What makes electricity? Is it the heat or friction or? If voltage is the speed of electrons passing and you measure the speed, how do you measure current? Because doesn't the length o the conductor like decides how many electrons there are? Because the electrons enters AND leaves the conductor?

Aweight lifter raises a 1600 n barbell to a height of 2.0 meters. how much work was done? w = fd a) 30 joules b) 3000 joules c) 320 joules d) 3200 joules

If water vapor with the mass of 35.0 grams is cooled and condensed into water in a closed system such as a closed glass jar, what is the mass of the water after the water vapor completely condenses? a) 34.5 grams b) 35.0 grams c) 35.5 grams d) the mass cannot be determined without knowing the volume

Language is not the only way that humans communicate. describe how we use sound, touch, chemicals, and sight to communicate. need answer asap