A polyester fabric rope of diameter 3 cm has a breaking strength of 150KN . If it is required to have 600KN breaking strength . What should be the diameter of similar rope in cm ?

If the breaking strength of a rod of diameter 2cm is 2xx10^5N , then that for a rod of same material and diameter 1cm will be

The length of a wire of diameter 0.8 mm is 2.5 m, IF the breaking stress for the material of the wire is 3 times 10^7 kg.m^-2 , then find the load that should be hung from the end of that wire so that it snaps.

A magnetised steel wire of length 32.8 cm has pole -strength 1A.m If the wire is bent in the form of a semicircle , what will be its magnetic moment ?

A lift of mass 2000 kg is supported by thick steel ropes. If maximum upward acceleration of the lift be 1.2 m//s^(2) , and the breaking stress for the ropes be 2.8 xx 10^(8) N/ m^(2) , what should be the minimum diameter of the rope?

A square metal plate of side 100 cm at 0^(@)C , has a circular hole of diameter 40 cm in the middle of it. At what temperature, will each side by 101 cm long? What will be the diameter of the hole at that temperature? alpha for the metal =12.5 times 10^(-6@)C^(-1)

A solid sphere of diameter 2 cm and of mass 20 g is rolling with a velocity of 3 cm. s^(-1) . What is the total kinetic energy of the sphere?

If the distance between two north poles of equal strength be 2 cm , the mutual force of repulsion between them becomes 2.5 dyn . What should be the distance of separation between them for which the repulsive becomes 3.6 dyn ?