speed of 30 m/s. from East to West direction. At what the angle with the vertical, he sees the rain falling?

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 him self from the rain if the rain is falling vertically with a velocity of 10 m/s?

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 him self from the rain if the rain is falling vertically with a velocity of 10 m/s?

·A pipe which can be swivelled in a vertical plane is mounted on a cart (see Fig. lE.122). The cart moves uniformly along a horizontal path with speed v_(1)=2m//s . At what angle a to the horizon should the pipe be placed so that drops of rain falling plumb with a velocity v_(2)=6m//s move parallel to the walls of the pipe without touching them? Consider the velocity of the drope as constant due to the resitance of air.