How much work, in kj, can a spring whose spring constant is 4 kn/cm produce after it has been compressed 3 cm from its unloaded length?

What will a positive and a negative charge do if they are separated from each other?

Which of these metals are magnetic?

Which best describes the first law of thermodynamics as compared to the second law of thermodynamics? a. the first law describes how thermal energy is conserved but not the direction it moves. b. the first law describes the direction thermal energy moves but not how it is conserved. c. the first law describes how thermal energy can be created but not how it can be destroyed. d. the first law describes how thermal energy can be destroyed but not how it can be created.