If an astronaut pushes on a box in space, how many forces are involved in this interaction? A. One B. Two C. Three D. Four

B. Two.

Explanation:

-Please look at these, I think these might be all of your answers!

https://quizlet.com/mx/447141459/newtons-thrid-law-flash-cards/

There are two forces resulting from this interaction - a force on the chair and a force on your body. These two forces are called action and reaction forces and are the subject of Newton's third law of motion. Formally stated, Newton's third law is: For every action, there is an equal and opposite reaction.

However, In the absence of any forces, no force is required to keep an object moving.

This seems like a simple question, but if you wanted to get technical it would in fact be two forces. As there is still a miniscule amount of gravity.

answer and explanation;

electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.