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The general motion of a rigid body can be considered to be a combination of (i) a motion of its centre of mass about an axis, and (ii) its motion about an instantaneous axis passing through the centre of mass.These axes need not be stationary. Consider, for example, a thin uniform disc welded (rigidly fixed) horizontally at its rim to a massless, stick, as shown in the figure. When the disc-stick system is rotated about the origin on a horizontal frictionless plane with angular speedω, the motion at any instant can be taken as a combination of (i) a rotation of the centre of mass of the disc about the z-axis and (ii) a rotation of the disc through an instantaneous vertical axis passing through its centre of mass (as is seen from the changed orientation of points P and Q). Both these motions have the same angular speed w in this case Now consider two similar systems as shown in the figure: Case (a) the disc with its face vertical and parallel to x-z plane; Case (b) the disc with its face making an angle of 45° with x-y plane and its horizontal diameter parallel to x-axis. In both the cases, the disc is welded at point P, and the systems are rotated with constant angular speed ω about the z-axis.Q.7.Which of the following statements about the instantaneous axis (passing through the centre of mass) is correct?a)It is vertical for both the cases (a) and (b)b)It is vertical for case (a); and is at 45° to the x-z plane and lies in the plane of the disc for case (b).c)It is horizontal for case (a); and is at 45° to the x-z plane and is normal to the plane of the disc for case (b).d)It is vertical for case (a); and is 45° to the x-z plane and is normal to the plane of the disc for case (b).Correct answer is option 'A'. Can you explain this answer? for JEE 2024 is part of JEE preparation. The Question and answers have been prepared according to the JEE exam syllabus. Information about The general motion of a rigid body can be considered to be a combination of (i) a motion of its centre of mass about an axis, and (ii) its motion about an instantaneous axis passing through the centre of mass.These axes need not be stationary. Consider, for example, a thin uniform disc welded (rigidly fixed) horizontally at its rim to a massless, stick, as shown in the figure. When the disc-stick system is rotated about the origin on a horizontal frictionless plane with angular speedω, the motion at any instant can be taken as a combination of (i) a rotation of the centre of mass of the disc about the z-axis and (ii) a rotation of the disc through an instantaneous vertical axis passing through its centre of mass (as is seen from the changed orientation of points P and Q). Both these motions have the same angular speed w in this case Now consider two similar systems as shown in the figure: Case (a) the disc with its face vertical and parallel to x-z plane; Case (b) the disc with its face making an angle of 45° with x-y plane and its horizontal diameter parallel to x-axis. In both the cases, the disc is welded at point P, and the systems are rotated with constant angular speed ω about the z-axis.Q.7.Which of the following statements about the instantaneous axis (passing through the centre of mass) is correct?a)It is vertical for both the cases (a) and (b)b)It is vertical for case (a); and is at 45° to the x-z plane and lies in the plane of the disc for case (b).c)It is horizontal for case (a); and is at 45° to the x-z plane and is normal to the plane of the disc for case (b).d)It is vertical for case (a); and is 45° to the x-z plane and is normal to the plane of the disc for case (b).Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for JEE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The general motion of a rigid body can be considered to be a combination of (i) a motion of its centre of mass about an axis, and (ii) its motion about an instantaneous axis passing through the centre of mass.These axes need not be stationary. Consider, for example, a thin uniform disc welded (rigidly fixed) horizontally at its rim to a massless, stick, as shown in the figure. When the disc-stick system is rotated about the origin on a horizontal frictionless plane with angular speedω, the motion at any instant can be taken as a combination of (i) a rotation of the centre of mass of the disc about the z-axis and (ii) a rotation of the disc through an instantaneous vertical axis passing through its centre of mass (as is seen from the changed orientation of points P and Q). Both these motions have the same angular speed w in this case Now consider two similar systems as shown in the figure: Case (a) the disc with its face vertical and parallel to x-z plane; Case (b) the disc with its face making an angle of 45° with x-y plane and its horizontal diameter parallel to x-axis. In both the cases, the disc is welded at point P, and the systems are rotated with constant angular speed ω about the z-axis.Q.7.Which of the following statements about the instantaneous axis (passing through the centre of mass) is correct?a)It is vertical for both the cases (a) and (b)b)It is vertical for case (a); and is at 45° to the x-z plane and lies in the plane of the disc for case (b).c)It is horizontal for case (a); and is at 45° to the x-z plane and is normal to the plane of the disc for case (b).d)It is vertical for case (a); and is 45° to the x-z plane and is normal to the plane of the disc for case (b).Correct answer is option 'A'. Can you explain this answer?.

Solutions for The general motion of a rigid body can be considered to be a combination of (i) a motion of its centre of mass about an axis, and (ii) its motion about an instantaneous axis passing through the centre of mass.These axes need not be stationary. Consider, for example, a thin uniform disc welded (rigidly fixed) horizontally at its rim to a massless, stick, as shown in the figure. When the disc-stick system is rotated about the origin on a horizontal frictionless plane with angular speedω, the motion at any instant can be taken as a combination of (i) a rotation of the centre of mass of the disc about the z-axis and (ii) a rotation of the disc through an instantaneous vertical axis passing through its centre of mass (as is seen from the changed orientation of points P and Q). Both these motions have the same angular speed w in this case Now consider two similar systems as shown in the figure: Case (a) the disc with its face vertical and parallel to x-z plane; Case (b) the disc with its face making an angle of 45° with x-y plane and its horizontal diameter parallel to x-axis. In both the cases, the disc is welded at point P, and the systems are rotated with constant angular speed ω about the z-axis.Q.7.Which of the following statements about the instantaneous axis (passing through the centre of mass) is correct?a)It is vertical for both the cases (a) and (b)b)It is vertical for case (a); and is at 45° to the x-z plane and lies in the plane of the disc for case (b).c)It is horizontal for case (a); and is at 45° to the x-z plane and is normal to the plane of the disc for case (b).d)It is vertical for case (a); and is 45° to the x-z plane and is normal to the plane of the disc for case (b).Correct answer is option 'A'. Can you explain this answer? in English & in Hindi are available as part of our courses for JEE. Download more important topics, notes, lectures and mock test series for JEE Exam by signing up for free.

Here you can find the meaning of The general motion of a rigid body can be considered to be a combination of (i) a motion of its centre of mass about an axis, and (ii) its motion about an instantaneous axis passing through the centre of mass.These axes need not be stationary. Consider, for example, a thin uniform disc welded (rigidly fixed) horizontally at its rim to a massless, stick, as shown in the figure. When the disc-stick system is rotated about the origin on a horizontal frictionless plane with angular speedω, the motion at any instant can be taken as a combination of (i) a rotation of the centre of mass of the disc about the z-axis and (ii) a rotation of the disc through an instantaneous vertical axis passing through its centre of mass (as is seen from the changed orientation of points P and Q). Both these motions have the same angular speed w in this case Now consider two similar systems as shown in the figure: Case (a) the disc with its face vertical and parallel to x-z plane; Case (b) the disc with its face making an angle of 45° with x-y plane and its horizontal diameter parallel to x-axis. In both the cases, the disc is welded at point P, and the systems are rotated with constant angular speed ω about the z-axis.Q.7.Which of the following statements about the instantaneous axis (passing through the centre of mass) is correct?a)It is vertical for both the cases (a) and (b)b)It is vertical for case (a); and is at 45° to the x-z plane and lies in the plane of the disc for case (b).c)It is horizontal for case (a); and is at 45° to the x-z plane and is normal to the plane of the disc for case (b).d)It is vertical for case (a); and is 45° to the x-z plane and is normal to the plane of the disc for case (b).Correct answer is option 'A'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of The general motion of a rigid body can be considered to be a combination of (i) a motion of its centre of mass about an axis, and (ii) its motion about an instantaneous axis passing through the centre of mass.These axes need not be stationary. Consider, for example, a thin uniform disc welded (rigidly fixed) horizontally at its rim to a massless, stick, as shown in the figure. When the disc-stick system is rotated about the origin on a horizontal frictionless plane with angular speedω, the motion at any instant can be taken as a combination of (i) a rotation of the centre of mass of the disc about the z-axis and (ii) a rotation of the disc through an instantaneous vertical axis passing through its centre of mass (as is seen from the changed orientation of points P and Q). Both these motions have the same angular speed w in this case Now consider two similar systems as shown in the figure: Case (a) the disc with its face vertical and parallel to x-z plane; Case (b) the disc with its face making an angle of 45° with x-y plane and its horizontal diameter parallel to x-axis. In both the cases, the disc is welded at point P, and the systems are rotated with constant angular speed ω about the z-axis.Q.7.Which of the following statements about the instantaneous axis (passing through the centre of mass) is correct?a)It is vertical for both the cases (a) and (b)b)It is vertical for case (a); and is at 45° to the x-z plane and lies in the plane of the disc for case (b).c)It is horizontal for case (a); and is at 45° to the x-z plane and is normal to the plane of the disc for case (b).d)It is vertical for case (a); and is 45° to the x-z plane and is normal to the plane of the disc for case (b).Correct answer is option 'A'. Can you explain this answer?, a detailed solution for The general motion of a rigid body can be considered to be a combination of (i) a motion of its centre of mass about an axis, and (ii) its motion about an instantaneous axis passing through the centre of mass.These axes need not be stationary. Consider, for example, a thin uniform disc welded (rigidly fixed) horizontally at its rim to a massless, stick, as shown in the figure. When the disc-stick system is rotated about the origin on a horizontal frictionless plane with angular speedω, the motion at any instant can be taken as a combination of (i) a rotation of the centre of mass of the disc about the z-axis and (ii) a rotation of the disc through an instantaneous vertical axis passing through its centre of mass (as is seen from the changed orientation of points P and Q). Both these motions have the same angular speed w in this case Now consider two similar systems as shown in the figure: Case (a) the disc with its face vertical and parallel to x-z plane; Case (b) the disc with its face making an angle of 45° with x-y plane and its horizontal diameter parallel to x-axis. In both the cases, the disc is welded at point P, and the systems are rotated with constant angular speed ω about the z-axis.Q.7.Which of the following statements about the instantaneous axis (passing through the centre of mass) is correct?a)It is vertical for both the cases (a) and (b)b)It is vertical for case (a); and is at 45° to the x-z plane and lies in the plane of the disc for case (b).c)It is horizontal for case (a); and is at 45° to the x-z plane and is normal to the plane of the disc for case (b).d)It is vertical for case (a); and is 45° to the x-z plane and is normal to the plane of the disc for case (b).Correct answer is option 'A'. Can you explain this answer? has been provided alongside types of The general motion of a rigid body can be considered to be a combination of (i) a motion of its centre of mass about an axis, and (ii) its motion about an instantaneous axis passing through the centre of mass.These axes need not be stationary. Consider, for example, a thin uniform disc welded (rigidly fixed) horizontally at its rim to a massless, stick, as shown in the figure. When the disc-stick system is rotated about the origin on a horizontal frictionless plane with angular speedω, the motion at any instant can be taken as a combination of (i) a rotation of the centre of mass of the disc about the z-axis and (ii) a rotation of the disc through an instantaneous vertical axis passing through its centre of mass (as is seen from the changed orientation of points P and Q). Both these motions have the same angular speed w in this case Now consider two similar systems as shown in the figure: Case (a) the disc with its face vertical and parallel to x-z plane; Case (b) the disc with its face making an angle of 45° with x-y plane and its horizontal diameter parallel to x-axis. In both the cases, the disc is welded at point P, and the systems are rotated with constant angular speed ω about the z-axis.Q.7.Which of the following statements about the instantaneous axis (passing through the centre of mass) is correct?a)It is vertical for both the cases (a) and (b)b)It is vertical for case (a); and is at 45° to the x-z plane and lies in the plane of the disc for case (b).c)It is horizontal for case (a); and is at 45° to the x-z plane and is normal to the plane of the disc for case (b).d)It is vertical for case (a); and is 45° to the x-z plane and is normal to the plane of the disc for case (b).Correct answer is option 'A'. Can you explain this answer? theory, EduRev gives you an ample number of questions to practice The general motion of a rigid body can be considered to be a combination of (i) a motion of its centre of mass about an axis, and (ii) its motion about an instantaneous axis passing through the centre of mass.These axes need not be stationary. Consider, for example, a thin uniform disc welded (rigidly fixed) horizontally at its rim to a massless, stick, as shown in the figure. When the disc-stick system is rotated about the origin on a horizontal frictionless plane with angular speedω, the motion at any instant can be taken as a combination of (i) a rotation of the centre of mass of the disc about the z-axis and (ii) a rotation of the disc through an instantaneous vertical axis passing through its centre of mass (as is seen from the changed orientation of points P and Q). Both these motions have the same angular speed w in this case Now consider two similar systems as shown in the figure: Case (a) the disc with its face vertical and parallel to x-z plane; Case (b) the disc with its face making an angle of 45° with x-y plane and its horizontal diameter parallel to x-axis. In both the cases, the disc is welded at point P, and the systems are rotated with constant angular speed ω about the z-axis.Q.7.Which of the following statements about the instantaneous axis (passing through the centre of mass) is correct?a)It is vertical for both the cases (a) and (b)b)It is vertical for case (a); and is at 45° to the x-z plane and lies in the plane of the disc for case (b).c)It is horizontal for case (a); and is at 45° to the x-z plane and is normal to the plane of the disc for case (b).d)It is vertical for case (a); and is 45° to the x-z plane and is normal to the plane of the disc for case (b).Correct answer is option 'A'. 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