So what does everyone think about these photos they were taken about two or three years ago

Calculate the amount of heat produced when 18000 coulombs of charge is transferred in one hour through a potential difference of 50v

We put a force of 50n on an object and the acceleration is 100 m/s². what is the mass of the object?

Athin nonconducting rod with a uniform distribution of positive charge q is bent into a circle of radius r. the central perpendicular axis through the ring is a z-axis, with the origin at the center of the ring. a) what is the magnitude of the electric field due to the rod at z = 0? n/c (b) what is the magnitude of the electric field due to the rod at z = infinity? n/c (c) in terms of r, at what positive value of z is that magnitude maximum? r (d) if r = 4.00 cm and q = 9.00 µc, what is the maximum magnitude? n/c