You are taking care of two small children, sarah and rachel, who are twins. on a nice cool, clear day you decide to take them rollerblading. to travel down the smooth sidewalk you have sarah hold your hand and rachel's hand. the three of you form a straight line as you skate, and the two children just glide behind you. sarah must reach up at an angle of 60 degrees to grasp your hand, but she grabs rachel's hand horizontally. since the children are twins, they are the same height and the same weight, 23 kg. to get started you accelerate at 2.0 m/s2 . you are concerned about the force on the children's arms, which might cause shoulder damage, so you calculate the force sarah exerts on rachel's arm, and the force you exert on sarah's other arm. you assume that the frictional forces of the sidewalk on the rollerblades are negligible.

Explanation:

Rachel and Sarah are standing on horizontal ground . Let T₁ be the tension between Rachel and Sarah and Sarah is in between you.

Force = mass x acceleration

Apply this equation on Rachel

T₁ = 23 x 2 = 46 N

Let T₂ be tension between Sarah and me and it is inclined at 60°

Force = mass x acceleration

Apply this equation on Sarah

T₂ cos 60 - T₁ = 23 X 2 = 46

T₂ cos 60 - 46 =46

T₂ cos 60  = 92

T₂ = 92 / .5

= 184 N

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