A spring 40 mm long is stretched by the application of a force. If 10 N force required to stretch the spring through 1 mm, then work done in stretching the spring through 40 mm is

1. 84J

2. 68J

3. 23J

4. 8J

Subtopic:  Elastic Potential Energy |
 56%
From NCERT
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Two springs with spring constants k1 = 1500 N/m and k2 = 3000 N/m are stretched by the same force. The ratio of potential energy stored in the springs will be 

1. 2:1

2. 1:2

3. 4:1

4. 1:4

Subtopic:  Elastic Potential Energy |
 56%
From NCERT
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A block of mass 2 kg moving with velocity of 10 m/s on a smooth surface hits a spring of force constant 80×103 N/m as shown. The maximum compression in the spring is

1. 5 cm

2. 10 cm

3. 15 cm

4. 20 cm

Subtopic:  Elastic Potential Energy |
 70%
From NCERT
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A block of mass m = 25 kg on a smooth horizontal surface with a velocity v =3 ms-1 meets the spring of spring constant k = 100 N/m fixed at one end as shown in the figure. The maximum compression of the spring and velocity of the block as it returns to the original position respectively are: 

   

1.  1.5 m, -3 ms-1

2.  1.5 m, 0 ms-1

3.  1.0 m, 3 ms-1

4.  0.5 m, 2 ms-1

Subtopic:  Elastic Potential Energy |
 73%
From NCERT
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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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Two springs have their force constant as k1 and k2(k1>k2). When they are stretched by the same force 

(1) No work is done in case of both the springs

(2) Equal work is done in case of both the springs

(3) More work is done in case of second spring

(4) More work is done in case of first spring

Subtopic:  Elastic Potential Energy |
 65%
From NCERT
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The potential energy of a certain spring when stretched through a distance ‘S’ is 10 joule. The amount of work (in joule) that must be done on this spring to stretch it through an additional distance ‘S’ will be:

(1) 30

(2) 40

(3) 10

(4) 20

Subtopic:  Elastic Potential Energy |
From NCERT
PMT - 2002
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A spring of force constant 800 N/m has an extension of 5cm. The work done in extending it from 5cm to 15 cm is:

(1) 16 J

(2) 8 J

(3) 32 J

(4) 24 J

Subtopic:  Elastic Potential Energy |
 83%
From NCERT
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A spring of spring constant 5 × 103 N/m is stretched initially by 5cm from the unstretched position. Then the work required to stretch it further by another 5 cm is 

(1) 6.25 N-m

(2) 12.50 N-m

(3) 18.75 N-m

(4) 25.00 N-m

Subtopic:  Elastic Potential Energy |
 71%
From NCERT
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A mass of 0.5kg moving with a speed of 1.5 m/s on a horizontal smooth surface, collides with a nearly weightless spring of force constant k = 50 N/m. The maximum compression of the spring would be 

(1) 0.15 m

(2) 0.12 m

(3) 1.5 m

(4) 0.5 m

Subtopic:  Elastic Potential Energy |
 81%
From NCERT
PMT - 2004
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