If ? and u are angle of projection and initial velocity of a projectile respecti

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If ? and u are angle of projection and initial velocity of a projectile respectively, the total time of flight, is given by
Options
A.
B.
C.
D.

Correct Answer

Applied Mechanics problems

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1. Two shots fired simultaneously from the top and bottom of a vertical tower with elevations of 30� and 45� respectively strike a target simultaneously. If horizontal distance of the target from the tower is 1000 m, the height of the tower is
Options
A. 350 m
B. 375 m
C. 400 m
D. 425 m.

2. ? is coefficient of friction. A wheeled vehicle travelling on a circular level track will slip and overturn simultaneously if the ratio of its wheel distance to the height of its centroid, is
Options
A. ?
B. 2?
C. 3?
D. ?.

3. The instantaneous centre of a member lies at the point of intersection of two lines drawn at the ends of the member such that the lines are inclined to the direction of motion of the ends at
Options
A. 30�
B. 45�
C. 60�
D. 90�

4. The maximum frictional force which comes into play, when a body just begins to slide over the surface of a an other body, is known
Options
A. sliding friction
B. rolling friction
C. limiting friction
D. none of these.

8. 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 ?.

9. 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.

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