Calculus
posted by chamy .
The seesaw principle: As you probably know, any two persons can balance each other
when sitting on opposite sides of a seesaw, regardless of their weights. It is only necessary
that each person contribute the same moment â€” calculated by multiplying the personâ€™s
weight times the distance to the fulcrum. For example, if an 80
pound child sits at one end of a 20foot plank, 10 feet from the
fulcrum, a 200pound adult can balance this system. Tell how.

Calculus 
Damon
200 x = 10 * 80
x = 4
Respond to this Question
Similar Questions

Vectors
A 65kg boy is sitting on a seesaw 0.6 m from the balance point. How far from the balance point should a 40kg girl sit so that the seesaw remains balance? 
math
A 65kg boy is sitting on a seesaw 0.6 m from the balance point. How far from the balance point should a 40kg girl sit so that the seesaw remains balance? 
Algebra
Two children balance on opposite ends of a seesaw. One child weighs 45 pounds and the other weighs 38 pounds. The distance between them is 10 feet. What is the distance of each child from the fulcrum (the center balance point of the … 
algebra
To balance a seesaw, the distance, in feet, a person is from the fulcrum is inversely proportional to the person's weight, in pounds. Peter, who weighs 150 pounds, is sitting 3 feet away from the fulcrum. If Joey weighs 90 pounds, … 
Physics
A seesaw is 4 meters long and is pivoted in the middle. There is a 350 N child on the left end. Where will a 540 N person have to sit to balance the seesaw? 
physics
two children sit at opposite ends of a 60 lb. 10 ft. seesaw which is pivoted at its center one child weighs 50 lbs. and the other 75 lbs. the seesaw is uniform so that its center of gravity is at its geometric center, which also is … 
science
A 10 meter long seesaw has a boy of mass 20 kg sitting on one end . How far away from him should a girl of mass 30kg sit to balance the seesaw? 
science
A uniform plank of a seesaw is 5 meter long and supported at its centre.a boy weighing 40kgf sits at a distance 1.5meter from one end of the seesaw.where must a girl weighing 25kgf sit on the other end of the seesaw so as to balance … 
Physics
Three children are trying to balance on a seesaw. The seesaw is 3.9 m long and pivots about a rock at its center. Louie and Laura are already sitting on opposite ends. If Martha weighs 27 kg, where should she sit so as to balance the … 
Physics
A 75 kg man sits at one end of a uniform seesaw pivoted at its center, and his 24 kg son at the other end. Where would his 55kg wife have to sit to balance the seesaw?