Water is found all three states of matter - solid, liquid, and gas. If you place an ice cube in a pan and melt it to water and then heat it to steam, this is a physical change. Why isn't this a chemical change?
Explanation:
The elemental, chemical makeup of water (that is, Hâ‚‚0) is the same no matter what state of matter it is in.
Since it is not losing or gaining any atoms when it changes states of matter, it is simply a physical change.
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You want to describe the harmonic motion of a swing. You find out that it take 2 seconds for the swing to complete one cycle. The swing passes through 48 degrees as it goes from high point-to-high point in its motion (passing through a center).
a. What is the period of the swing?
b. What is the frequency of the swing in hertz?
c. What is the amplitude of the swing?
Answer:
If it takes the swing 2 seconds to complete one cycle, then
that's the period of its motion ... 2 seconds.
The frequency is the reciprocal of the period ... 1/2 Hz.
('Hz' means 'per second'.)
Explanation:
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