Forces in equilibrium

The minimum number of forces of equal magnitude in a plane that can keep a particle in equilibrium is

The minimum number of unequal forces in a plane that can keep a particle in equilibrium is

Three forces of magnitude 30, 60 and P Newton acting on a particle and particle is in equilibrium. If the angle between the first two forces is 60^(@) , the value of P is

An external force of 10 newton acts normally on a square area of each side 50 cm. The stress produced in equilibrium state is

Assertion : A body subjected to three concurrent forces cannot be in equilibrium. Reason : If large number of concurrent forces acting on the same point, then the point will be in equilibrium, if sum of all the forces is equal to zero.

If the four forces as shown are in equilibrium Express vecF_(1)& vecF_(2) in unit vector form.

Find the value of the unknow force if the given set of force shown in figure are in equilibrium.

Molecular forces exist between the molecules of a liquid in a container. The molecules on the surface have unequal force leading to a tension on the surface. If this is not compensated by a force, the equilibrium of the liquid will be a difficult task. This leads to an excess pressure on the surface. The nature of the meniscus can inform us of the direction of the excess pressure. The angle of contact of the liquid decided by the forces between the molecules, air and container can make the angle of contact. In a meniscus of radius r , with excess pressure p in atmospheric pressure p_(0) , the force experienced is

A body is said to be in equilibrium if all the forces acting on it