Home
Class 12
PHYSICS
In the arrangement shown in the Fig, the...

In the arrangement shown in the Fig, the ends P and Q of an unstretchable string move downwards with uniform speed U. Pulleys A and B are fixed.
Mass M moves upwards with a speed

A

`V cos theta`

B

`V // cos theta`

C

`2V cos theta`

D

`2//V cos theta`

Text Solution

Verified by Experts

The correct Answer is:
B
` U cos theta=V`
`therefore U=(v)/(cos theta)`
Promotional Banner

Topper's Solved these Questions

  • NEWTONS LAWS OF MOTION

    ALLEN |Exercise EXERCISE-III|28 Videos

  • NEWTONS LAWS OF MOTION

    ALLEN |Exercise EXERCISE-I|52 Videos

  • NEWTON'S LAWS OF MOTION & FRICTION

    ALLEN |Exercise EXERCISE (JA)|4 Videos

  • RACE

    ALLEN |Exercise Basic Maths (Wave Motion & Dopplers Effect) (Stationary waves & doppler effect, beats)|25 Videos

Similar Questions

Explore conceptually related problems

In the arrangement shown in fig m_(1)=1kg, m_(2)=2 kg Pulleys are massless and string are light. For what value of M the mass m_(1) moves with constant velocity (neglect friction):

Three blocks with masses m, 2m and 3m are connected by strings as shown in the figure. After an upward force F is applied on block m, the masses move upward at constant speed v. What is the net force on the block of mass 2m

The pulley arrangements shown in figure are identical, the mass of the rope being negligible. In case I the mass m is lifted by attaching a mass 2m to the other end of rope with a constant downward force F =2mg , where g is acceleration due to gravity The acceleration of mass m in case I is .

A man of mass 70 kg stands on a weighing scale in a lift which is moving (a) upwards with a uniform speed of 10 m s 1, (b) downwards with a uniform acceleration of 5 ms^(2) , (c) upwards with a uniform acceleration of 5 ms^(2) . What would be the readings on the scale in each case ? (d) What would be the reading if the lift mechanism failed and it hurtled down freely under gravity ?

A man generates a symmetrical pulse in a string by moving his hand up and down. At t=0 the point in his hand moves downward. The pulse travels with speed of 3 m//s on the string & his hands passes 6 times in each second from the mean position. Then the point on the string at a distance 3m will reach its upper extreme first time at time t=

An electron with rest mass m_(0) moves with a speed of 0.8c.Its mass when it moves with this speed is…….

A helicopter of mass M is lowering a truck of mass m onto the deck of a ship. In first case the helicopter and the truck move downward together (the length of the cable remaine constant). Tension in the cable is T_(1) when their downward speed is decreasing at a rate of (g)/(10) . In second case when the truck gets close to the deck, the helicopter stops moving downward. While it hovers stationary, it lets out the cabel so that the truck is still moving downward. If the truck is moving downward with a speed decreasing at rate of (g)/(10) , tension in string is now T_(2) , What is ratio T_(1)//T_(2)

A charge +2q moves vertically upwards with speed v , a second charge -q moves horizontally to the right with the same speed v , and a third charge +q moves horizonatlly to the right with the same speed v . The point P is located a perpendicular distance a away from each charge as shown in the figure. The magnetic field at point P is

ALLEN -NEWTONS LAWS OF MOTION-EXERCISE-II
  1. The force on a rocket moving with a veloctiy 300 m/s is 210N. The rate...

    Text Solution

    |

  2. In the fig. mass M=10gm. Is placed on an inclined plane. In order to k...

    Text Solution

    |

  3. A machine gun fires bullets of 50gm at the speed of 1000m/sec. If an a...

    Text Solution

    |

  4. The mechanical advantage of a wheel axle is 5 what will be thereforce ...

    Text Solution

    |

  5. A body of mass 100g is sliding on a inclined plane with an inclination...

    Text Solution

    |

  6. As shown in figure a monkey of 20g mass is holding a light rope that p...

    Text Solution

    |

  7. A bird is sitting on the floor of a wire cage and the cage is in the h...

    Text Solution

    |

  8. Two bodies A (30 kg) and B (50 kg) tied with a light string are placed...

    Text Solution

    |

  9. Weight is defined as:-

    Text Solution

    |

  10. A string of length L and mass M is lying on a horizontal table. A forc...

    Text Solution

    |

  11. A man is standing on a sparing platform, Reading of spring balaance is...

    Text Solution

    |

  12. A rocket of mass 120kg. Is fired in the gravity free space is ejected ...

    Text Solution

    |

  13. If 100N force is applied to 10kg. block as shown in diagram then accel...

    Text Solution

    |

  14. If a ladder is not in balance against a smooth vertical wall, then it ...

    Text Solution

    |

  15. A block is dragged on a smooth plane with the help of a rope which mov...

    Text Solution

    |

  16. In the arrangement shown in the Fig, the ends P and Q of an unstretcha...

    Text Solution

    |

  17. A trolley of mass 5 kg on a horizontal smooth surface is pulled by a l...

    Text Solution

    |

  18. A weightless inextensible rope rests on a stationary wedge forming an ...

    Text Solution

    |

  19. If acceleration of M is a then acceleration of m is

    Text Solution

    |

  20. If acceleration of A is 2m//s^(2) to left and acceleration of B is 1m/...

    Text Solution

    |