Answer:
In the absence of external forces and at any point, the sum of the kinetic energy and the potential energy is always constant.
Explanation:
Conservation of energy just means that the total energy is unchanged.
Energy is made up of potential and kinetic, so if the total is unchanged, that means the sum of them is unchanged
the car's friction is reduced to zero
the car's centripetal force drops to zero
the car continues in a straight path from the point at which it encountered the ice
Answer:
the force of attraction between the two charges is 4.2 x 10⁹ N.
Explanation:
Given;
the magnitude of first charge, q₁ = 0.06 C
the magnitude of the second charge, q₂ = 0.07 C
distance between the two charges, r = 3 m
The force of attraction between the two charges is calculated as ;

where;
k is Coulomb's constant = 9 x 10⁹ Nm²/C²

Therefore, the force of attraction between the two charges is 4.2 x 10⁹ N.
Due to the conservation of electric charge, the current is uniform throughout an electrical circuit.
The answer is B.