Astudent pushes on a crate with a force of 100n directed to the right. what force does the crate exert on the student?

Newton's 3rd law is: The force of body A on body B, is equal to the force of body B on body A.

This means that the force of the Student on the Crate (100N), is equal to the force of the Crate on the Student.

Which means the Crate also exerts a force of 100N on the student.

100N

Note: Newton's 3rd law can also be written as:

Every force has an opposite and equal reaction.

r=rho l/a where a is the area, l is the length and rho is resistivity so the greater the area the lesser the resistance thats why the earth pin is thicker bcos current follow the shortest path, so less resistive .

i would think it's food chain