If a water wave completes one cycle in 2 seconds, what is the period of the wave?

a. 0.5 seconds
b. 4 seconds
c. 2 seconds
d. 0.2 seconds

The first law of thermodynamics states that heat added to a system is neither created nor destroyed but is transformed ⇒ as it changes into other forms of energy.

You've already seen the value of 9.8 in this lesson. what's this value called? what quantity does it represent?

As the distance from a magnet increases, what happens to the magnet force?