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Rain is falling vertically. A man runnin...

Rain is falling vertically. A man running on the road keeps his umbrella tilted but a man standing on the street keeps his umbrella vertical to protect himself from the rain. But both of them keep their umbrella vertical to avoid the vertical sun-rays. Explain.

Answer

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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 man is coming down an incline of angle 30^@ . When he walks with speed 2(sqrt(3)) m s^-1 he has to keep his umbrella vertical to protect himself from rain. The actual speed of rain is 5 ms^-1 . At angle with vertical should he keep his umbrella when he is at rest so that he does not getb drenched ? .

Knowledge Check

  • The rain is falling vertically downwards. A man walking on the road holds his umberalla tilted. Now, suddenly the rain stop and there is afternoon sun just above the head. In order to protect himself from sun-rays, he holds the umbrella vertical. The reason assigned can be

    A
    The speed of light is much higher than the speed of rain drops.
    B
    The speed of light is much higher than the speed of man.
    C
    Actually, the angle of tilt of umbrela in sun-light is very small in comparison to the angle of tilt of umbrella in rain.
    D
    light is behaving as a wave, not as a particle here.

  • Rain is falling vertically at 10sqrt(3) kph. A man is running at 10 kph. The angle with vertical at which he should hold his umbrella is

    A
    `60^(@)`
    B
    `45^(@)`
    C
    `30^(@)`
    D
    `15^(@)`

  • When it is raining vertically down, to a man walking on road the velocity of rain appears to be 1.5 times his velocity.To protect himself from rain he should hold the umbrealla at an angle theta to vertical. The tan theta=

    A
    `2/sqrt5`
    B
    `sqrt5/2`
    C
    `2/3`
    D
    `3/2`

    • Similar Questions

    Explore conceptually related problems

    A man is coming down an incline of angle 30^(@) . When he walks with speed 2sqrt(3)m//s he has to keep his umbrella vertical to protect hismself from rain. The actual speed of rain is 5m//s . At what angle with vertical should he keep his umbrella when he is at rest so that he does not get drenched ?

    A man moving in rain holds his unbrella inclined to the vertical even though the rain drops are falling vertically downwards . Why ?

    Rain is falling vertically and a man is moving with velocity 6 m s^-1 . Find the angle at which the man should hold his umbrella to aboved getting wet.

    Statement -1 : A man standing on the ground has to hold his umbrella at an angle theta with the vertical to protect himself from rain. It is possible that the man now starts running on the ground with certain speed, but he still has to hold his umbrella at angle theta with the vertical to protect himself from rain. Statement -2 : Vertical component of velocity of rain w.r.t man does not change. if he starts running on a horizontal ground.

    An open merry go round rotates at an angular velocity omega .A person stands in it at a distance r from the rotational axis.It is raining and the rain drops falls vertically at a velocity v_(0) .How should the person hold an umbrella to prorect himself from the rain in the best way.Angle made by umbrealla with the vertical is

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