23. two spheres, with radii of r, are in contact with each other and attract each other with a force of f. if the radii of both of the spheres are cut to half while the density remains the same, what is the new gravitational force between them?

Drop by a factor of 64

Explanation:

By Newtons law of gravity,

where;

G = Universal gravitaional constant

r = distance between center of gravities of two objects

m₁,m₂ = masses of thee objects.

F = Gravitational force.

m =  (mass = volume into density.

So when radius is halved, mass drops by a factor of 8,

m' =

     =

So in substitution to the equation,

the answer is a 3.8cm

explanation:

friction

explanation:

they us to move forward and backwards