How do convection currents form in air?

Why does the moon have a layer of powdery "soil" on its surface?

The human ear is most sensitive to the sounds in what range? 1. 500 to 1500 Hz 2. 500 to 1500 s 3. 4000 to 5000 Hz 4. 5000 to 10000 s 5. 10000 to 20000 Hz 6. 2000 to 3000 s 7. 5000 to 10000 Hz 8. 2000 to 3000 Hz 9. 4000 to 5000 s 10. 100 to 250 Hz

Explain why the liquids in a salad dressing bottle settled back into the same order after they were shaken up.

Which of the following states that absolute zero cannot be reached A. the first law of thermodynamics B. the second law of thermodynamics C. the third law of thermodynamics D. the second and third laws of thermodynamics

In the parallel spring system, the springs are positioned so that the 37 N weight stretches each spring equally. The spring constant for the left-hand spring is 2.7 N/cm and the spring constant for the righ-hand spring is 4.3 N/cm.

Sound waves travel the fastest through which of the following? A. cold gas B. hot gas C. Hot vacuum D. Cold vacuum

According to the kinetic-molecular theory, gases condense into liquids because of

What does sound travel throu better

How does a change in resistance affect the conductivity of a material? A) The lower the resistance, the worse the conductivity B) The lower the resistance, the better the conductivity C) The higher the resistance, the better the conductivity D) The

Two railroad cars, each of mass 6500 kg and traveling 80 km/h in opposite directions, collide head-on and come to rest. how much thermal energy is produced in this collision?