A particle of mass 10 kg is moving with velocity of $10\sqrt{x}$ m/s, where x is displacement . The work done by net force during the displacement of particle form x = 4 to x = 9 m is

1. 1250 J

2. 1000 J

3. 3500 J

4. 2500 J

Concept Questions :-

Concept of work

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The driver of a car travelling at velocity *v* suddenly see a broad wall in front of him at a distance *d*. He should

(1) Brake sharply

(2) Turn sharply

(3) (1) and (2) both

(4) None of the above

Concept Questions :-

Concept of work

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Work done by a frictional force is

(1) Negative

(2) Positive

(3) Zero

(4) All of the above

Concept Questions :-

Concept of work

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A block of mass 50* kg* slides over a horizontal distance of 1 *m*. If the coefficient of friction between their surfaces is 0.2, then work done against friction is

(1) 98* J*

(2) 72*J *

(3) 56* J*

(4) 34 *J *

AIIMS - 2000

Concept Questions :-

Concept of work

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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) $\frac{\pi {r}^{2}}{m{v}^{2}}$

Concept Questions :-

Concept of work

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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

PMT - 1992

Concept Questions :-

Concept of work

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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°

PMT - 1999

Concept Questions :-

Concept of work

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The 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° with the horizontal is (given: sin15°=0.2588):

(1) 4.36 *kJ*

(2) 5.17 *kJ*

(3) 8.91 *kJ*

(4) 9.82 *kJ*

PMT - 2003

Concept Questions :-

Concept of work

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A force $\overrightarrow{F}=5\hat{i}+6\hat{j}-4\hat{k}$ acting on a body, produces a displacement $\overrightarrow{s}=6\overrightarrow{i}+5\overrightarrow{k}.$ Work done by the force is

(1) 18 units

(2) 15 units

(3) 12 units

(4) 10 units

Concept Questions :-

Concept of work

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A force of $(3\text{\hspace{0.17em}}\hat{i}+4\text{\hspace{0.17em}}\hat{j})$ *Newton* acts on a body and displaces it by $(3\text{\hspace{0.17em}}\hat{i}+4\text{}\hat{j})\text{\hspace{0.17em}}m.$ The work done by the force is** **

(1) 10 *J*

(2) 12 *J*

(3) 16 *J*

(4) 25 *J*

AIIMS - 2001

Concept Questions :-

Concept of work

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Difficulty Level: