Centre of Mass
PHXI07:SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

365796 A massless spring of force constant 1000Nm1 is compressed a distance of 20 cm between discs of 8 kg and 2 kg , spring is not attached to discs. The system is given an initial velocity 3 ms1 perpendicular to length of spring as shown in the figure. What is ground frame velocity of 2 kg block when spring regains its natural length.
supporting img

1 1m/s1
2 8m/s1
3 6m/s1
4 5m/s1
PHXI07:SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

365797 A block of mass m slides with velocity v along a frictionless level surface towards a block of mass 4m initially at rest. The velocity of centre of mass is

1 v/5
2 v/4
3 5v/2
4 (4/5)v
PHXI07:SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

365798 Two objects of masses 300g and 700g posseses velocities 15i^m/s and 4i^+6j^m/s respectively. The velocity of their centre of mass in m/s is

1 7i^+8j^
2 7.3i^+4.2j^
3 5i^+4j^
4 2i^+6j^
PHXI07:SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

365799 Two particles which are initially at rest, move towards each other under the action of their internal attraction. If their speeds are v1 and v2 at any instant, then the speed of centre of mass of the system will be:

1 v1+v2
2 v1v2
3 Zero
4 v1+v22
PHXI07:SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

365800 Assertion :
The centre mass of an electron and proton, when released remains at rest.
Reason :
Proton is heavier than electron.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
PHXI07:SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

365796 A massless spring of force constant 1000Nm1 is compressed a distance of 20 cm between discs of 8 kg and 2 kg , spring is not attached to discs. The system is given an initial velocity 3 ms1 perpendicular to length of spring as shown in the figure. What is ground frame velocity of 2 kg block when spring regains its natural length.
supporting img

1 1m/s1
2 8m/s1
3 6m/s1
4 5m/s1
PHXI07:SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

365797 A block of mass m slides with velocity v along a frictionless level surface towards a block of mass 4m initially at rest. The velocity of centre of mass is

1 v/5
2 v/4
3 5v/2
4 (4/5)v
PHXI07:SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

365798 Two objects of masses 300g and 700g posseses velocities 15i^m/s and 4i^+6j^m/s respectively. The velocity of their centre of mass in m/s is

1 7i^+8j^
2 7.3i^+4.2j^
3 5i^+4j^
4 2i^+6j^
PHXI07:SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

365799 Two particles which are initially at rest, move towards each other under the action of their internal attraction. If their speeds are v1 and v2 at any instant, then the speed of centre of mass of the system will be:

1 v1+v2
2 v1v2
3 Zero
4 v1+v22
PHXI07:SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

365800 Assertion :
The centre mass of an electron and proton, when released remains at rest.
Reason :
Proton is heavier than electron.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
PHXI07:SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

365796 A massless spring of force constant 1000Nm1 is compressed a distance of 20 cm between discs of 8 kg and 2 kg , spring is not attached to discs. The system is given an initial velocity 3 ms1 perpendicular to length of spring as shown in the figure. What is ground frame velocity of 2 kg block when spring regains its natural length.
supporting img

1 1m/s1
2 8m/s1
3 6m/s1
4 5m/s1
PHXI07:SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

365797 A block of mass m slides with velocity v along a frictionless level surface towards a block of mass 4m initially at rest. The velocity of centre of mass is

1 v/5
2 v/4
3 5v/2
4 (4/5)v
PHXI07:SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

365798 Two objects of masses 300g and 700g posseses velocities 15i^m/s and 4i^+6j^m/s respectively. The velocity of their centre of mass in m/s is

1 7i^+8j^
2 7.3i^+4.2j^
3 5i^+4j^
4 2i^+6j^
PHXI07:SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

365799 Two particles which are initially at rest, move towards each other under the action of their internal attraction. If their speeds are v1 and v2 at any instant, then the speed of centre of mass of the system will be:

1 v1+v2
2 v1v2
3 Zero
4 v1+v22
PHXI07:SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

365800 Assertion :
The centre mass of an electron and proton, when released remains at rest.
Reason :
Proton is heavier than electron.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
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PHXI07:SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

365796 A massless spring of force constant 1000Nm1 is compressed a distance of 20 cm between discs of 8 kg and 2 kg , spring is not attached to discs. The system is given an initial velocity 3 ms1 perpendicular to length of spring as shown in the figure. What is ground frame velocity of 2 kg block when spring regains its natural length.
supporting img

1 1m/s1
2 8m/s1
3 6m/s1
4 5m/s1
PHXI07:SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

365797 A block of mass m slides with velocity v along a frictionless level surface towards a block of mass 4m initially at rest. The velocity of centre of mass is

1 v/5
2 v/4
3 5v/2
4 (4/5)v
PHXI07:SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

365798 Two objects of masses 300g and 700g posseses velocities 15i^m/s and 4i^+6j^m/s respectively. The velocity of their centre of mass in m/s is

1 7i^+8j^
2 7.3i^+4.2j^
3 5i^+4j^
4 2i^+6j^
PHXI07:SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

365799 Two particles which are initially at rest, move towards each other under the action of their internal attraction. If their speeds are v1 and v2 at any instant, then the speed of centre of mass of the system will be:

1 v1+v2
2 v1v2
3 Zero
4 v1+v22
PHXI07:SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

365800 Assertion :
The centre mass of an electron and proton, when released remains at rest.
Reason :
Proton is heavier than electron.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
PHXI07:SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

365796 A massless spring of force constant 1000Nm1 is compressed a distance of 20 cm between discs of 8 kg and 2 kg , spring is not attached to discs. The system is given an initial velocity 3 ms1 perpendicular to length of spring as shown in the figure. What is ground frame velocity of 2 kg block when spring regains its natural length.
supporting img

1 1m/s1
2 8m/s1
3 6m/s1
4 5m/s1
PHXI07:SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

365797 A block of mass m slides with velocity v along a frictionless level surface towards a block of mass 4m initially at rest. The velocity of centre of mass is

1 v/5
2 v/4
3 5v/2
4 (4/5)v
PHXI07:SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

365798 Two objects of masses 300g and 700g posseses velocities 15i^m/s and 4i^+6j^m/s respectively. The velocity of their centre of mass in m/s is

1 7i^+8j^
2 7.3i^+4.2j^
3 5i^+4j^
4 2i^+6j^
PHXI07:SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

365799 Two particles which are initially at rest, move towards each other under the action of their internal attraction. If their speeds are v1 and v2 at any instant, then the speed of centre of mass of the system will be:

1 v1+v2
2 v1v2
3 Zero
4 v1+v22
PHXI07:SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

365800 Assertion :
The centre mass of an electron and proton, when released remains at rest.
Reason :
Proton is heavier than electron.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.