A constant force acts on a body of mass 0.9 kg at rest for 10s. If the body moves a distance of 250 m, the magnitude of the force is 

(1) 3 N

(2) 3.5 N

(3) 4.0 N

(4) 4.5 N

Subtopic:  Newton's Laws |
 80%
From NCERT
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Two particles of equal masses are revolving in circular paths of radii r1 and r2 respectively with the same speed. The ratio of their centripetal forces is 

(1) r2r1

(2) r2r1

(3) r1r22

(4) r2r12

Subtopic:  Uniform Circular Motion |
 85%
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If the overbridge is concave instead of being convex, the thrust on the road at the lowest position will be

(1) mg+mv2r

(2) mgmv2r

(3) m2v2gr

(4) v2gr

Subtopic:  Uniform Circular Motion |
 69%
From NCERT
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A particle moves in a circular orbit under the action of a central attractive force inversely proportional to the distance ‘r’. The speed of the particle is 

(1) Proportional to r2

(2) Independent of r

(3) Proportional to r

(4) Proportional to 1/r

Subtopic:  Uniform Circular Motion |
From NCERT
PMT - 1995
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A 500 kg car takes a round turn of radius 50 m with a velocity of 36 km/hr. The centripetal force is 

(1) 250 N

(2) 750 N

(3) 1000 N

(4) 1200 N

Subtopic:  Uniform Circular Motion |
 86%
From NCERT
PMT - 1999
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A stone of mass of 16 kg is attached to a string 144 m long and is whirled in a horizontal circle. The maximum tension the string can withstand is 16 Newton. The maximum velocity of revolution that can be given to the stone without breaking it will be-

(1) 20 ms–1

(2) 16 ms–1

(3) 14 ms–1

(4) 12 ms–1

Subtopic:  Uniform Circular Motion |
 85%
From NCERT
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A point mass m is suspended from a light thread of length l, fixed at O, and is whirled in a horizontal circle at a constant speed as shown. From your point of view, stationary with respect to the mass, the forces on the mass are:

 
 

1. 2.
3. 4.
Subtopic:  Uniform Circular Motion |
 55%
From NCERT
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If a cyclist moving with a speed of 4.9 m/s on a level road can take a sharp circular turn of radius 4 m, then coefficient of friction between the cycle tyres and road is 

(1) 0.41

(2) 0.51

(3) 0.61

(4) 0.71

Subtopic:  Uniform Circular Motion |
 81%
From NCERT
AIIMS - 1999
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A mass is supported on a frictionless horizontal surface. It is attached to a string and rotates about a fixed centre at an angular velocity ω0. If the length of the string and angular velocity are doubled, the tension in the string which was initially T0 is now 

(1) T0

(2) T0/2

(3) 4 T0

(4) 8 T0

Subtopic:  Uniform Circular Motion |
 71%
From NCERT
AIIMS - 1985
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Three identical particles are joined together by a thread as shown in figure. All the three particles are moving in horizontal circles centred at O. If the velocity of the outermost particle is v0, then the ratio of tensions in the three sections of the string is 

(1) 3 : 5 : 7

(2) 3 : 4 : 5

(3) 7 : 11 : 6

(4) 3 : 5 : 6

Subtopic:  Uniform Circular Motion |
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