# A body of mass m is moving in a circle of radius r with a constant speed v. The force on the body is $\frac{m{v}^{2}}{r}$ and is directed towards the centre. What is the work done by this force in moving the body over half the circumference of the circle (1) $\frac{m{v}^{2}}{\pi {r}^{2}}$ (2) Zero (3) $\frac{m{v}^{2}}{{r}^{2}}$ (4) $\frac{\pi {r}^{2}}{m{v}^{2}}$

Subtopic:  Concept of Work |
84%
From NCERT
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A man pushes a wall and fails to displace it. He does:
1. negative work
2. positive but not maximum work
3. no work at all
4. maximum work

Subtopic:  Concept of Work |
87%
From NCERT
PMT - 1992
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A body moves a distance of 10 m along a straight line under the action of a force of 5 N. If the work done is 25 joules, the angle which the force makes with the direction of motion of the body is

(1) 0°

(2) 30°

(3) 60°

(4) 90°

Subtopic:  Concept of Work |
87%
From NCERT
PMT - 1999
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A force acts on a 30 gm particle in such a way that the position of the particle as a function of time is given by $x=3t-4{t}^{2}+{t}^{3}$, where x is in metres and t is in seconds. The work done during the first 4 seconds is

(1) 5.28 J

(2) 450 mJ

(3) 490 mJ

(4) 530 mJ

Subtopic:  Work Done by Variable Force |
61%
From NCERT
PMT - 1998
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The minimum work done in pulling up a block of wood weighing $$2$$ kN for a length of $$10$$ m on a smooth plane inclined at an angle of $$15^\circ$$ with the horizontal is (given: $$\mathrm{sin}15^\circ=0.2588)$$:
1. $$4.36$$ kJ
2. $$5.17$$ kJ
3. $$8.91$$ kJ
4. $$9.82$$ kJ

Subtopic:  Work done by constant force |
79%
From NCERT
PMT - 2003
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A body of mass 6kg is under a force which causes displacement in it given by $S=\frac{{t}^{2}}{4}$ metres where t is time. The work done by the force in 2 seconds is-

(1) 12 J

(2) 9 J

(3) 6 J

(4) 3 J

Subtopic:  Work Done by Variable Force |
72%
From NCERT
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A particle moves from position ${\stackrel{\to }{r}}_{1}=\text{\hspace{0.17em}}3\stackrel{^}{i}+2\stackrel{^}{j}-6\stackrel{^}{k}$ to position ${\stackrel{\to }{r}}_{2}=14\stackrel{^}{i}+13\stackrel{^}{j}+9\stackrel{^}{k}$ under the action of force $4\stackrel{^}{i}+\stackrel{^}{j}+3\stackrel{^}{k}\text{\hspace{0.17em}}N.$ The work done will be

(1) 100 J

(2) 50 J

(3) 200 J

(4) 75 J

Subtopic:  Concept of Work | Work Done by Variable Force | Power |
82%
From NCERT
PMT - 2002
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A uniform chain of length 2m is kept on a table such that a length of 60cm hangs freely from the edge of the table. The total mass of the chain is 4kg. What is the work done in pulling the entire chain on the table?

(1) 7.2 J

(2) 3.6 J

(3) 120 J

(4) 1200 J

Subtopic:  Gravitational Potential Energy |
67%
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A particle is acted upon by a force of constant magnitude which is always perpendicular to the velocity of the particle, the motion of the particle takes place in a plane. It follows that

(1) Its velocity is constant

(2) Its acceleration is constant

(3) Its kinetic energy is constant

(4) It moves in a straight line

Subtopic:  Work done by constant force |
57%
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Two bodies of masses 1 kg and 5 kg are dropped gently from the top of a tower. At a point 20 cm from the ground, both the bodies will have the same

(1) Momentum

(2) Kinetic energy

(3) Velocity

(4) Total energy

Subtopic:  Concept of Work |
61%
From NCERT
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