Question Description
Paragraph for Questions 9 and 10The general motion of a rigid body can be considered to be a combination of (i) a motion of its centre ofmass 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 rotatedabout the origin on a horizontal frictionless plane with angular speed ω, the motion at any instant can betaken as a combination of (i) a rotation of the centre of mass of the disc about the z-axis, and (ii) a rotationof the disc through an instantaneous vertical axis passing through its centre of mass (as is seen from thechanged orientation of points P and Q). Both these motions have the same angular speed ω in this caseNow consider two similar systems as shown in the figure: Case(a) the disc with its face vertical andparallel to x-z plane; Case (b) the disc with its face making an angle of 45° with x-y plane and itshorizontal diameter parallel to x-axis. In both the cases, the disc is welded at point P, and the systems arerotated with constant angular speed ω about the z-axis.Q.Which of the following statements regarding the angular speed about the instantaneous axis(passing through the centre of mass) is correct?a)b)c)d)It is ω for both the cases.Correct answer is option 'D'. 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 Paragraph for Questions 9 and 10The general motion of a rigid body can be considered to be a combination of (i) a motion of its centre ofmass 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 rotatedabout the origin on a horizontal frictionless plane with angular speed ω, the motion at any instant can betaken as a combination of (i) a rotation of the centre of mass of the disc about the z-axis, and (ii) a rotationof the disc through an instantaneous vertical axis passing through its centre of mass (as is seen from thechanged orientation of points P and Q). Both these motions have the same angular speed ω in this caseNow consider two similar systems as shown in the figure: Case(a) the disc with its face vertical andparallel to x-z plane; Case (b) the disc with its face making an angle of 45° with x-y plane and itshorizontal diameter parallel to x-axis. In both the cases, the disc is welded at point P, and the systems arerotated with constant angular speed ω about the z-axis.Q.Which of the following statements regarding the angular speed about the instantaneous axis(passing through the centre of mass) is correct?a)b)c)d)It is ω for both the cases.Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for JEE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Paragraph for Questions 9 and 10The general motion of a rigid body can be considered to be a combination of (i) a motion of its centre ofmass 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 rotatedabout the origin on a horizontal frictionless plane with angular speed ω, the motion at any instant can betaken as a combination of (i) a rotation of the centre of mass of the disc about the z-axis, and (ii) a rotationof the disc through an instantaneous vertical axis passing through its centre of mass (as is seen from thechanged orientation of points P and Q). Both these motions have the same angular speed ω in this caseNow consider two similar systems as shown in the figure: Case(a) the disc with its face vertical andparallel to x-z plane; Case (b) the disc with its face making an angle of 45° with x-y plane and itshorizontal diameter parallel to x-axis. In both the cases, the disc is welded at point P, and the systems arerotated with constant angular speed ω about the z-axis.Q.Which of the following statements regarding the angular speed about the instantaneous axis(passing through the centre of mass) is correct?a)b)c)d)It is ω for both the cases.Correct answer is option 'D'. Can you explain this answer?.

Solutions for Paragraph for Questions 9 and 10The general motion of a rigid body can be considered to be a combination of (i) a motion of its centre ofmass 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 rotatedabout the origin on a horizontal frictionless plane with angular speed ω, the motion at any instant can betaken as a combination of (i) a rotation of the centre of mass of the disc about the z-axis, and (ii) a rotationof the disc through an instantaneous vertical axis passing through its centre of mass (as is seen from thechanged orientation of points P and Q). Both these motions have the same angular speed ω in this caseNow consider two similar systems as shown in the figure: Case(a) the disc with its face vertical andparallel to x-z plane; Case (b) the disc with its face making an angle of 45° with x-y plane and itshorizontal diameter parallel to x-axis. In both the cases, the disc is welded at point P, and the systems arerotated with constant angular speed ω about the z-axis.Q.Which of the following statements regarding the angular speed about the instantaneous axis(passing through the centre of mass) is correct?a)b)c)d)It is ω for both the cases.Correct answer is option 'D'. 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 Paragraph for Questions 9 and 10The general motion of a rigid body can be considered to be a combination of (i) a motion of its centre ofmass 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 rotatedabout the origin on a horizontal frictionless plane with angular speed ω, the motion at any instant can betaken as a combination of (i) a rotation of the centre of mass of the disc about the z-axis, and (ii) a rotationof the disc through an instantaneous vertical axis passing through its centre of mass (as is seen from thechanged orientation of points P and Q). Both these motions have the same angular speed ω in this caseNow consider two similar systems as shown in the figure: Case(a) the disc with its face vertical andparallel to x-z plane; Case (b) the disc with its face making an angle of 45° with x-y plane and itshorizontal diameter parallel to x-axis. In both the cases, the disc is welded at point P, and the systems arerotated with constant angular speed ω about the z-axis.Q.Which of the following statements regarding the angular speed about the instantaneous axis(passing through the centre of mass) is correct?a)b)c)d)It is ω for both the cases.Correct answer is option 'D'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of Paragraph for Questions 9 and 10The general motion of a rigid body can be considered to be a combination of (i) a motion of its centre ofmass 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 rotatedabout the origin on a horizontal frictionless plane with angular speed ω, the motion at any instant can betaken as a combination of (i) a rotation of the centre of mass of the disc about the z-axis, and (ii) a rotationof the disc through an instantaneous vertical axis passing through its centre of mass (as is seen from thechanged orientation of points P and Q). Both these motions have the same angular speed ω in this caseNow consider two similar systems as shown in the figure: Case(a) the disc with its face vertical andparallel to x-z plane; Case (b) the disc with its face making an angle of 45° with x-y plane and itshorizontal diameter parallel to x-axis. In both the cases, the disc is welded at point P, and the systems arerotated with constant angular speed ω about the z-axis.Q.Which of the following statements regarding the angular speed about the instantaneous axis(passing through the centre of mass) is correct?a)b)c)d)It is ω for both the cases.Correct answer is option 'D'. Can you explain this answer?, a detailed solution for Paragraph for Questions 9 and 10The general motion of a rigid body can be considered to be a combination of (i) a motion of its centre ofmass 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 rotatedabout the origin on a horizontal frictionless plane with angular speed ω, the motion at any instant can betaken as a combination of (i) a rotation of the centre of mass of the disc about the z-axis, and (ii) a rotationof the disc through an instantaneous vertical axis passing through its centre of mass (as is seen from thechanged orientation of points P and Q). Both these motions have the same angular speed ω in this caseNow consider two similar systems as shown in the figure: Case(a) the disc with its face vertical andparallel to x-z plane; Case (b) the disc with its face making an angle of 45° with x-y plane and itshorizontal diameter parallel to x-axis. In both the cases, the disc is welded at point P, and the systems arerotated with constant angular speed ω about the z-axis.Q.Which of the following statements regarding the angular speed about the instantaneous axis(passing through the centre of mass) is correct?a)b)c)d)It is ω for both the cases.Correct answer is option 'D'. Can you explain this answer? has been provided alongside types of Paragraph for Questions 9 and 10The general motion of a rigid body can be considered to be a combination of (i) a motion of its centre ofmass 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 rotatedabout the origin on a horizontal frictionless plane with angular speed ω, the motion at any instant can betaken as a combination of (i) a rotation of the centre of mass of the disc about the z-axis, and (ii) a rotationof the disc through an instantaneous vertical axis passing through its centre of mass (as is seen from thechanged orientation of points P and Q). Both these motions have the same angular speed ω in this caseNow consider two similar systems as shown in the figure: Case(a) the disc with its face vertical andparallel to x-z plane; Case (b) the disc with its face making an angle of 45° with x-y plane and itshorizontal diameter parallel to x-axis. In both the cases, the disc is welded at point P, and the systems arerotated with constant angular speed ω about the z-axis.Q.Which of the following statements regarding the angular speed about the instantaneous axis(passing through the centre of mass) is correct?a)b)c)d)It is ω for both the cases.Correct answer is option 'D'. Can you explain this answer? theory, EduRev gives you an ample number of questions to practice Paragraph for Questions 9 and 10The general motion of a rigid body can be considered to be a combination of (i) a motion of its centre ofmass 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 rotatedabout the origin on a horizontal frictionless plane with angular speed ω, the motion at any instant can betaken as a combination of (i) a rotation of the centre of mass of the disc about the z-axis, and (ii) a rotationof the disc through an instantaneous vertical axis passing through its centre of mass (as is seen from thechanged orientation of points P and Q). Both these motions have the same angular speed ω in this caseNow consider two similar systems as shown in the figure: Case(a) the disc with its face vertical andparallel to x-z plane; Case (b) the disc with its face making an angle of 45° with x-y plane and itshorizontal diameter parallel to x-axis. In both the cases, the disc is welded at point P, and the systems arerotated with constant angular speed ω about the z-axis.Q.Which of the following statements regarding the angular speed about the instantaneous axis(passing through the centre of mass) is correct?a)b)c)d)It is ω for both the cases.Correct answer is option 'D'. Can you explain this answer? tests, examples and also practice JEE tests.