Answer:
The total momentum of a system is conserved only when the system is closed.
Explanation:
The gravitational force of attraction between two objects would be increased by "decreasing the distance between two objects"
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The Generator transforms the mechanical energy of the turbine into electrical energy.
Answer:
New force, 
Explanation:
The electrostatic force between two spheres is given by :

According to given condition, each of the spheres has lost half its initial charge, new force is given by :



So, the new force becomes (1/4)th of the initial force. Hence, the correct option is (d).
Answer:
4
Explanation:
because

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