A person pushes a box of mass 4 kg along a horizontal, frictionless surface with a force of 48 N, causing the box to accelerate at 12 m/s. What is the magnitude of the force exerted by the box on the person

Two identical small charged spheres are a certain distance apart, and each one initially experiences an electrostatic force of magnitude f due to the other. with time, charge gradually leaks off of both spheres. when each of the spheres has lost half its initial charge, the magnitude of the electrostatic force will be

You can decrease the resistance of a length of wire by

If a negatively charged particle is placed at rest in an electric potential field that increases in the positive x-direction, what will the particle do? a. accelerate in the positive x-direction b. remain at rest c. accelerate in the negative x-direction