What causes an electric current in a wire?

a) electrons move because of heat
b) electrons build up in the wire and create a charge
c) electric fields cause atoms to move in the wire
d) electrons flow because of electrical attraction and repulsion

you : 3

What are the percent by mass of copper in penny lab

24. a sports ball is inflated to an internal pressure of 1.85 atm at room temperature (25 °c). if the ball is then played with outside where the temperature is 7.5 °c, what will be the new pressure of the ball? assume the ball does not change in volume nor does any air leak from the ball a) 0.555 atm b) 1.74 atm c) 1.85 atm d) 1.97 atm

Which of the following are sources of revenue for media companies? a. direct sales to producers b.advertising and subscriptions c. online purchase d. capital investments