Which of the following is/are true about magnetic field lines? * Points away from the south pole and toward the north pole

Uniformly intersect other magnetic field lines

They present the direction and not the force of the magnetic field

They represent the strength of the magnetic field

All of the above

None of the above​

In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j? 1. write the equation 2.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