Which choice defines ac and dc correctly?

in ac, electrons moving in one direction. in dc, they move in one direction and then in the other direction.

in dc, electrons move in only one direction. in ac, electrons move in one direction and then in the other direction.

in ac and dc, electrons move in the same direction.

in ac and dc, electrons move in opposite directions.

Choose the most likely outcome of this scenario: jen decided to go bike riding without a helmet. while no one is around during her ride, she is thrown from her bike when her wheel goes into a pothole. she is not injured, but she is terrified to get back on her bike. what happens next? a. her physical health is affected even though she wasn't hurt. b. her mental and emotional health are affected because she is afraid to get back on her bike. c. her social health is affected because she is worried her friends saw the fall. d. her overall health is not affected at all by her fall.

What tightening torque should be used for a hexagonal head screw (not split-bolt) on a 250 kcmil conductor?

10 points! will mark brainiest! in a heat engine if 1,000 j of heat enters the system and the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2,000 j 1: write the equation2: list out your known variables 3: plug the numbers into the equations 4: solve 5: write your solution statement that includes initial energy and final energy added you so much!