Which of the following statements is true? 1. Energy can be created, but not destroyed.
2. Some machines are 100 percent efficient.
3. Atomic energy can't be converted into electricity.
4. When work is done, some energy is always "lost" as heat.

If you had a chance to change the past would you? why or why not?

Which evidence supports the inference that nora is afraid of what torvald will say if krogstad tells him about her forgery? do it for my sake—for your own sake—for the children's sake." "you don't know what that letter can bring upon us." "yes, it's too late." "you will never have to do that."

Could someone me with this question?