Home
Class 11
PHYSICS
A man can swim with a speed of 4.0 km/h...

A man can swim with a speed of 4.0 km/h in still water . How long does he take to cross a river 1.0 km wide if the river flows steadily at 3.0 km/h and he makes his strokes normal to the river current ? How far down the river does he go when he reaches the other bank ?

Text Solution

Verified by Experts

The correct Answer is:
15 min , 750 m
Promotional Banner

Topper's Solved these Questions

  • MOTION IN A PLANE

    NCERT GUJARATI|Exercise EXCERCISES|30 Videos

  • MECHANICAL PROPERTIES OF SOLIDS

    NCERT GUJARATI|Exercise Exercises|16 Videos

  • MOTION IN A STRAIGHT LINE

    NCERT GUJARATI|Exercise ADDITIONAL EXERCISES|5 Videos

Similar Questions

Explore conceptually related problems

A boat man can row with a speed of 10 km/hr. in still water. The river flow steadily at 5 km/hr. and the width of the river is 2 km. if the boat man cross the river with reference to minimum distance of approach then time elapsed in rowing the boat will be:-

A man can swim at the rate of 5 kmh^(-1) in still water A. One km wide river flows at the rate of 3 kmh^(-1) . The man wishes to swim across the river directly opposite to the starting point. How much time will be take to cross the river

A boat can be rowed at 5 m/s on still water. It is used to cross a 200m wide river from the south bank to the north bank. The river current has uniform velocity of 3 m/s due east. (a) In which direction must it be steered to cross the river perpendicular to current ? (b) How long will it take to cross the river in a direction perpendicular to the river flow ? (c) In which direction must the boat be steered to cross the river in minimum time ? How far will it drift ?

A man can swim at a speed 2ms^(-1) in still water. He starts swimming in a river at an angle 150^(@) with direction of flow of water and reaches at the exactly oppsite point on the opposite bank. (a) Find the speed of flowing water. (b) If width of river is 1 km then calculate the time taken also

Boat moves with velocity 5 m/s on still water. It is steered perpendicular to the river current. (a) Will it reach point B or somewhere else on the other bank ? (b) How long will it take to cross the river? (c) How far down stream, will it reach the other bank ? (d) Does it take minimum time in this way ?

A swimmer swins in still water at a speed =5 km//hr . He enters a 200m wide river, having river flow speed =4km//hr at point A and proceeds to swim at an angle of 127^(@) (sin 37^(@) = 0.6) with the river flow direction. Another point B is located directly across A on the other side. the swimmer lands on the other bank at a point C , form which he walks the distance CB with a speed = 3km//hr . The total time in which he reaces from A to B is

A river 400 m wide is flowing at a rate of 2.0 m//s. A boat is sailing at a velocity of 10.0 m//s with respect to the water In a direction perpendicular to the river. (a) Find the time taken by the boat to reach the opposite bank. (b) How far from the point directly opposite to the starting point does the boat reach the opposite bank?

A man wishes to swim across a river 0.5km. wide if he can swim at the rate of 2 km/h. in still water and the river flows at the rate of 1km/h. The angle (w.r.t. the flow of the river) along which he should swin so as to reach a point exactly oppposite his starting point, should be:-

Two swimmers start a race. One who reaches the point C first on the other bank wins the race. A makes his strokes in a direction of 37^(0) to the river flow with velocity 5km//hr relative to water. B makes his strokes in a direction 127^(0) to the river flow with same relative velocity.River is flowing with speed of 2km//hr and is 100m wide.speeds of A and B on the ground are 8km//hr and 6km//hr respectively.

A man crosses a river in a boat. If he cross the river in minimum time he takes 10 min with a drift 120 m. If he crosses the river taking shortest path, he takes 12.5 min, find (a) width of the river (b) velocity of the boat with respect to water (c) speed of the current

NCERT GUJARATI-MOTION IN A PLANE-EXCERCISES
  1. A passenger arriving in a new town wishes to go from the station to a ...

    Text Solution

    |

  2. Rain is falling vertically with a speed of 30 ms^(-1) . A woman rides ...

    Text Solution

    |

  3. A man can swim with a speed of 4.0 km/h in still water . How long doe...

    Text Solution

    |

  4. In a harbour , wind is blowing at the speed of 72 km/h and the flag on...

    Text Solution

    |

  5. The celling of a long hall is 25 m high What is the maximum horizontal...

    Text Solution

    |

  6. A cricketer can throw a ball to a maximum horizontal distance of 100 m...

    Text Solution

    |

  7. A stone tied to the end of astring 80 cm long is whirled in a horizon...

    Text Solution

    |

  8. An aircraft executes a horizontal loop of radius 1.00 km with a steady...

    Text Solution

    |

  9. Read each statement below carefully and state , with reasons , if it i...

    Text Solution

    |

  10. The position of a particle is given by r=3.0hati-2.0t^(2)hatj+4.0...

    Text Solution

    |

  11. A particle starts from the origin at t=0 s with a velocity of 10.0hatj...

    Text Solution

    |

  12. hatiandhatj are unit vectors along x - and y- axis respectively . What...

    Text Solution

    |

  13. For any arbitrary motion in space , which of the following relations a...

    Text Solution

    |

  14. Read each statement below acrefully and state , with reasons and exam...

    Text Solution

    |

  15. An aircraft is flying at a height of 3400 m above the ground . If th...

    Text Solution

    |

  16. A very has magnitude and direction . Does it have a location in space...

    Text Solution

    |

  17. A vector has both magnitude and direaction . Does it mean that anythin...

    Text Solution

    |

  18. Can you associate vectors with (a) the length of a wire bent into a lo...

    Text Solution

    |

  19. A bullet fired at an angle of 30^(@) with the horizontal hits the grou...

    Text Solution

    |

  20. A fighter plane flying horizontally at an altitude of 1.5 km with spe...

    Text Solution

    |