## Applied Mechanics and Graphic Statics Lami's theorem states that

Three coplanar forces acting at a point will be in equilibrium, if each force is proportional to the sine of the angle between the other two
Three forces acting at a point are always in equilibrium
Three coplanar forces acting at a point will be in equilibrium if each force is inversely proportional to the sine of the angle between the other two
If three forces acting on a point can be represented in magnitude and direction by the sides of a triangle, the point will be in the state of equilibrium

2R/r1 + r2
2R/r1
R/r1 - r2
3R/r1 - r2

## Applied Mechanics and Graphic Statics To double the period of oscillation of a simple pendulum

The mass of its bob should be quadrupled
The mass of its bob should be doubled
Its length should be doubled

(n - 1)
n (n - 1)/2
n/2
n

## Applied Mechanics and Graphic Statics When a body of mass M1 is hanging freely and another of mass M2 lying on a smooth inclined plane(α) are connected by a light index tensile string passing over a smooth pulley, the acceleration of the body of mass M1, will be given by

g(M1 + M2 sin α)/(M1 + M2­) m/sec
g(M2 × M1 sin α)/(M2 - M1­) m/sec²
g(M1 - M2 sin α)/(M1 + M2­) m/sec²
g(M2 + M1 sin α)/(M1 + M2­) m/sec²

kg-m²
m⁴
kg/m
kg/m²