It is somewhat similar as we derive electric field inside a dielectric sphere.
=>1st approach
use gauss law for finding out the electric field inside a dielectric sphere. it will come to be Qx/4*pi*epsilon*R^3
simply replace 4(pi)esilon by G and Q by M-mass of earth, you will get the formula of...
Let there be a space shuttle moving at very high speed relative to Earth so, actually time would be slower in the shuttle than on the earth.But, if we see everything relative to shuttle then, Earth is moving at very high speed that, means Earth is slower.
These two things are contradicting. So...
I could not get what actually your doubt is. You are yourself solving all your doubts.
Initially angular momentum was non-zero. When you brought them in contact to each other, net force on the system is zero but, still there is a net torque on the system as the direction of torque is same. As...