The boy of mass 30 kg is at r1= 2 meters from the fulcrum. of the girl is 45 kg, at what r2 must she sit so that they are balanced ?

here we need to balance the torque due to weight of boy with the torque due to weight of girl on the other side

so here we can say

(weight of boy) x (his distance from fulcrum) = (weight of girl) x (her distance from fulcrum)

so girl distance from fulcrum must be 1.33 m

asthenosphere and convection

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2