hor·i·zon·tal [hawr-uh-zon-tl, hor-]
adjective
1. at right angles to the vertical; parallel to level ground.
2. flat or level: a horizontal position.
http://dictionary.reference.com/browse/horizontal
I understand the directions just fine. I'm not asking what direction they're pointing in...
I've taken both Physics and Dynamics and I don't think I've ever had to assume that an object is sitting on a surface. It's always been stated in the question or it's obvious (like a moving car, which clearly is on a road). This question immediately struck me as being a non-obvious situation...
Homework Statement
This was an exam question that one of my friends recently had.
Two horizontal forces act on a 32.5kg object. The first force has a magnitude of 210N and points in the direction 40.0 degrees East of North. The second force has a magnitude of 350N and points in the...
The answer to this problem was actually negative. I know that a force vector being positive or negative would indicate direction (which is what I think you were saying).
However, if there were a positive charge and a negative charge (which attract), Coulomb's law would be negative. That's why...
Homework Statement
Calculate the (electrostatic) force between a Ca2+ and an O2– ion the centers of which are separated by a distance of 1.25 nm.
Homework Equations
I know that:
Coulomb's Law is F = (k q1 q2)/r2
Attractive Force is F = (k z1e z2e)/r2
where z1 and z2 are the valence...