Question

define 'health'





'Health' does not mean free from sick and diseases Health is comprehensive term for the complete will being of body and mind.​

Answer 1

Answer:

SECTION LEARNING OBJECTIVES

By the end of this section, you will be able to do the following:

Describe resonance and beats

Define fundamental frequency and harmonic series

Contrast an open-pipe and closed-pipe resonator

Solve problems involving harmonic series and beat frequency

Section Key Terms

beat beat frequency damping fundamental harmonics

natural frequency overtones resonance resonate

Resonance and Beats

Sit in front of a piano sometime and sing a loud brief note at it while pushing down on the sustain pedal. It will sing the same note back at you—the strings that have the same frequencies as your voice, are resonating in response to the forces from the sound waves that you sent to them. This is a good example of the fact that objects—in this case, piano strings—can be forced to oscillate but oscillate best at their natural frequency.

A driving force (such as your voice in the example) puts energy into a system at a certain frequency, which is not necessarily the same as the natural frequency of the system. Over time the energy dissipates, and the amplitude gradually reduces to zero- this is called damping. The natural frequency is the frequency at which a system would oscillate if there were no driving and no damping force. The phenomenon of driving a system with a frequency equal to its natural frequency is called resonance, and a system being driven at its natural frequency is said to resonate.

Most of us have played with toys where an object bobs up and down on an elastic band, something like the paddle ball suspended from a finger in Figure 14.18. At first you hold your finger steady, and the ball bounces up and down with a small amount of damping. If you move your finger up and down slowly, the ball will follow along without bouncing much on its own. As you increase the frequency at which you move your finger up and down, the ball will respond by oscillating with increasing amplitude. When you drive the ball at its natural frequency, the ball’s oscillations increase in amplitude with each oscillation for as long as you drive it. As the driving frequency gets progressively higher than the resonant or natural frequency, the amplitude of the oscillations becomes smaller, until the oscillations nearly disappear and your finger simply moves up and down with little effect on the ball.

A ball bobs up and down with the greatest amplitude when the finger drives its oscillation at the fundamental frequency.

Figure 14.18 The paddle ball on its rubber band moves in response to the finger supporting it. If the finger moves with the natural frequency of the ball on the rubber band, then a resonance is achieved, and the amplitude of the ball’s oscillations increases dramatically. At higher and lower driving frequencies, energy is transferred to the ball less efficiently, and it responds with lower-amplitude oscillations.

Another example is that when you tune a

Answer 2

used to express friendly feelings towards one's companions before drinking.

used to express friendly feelings towards one's companions before drinking.exclamation: your good health; noun: your health; plural noun: your healths; exclamation: your health Health, according to the World Health Organization, is "a state of complete physical, mental and social well-being and not merely the absence of disease and infirmity". A variety of definitions have been used for different purposes over time. The World Health Organization (WHO) defines health as 'a state of complete physical, mental and social wellbeing and not merely the absence of disease or infirmity'. generally accepted definition states that “health is a state of complete physical, mental, and social well-being and not merely the absence of disease or infirmity”

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