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the first law of thermodynamics states that △e = q-w. is this also a statement of the principle of conversation of energy?
a. the heat that flows into the system is transformed into work and a change in internal energy
b. the energy that flows into the system is transformed into heat and work
c. the work that is done by the piston is transformed into heat and a change in internal energy
d. a change in internal energy causes work to be done and heat to flow into the system

Copper has free electrons per cubic meter. a 71.0-cm length of 12-gauge copper wire that is 2.05 mm in diameter carries 4.85 a of current. (a) how much time does it take for an electron to travel the length of the wire? (b) repeat part (a) for 6-gauge copper wire (diameter 4.12 mm) of the same length that carries the same current. (c) generally speaking, how does changing the diameter of a wire that carries a given amount of current affect the drift velocity of the electrons in the wire?

How many dots must be added to the symbol to properly represent a standard nitrogen ion? a) 1 b) 3 c) 5 d) 8

If the force applied to an object remains constant, is more power needed for the object to move faster ? explain