Which of the following is a force or motion that is involved in the Moon orbiting Earth?
A. a force pulling the Moon toward the
center
B. a speed at right angles to the line from
the mass of the Moon to the center of
Earth
C. acceleration toward the center of Earth
D. all of the above

How is sound energy produced a. vibrating objects b. objects being heated c. temperature differences d. stationary objects

Heterogeneous mixture with larger particles that never settle is

Jenny wants to test the electrical conductivity of two substances dissolved in water. she is preparing the containers for the experiment. which factor is most important for her to control? a) volumes of the solutions b) appearance of the solutions c) temperatures of the solutions d) concentrations of the solutions