Two people are pushing on a desk to the right with a force 15n each what is the net force on the desk

James is trying to prove newton's 2nd law of motion. he tries to move four different objects with different masses, shapes, and sizes from point a to point b. the objects are a toy car, a car, a refrigerator, and a kitchen table. after some experimentation, he finds that force is dependent on the mass of the object, rather than it's size or shape. the object that takes the most force to move is the

Where do magnetic lines of force enter earth?

This is the number of complete movements of a wave per second.