Wo charged spheres are 1.5 m apart and are exerting an electrostatic force (fo) on each other. if the charge on each sphere decreases by a factor of 9, determine (in terms of fo) how much electrostatic force each sphere will exert on the other.

F0 / 81

Explanation:

Let the two charges by Q and q which are separated by d.

By use of coulomb's law

F0 = k Q q / d^2      (1)

Now the charges are decreased by factor of 9.

Q' = Q / 9

q' = q / 9                 (2)

Now the Force is

F' = k Q' q' / d^2

F' = k (Q /9) (q / 9) / d^2

F' = k Q q / 81d^2

F' = F0 / 81      

no sign of dia of fuel cell

jupiter is the largest planet in our solar system, having a mass and radius that are respectively, 318 and 11.2 times that of earth. suppose that an object falls from rest near the surface of each planet and that the acceleration due to gravity remains constant during the fall. each object falls the same distance before striking the ground. determine the ratio of the time of fall on jupiter to that on earth.