Recent content by cowshrptrn

The energy the person exerts to raise himself up h would cause the bag of sand to move up h, since he would be exerting a force F, which would just cause the bag of sand to move up, while he remained in one place

When you start applying it to force and other equations, i you get a negative answer then you know its an attractive force, if its a positive answer its a repulsive force. Yes, calling electrons negative and protons positive is arbitrary, but they need to be positive and negative, not one unit...

you mean electric field, not force since its just one charge, not 2

3 identical masses and four identical springs are set up as shown (m=mass ~=spring |=fixed point) |~m~m~m~| the two outside masses are displaced equally inwards. What is the effective spring constant of this system. attempt at solution: using FBDs F=-2kx on each individual outside mass middle...