Strength of Materials
The magnitude of two forces, which when acting at right angle produce resultant force of VlOkg and when acting at 60° produce resultant of Vl3 kg. These forces are

2 and 5
V5 and V5
3 and 1 kg
2 and V6

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Strength of Materials
According to principle of moments

positive and negative couples can be balanced
the algebraic sum of the moments of any two forces about any point is equal to moment of theiwesultant about the same point
if a system of coplanar forces is in equilibrium, then their algebraic sum is zero
if a system of coplanar forces is in equilibrium, then the algebraic sum of their moments about any point in their plane is zero

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Strength of Materials
Which one of the following statements is not correct

the sine of the angle of repose is equal to coefficient to friction
the tangent of the angle of friction is equal to coefficient of friction
the angle of repose is equal to angle of friction
the tangent of the angle of repose is equal to coefficient of friction

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Strength of Materials
Center of percussion is

the point of metacentre
point of suspension
the point of application of the resultant of all the forces tending to cause a body to rotate about a certain axis
the point of C.G.

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Strength of Materials
In ideal machines

mechanical advantage is equal to velocity ratio
mechanical advantage is less than velocity ratio
mechanical advantage is unity
mechanical advantage is greater than velocity ratio

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