Which of the following is prohibited by the 2nd law of thermodynamics?
(a) a device that converts heat into work with 100% efficiency
(b) a device that converts work into heat with 100% efficiency.
(c) a device that uses work to supply x heat at high temperature while taking in y heat at lower temperature. where x> y.
(d) a device that converts work into heat with > 100% efficiency

(A) A device that converts heat into work with 100% efficiency

It clearly violates the second law of thermodynamics because it warns that while all work can be turned into heat, not all heat can be turned into work. Therefore, despite the innumerable efforts, the efficiencies of the bodies have only been able to reach 60% at present.

volleyball players can not touch the net while the ball is in play

the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force