A repulsive force of 53 Newtons exists between a positive charge of 3.6 x 10^-6 C and another charge .05 meters away. Given Coulomb's Constant is K = 8.99 x 10^9, what is the magnitude of the second charge?

Look at the potential energy diagram for a chemical reaction. which statement correctly describes the energy changes that occur in the forward reaction?

An engineer designs a roller coaster so that a car travels horizontally for 152 ft, then climbs 137 ft at an angle of 34.0° above the horizontal. it then moves 137 ft at an angle of 48.0° below the horizontal. if we take the initial horizontal motion of the car to be along the +x-axis, what is the car's displacement? (give the magnitude of your answer, in ft, to at least four significant figures and give the direction of your answer in degrees counterclockwise from the +x-axis.)

Alfred pushes on a heavy box, but cannot move it. the box has a lot of inertia motion friction gravity