A stone tied to the end of a string of 11 m long is whirled in a horizontal circle with a constant speed. If the stone makes 2222 revolutions in 4444 s, what is the magnitude and direction of acceleration of the stone?

1. π24π24 ms–2 and direction along the radius towards the center
2. π2π2 ms–2 and direction along the radius away from the center
3. π2π2 ms–2 and direction along the radius towards the center
4. π2π2 ms 2 and direction along the tangent to the circle

Subtopic:  Circular Motion |
 73%
From NCERT
PMT - 2005
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If the equation for the displacement of a particle moving on a circular path is given by θ=2t3+0.5θ=2t3+0.5 where θθ is in radians and tt in seconds, then the angular velocity of the particle after 22 sec from its start is:
1. 88 rad/sec
2. 1212 rad/sec
3. 2424 rad/sec
4. 3636 rad/sec

Subtopic:  Circular Motion |
 82%
From NCERT
AIIMS - 1998
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For a particle in a non-uniform accelerated circular motion 

1. Velocity is radial and acceleration is transverse only

2. Velocity is transverse and acceleration is radial only

3. Velocity is radial and acceleration has both radial and transverse components

4. Velocity is transverse and acceleration has both radial and transverse components

Subtopic:  Circular Motion |
 61%
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The coordinates of a moving particle at any time tt are given by x=αt3x=αt3 and y=βt3.y=βt3. The speed of the particle at a time tt is given by:

1. α2+β2α2+β2 2. 3tα2+β23tα2+β2
3. 3t2α2+β23t2α2+β2 4. t2α2+β2t2α2+β2
Subtopic:  Speed & Velocity |
 80%
From NCERT
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The figure shows a body of mass m moving with a uniform speed v along a circle of radius r. The change in velocity in going from A to B is:

1. v2v2

2. v/2v/2

3. v

4. zero

Subtopic:  Circular Motion |
 65%
From NCERT
PMT - 2004
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A particle moves in a circular path with decreasing speed. Choose the correct statement. 

(1) Angular momentum remains constant

(2) Acceleration (aa) is towards the center

(3) Particle moves in a spiral path with decreasing radius

(4) The direction of angular momentum remains constant

Subtopic:  Projectile Motion |
From NCERT
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The angle turned by a body undergoing circular motion depends on time as θ=θ0+θ1t+θ2t2θ=θ0+θ1t+θ2t2. Then the angular acceleration of the body is 

(1) θ1

(2) θ2

(3) 2θ1

(4) 2θ2

Subtopic:  Circular Motion |
 85%
From NCERT
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A stone is just released from the window of a train moving along a horizontal straight track. The stone will hit the ground following

(1) Straight path

(2) Circular path

(3) Parabolic path

(4) Hyperbolic path

Subtopic:  Projectile Motion |
 83%
From NCERT
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An aeroplane is flying at a constant horizontal velocity of 600 km/hr at an elevation of 6 km towards a point directly above the target on the earth's surface. At an appropriate time, the pilot releases a ball so that it strikes the target at the earth. The ball will appear to be falling

(1) On a parabolic path as seen by pilot in the plane

(2) Vertically along a straight path as seen by an observer on the ground near the target

(3) On a parabolic path as seen by an observer on the ground near the target

(4) On a zig-zag path as seen by pilot in the plane

Subtopic:  Projectile Motion |
 77%
From NCERT
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A bomb is dropped from an aeroplane moving horizontally at constant speed. When air resistance is taken into consideration, the bomb 

(1) Falls to earth exactly below the aeroplane

(2) Fall to earth behind the aeroplane

(3) Falls to earth ahead of the aeroplane

(4) Flies with the aeroplane

Subtopic:  Projectile Motion |
 66%
From NCERT
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