The velocity ratio of a differential wheel and axle with D as the diameter of effort wheel and d₁,and d₂ as the diameters of larger and smaller axles respectively, is

The force induced in the string BC due to the load W as shown in the below figure is

The time of flight of a projectile on downward inclined plane depends upon

All the steel trusses of the bridges, have one of their end roller supported, and other end hinged. The main advantage of such a support is that the truss remains stable.

Two equal and opposite parallel forces whose lines of action are different, can be replaced by a single force parallel to the given forces.