If three forces acting in one plane upon a rigid body, keep it in equilibrium, then they must either__________________?

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Which is the correct statement about law of polygon of forces ?

A. if any number of forces acting at a point can be represented by the sides of a polygon taken in order, then the forces are in equilibrium B. if any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon, then the forces are … Which is the correct statement about law of polygon of forces ?Read More...

Center of gravity of a solid cone lies on the axis at the height_______________?

A. one-fourth of the total height above base B. one-third of the total height above base C. one-half of the total height above base D. three-eighth of the total height above the base E. none of the above...

Kinetic friction is the________________?

A. tangent of angle between normal reac-tion and the resultant of normal reac-tion 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 E. dynamic friction...

The resultant of the following three couples 20 kg force, 0.5 m arm, $ ve sense 30 kg force, 1 m arm, – ve sense 40 kg force, 0.25 m arm, + ve sense having arm of 0.5 m will be_________________?

A. 20 kg, – ve sense B. 20 kg, + ve sense C. 10 kg, + ve sense D. 10 kg, – ve sense E. 45 kg, + ve sense...

If a rigid body is in equilibrium under the action of three forces, then_______________?

A. these forces are equal B. the lines of action of these forces meet in a point C. the lines of action of these forces are parallel D. B. and C. above E. none of the above...