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A nucleus of uranium decays at rest into nuclei of thorium and helium. Then

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Important Questions on Force

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MHT-CET TRIUMPH Physics Multiple Choice Questions Part - 1 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 3 - Force>Competitive Thinking>Q 120

If a street light of mass $M$ is suspended from the end of a uniform rod of length $L$ in different possible patterns as shown in figure, then

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MHT-CET TRIUMPH Physics Multiple Choice Questions Part - 1 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 3 - Force>Competitive Thinking>Q 121

Two spherical bodies of mass

M

and undefined and radii

R

and

2 R

, respectively are released in free space with initial separation between their centres equal to

12 R

. If they attract each other due to gravitational force only, then the distance covered by the smaller body just before the collision is

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MHT-CET TRIUMPH Physics Multiple Choice Questions Part - 1 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 3 - Force>Competitive Thinking>Q 122

A ball (initially at rest) is released from the top of a tower. The ratio of work done by the force of gravity in the first, second and third seconds is,

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MHT-CET TRIUMPH Physics Multiple Choice Questions Part - 1 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 3 - Force>Competitive Thinking>Q 123

Hammer of mass

M

strikes a nail of mass

m

with a velocity

20 m s^{- 1}

into a fixed wall. The nail penetrates into the wall to a depth of

1 cm .

The average resistance of the wall to the penetration of the nail is,

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MHT-CET TRIUMPH Physics Multiple Choice Questions Part - 1 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 3 - Force>Competitive Thinking>Q 124

Two particles

A

and

B

(both initially at rest) start moving towards each other under a mutual force of attraction, when the speed of

A

v

and the speed of

B

2 v,

the speed of the centre of mass is,

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MHT-CET TRIUMPH Physics Multiple Choice Questions Part - 1 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 3 - Force>Competitive Thinking>Q 125

Two particles of equal masses have velocity

{\vec{v}}_{1} = 2 \hat{i} m s^{- 1}

and

{\vec{v}}_{2} = 2 \hat{j} m s^{- 1} .

The first particle has an acceleration

a_{1} = (3 \hat{i} + 3 \hat{j}) m s^{- 2}

, while the acceleration of the other particle is zero. The centre of mass of the two particles moves in a,

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MHT-CET TRIUMPH Physics Multiple Choice Questions Part - 1 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 3 - Force>Competitive Thinking>Q 126

Assertion: If there is no external torque on a body about its centre of mass, then the velocity of the centre of mass remains constant.

Reason: The linear momentum of an isolated system remains constant.

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MHT-CET TRIUMPH Physics Multiple Choice Questions Part - 1 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 3 - Force>Competitive Thinking>Q 127

Assertion: A table cloth can be pulled from a table without dislodging the dishes.

Reason: To every action, there is an equal and opposite reaction.

A nucleus of uranium decays at rest into nuclei of thorium and helium. Then

Important Questions on Force

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