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.

*drag each tile to the correct location in the sequence* the table shows chronological events in the life of our sun, a medium-sized star. place the missing events into the correct rows of the table.

What properties of a moving object are used in determining the object's energy of motion

Air enters a gas turbine with two stages of compression and two stages of expansion at 100 kpa and 17°c. this system uses a regenerator as well as reheating and intercooling – the intercooler returns the air to the inlet temperature. the pressure ratio across each compressor is 4 ; 300 kj/kg of heat are added to the air in each combustion chamber; and the regenerator operates perfectly while increasing the temperature of the cold air by 20°c. determine the system’s thermal efficiency. assume isentropic operations for all compressor and the turbine stages and use constant specific heats at room temperature. (0.378)