Home
Class 11
PHYSICS
A man is swimming upstream over a river...

A man is swimming upstream over a river such that he appears to be at rest with respect to the shore.Is he doing work?

Text Solution

Verified by Experts

Yes.IN this case there is displacement with respect to water and he is applying force.
Promotional Banner

Topper's Solved these Questions

  • WORK,ENERGY AND POWER

    BINA LIBRARY|Exercise EXERCISE|83 Videos

  • WAVES

    BINA LIBRARY|Exercise EXERCISE|97 Videos

Similar Questions

Explore conceptually related problems

A man standing on a bank of a river found that the angles of elevation of a tree on the other bank of the river is 60^@ .By retiring 40m back,he found the angle of elevation to be 30^@ .Find the height of the tree and the breadth of the river.

A man sitting at a height of 20m in a tall tree on a small island in the middle of the river observes two poles directly opposite each other on the two banks of river and in line with the foot of the tree. If the angles of depression of the feet of the poles from a point at which the man is sitting on the three on either side of the river are 60° and 30° respectively. Find the width of the river.

(a) A child stands at the centre of a turntable with his two arms outstretched. The turntable is set rotating with an angular speed of 40 rev/min. How much is the angular speed of the child if he folds his hands back and thereby reduces his moment of inertia to 2/5 times the initial value? Assume that the turntable rotates without friction. (b) Show that the child’s new kinetic energy of rotation is more than the initial kinetic energy of rotation. How do you account for this increase in kinetic energy?

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?

A swimmer can swim with Velocity of 10 km/h. w.r.t, the water flowing in a river with velocity of 5 km/h. In what direction should he swim to reach the point on the other bank just opposite to his starting point?

Amit buys few grams of gold at the poles as per the instruction of one of his friends. He hands over the same when he meets him at the equator. Will the friend agree with the weight of gold bought? If not, why?

A man inside an insulated metallic cage does not receive a shock, when the cage is connected to a high voltage source. He may get a severe shock, if he tries to step out of it. Discuss.

Who first traced the path of carbon in the biosynthetic phase? How did he do it?

A man travels 1 mile due east then 5 mile due south then 2 mile due east and finally 9 mile due north how far is' he from -the starting point

BINA LIBRARY-WORK,ENERGY AND POWER-EXERCISE
  1. Two bodies having masses 1g and 4g are moving with equal K.E find the ...

    Text Solution

    |

  2. water of a river is striking the pillar of a bridge.Is work being done...

    Text Solution

    |

  3. A man is swimming upstream over a river such that he appears to be at...

    Text Solution

    |

  4. How much work is done on a body of mass m in moving it around a horizo...

    Text Solution

    |

  5. Give an example where work done by a force is zero.

    Text Solution

    |

  6. What is the power needed to maintain uniform circuler motion?

    Text Solution

    |

  7. Can a body have energy without having momentum?

    Text Solution

    |

  8. A ballon filled with hydrogen rises upward gaining both kinetic and po...

    Text Solution

    |

  9. A man of mass 60 kg walks up to the top of a building of height 15 m....

    Text Solution

    |

  10. A man cycles up a hill whoes slope is 1 m in 25 at the rate of 10 km/h...

    Text Solution

    |

  11. A bullet of mass 12 g strikes a soild surface at a speed of 400m/s. It...

    Text Solution

    |

  12. A body of mass 1kg falls from the top of a cliff 50 m high and buries...

    Text Solution

    |

  13. A force of 1000 dynes acts on a particle of mass 500 g for 10seconds....

    Text Solution

    |

  14. Calculate the power of a motor in kilo-watt ,which is capable of risin...

    Text Solution

    |

  15. A pump lifts 20 kg of water in one minute to a vertical height of 30m....

    Text Solution

    |

  16. Two bodies having masses 1g and 4g are moving with equal K.E find the ...

    Text Solution

    |

  17. A 200 g ball falls from rest through air. If its speed is 10 m/s after...

    Text Solution

    |

  18. A bullet of mass 100 g strikes a wooden plank with a velocity of 300ms...

    Text Solution

    |

  19. A force of 100 dynes acts on a particle of mass 0.5 kg for 10 sec. Cal...

    Text Solution

    |

  20. An engine lifts 200kg of metal to a vertical height of 30 m in one min...

    Text Solution

    |