Agrapefruit has a weight on earth of 4.9 newtons. what is the grapefruit's mass?

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

Aspring that is stretched 2.6 cm stores a potential energy of 0.053 j. what is the spring constant of this spring?

Why do some scientists and archeologists think that volta was not the first person to build a battery