How far away must a proton be to produce the same size force on the electron (same size as the gravitational force meg. )? your answer should show why gravity is unimportant on the molecular scale!

Amachinist needs to remove a tight fitting pin of material a from a hole in a block made of material b. the machinist heats both the pin and the block to the same high temperature and removes the pin easily. what statement relates the coefficient of thermal expansion of material a to that of material b? a) the situation is not possible, heating block b will shrink the hole in the material as the material expands with increasing temperatureb) material b has the same coefficient of expansion as does material ac) material b has a negative coefficient of expansion and a has a positive coefficient of expansiond) material a has a greater coefficient of expansion than does material be) material b has a greate

Write down two additional questions about earth's magnetic field that will make your presentation more informative.

Sunidhi made a study chart about changes in states of matter. which headings best complete the chart?