The shaft of a motor starts from rest and attains full speed of 1800 rpm in 10 seconds. The shaft has an angular acceleration of

1.  3π rad/sec2

2.  6π rad/sec2

3.  2π rad/sec2

4.  18π rad/sec2

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4
Correct Answer :

6π rad/sec2


Explanation :
No Explanation available for this question

In the given figure, weight is falling with an acceleration of 4.8 m/sec2. If radius of the wheel is 30 cm, the angular acceleration of the wheel must be

1.  4 rad/sec2

2.  8 rad/sec2

3.  16 rad/sec2

4.  32 rad/sec2

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4
Correct Answer :

16 rad/sec2


Explanation :
No Explanation available for this question

A flywheel 200 cm in diameter is rotating at 100 revolutions per minute. A point on the rim of the flywheel will not have

1.  Angular velocity

2.  Centripetal acceleration

3.  Tangential acceleration

4.  All of these

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4
Correct Answer :

Tangential acceleration


Explanation :
No Explanation available for this question

Two cars are going with constant speeds, round concentric circles of radii r1 and r2, and take the same time to complete their circular paths. Their speeds will correspond to the ratio

1.  1:1

2.  r1 /r2

3.  (r1 /r2)2

4.  r2 /r1

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4
Correct Answer :

r1 /r2


Explanation :
No Explanation available for this question

A stone of mass 1kg is tied to a string of 1m length and whirled in a horizontal circle at a constant angular speed of 5 rad/sec. The tension in the string will be:

1.  5

2.  10

3.  25

4.  Zero

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4
Correct Answer :

25


Explanation :
No Explanation available for this question

Angular speed of a seconds hand of a clock is

1.  πrad/sec

2.  π/6 rad/sec

3.  π/15 rad/sec

4.  π/30 rad/sec

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4
Correct Answer :

π/30 rad/sec


Explanation :
No Explanation available for this question

A sphere rotates uniformly about a vertical axis through its centre. Which one of the following best describes how the linear speed of a point on the surface varies with latitude as one travels from equator to pole (The equator is zero at the equator)

1.  It decreases as first power of latitude

2.  It decreases as cos (latitude)

3.  It is constant

4.  It is constant

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4
Correct Answer :

It decreases as cos (latitude)


Explanation :
No Explanation available for this question

Two bodies of mass M and m are moving in concentric orbits of radii R and r such that their periods are same. Then ratio between their angular velocity is

1.  R: r

2.  mR :Mr

3.  1:1

4.  √(R) /r : m/M

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4
Correct Answer :

1:1


Explanation :
No Explanation available for this question

A cylinder of radius 10c.m rolls without slipping on a horizontal plane. At the instant as shown the magnitude of the velocity of A relative to B is 40cm/sec. The velocity of the centre O at this instant is

1.  10√2 cm/sec

2.  15√2 cm/sec

3.  20√2 cm/sec

4.  25√2 cm/sec

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4
Correct Answer :

20√2 cm/sec


Explanation :
No Explanation available for this question

A person standing on a uniformly rotating turn tables has arms held close to his chest. If he outstretches his arms

1.  The moment of inertia will decrease

2.   The angular momentum will increase

3.  The speed of rotation will increase

4.  The angular velocity will remain constant

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4
Correct Answer :

The speed of rotation will increase


Explanation :
No Explanation available for this question
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