Aparallel-plate capacitor has circular plates and no dielectric between the plates. each plate has a radius equal to 2.8 cm and the plates are separated by 1.1 mm. charge is flowing onto the upper plate (and off the lower plate) at a rate of 4.1 a. find the time rate of change of the electric field between the plates.

Apositive rod is placed to the left of sphere a, and the spheres are separated. which best describes the spheres? sphere a is negative and sphere b is positive because protons from sphere a are attracted to the rod and move to sphere b. sphere a is negative and sphere b is positive because electrons from sphere b are attracted to the rod and move to sphere a. sphere a is positive and sphere b is negative because electrons from the rod move to sphere b and protons then move to sphere a. sphere a is positive and sphere b is negative because protons move from sphere b to the rod and also to sphere a.

Why does the input force have to be greater than the force needed to lift the bale?

In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j? 1. write the equation 2.list out your known variables 3.plug the numbers into the equations 4.solve 5.write your solution statement that includes initial energy and final