Related Questions
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A framed structure, as shown in the below figure, is a
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If two bodies having masses m1 and m2 (m1>m2) have equal kinetic energies, the momentum of body having mass m1 is _________ the momentum of body having mass m2.
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Tension in the cable supporting a lift is more when the lift is moving __________ with an acceleration.
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The angle between two forces when the resultant is maximum and minimum respectively are:
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According to Lamis theorem
A. The three forces must be equal
B. The three forces must be at 120° to each other
C. The three forces must be in equilibrium
D. If the three forces acting at a point are in equilibrium, then each force is proportional to the sine of the angle between the other two
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The velocity of a particle moving with simple harmonic motion is __________ at the mean position.
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The static friction
A. Bears a constant ratio to the normal reaction between the two surfaces
B. Is independent of the area of contact, between the two surfaces
C. Always acts in a direction, opposite to that in which the body tends to move
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In ideal machines
A. Mechanical advantage is greater than velocity ratio
B. Mechanical advantage is equal to velocity ratio
C. Mechanical advantage is less than velocity ratio
D. Mechanical advantage is unity
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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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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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Kinetic friction is the
A. Tangent of angle between normal reaction and the resultant of normal reaction and the limiting friction
B. Ratio of limiting friction and normal reaction
C. The friction force acting when the body is just about to move
D. The friction force acting when the body is in motion
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The moment of inertia of a square of side a about its diagonal is
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The periodic time (T) is given by (where, ω = Angular velocity of particle in rad/s.)
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The Cartesian equation of trajectory is (where u = Velocity of projection, α = Angle of projection, and x, y = Co-ordinates of any point on the trajectory after t seconds.)
A. y = (gx²/2u² cos²α) + x. tanα
B. y = (gx²/2u² cos²α) - x. tanα
C. y = x. tanα - (gx²/2u² cos²α)
D. y = x. tanα + (gx²/2u² cos²α)
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The bellow figure shows the two equal forces at right angles acting at a point. The value of force R acting along their bisector and in opposite direction is
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The amplitude is always __________ radius of the circle.
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The range of a projectile is maximum, when the angle of projection 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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One kg force is equal to
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The law of the machine is (where P = Effort applied to lift the load, m = A constant which is equal to the slope of the line, W = Load lifted, and C = Another constant which represents the machine friction.)
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A semicircular disc rests on a horizontal surface with its top flat surface horizontal and circular portion touching down. The coefficient of friction between semi circular disc and horizontal surface is μ. This disc is to be pulled by a horizontal force applied at one edge and it always remains horizontal. When the disc is about to start moving, its top horizontal force will
B. Slant up towards direction of pull
C. Slant down towards direction of pull
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The C.G. of a solid hemisphere lies on the central radius 3r
A. At distance from the plane base 3r
B. At distance from the plane base 3r
C. At distance from the plane base 3r
D. At distance from the plane base
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The friction experienced by a body, when in motion, is known as
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The resultant of two forces P and Q acting at an angle θ is
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A machine having an efficiency greater than 50%, is known as
B. Non-reversible machine
C. Neither reversible nor non-reversible machine
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The time of flight of a projectile on downward inclined plane depends upon
B. Angle of inclination of the plane
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The moment of the force P about O as shown in the below figure is
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The coefficient of restitution for inelastic bodies is
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A framed structure is perfect, if the number of members are __________ (2j - 3), where j is the number of joints.