15) The acceleration of the particle moving with simple harmonic motion is inversely proportional to the displacement of the particle from the mean position.

16) The two links OA and OB are connected by a pin joint at O. If the link OA turns with angular velocity ?₁ rad/s in the clockwise direction and the link OB turns with angular velocity ?₂ rad/s in the c

17) A disturbing mass m1 attached to the rotating shaft may be balanced by a single mass m₂ attached in the same plane of rotation as that of m₁, such that (where r₁ and r₂ are the radii o

18) In railway axle boxes, the bearing used is

19) When the two elements of a pair have a surface contact when relative motion takes place and the surface of one element slides over the surface of the other, the pair formed is known as a