What is the net force acting on the piano?
0 11,500 N
0 -11,500 N
0 500 N
0 -500 N

Which changes of state do the labels represent? a: b: c:

If an atom contains 11 protons in its nucleus, predict the element with the atomic number and electronic configuration. will the number of electrons remain the same during the chemical reaction in such an atom? explain.

Looking at this barometer, is the air pressure high or low? what type of weather would you expect? high, bad low, bad high, good low, good