Related Questions
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Two balls of equal mass and of perfectly elastic material are lying on the floor. One of the balls with velocity v is made to strike the second ball. Both the balls after impact will move with a velocity
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Static friction is always __________ dynamic friction.
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The range of a projectile is maximum, when the angle of projection is
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A pair of smith's tongs is an example of the lever of
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The resultant of two forces P and Q (such that P > Q) acting along the same straight line, but in opposite direction, is given by
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4
The total energy possessed by a system of moving bodies
A. Is constant at every instant
B. Varies from point to point
C. Is maximum in the start and minimum at the end
D. Is minimum in the start and maximum at the end
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4
A force acting on a body may
B. Balance the other forces acting on it
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The algebraic sum of moments of the forces forming couple about any point in their plane is
A. Equal to the moment of the couple
C. Both of above are correct
D. Both of above are wrong
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The motion of a particle round a fixed axis is
D. Translatory as well as rotary
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Angle of friction is the
A. Angle between normal reaction and the resultant of normal reaction and the limiting friction
B. Ratio of limiting friction and normal reaction
C. The ratio of minimum friction force to the friction force acting when the body is just about to move
D. The ratio of minimum friction force to friction force acting when the body is in motion
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The term 'Centroid' is
A. The same as centre of gravity
B. The point of suspension
C. The point of application of the resultant of all the forces tending to cause a body to rotate about a certain axis
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The range of projectile on a downward inclined plane is ________ the range on upward inclined plane for the same velocity of projection and angle of projection.
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The forces, which meet at one point and their lines of action also lie on the same plane, are known as
A. Coplanar concurrent forces
B. Coplanar non-concurrent forces
C. Non-coplanar concurrent forces
D. Non-coplanar non-concurrent forces
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The bellow figure shows the three coplanar forces P, Q and R acting at a point O. If these forces are in equilibrium, then
A. P/sin β = Q/sin α = R/sin
B. P/sin α = Q/sin β = R/sin
C. P/sin = Q/sin α = R/sin β
D. P/sin α = Q/sin = R/sin β
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4
A screw jack used for lifting the loads is
B. A non-reversible machine
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A block of mass 20 kg lying on a rough horizontal plane is connected by a light string passing over a smooth pulley to another mass 5 kg, which can move freely in the Vertical direction, as shown in the below figure. The tension in the string will __________ with the increase in coefficient of friction.
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Concurrent forces are those forces whose lines of action
C. Meet on the same plane
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The impact between two lead spheres is approximately equal to an __________ impact.
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A redundant frame is also called __________ frame.
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The velocity ratio in case of an inclined plane inclined at angle θ to the horizontal and weight being pulled up the inclined plane by vertical effort is
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According to parallel axis theorem, the moment of inertia of a section about an axis parallel to the axis through centre of gravity (i.e. IP) is given by(where, A = Area of the section, IG = Moment of inertia of the section about an axis passing through its C.G., and h = Distance between C.G. and the parallel axis.)
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A body of weight W is required to move up on rough inclined plane whose angle of inclination with the horizontal is α. The effort applied parallel to the plane is given by (where μ = tanφ = Coefficient of friction between the plane and the body.)
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The moment of inertia of a solid cylinder of mass m, radius r and length l about the longitudinal axis or polar axis is
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The centre of gravity of a quadrant of a circle lies along its central radius (r) at a distance of
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In a framed structure, as shown in the below figure, the forces in the members AB and BC are respectively
A. √3. W (tensile) and 2W (compressive)
B. 2W (tensile) and √3. W (compressive)
C. 2√3. W (tensile) and 2√3. W (compressive)
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The coefficient of friction depends upon
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The unit of energy in S.I. units is
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Coplanar non-concurrent forces are those forces which __________ at one point, but their lines of action lie on the same plane.
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The forces, which meet at one point, but their lines of action do not lie in a plane, are called
A. Coplanar non-concurrent forces
B. Non-coplanar concurrent forces
C. Non-coplanar non-concurrent forces
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The maximum mechanical advantage of a lifting machine is