In a simple screw jack, the pitch of the screw is 9 mm and length of the handle

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Question
In a simple screw jack, the pitch of the screw is 9 mm and length of the handle operating the screw is 45 cm. The velocity ratio of the system is
Options
A. 1.5
B. 5
C. 25
D. 314

Correct Answer

314

Applied Mechanics problems

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1. A body of weight w placed on an inclined plane is acted upon by a force P parallel to the plane which causes the body just to move up the plane. If the angle of inclination of the plane is ? and angle of friction is ?, the minimum value of P, is
Options
A.
B.
C.
D.

3. If two forces each equal to T in magnitude act at right angles, their effect may be neutralised by a third force acting along their bisector in opposite direction whose magnitude will be
Options
A. 2 T
B. 1/2 T
C. 2 T
D. 3 T
E. none of these.

4. If the angle of projection is double the angle of inclination (?) of the plane on which particle is projected, the ratio of times of fligh up the inclined plane and down the inclined plane, will be
Options
A.
B.
C.
D. 2 cos ?.

8. The angle of projection for a range is equal to the distance through which the particle would have fallen in order to acquire a velocity equal to the velocity of projection, will be
Options
A. 30�
B. 45�
C. 60�
D. 75�.

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