Select all the correct answers.
which two statements are true?
the definitions for electric force and electromagnetic force are identical.
electric forces and magnetic forces are different aspects of a single electromagnetic force.
the operation of a motor depends on the relationship between electric and magnetic forces.
d
a magnet must be moving for a magnetic force field to exist.

Plss anybody know how to do this? ? i need the answers from a through d

Amira pulls a 3 pound wagon 4 feet. how much work has she done?

A5 foot by 5 foot box culvert is buried 6 feet beneath the surface of the ground. a crosssection of this very long culvert (into and out of the page) is illustrated below. assume that the soil in which the culvert is buried has the following properties: jt = 120 pcf, w = 12%, ko = 0.50, ka = 0.33, and kp = 3.00. calculate the total horizontal force per unit length of culvert (fh) felt on one of the vertical faces of the culvert.