The supply of energy and of each needed chemical element restricts a system operation -- for example , without inputs of energy ( sunlight ) and matter ( carbon dioxide and water ) , a plant cannot grow. Hence , it is very informative to track the transfers of matter and energy within , into , or out of any system under study.
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Answer:
1.Ultrasound is a mechanical wave
2.Ultrasounds are sound waves having a frequency above 20,000Hz
3.ltrasound is not included in the electromagnetic spectrum
4.An ultrasound scan uses high-frequency sound waves to create images of the inside of the body
5.Therapeutic ultrasound has no known harmful effects when done right by your therapist
Answer:
Using sold paper is better than to burn it because burning paper may cause pollution.
Explanation:
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Answer:
a)
b)
Explanation:
a) When, wavelength=λ=250 nm
b) When, λ=600 nm
Answer:
Two football players pushing a tackling shed
Explanation:
They're working together to push it. (I also answered this and that was the correct answer)