Auniform solid sphere of radius r = 3.5 km produces a gravitational acceleration of ag on its surface. at what distance from the sphere's center are there points (a) inside and (b) outside the sphere where the gravitational acceleration is ag/ 5?

As we know that acceleration due to gravity is given by

Part a)

Inside the sphere

Part b)

Now for a point outside the sphere the gravity is

waves moving from a fast medium to a slow medium will experience a reflection as light travels more slowly than red light. total internal reflection occurs when the critical angle is.

grav forces affect all objects magnetic forces affect magnetic objects and electric currents