Home
Class 12
PHYSICS
As shown in the figure, Tarzan travels f...

As shown in the figure, Tarzan travels from one place to another by swinging in the forest. Assume that the rope is just long enough to swing from point `A` to point `B`, what is his initial speed in order for him to reach point `B`?

A

`6ms^(-1)`

B

`4ms^(-1)`

C

`8ms^(-1)`

D

`2ms^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
D
Ans. (4)
By using work energy theorem `W=DeltaKE`
`-mg(0.2)=0-(1)/(2)mv^(2)rArrv=2ms^(-1)`
Promotional Banner

Topper's Solved these Questions

Similar Questions

Explore conceptually related problems

For the shown graph slope of graph from point A to point B :

A point charge +q is placed at origin O . The work done in taking another point charge -q from the point A to point B along the circular arc as shown in the figure is .

A ray of light is to travel from point A to point B in figure in the shortest possible time after reflecting from P. Then OP is ………cm.

What are the coordinates for the point on the line AB (see figure) that is three times as far from A as from B, and that is in between point A and B?

A ball is shown at an angle theta up to the top of a cliff of height L, from a point at a distance. L from the base, as shown in figure. Assuming that one of the following quantities is the initial speed required to make the ball hit right at the edge of the cliff, which one is it :-

The figure shows the path of a car moving around a circular recetrack . How many miles does the car travel in going from point A to Point B?

A ball with mass m is attached to the end of a rod of mass M and length l . The other end of the rod is pivoted so that the ball can move in a vartical circle. The rod is held in the horizontal position as shown in figure and then given just enough a downward push so that the ball swings down and just reaches the vertical upward position having zero speed there. Now answer the following questions. The initial speed given to the ball is

In circuit shown in figure, terminal X is brought from point A to B. Then reading of ammeter .

A particle of mass 20 g is released with an initial velocity 5m//s along the curve from the point A, as shown in the figure. The point A is at height h from point B. The particle slides along the frictionless surface. When the particle reaches point B, its angular momentum about O will be : (Take g=10m//s^2 ).

A smooth rope of mas m and length L lies in a heap on a smooth horizontal floor, with one end attached to a block of mass M . The block is given a sudden kick and instantaneously acquires a horizontal velocity of magnitude V_(0) as shown in figure 1. As the block moves to right pulling the rope from heap, the rope being smooth, the heap remains at rest. At the instant block is at a distance x from point P as shown in figure -2( P is a point on the rope which has just started to move at the given instant ) , choose correct options for next three question. The speed of block of mass M is

ALLEN-TEST PAPER-Exercise (Physics)
  1. Two identical blocks A and B each of weight 20N are placed on a fricti...

    Text Solution

    |

  2. Figure shows an At wood machine in which m(1)+m(2)=M is constant. Now ...

    Text Solution

    |

  3. As shown in the figure, Tarzan travels from one place to another by sw...

    Text Solution

    |

  4. Two equal rods joined at one end are kept on a smooth surface as shown...

    Text Solution

    |

  5. A three part rocket begins intact as a single object in distant outer ...

    Text Solution

    |

  6. A three part rocket begins intact as a single object in distant outer ...

    Text Solution

    |

  7. Five uniform circular plates, each of diameter D and mass m are laid o...

    Text Solution

    |

  8. In the figure, the L-shaped shaded piece is cut from a metal plate of ...

    Text Solution

    |

  9. The centre of mass of a non uniform rod of length L, whose mass per un...

    Text Solution

    |

  10. Find the center of mass(x,y,z) of the following structure of four iden...

    Text Solution

    |

  11. A thick uniform wire is bent into the shape of the letter “U” as shown...

    Text Solution

    |

  12. In the given figure four rods AB,BC,CD and DA have mass m, 2m, 3m and ...

    Text Solution

    |

  13. A uniformly thick plate in the shape of an arrow head has dimensions a...

    Text Solution

    |

  14. An object comprises of a uniform ring of radius R and its uniform chor...

    Text Solution

    |

  15. In a head on collision between two identical particles A and B moving ...

    Text Solution

    |

  16. A machine gun fires 10 bullets per second in horizontal direction. Mas...

    Text Solution

    |

  17. Ball A of mass 1kg moving right with speed 2m//s bounces off ball B o...

    Text Solution

    |

  18. A cricket ball of mass 160g is moving horizontally directly towards a ...

    Text Solution

    |

  19. A particle of mass 4 m which is at rest explodes into masses m, m & 2m...

    Text Solution

    |

  20. Two girls of equal mass m jump off from the border line of a stationar...

    Text Solution

    |