Chemical Change A change that produces one or more new substances and may release energy. Chemical Property A second set of properties in all kinds of matter. Circuit A path that is made from an electrical current. Claws A sharp, usually slender, and curved nail on the toe of an animal.
The hourglass was one of the earlier timekeeping devices and has become a symbol of the concept of time. For thousands of years, devices have been used to measure and keep track of time. The current sexagesimal system of time measurement dates to approximately 2000 BC from the Sumerians. The Ancient Egyptians divided the day into two 12-hour periods, and used large obelisks to track the movement of the sun.
Amplitude is a measure of how big the wave is. 1  Imagine a wave in the ocean. 2  It could be a little ripple or a giant tsunami. 3  What you are actually seeing are waves with different amplitudes. 4  They might have the exact same frequency and wavelength, but the amplitudes of the waves can be very different.ince frequency and period are exact inverses of each other, there is a very basic pair of formulas you can use to calculate one if you know the otherâ¦. It is very easy to do these calculations on calculators using the x -1 button. Example 1: The period of a pendulum is 4.5s.