Air is made up mostly of O2, N2, and CO2. If the total pressure of air is 765 mmHg and P(n2) = 0.79 atm and P(co2) = 0.05 atm, then what is the partial pressure of O2?

What is the difference between electrically neutral objects and electrically charged objects

An electric clothes dryer has a resistance of 8 ohms. it draws 30 a of current. what is the voltage, in volts, of the wall outlet that it is plugged into?

**urgent** roberto plans to use two transformers to reduce a voltage of 120 v to 4 v. he uses a transformer that has 300 coils in the primary winding and 50 coils in the secondary winding. he has four other transformers, as listed in the table. which transformer should roberto use to have an ending voltage of 4 v? a- w b-xc- yd- z