A stone is whirled in a vertical circle, the tension in the string, is maximum w

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Question
A stone is whirled in a vertical circle, the tension in the string, is maximum
Options
A. when the string is horizontal
B. when the stone is at the highest position
C. when the stone is at the lowest position
D. at all the positions.

Correct Answer

when the stone is at the lowest position

Applied Mechanics problems

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1. For a particle moving with a simple harrmonic motion, the frequency is
Options
A. directly proportional to periodic time
B. inversely proportional to periodic time
C. inversely proportional to its angular velocity
D. directly proportional to its angular velocity
E. none of these.

2. Kinetic friction may be defined as
Options
A. friction force acting when the body is just about to move
B. friction force acting when the body is in motion
C. angle between normal reaction and resultant of normal reaction and limiting friction
D. ratio of limiting friction and normal reaction.

4. ω rad/sec is the angular velocity of a crank whose radius is r. If it makes θ� with inner dead centre and obliquity of the connecting rod l is φ, the velocity v of the piston, is given by the equation
Options
A. ω²(l cos φ + r sin φ tan θ)
B. ω²(l sin φ + r cos φ tan θ)
C. ω(l sin φ + r cos φ tan θ)
D. ω²(l sin φ - r cos θ tan φ).

5. A heavy ladder resting on a floor and against a vertical wall may not be in equilibrium, if
Options
A. floor is smooth and the wall is rough
B. floor is rough and the wall is smooth
C. floor and wall both are smooth surfaces
D. floor and wall both are rough surfaces.

6. From the circular plate of a diameter 6 cm is cut out a circular plate whose diameter is equal to radius of the plate. The c.g. of the remainder shifts from the original position through
Options
A. 0.25 cm
B. 0.50 cm
C. 0.75 cm
D. 1.00 cm.

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