What is the potential difference across one wire of a 40 m extension cord made of 16 gauge copper wire carrying a current of 8 A at room temperature (20degrees Celsius)?

Hydrogen and helium are both members of?

Two objects of different mass start from rest, are pulled by the same magnitude net force, and are moved through the same distance. the work done on object 1 is 900 j. after the force has pulled each object, object 1 moves twice as fast as object 2. how much work is done on object 2?

Give one example to show that when substances are mixed,it may result in a chemical or a physical change depending on the conditions.