19. What did JJ Thomson add to the model of the atom? a. The Electron Levels b. The Electron Cloud c. The Nucleus d. The Electron

What does temperature measure? the amount of heat the substance has the amount of energy the substance has the change in heat of the particles of a substance the average speed of the particles of a substance

Which type of system allows matter and energy to enter or exit the system? isolated closed open mechanical

Nisha is moving to a new apartment, so she is packing up cardboard boxes and sliding the full boxes across the floor. Use Newton's first and second laws to explain why she finds that the heavy boxes are harder to get moving than the lighter boxes. square

5. Which of these best describes a magnetic field? A. a measure of the length of a magnet B. the force that pushes two magnets away from each other C. an invisible region that surrounds the north pole of a magnet D. a region around a magnet in which magnetic forces can affect magnetic objects

How will high tides differ from their average values when the Moon is in its new phase? A) They will be higher than average. B) They will be lower than average. C) They will not differ from average values significantly. D) There are no high tides when the Moon is new.