Imagine a ringing bell set inside a sealed glass jar. once all the air is removed and a vacuum is crated, the ringing sound is no longer heard. explain why this happens. a. the lack of air in the jar causes the ringing to stop. b. without air, the sound waves cannot travel to the ear. c. the glass prevents any sound from scraping. d. the pressure of outside air causes the sound to remain within the jar.

What kind of simple machine is a catapult?

Visualize the problem and identify special cases first examine the problem by drawing a picture and visualizing the motion. apply newton's 2nd law, ∑f⃗ =ma⃗ , to each body in your mind. don't worry about which quantities are given. think about the forces on each body: how are these consistent with the direction of the acceleration for that body? can you think of any special cases that you can solve quickly now and use to test your understanding later? one special case in this problem is if m2=0, in which case block 1 would simply fall freely under the acceleration of gravity: a⃗ 1=−gj^.

The flow of electrons from one atom to another is called