A45kg child sits on a 3.2kg tire swing attached to a tree. what is the tension in the rope that hangs from the tree branch?

Explanation:

Tension on the string is total weight of the system

Mass of child = 45 kg

Mass of tire swing = 3.2 kg

Total mass, m = 45 + 3.2 = 48.2 kg

We know that weight is the product of mass and acceleration due to gravity.

Weight = Mass x Acceleration due to gravity

          W = mg

           W = 48.2 x 9.81 = 472.84 N

Tension in the rope = 472.84 N

grav force prop 1/r squared 2r all squared is 4rsquared 1/4rsquared quartered

the minimum amperage that the current in this wire would have to have so that its weight is completely supported by the magnetic force due to earth's field, assuming that no other forces except gravity act on it