A wheel is rotating 900 rpm about its axis. When power is cut off it comes to rest in 1 min. The angular retardation in rad/s2 is 

1. π/2

2. π/4

3. π/6

4. π/8

Subtopic:  Rotational Motion: Kinematics | Torque |
 87%
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An automobile engine develops 100 kW when rotating at a speed of 1800 rev/min. What torque does it deliver ?

1. 350 N-m

2. 440 N-m

3. 531 N-m

4. 628 N-m

Subtopic:  Torque |
 69%
From NCERT
PMT - 2000
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In an orbital motion, the angular momentum vector is 

1. Along the radius vector

2. Parallel to the linear momentum

3. In the orbital plane

4. Perpendicular to the orbital plane

Subtopic:  Angular Momentum |
 75%
From NCERT
AIIMS - 2004
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A wheel is at rest. Its angular velocity increases uniformly and becomes 80 rad/s after 5 s. The total angular displacement is 

1. 800 rad

2. 400 rad

3. 200 rad

4. 100 rad

Subtopic:  Rotational Motion: Kinematics |
 70%
From NCERT
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A force\(- F \hat k\) acts on O, the origin of the coordinate system. The torque at the point (1, -1) will be:

1. -Fi^+j^

2. Fi^+j^

3. -Fi^-j^

4. Fi^-j^

Subtopic:  Torque |
From NCERT
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A wheel whose moment of inertia is 12 Kgm2 has an initial angular velocity of 40 rad/sec. A constant torque of 20 Nm acts on the wheel. The time in which the wheel is accelerated to 100 rad/sec is

1.  72 seconds

2.  16 seconds

3.  8 seconds

4.  36 seconds

Subtopic:  Rotational Motion: Kinematics | Torque |
 82%
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A constant torque acting on a uniform circular wheel changes its angular momentum from A0 to 4 A0 in 4s. The magnitude of this torque is 

1. 3A04

2. 4 A0

3. A0

4. 12 A0

Subtopic:  Angular Momentum |
 88%
From NCERT
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A solid cylinder rolls down an inclined plane that has friction sufficient to prevent sliding. The ratio of rotational energy to total kinetic energy is

1.  12

2.  13

3.  23

4.  34

 

Subtopic:  Rolling Motion (OLD NCERT) |
 70%
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A swimmer while jumping into water from a height easily forms a loop in the air, if

1. He pulls his arms and legs in
2. He spreads his arms and legs
3. He keeps himself straight
4. None of the above
Subtopic:  Moment of Inertia |
 78%
From NCERT
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Assertion : A ladder is more apt to slip when you are high up on it than when you just begin to climb

Reason : At the high point on a ladder, the torque is large and on climbing up the torque is small

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
Subtopic:  Torque |
 78%
From NCERT
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