Which of the following graph depicts spring constant k versus length l of the spring correctly

(1)
(2)
(3)
(4)

Subtopic:  Elastic Potential Energy |
 68%
From NCERT
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Work done by a frictional force is

(1) Negative

(2) Positive

(3) Zero

(4) All of the above

Subtopic:  Concept of Work |
 61%
From NCERT
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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) 72J

(3) 56 J

(4) 34 J

Subtopic:  Concept of Work |
 84%
From NCERT
AIIMS - 2000
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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 mv2r 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) mv2πr2

(2) Zero

(3) mv2r2

(4) πr2mv2

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 |
 88%
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=3t4t2+t3, 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=t24 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 r1=3i^+2j^6k^ to position r2=14i^+13j^+9k^ under the action of force 4i^+j^+3k^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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