Home
Class 12
PHYSICS
A man wishes to swim across a river 40 m...

A man wishes to swim across a river 40 m wide flowing with a speed of 3m/s. such that he reaches the point just infront on the other bank in time not greater than 100s. The angle made by the direction he swims and river flow direction is :-

A

`90^(@)`

B

`127^(@)`

C

`150^(@)`

D

`143^(@)`

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Topper's Solved these Questions

  • KINEMATICS-2D

    ALLEN |Exercise Exercise (O-1)|40 Videos

  • GRAVITATION

    ALLEN |Exercise EXERCISE 4|9 Videos

  • MOTION IN A PALNE

    ALLEN |Exercise SOLVED EXAMPLE|28 Videos

Similar Questions

Explore conceptually related problems

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 man is crossing a river flowing with velocity of 5m//s . He reaches a point directly across at a distance of 60m in 5 sec. His velocity in still water should be

A river 3m deep and 40m wide is flowing at the rate of 2 km/hr. How much water will fall into the sea in 2 minutes :-

A river 3 m deep and 40 m wide is flowing at the rate of 2 km per hour. How much water will fall into the sea in a minute?

In the figure there is a long horizontal bridge over a river 75 m high from water surface. A strong man throws a stone in the parallel plane of the bridge. A observer in a car travelling on the bridge finds the stone going pass by the car while ascending and also while descending between two points on the road 30 m away. The car is travelling at a speed of 15 m/s. The stone is thrown from the bank of river just at the same level of water. Horizontal distance AB travelled by stone is :-

In the figure there is a long horizontal bridge over a river 75 m high from water surface. A strong man throws a stone in the parallel plane of the bridge. A observer in a car travelling on the bridge finds the stone going pass by the car while ascending and also while descending between two points on the road 30 m away. The car is travelling at a speed of 15 m/s. The stone is thrown from the bank of river just at the same level of water. What is the angle the velocity makes with the bridge when it goes past the car while ascending ?

Velocity of a boat relative to river current and river current velocity are equal in magnitude. Starting from point A on the southern bank, the boatman wants to reach a point B on the nothern bank in north - east from A . In which direction he has to steer the boat?

A rocket is moving in a gravity free space with a constant acceleration of 2 m//s^(2) along + x direction (see figure). The length of a chamber inside the rocket is 4 m . A ball is thrown from the left end of the chamber in + x direction with a speed of 0.3 m//s relative to the rocket . At the same time , another ball is thrown in + x direction with a speed of 0.2 m//s drom its right end relative to the rocket . The time in seconds when the two balls hit each other is

In the figure there is a long horizontal bridge over a river 75 m high from water surface. A strong man throws a stone in the parallel plane of the bridge. A observer in a car travelling on the bridge finds the stone going pass by the car while ascending and also while descending between two points on the road 30 m away. The car is travelling at a speed of 15 m/s. The stone is thrown from the bank of river just at the same level of water. What is the distance between car and atone at the instant when particle reaches at point B ?

A cyclist is riding with a speed of 27 km /h . As he approaches a circular turn on the road of radius 80 m , he applies brakes and reduces his speed at the constant rate of 0.50m//s every second . What is the magnitude and direction of the net acceleration of the cyclist on the circular turn ?

ALLEN -KINEMATICS-2D-Exercise (O-2)
  1. Man A is sitting in a car moving with a speed of 54 (km)/(hr) observes...

    Text Solution

    |

  2. A swimmer swins in still water at a speed =5 km//hr. He enters a 200m ...

    Text Solution

    |

  3. A man wishes to swim across a river 40 m wide flowing with a speed of ...

    Text Solution

    |

  4. An observer on ground sees a boat cross a river of width 800 m perpend...

    Text Solution

    |

  5. A boatman moves his boat with a velocity 'v' (relative to water) in ri...

    Text Solution

    |

  6. A ball is thrown at an angle theta up to the top of a cliff of height ...

    Text Solution

    |

  7. A projectile of mass 1kg is projected with a velocity of sqrt(20)m//s ...

    Text Solution

    |

  8. A particle is moving with a position vector, vec(r)=[a(0) sin (2pi t) ...

    Text Solution

    |

  9. A point mass is moving in the x-y plane. Its acceleration is a constan...

    Text Solution

    |

  10. A ball is thrown from ground such that it just crosses two poles of eq...

    Text Solution

    |

  11. Position vector of a particle is expressed as function of time by equa...

    Text Solution

    |

  12. A projectile is thrown with speed u into air from a point on the horiz...

    Text Solution

    |

  13. A block is thrown with a velocity of 2m//s^(-1) (relative to ground) o...

    Text Solution

    |

  14. A man on a rectilinearly moving cart, facing the direction of motion, ...

    Text Solution

    |

  15. A cubical box dimension L = 5//4 m starts moving with an acceleration ...

    Text Solution

    |

  16. A large rectangular box moves vertically downward with an acceleration...

    Text Solution

    |

  17. In the figure there is a long horizontal bridge over a river 75 m high...

    Text Solution

    |

  18. In the figure there is a long horizontal bridge over a river 75 m high...

    Text Solution

    |

  19. In the figure there is a long horizontal bridge over a river 75 m high...

    Text Solution

    |

  20. From the ground level, a ball is to be shot with a certain speed. Grap...

    Text Solution

    |