Home
Class 12
PHYSICS
A swimmer wands to cross a river and rea...

A swimmer wands to cross a river and reach point `B` directly from `A`. The speed of the wimmer in still river and that of river flow are same. The dotted line `AN` is normal to flow direction of river. For swimmer to reach point `B`, the angle his velocity relative to river will make with line AN is given by `theta`. then the value of `theta` is :

A

`60^(@)`

B

`30^(@)`

C

`45^(@)`

D

`0^(@)`

Text Solution

Verified by Experts

The correct Answer is:
B
Since the speed of river flow and the person is same, the resultant direction AB is
such theta `(90 + theta)/(2) = 60 rArr theta = 30^(@)`
Promotional Banner

Topper's Solved these Questions

  • DAILY PRACTICE PROBLEM

    RESONANCE ENGLISH|Exercise DPP No.16|9 Videos

  • DAILY PRACTICE PROBLEM

    RESONANCE ENGLISH|Exercise DPP No.17|20 Videos

  • DAILY PRACTICE PROBLEM

    RESONANCE ENGLISH|Exercise DPP No.14|9 Videos

  • CURRENT ELECTRICITY

    RESONANCE ENGLISH|Exercise High Level Problems (HIP)|19 Videos

  • ELECTRO MAGNETIC WAVES

    RESONANCE ENGLISH|Exercise Exercise 3|27 Videos

Similar Questions

Explore conceptually related problems

A swimmer wants to cross a 200 m wide river which is flowing at a speed of 2 m/s. the velocity of the swimmer with respect to the river is 1 m/s. how far from the point directly opposite to the starting point does the swimmer reach the opposite bank ?

A swimmer wants to directly reach the point B starting from A. The river is flowing along x-axis. If the velocity of the swimmer is sqrt(2)/(3) times the velocity of the river, find the angle theta from the line AB at which his swimming effort should be directed.

A swimmer crosses a river of width d flowing at velocity v. While swimming, he keeps himself always at an angle of 120^(@) with the river flow and on reaching the other end. He finds a drift of d/2 in the direction of flow of river. The speed of the swimmer with respect to the river is :

A swimmer starts to swim from point a to cross a river. He wants to reach point B on the opposite side of the river. The line AB makes an angle 60^(@) with the river flow as shown. The velocity of the swimmer in still water is same as that of the water (i) In what direction should he try to direct his velocity ? Calculate angle between his velocity ? Calculate angle between his velocity and river velocity. (ii) Find the ratio of the time taken to cross the river in this situation to the minimum time in which he can cross this river.

A swimmer wishes to reach directly opposite bank of a river, flowing with velocity 8 m/s. The swimmer can swim 10 m/s still water. The width of the river is 480 m. Time taken by him to do so:

A boat man can row with a speed of 10 km h^(-1) in still water. If the river flows steadily at 5 km //h , in which direction should the boatman row in order to reach a point on the other bank directly opposite to the point from where he stared ? The width of the river is 2 km .

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:-

A river of width 80m is flowing at 6 m/s. A motorboat crosses the river in 10s and reaches a point directly across on the other river bank. The velocity of motorboat in still water is :

A man swims across a river with speed of V_(m) perpendicular to the flow direction of river. If the water flows with a speed V_(w) with what resullant velocity does the man cross the river ?

A man who can swim at a velocity v relative to water wants to cross a river of width b, flowing with a speed u.

RESONANCE ENGLISH-DAILY PRACTICE PROBLEM-DPP No.15
  1. At what angle with the horizontal should a ball be thrown so that the ...

    Text Solution

    |

  2. The velocity time graph of a body is shown in fig. it indicates that :

    Text Solution

    |

  3. A frictionless wire is fixed between A and B inside a circle of radius...

    Text Solution

    |

  4. Two separate monochromatic light beams A and B of the same intensity (...

    Text Solution

    |

  5. When a centimeter thick surface is illuminated with light of wavelengt...

    Text Solution

    |

  6. A ball is thrown vertically upwards with an initial velocity of 5 m//s...

    Text Solution

    |

  7. The maximum kinetic energy of photoelectrons emitted from a surface wh...

    Text Solution

    |

  8. The block of mass m is being pulled by a horizontal force F=2mg applie...

    Text Solution

    |

  9. A radiation of energy E falls normally on a perfectly reflecting surfa...

    Text Solution

    |

  10. A man stands on a weighing machine kept inside a lift . Initially , t...

    Text Solution

    |

  11. Ratio of the ranges of the bullets fired from a gun ( of constant muzz...

    Text Solution

    |

  12. A girl holds a book of mass m against a vertical wall with a horizonta...

    Text Solution

    |

  13. A uniform sphere of weight w and radius 3m is being held by a string o...

    Text Solution

    |

  14. The angles of refraction of a very thin prism is 1^(@). A light say is...

    Text Solution

    |

  15. A swimmer wands to cross a river and reach point B directly from A. Th...

    Text Solution

    |

  16. A gaint refracting telescope at an observatory has an objective lens o...

    Text Solution

    |

  17. Find the acceleration of the 6 kg block in the figure. All the surface...

    Text Solution

    |

  18. A ray of light on a transparent sphere with centre C as shown in the f...

    Text Solution

    |

  19. An object is seen thorugh a simple microscope of focal length 12 cm. F...

    Text Solution

    |

  20. Two inclined planes OA and OB having inclination (with horizontal) 30^...

    Text Solution

    |