Off Spin -One finger Variation #shorts

DNA finger printing

Spreading the fingers aparts is

One twirls a circular ring (of mass and radius ) near the tip of one’s finger as shown in Figure 1. In the process the finger never loses contact with the inner rim of the ring. The finger traces out the surface of a cone, shown by the dotted line. The radius of the path traced out by the point where the ring and the finger is in contact is ?. The finger rotates with an angular velocity 2_(0). The rotating ring rolls without slipping on the outside of a smaller circle described by the point where the ring and the finger is in contact (Figure 2). The coefficient of friction between the ring and the finger is mu and the acceleration due to gravity is g. The minimum vlaue of omega_(0) below which the ring will drop down is

Basis of DNA finger printing is

There are 7 distinguishable rings. The number of possible five - rings arrangements on the four fingers (except the thumb) of one hand (the order of the rings on each finger is to be counted and it is not required that each finger has a ring is equal to

The DNA finger printing relies on

Father of DNA finger printing is