How did thomson know atoms had an overall neutral charge? he knew there were negative electrons but he came to the conclusion that the rest of the atom was positively charged, why was this? how did he know it would be positively charged?

He reasoned that there must be a source of positive charge within the atom to counterbalance the negative charge on the electrons.

the small 0.38-kg slider is known to move from position a to position b along the vertical-plane slot. determine (a) the work done on the body by its weight and (b) the work done on the body by the spring. the distance r = 0.70 m, the spring modulus k = 154 n/m, and the unstretched length of the spring is 0.53 m

explanation:

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