Home
Class 12
MATHS
A long playing records revolves with a s...

A long playing records revolves with a speed of `33 1/3` rev/min and has a radius of `15cm`. Two coins are placed at a distance of `4cm` and `14cm` from the centre of the record. If the coefficient of friction between the coins and the record is 0.15. Select the CORRECT statement:

A

Both coins revolves with the disc

B

None of the coins revolves with the disc

C

Coin placed at `4cm` will ship while `14cm` revolves with disc

D

Coin placed at `14cm` will ship while `4cm` revolves with disc

Text Solution

Verified by Experts

Promotional Banner

Topper's Solved these Questions

Similar Questions

Explore conceptually related problems

A disc revolves with a speed of 33 1/3 rev/min. 3 and has radius of 15 cm. Two coins are placed at 4 cm and 14 cm away from the centre of the record. If the co-efficient of friction between the coins and the record is 0.15 which of the coins will revolve with the record ?

A gramphone record is revolving with an angular velocity omega . A coin is placed at a distance r from the centre of the record. The static coefficient of friction is mu . The coin will revolve with the record if

Find the maximum speed at which a car can take turn round a curve of 30 cm radius on a level road if the coefficient of friction between the tyres and the road is 0.4. Take g = 10 ms^(-2) .

A disc is rotatin g aro u n d its cen tre in a horizontal plane at the rate of 60 rotation/ minute. A coin (1A^(st)) is placed at a distance of 18 cm and 2^(nd) similar coin 20 cm from its centre. The co-efficient of static friction between the disc and the coins is 0.2. Which coin will be thrown away from the disc ? Which coin will keep rotating with the disc ?

A point object is placed at the centre of a glass sphere of radius 6cm and refractive index 1.5. The distance of virtual image from the surface is

A short bar magnet placed in a horizontal plane has its axis aligned along the magnetic north-south direction. Null points are found on the axis of the magnet at 14 cm from the centre of the magnet. The earth's magnetic Meld at the place is 0.36 G and the angle of dip 18 zero. What is the total magnetic feld on the normal bisector of the magnet at the same distance as the mull-point (i.e., 14 cm) from the centre of the magnet? At rull points, field due to a magnet 1s equal and opposite to the horizontal component of earth's magnetic field.)

Two blocks of mass m_(1)=10kg and m_(2)=5kg connected to each other by a massless inextensible string of length 0.3m are placed along a diameter of the turntable. The coefficient of friction between the table and m_(1) is 0.5 while there is no friction between m_(2) and the table. the table is rotating with an angular velocity of 10rad//s . about a vertical axis passing through its center O . the masses are placed along the diameter of the table on either side of the center O such that the mass m_(1) is at a distance of 0.124m from O . the masses are observed to be at a rest with respect to an observed on the tuntable (g=9.8m//s^(2)) . (a) Calculate the friction on m_(1) (b) What should be the minimum angular speed of the turntable so that the masses will slip from this position? (c ) How should the masses be placed with the string remaining taut so that there is no friction on m_(1) .

An alpha is moving along a circle of radius R with a constant angular velocity omega . Point A lies in the same plane at a distance 2R from the centre. Point A records magnetic field produced by the alpha -particle. If the minimum time interval between two successive time at which A records zero magnetic field is t, the angular speed omega , in terms of t, is

A conducting sphere of radius 10 cm has an unknown charge if the electric field 20 cm from the centre of the sphere is 1.5 xx10^(3) N/C and points radialy inward what is the net charge on the sphere

ALLEN -TEST PAPERS-PHYSICS
  1. A particle moves such that its position x varies with time according t...

    Text Solution

    |

  2. For a particle moving on x-axis velocity time graph is shown in figure...

    Text Solution

    |

  3. A long playing records revolves with a speed of 33 1/3 rev/min and ha...

    Text Solution

    |

  4. A block of mass 10kg is at rest on a frictionless wedge. Angle of incl...

    Text Solution

    |

  5. Figure shows position versus time graph of two rabbits running opposit...

    Text Solution

    |

  6. Two boats A and B starts from A and B respectively and both boats reac...

    Text Solution

    |

  7. Two boats A and B starts from A and B respectively and both boats reac...

    Text Solution

    |

  8. In a small pan of heat capacity 300J//.^(@)C we pour 0.5 litre water a...

    Text Solution

    |

  9. In a small pan of heat capacity 300J//.^(@)C we pour 0.5 litre water a...

    Text Solution

    |

  10. Compound A(2)B crystallise in hexagonal lattice at low temperature. Un...

    Text Solution

    |

  11. Given: C(2)H(2)(g)+2H(2)(g)toC(2)H(6)(g) At 400K it was observed du...

    Text Solution

    |

  12. Whch of the following statement in INCORRCT about CO(3)^(2-) ion?

    Text Solution

    |

  13. Bond energy is maximum for

    Text Solution

    |

  14. Consider following structures and select INCORRECT order.

    Text Solution

    |

  15. Which of the following pairs are resonance structures of each other?

    Text Solution

    |

  16. Identify compound incorrectly match with total number of Deuterium exc...

    Text Solution

    |

  17. Which is/are correct statements about a solution containing CH(3)COCH(...

    Text Solution

    |

  18. Which is /are correct statements about face centered cubic unit cell o...

    Text Solution

    |

  19. Consider following combintion reactions. and select CORRECT optio...

    Text Solution

    |

  20. Which of the following statement is/are INCORRECT?

    Text Solution

    |