: A boy of mass 40 kg climbs on a rope
which can withstand a maximum tension
of 600 N. In which of the following cases
will the rope break?
Select one:
a. climb down with an acceleration
of 4 m/s2
b. Falls down the rope nearly under
gravity
c. climbs up with an acceleration of
6 m/s2
d. climb up with uniform speed of
5 m/s​

5 w for 1hr = 5x60x60 joules=300x60=3000x6=18,000j as total energy conversion. efficiency of bulb needed for radiant to thermal within 18000

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