Related Questions
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The diagram showing the point of application and line of action of forces in their plane is called
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A weight W is suspended at the free end of a light member hinged to a vertical wall. If the angle of inclination of the member with the upper wall is θ°, the force introduced in the member, is
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4
An ordinate in a funicular polygon represents
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The C.G. of a thin hollow cone of height h, above its base lies on the axis, at a height of
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If two equal forces of magnitude P act at an angle θ, their resultant, will be
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A system of coplanar forces is in equilibrium when
B. Funicular polygon closes
C. Both force polygon and funicular polygon close
D. All the forces are concurrent
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4
The condition for a lifting machine to be reversible is that its efficiency should be
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Time required to stop a car moving with a velocity 20 m/sec within a distance of 40 m, is
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Ball A of mass 250 g moving on a smooth horizontal table with a velocity of 10 m/s hits an identical stationary ball B on the table. If the impact is perfectly elastic, the velocity of the ball B just after impact would be
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Total no of instantaneous centres of a machine having n links, is
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The resultant of two forces P and Q is R. If Q is doubled, the new resultant is perpendicular to P. Then,
D. None of the above is correct
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If the direction of projection bisects the angle between the vertical and the inclined plane, then the range of projectile on the inclined plane is
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Which of the following is a scalar quantity?
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A 49 kg lady stands on a spring scale in an elevator. During the first 5 sec, starting from rest, the scale reads 69 kg. The velocity of the elevator will be
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A particle is executing simple harmonic motion in a line 1.0 m long. If the time of one complete vibration is 1 sec, then the maximum velocity of the particle is
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Power can be expressed as
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Force polygon method is applicable for
A. Any coplanar force system
B. A system of parallel forces only
C. Concurrent coplanar force system
D. Non-concurrent coplanar force system
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A body is dropped from a height of 100 m and at the same time another body is projected vertically upward with a velocity of 10 m/sec. The two particles will
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The member which does not carry zero force in the structure shown in below figure, is
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A rod 5 m in length is moving in a vertical plane. When it is inclined at 60° to horizontal, its lower end is moving horizontally at 3 m/sec and upper end is moving in vertical direction. The velocity of its upper end, is
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At a given instant ship A is travelling at 6 km/h due east and ship B is travelling at 8 km/h due north. The velocity of B relative to A is
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Which of the following represents the state of neutral equilibrium?
A. A cube resting on one edge
B. A smooth cylinder lying on a curved surface
C. A smooth cylinder lying on a convex surface
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In a lifting machine with efficiency 60%, an effort of 200 N is required to raise a load of 6 kN. The velocity ratio of the machine is
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If two bodies of masses M1 and M2(M1 > M2) are connected by alight inextensible string passing over a smooth pulley, the tension in the string, will be given by
A. T = g(M1 - M2)/(M1 + M2)
B. T = g(M1 + M2)/(M1 × M2)
C. T = g(M2 - M1)/(M1 + M2)
D. T = g(M2 + M1)/(M2 - M1)
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Principle of Transmissibility of Forces states that, when a force acts upon a body, its effect is
A. Maximum if it acts at the centre of gravity of the body
B. Different at different points on its line of
C. Same at every point on its line of action
D. Minimum if it acts at the C.G. of the body
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For a self-locking machine, the efficiency should be
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A heavy ladder resting on a floor and against a vertical wall may not be in equilibrium, if
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
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The centre of gravity of a quadrant of a circle lies along its central radius at a distance of
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The motion of a particle moving with S.H.M. from an extremity to the other, constitutes
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The maximum frictional force which comes into play, when a body just begins to slide over the surface of a another body, is known