Suppose gravity of earth suddenly becomes zero, then in which direction will the moon begin to move if no other celestial body affects it?

The Earth and the moon experience equal gravitational forces from each other. However, the mass of the Earth is much larger than the mass of the moon. Hence, it accelerates...

Law of conservation of momentum is applicable to isolated system (no external force is applied). In this case, the change in velocity is due to the gravitational force of earth.

Yes, you wrote right.

(d) remain standing. Explanation: The person will loose weight but remain standing. As no force acts on him, so according to "Newton's First Law of Motion" he will remain in his state of rest...

(d) : The centre of mass of bodies B and C taken together does not shift as no external force is applied horizontally.

(b) : The centripetal and centrifugal forces disappear, the satellite has the tangential velocity and it will move in a straight line Compare Lorentzian force on charges in the cyclotron.

(b) 0.0027 m/s2    Explanation:  When moving in the orbit, the moon balances the force on it by the earth with its uniform circular motion in the orbit resulting in centrifugal force. When...

(b ) ​U>K. EXPLANATION:  Let the mass of the moon = m, velocity v and its distance from the earth = a.   v = √(GM/a), K.E. = K = ½mv² = ½m*GM/a  →GMm/a = 2K  The...

(b) : Since electronic charge (1.6 × 10–19C) universal constant. It does not depend on g. Therefore,Electronic  charge on the moon = electronic charge on the earth or (electronic charge on the...

(d) remain standing. Explanation: The person will loose weight but remain standing. As no force acts on him, so according to "Newton's First Law of Motion" he will remain in his state...