Home
Class 12
PHYSICS
Assertion :- To observe the motion of pl...

Assertion `:-` To observe the motion of planets, the sun may be assumed to be an inertial frame.
Reason `:-` For practical purpose a frame of reference may be considered as inertial if it’s acceleration is negligible `w.r.t.` the acceleration of the object to be observed.

A

(a)If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion.

B

(b)If both Assertion & Reason are True but Reason is not a correct explanation of the Assertiion.

C

(c)If Assertion is True but the Reason is False.

D

(d)If both Assertion & Reason are False

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Topper's Solved these Questions

Similar Questions

Explore conceptually related problems

Einstein in 1905 proppunded the special theory of relativity and in 1915 proposed the general theory of relativity. The special theory deals with inertial frames of reference. The general theory of relativity deals with problems in which one frame of reference. He assumed that fixed frame is accelerated w.r.t. another frame of reference of reference cannot be located. Postulated of special theory of realtivity ● The laws of physics have the same form in all inertial systems. ● The velocity light in empty space is a unicersal constant the same for all observers. ● Einstein proved the following facts based on his theory of special relativity. Let v be the velocity of the speceship w.r.t a given frame of reference. The obserations are made by an observer in that reference frame. ● All clocks on the spaceship wil go slow by a factor sqrt(1-v^(2)//c^(2)) ● All objects on the spaceship will have contracted in length by a factor sqrt(1-v^(2)//c^(2)) ● The mass of the spaceship increases by a factor sqrt(1-v^(2)//c^(2)) ● Mass and energy are interconvertable E = mc^(2) The speed of a meterial object can never exceed the velocity of light. ● If two objects A and B are moving with velocity u and v w.r.t each other along the x -axis, the relative velocity of A w.r.t. B = (u-v)/(1-uv//v^(2)) One cosmic ray particle appraches the earth along its axis with a velocity of 0.9c towards the north the and another one with a velocity of 0.5c towards the south pole. The relative speed of approcach of one particle w.r.t. another is-

Einstein in 1905 proppunded the special theory of relativity and in 1915 proposed the general theory of relativity. The special theory deals with inertial frames of reference. The general theory of relativity deals with problems in which one frame of reference. He assumed that fixed frame is accelerated w.r.t. another frame of reference of reference cannot be located. Postulated of special theory of realtivity ● The laws of physics have the same form in all inertial systems. ● The velocity light in empty space is a unicersal constant the same for all observers. ● Einstein proved the following facts based on his theory of special relativity. Let v be the velocity of the speceship w.r.t a given frame of reference. The obserations are made by an observer in that reference frame. ● All clocks on the spaceship wil go slow by a factor sqrt(1-v^(2)//c^(2)) ● All objects on the spaceship will have contracted in length by a factor sqrt(1-v^(2)//c^(2)) ● The mass of the spaceship increases by a factor sqrt(1-v^(2)//c^(2)) ● Mass and energy are interconvertable E = mc^(2) The speed of a meterial object can never exceed the velocity of light. ● If two objects A and B are moving with velocity u and v w.r.t each other along the x -axis, the relative velocity of A w.r.t. B = (u-v)/(1-uv//v^(2)) A stationary body explodes into two fragments each of rest mass 1 kg that move apart at speed of 0.6c relative to the original body. The rest mass of the original body is -

Einstein in 1905 proppunded the special theory of relativity and in 1915 proposed the general theory of relativity. The special theory deals with inertial frames of reference. The general theory of relativity deals with problems in which one frame of reference. He assumed that fixed frame is accelerated w.r.t. another frame of reference of reference cannot be located. Postulated of special theory of realtivity ● The laws of physics have the same form in all inertial systems. ● The velocity light in empty space is a unicersal constant the same for all observers. ● Einstein proved the following facts based on his theory of special relativity. Let v be the velocity of the speceship w.r.t a given frame of reference. The obserations are made by an observer in that reference frame. ● All clocks on the spaceship wil go slow by a factor sqrt(1-v^(2)//c^(2)) ● All objects on the spaceship will have contracted in length by a factor sqrt(1-v^(2)//c^(2)) ● The mass of the spaceship increases by a factor sqrt(1-v^(2)//c^(2)) ● Mass and energy are interconvertable E = mc^(2) The speed of a meterial object can never exceed the velocity of light. ● If two objects A and B are moving with velocity u and v w.r.t each other along the x -axis, the relative velocity of A w.r.t. B = (u-v)/(1-uv//v^(2)) The momentum of an electron moving with a speed 0.6 c (Rest mass of electron is 9.1 xx 10^(-31 kg )

Assertion: The driver in a vechicle moving with a constant speed on a straight road is in a non-inertial frame of referance. Reason: A reference frame in which Newton's laws of motion are applicable is non-inertial.

Assertion :- The shape of trajactory depends on the acceleration and intial condition of motion. Reason :- Trajectory of an object moving under a constant acceleration may be a straight line.

The magnetic force depends on v which depends on the inertial frame of reference. Does then the magnetic force differ from inertial frame to frame ? Is it reasonable that the net acceleration has a different value in different frames of reference ?

Assertion :- A particle on earth found to be at rest when seen from a frame U_(1) and moving with a constant velocity when seen from another frame U_(2) . Then both frames may be non - inertial. Reason :- A reference frame attached to the earth must be an inertial frame.

A frame of reference that is accelerated with respect to an inertial frame of reference is called a non-inertial frame of reference. A coordinate system fixed on a circular disc rotating about a fixed axis with a constant angular velocity omega is an example of non=inertial frame of reference. The relationship between the force vecF_(rot) experienced by a particle of mass m moving on the rotating disc and the force vecF_(in) experienced by the particle in an inertial frame of reference is vecF_(rot)=vecF_(i n)+2m(vecv_(rot)xxvec omega)+m(vec omegaxx vec r)xxvec omega . where vecv_(rot) is the velocity of the particle in the rotating frame of reference and vecr is the position vector of the particle with respect to the centre of the disc. Now consider a smooth slot along a diameter fo a disc of radius R rotating counter-clockwise with a constant angular speed omega about its vertical axis through its center. We assign a coordinate system with the origin at the center of the disc, the x-axis along the slot, the y-axis perpendicular to the slot and the z-axis along the rotation axis (vecomega=omegahatk) . A small block of mass m is gently placed in the slot at vecr(R//2)hati at t=0 and is constrained to move only along the slot. The distance r of the block at time is

A frame of reference that is accelerated with respect to an inertial frame of reference is called a non-inertial frame of reference. A coordinate system fixed on a circular disc rotating about a fixed axis with a constant angular velocity omega is an example of non=inertial frame of reference. The relationship between the force vecF_(rot) experienced by a particle of mass m moving on the rotating disc and the force vecF_(in) experienced by the particle in an inertial frame of reference is vecF_(rot)=vecF_(i n)+2m(vecv_(rot)xxvec omega)+m(vec omegaxx vec r)xxvec omega . where vecv_(rot) is the velocity of the particle in the rotating frame of reference and vecr is the position vector of the particle with respect to the centre of the disc. Now consider a smooth slot along a diameter fo a disc of radius R rotating counter-clockwise with a constant angular speed omega about its vertical axis through its center. We assign a coordinate system with the origin at the center of the disc, the x-axis along the slot, the y-axis perpendicular to the slot and the z-axis along the rotation axis (vecomega=omegahatk) . A small block of mass m is gently placed in the slot at vecr(R//2)hati at t=0 and is constrained to move only along the slot. The distance r of the block at time is

Distance is a scalar quantity. Displacement is a vector quqntity. The magnitude of displacement is always less than or equal to distance. For a moving body displacement can be zero but distance cannot be zero. Same concept is applicable regarding velocity and speed. Acceleration is the rate of change of velocity. If acceleration is constant, then equations of kinematics are applicable for one dimensional motion under the gravity in which air resistance is considered, then the value of acceleration depends on the density of medium. Each motion is measured with respect of frame of reference. Relative velocity may be greater // smaller to the individual velocities. A particle moves from A to B. Then the ratio of distance to displacement is :-

ALLEN -TEST PAPER-Exercise (Physics)
  1. Assertion :- velocity time graph of two paticles undergoing head-on co...

    Text Solution

    |

  2. Statement-1 : For any collision, coefficient of restitution (e0 lies ...

    Text Solution

    |

  3. Assertion :- To observe the motion of planets, the sun may be assumed ...

    Text Solution

    |

  4. Assertion :- The mechanical energy of earth-moon system remains same w...

    Text Solution

    |

  5. The average velocity of a particle moving on a straight line is zero i...

    Text Solution

    |

  6. Assertion:- A body may gain kinetic energy and potential energy simult...

    Text Solution

    |

  7. Assertion :- Newton's first law defines inertial frame of reference. ...

    Text Solution

    |

  8. A man of mass 80kg pushes box of mass 20kg horizontaly. The man moves ...

    Text Solution

    |

  9. Assertion :- A particle has positive acceleration it means that its sp...

    Text Solution

    |

  10. Assertion :- The shape of trajactory depends on the acceleration and i...

    Text Solution

    |

  11. Assertion :- In projectile motion a particle is projected at some angl...

    Text Solution

    |

  12. Assertion :- A block is hanged from spring. Spring force on block grav...

    Text Solution

    |

  13. Assertion :- Tension in massless string may be different at different ...

    Text Solution

    |

  14. Assertion :- Work done by frictional force may be sometimes path indep...

    Text Solution

    |

  15. Assertion :- Work done is positive when force acts in the direction of...

    Text Solution

    |

  16. STATEMENT-1: It is easier to pull a heavy object than to push it on a ...

    Text Solution

    |

  17. Assertion :- When a man climbs the rope friction force acts in downwar...

    Text Solution

    |

  18. Assertion :- According work energy theorem net work done on a body is ...

    Text Solution

    |

  19. Assertion :- Mass and energy are not conserved separately,but are cons...

    Text Solution

    |

  20. Assertion :- When a spring is elongated work done by spring is negativ...

    Text Solution

    |