#8 | Angular Variables
(Physics) > Systems of Particles and Rotational Motion
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A couple produces:                                                               [NTSE 1995; CBSE PMT 1997; DCE 2004]

(1) Purely linear motion

(2) Purely rotational motion

(3) Linear and rotational motion

(4) No motion

 

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A wheel is rotating at the rate of 33 rev/min.  If it comes to stop in 20 s. Then, the angular retardation will be

(1) πrads2                          (2) 11π rad/s2

(3) π200 rad/s2              (4) 11π200 rad/s2

 

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A constant torque of 1000 N-m turns a wheel of moment of inertial 200 kg-m2 about an axis through its centre. Its angular velocity after 3 s is

1. 1 rad/s

2. 5 rad/s

3. 10 rad/s

4. 15 rad/s

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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

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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

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