Home
Class 12
PHYSICS
A man is standing on a weighing machine ...

A man is standing on a weighing machine with a block in his hand. The machine records w. When he takes the block upwards with some acceleration the machine records `w_(1).` When he takes the block down with some acceleration, the machine records `w_(2).` Then choose correct option

A

`w_(1)=w=w_(2)`

B

`w_(1)ltwltw_(2)`

C

`w_(2)ltwltw_(1)`

D

`w_(2)=w_(1)gtw`

Text Solution

Verified by Experts

The correct Answer is:
C
Promotional Banner

Topper's Solved these Questions

  • NEWTON'S LAWS OF MOTION & FRICTION

    ALLEN |Exercise EXERCISE (O-2)|31 Videos
  • NEWTON'S LAWS OF MOTION & FRICTION

    ALLEN |Exercise EXERCISE (JM)|6 Videos
  • NEWTON'S LAWS OF MOTION & FRICTION

    ALLEN |Exercise EXERCISE (S-2)|9 Videos
  • MOTION IN A PALNE

    ALLEN |Exercise SOLVED EXAMPLE|28 Videos
  • NEWTONS LAWS OF MOTION

    ALLEN |Exercise EXERCISE-III|28 Videos

Similar Questions

Explore conceptually related problems

A boy standing on a weighing machine notices his wight as 400 N. When he suddenly jumps upward the weight shown by the machine becomes 600 N. The acceleration with which the boy jumps up is : (Take g=10m//s^(2) )

A carpenter of mass 50 kg is standing on a weighing machine placed in a lift of mass 20 kg. A light sring is attached to the lift. The string passes over a smooth pulley and the other end is held by the carpenter as shown. When carpenter keeps the lift moving upward with constant velocity :- (g=10m//s^(2))

A wooden block of mass 2 kg rests on a soft horizontal floor. When an iron cylinder of mass 25 kg is placed on top of the block, the floor yields steadily and the block and the cylinder together go down with an acceleration of 0.1 m s^(-2) . What is the action of the block on the floor (a) before and (b) after the floor yields ? Take g = 10 m s^(-2) . Identify the action-reaction pairs in the problem.

A man runs at a speed of 4m//s to overtake a standing bus. When he is 6m beind the door at t=0 , the bus mover forward and continuous with a constant acceleration of 1.2m//s^(2) . The man reaches the door in time t . Then

A block of mass m1 = 1 kg another mass m2 = 2 kg, are placed together (see figure) on an inclined plane with angle of inclination theta . Various values of theta are given in List I. The coefficient of friction between the block m_(1) and the plane is always zero. The coefficient of static and dynamic friction between the block m_(2) and the plane are equal to mu = 0.3 . In List II expressions for the friction on block m_(2) are given. Match the correct expression of the friction in List II with the angles given in List I, and choose the correct option. The acceleration due to gravity is denoted by g [Useful information : tan (5.5^(@)) ~~ 0.1, tan (11.5^(@)) ~~ 0.2 , tan (16.5^(@))~~ 0.3 ].

Suppose, you are to take the measurements of the mass of a 50.0-gram standard sample with a weighing balance. You get values of 47.5, 47.6, 47.5 and 47.7 grams with weighing machine-1 and 49.8, 50.5, 51.0, 49.6 with machine-2, then (A) Machine 1 is more accurate and less precise (B) Machine 2 is more assurate and less precise (C) Machine 1 is less accurate and more precise (D) Machine 2 is less accurate and more percise Select correct alternative.

A cottage industry manufactures pedestal lamps and wooden shades, each requiring the use of a grinding/cutting machine and a sprayer. It takes 2 hours on grinding/cutting machine and 3 hours on the sprayer to manufacture a pedestal lamp. It takes 1 hour on the grinding/cutting machine and 2 hours on the sprayer to manufacture a shade. On any day, the sprayer is available for at the most 20 hours and the grinding/cutting machine for at the most 12 hours. The profit from the sale of a lamp is Rs. 5 and that from a shade is Rs. 3. Assuming that the manufacturer can sell all the lamps and shades that he produces, how should he schedule his daily production in order to maximise his profit ?

A factory manufactures two types of screws, A and B. Each type of screw requires the use of two machines, an automatic and a hand operated. It takes 4 minutes on the automatic and 6 minutes on hand operated machines to manufacture a package of screws A, while it takes 6 minutes on automatic and 3 minutes on the hand operated machines to manufacture a package of screws B. Each machine is available for at the most 4 hours on any day. The manufacturer can sell a package of screws A at a profit of Rs. 7 and screws B at a profit of Rs. 10. Assuming that he can sell all the screws he manufactures, how many packages of each type should the factory owner produce in a day in order to maximise his profit ? Determine the maximum profit.

ALLEN -NEWTON'S LAWS OF MOTION & FRICTION-EXERCISE (O-1)
  1. Two astronauts A and B connected with a rope stay stationary in free s...

    Text Solution

    |

  2. Three boxes are placed in a life. Wheen acceleration of the life is 4m...

    Text Solution

    |

  3. A man is standing on a weighing machine with a block in his hand. The ...

    Text Solution

    |

  4. A block is being pulled by a force F on a long frictionless level floo...

    Text Solution

    |

  5. A block B is tied to one end of a uniform rope R as shown. The mass of...

    Text Solution

    |

  6. The pulleys and strings shown in the fig are smooth and of negligible ...

    Text Solution

    |

  7. A block resting on a smooth inclined plane is acted upon by a force F ...

    Text Solution

    |

  8. In the arrangement shown, the blocks of unequal masses are held at res...

    Text Solution

    |

  9. A monkey weighing 10 kg climbing up a light rope and frictionless pull...

    Text Solution

    |

  10. A heavy cart is pulled by a constant force F along a horizontal track ...

    Text Solution

    |

  11. In arrangement shown the block A of mass 15 kg supported in equilibriu...

    Text Solution

    |

  12. In the given figure, Find mass of the block A, if it remains at rest, ...

    Text Solution

    |

  13. In the arrangement shown, the 2 kg block is held to keep the system at...

    Text Solution

    |

  14. A string of negligible mass going over a clamped puley of mass m suppo...

    Text Solution

    |

  15. Block A is moving away from the wall at a speed v and acceleration a.

    Text Solution

    |

  16. In the setup shown, fird acceleration of the block C.

    Text Solution

    |

  17. A block of mass 2 kg is kept on a rough horizontal floor an pulled wit...

    Text Solution

    |

  18. In the figure shown a ring of mass M and a block of mass m are in equi...

    Text Solution

    |

  19. A force barF=hati+4hatj acts on block shown. The force of friction act...

    Text Solution

    |

  20. Block B of mass 100 kg rests on a rough surface of friction coeffcient...

    Text Solution

    |