Question

You and your two younger siblings are playing on a seesaw. Your little brother, whose mass is 25 kg, sits 2.5 meters to the left of the pivot point, and your little sister, whose mass is 35 kg, sits 1 meter to the left of the pivot point. Because you weigh 70 kg, where should you sit to make the seesaw balance

Answer 1

Answer: 1.4 m

Step-by-step explanation:

Given

Mass of siblings are 25kg and 35 kg who sits at 2.5 m and 1 m left to pivot.

Suppose the 70 kg mass sits at a distance x from the pivot towards right.

Torque applied by two siblings must cancel the torque of 70 kg mass i.e.

`\Rightarrow 25* 2.5+35*1=70x\\\Rightarrow 62.5+35=70x\\\\\Rightarrow x=(97.5)/(70)\\\\\Rightarrow x=1.392\approx 1.4\ m`