How are static electricity and current electricity alike and different?

Which of the following statements are evidence that gases do not always behave ideally? check all that apply.? a. co2 gas becomes dry ice (solid co2) at 1 atm and –78.5 °c. b. when two gases are mixed, they follow dalton\'s law of partial pressures. c. at 4 k and 1 atm, helium is a liquid. d. it is impossible to compress a gas enough so that it takes up no volume.

Provides most of the energy used in the world today. question 4 options: wind fossil fuel moving water sunlight

What does the negative sign in f = –kx mean?