The ampere is a unit of
a. magnetism.
b. electric current.
c. electric charge.
d. temperature.

The correct answer is B) electric current.

An ampere is a unit of electric current.

We are talking about electricity. An ampere can be defined as the "unit of measure of the rate of the electron flow." The current in an electrical conductor is an ampere. A French physicist, Adree Marie Amper (1775-1836) established the amper's law of electromagnetism, during his experiments. He also proposed the existence of non-visible particles that later were known as the Electron.

jupiter is the largest planet in our solar system, having a mass and radius that are respectively, 318 and 11.2 times that of earth. suppose that an object falls from rest near the surface of each planet and that the acceleration due to gravity remains constant during the fall. each object falls the same distance before striking the ground. determine the ratio of the time of fall on jupiter to that on earth.

one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.