Why it is more difficult to revolve a stone by tying it to a longer string than by tying it to a shorter string ?

Why is it difficult to hold a school bag having strap made of thin and strong string?

Two light strings of length 4cm and 3 cm are tied to a bob of weight 500 gm .The free ends of the strings are tied to pegs in the same horizontal line and separated by 5 cm .The ratio of tension in the longer string to that in the shortest string is

An uniform sphere is at rest and in equilibrium with the help of two vertical strings of unequal length larger string has length '2l' and shorter has length ('7l')/(5) . Both strings and centre of sphere are in one plane. Radius of sphere is l . If ratio of fundamental frequancy in longer wire to shorter wire is k then 5sqrt(5k) is (both strings are of same material)

A stone tied to a string is rotated with a uniform speed in a vertical plane. If mass of the stone is m , the length of the string is r and linear speed of the stone is v when the stone is at its lowest point, then the tension in the string will be (g= acceleration due to gravity)

A stone attached to one end of string is revolved around a stick so that the string winds upon the stick and gets shortened. What is conserved ?