Excess electrons are placed on a small lead sphere with mass6.80 g so that its net charge is-3.00 Excess electrons are placed on a small lead sphere 10-9 C. (a) Find the number of excess electrons on thesphere.
(b) How many excess electrons are there per lead atom? The atomicnumber of lead is 82, and its atomic mass is 207 g/mol.

Aboxcar traveling at 12 m/s approaches a string of 5 identical boxcars sitting stationary on the track. the moving boxcar collides and links with the stationary cars and they all move off together along the track. what is the final speed of the cars immediately after the collision? (you may take the mass of each boxcar to be 18,537 kg.)

Avoltaic cell converts chemical energy to

Newtons view of arrangement of the universe