How many excess electrons must be distributed uniformly within the volume of an isolated plastic sphere 28.0 cmcm in diameter to produce an electric field of 1050 N/CN/C just outside the surface of the sphere?

What is the scientific definition of energy that relates to work

Which changes would result in a decrease in the gravitational force btween two objects? check all that apply

Calculate the first and second velocities of the car with four washers attached to the pulley, using the formulas v1 = 0.25 m / t1 , and v2 = 0.25 m / (t2 – t1) where t1 and t2 are the average times the car took to reach the 0.25 and the 0.50 meter marks. record these velocities, to two decimal places, in table e.