A cyclist rides at 15km/h and observes the wind appears to come from the north-east. On the return journey, he rides at the same speed in the opposite direction. Now the wind appears to be coming from 30 degrees south of east. Calculate the true
speed and direction of the wind.

28. evolution

29. environment, survive, offspring  

explanation:

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

because if the tool that you are using is not balanced it there would be false mass.