Aperson runs at a constant speed around a 100m diameter circular track and completes each lap in 60 sec. what is the magnitude of the runner's average velocity for one fourth of a lap?

1.31 m/s

Explanation:

t = 60sec

d= 100m, r = d/2 = 100/2 = 50m

distance = Circumference= 2πr = 314.2m

one fourth of a lap, d= 314.2/4 = 78.55 m

v = s/t = 78.55/60 = 1.31 m/s

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

conservation of mass

mass before something happens = mass afterwards