Branos

Q2) When the doubt between a co-ordinate and a double bound happens, there's always a chalcogen involved as a peripheral atom. In this case, there are 3, 2 O's and a S. So that's the hint: First, complete the octet of the central atom with double bonds. Than, all the other bonds will be co-ordinate. In the ion thiosulfate, one sulfur is the central atom and the other is a peripheral atom. The central atom makes a double bond with an oxygen. With it, it's octet is complete, therefore, all the others bonds will be co-ordinate. However, because there is more than one bond with oxygen, there will be a resonance in the molecule. So, the following lewis structure is just a representation of one of the canonic forms of the ion:

Using a fictional force, I can solve the problem. The fictional force has a components that's parallel to the cone and points up. But that's the point: I want do solve it in a inertial referential! According to Newton's Law of motion, any problem that can be solved in a non-inertial referential can also be solved in a inertial referential. Why doesn't this apply to this question? (Off topic: I can be any lepton I want? Like a positron, for example? =D)

Hello. I'm from Brazil, so my English isn't very good, sorry if I make a grammar mistake. I have a question about motion in a rotating plain. Actually, I can solve the question, but I'm missing a point: That's the question: There's a box in a cone. The cone has a friction coefficient of μ. The box's mass is M. The angle that the cone does with the ground is θ. The gravity field is g. The cone is spinning with a constant angular velocity. The problem asks to find the maximum speed V that the box can move (in this case, it's a circular motion) without go up, using only μ, M, θ and g. In the figure, I represented the force diagram by the perspective of a inertial referential. "N" is the normal force, "F" is the friction force and "W" is the weight. I found the speed V by equaling the components of the force parallel to the ground with the formula for the centripetal force. But than I thought: "What force can move the box up?". I couldn't find any component of any force that is parallel to the cone and points up. Please, help me =D