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sukhopar [10]
3 years ago
11

Four students wrote down their descriptions of burning. Amanda: Buming is a chemical change that happens to food like strawberri

es or apples. Burning happens slower when there is more heat. Krista: Burning is a type of chemical change using fire and heat that produces new substances Buming things like wood or bread changes their color and odo Bernadette: Buming is a type of physical change that changes the color and odor of objects using fire and heat. Laura: Burning is a chemical change where objects change color, odor, and appearance. The lower the heat the faster the chemical change. Which student had the best description of burning? Amanda Krista Bemadette Laura​
Physics
1 answer:
Nuetrik [128]3 years ago
6 0

Answer:

Hey Krista: Burning is a type of chemical change using fire and heat that produces new substances "Buming"* things like wood or bread changes their color and odor

This is the best discription because it describes what things can burn and what happens to them.

*i don't know what "buming" means but i think you mean burning, lol.

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A very rare type of lightning that appears as a reddish-colored sphere is called _____.
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They create enormous amounts of sound energy, much like explosion. When an aircraft passes through air, it creates a series of pressure waves just like the waves created by the boat. As the speed of aircraft increases these waves are forced to compress.

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A lens with f = +11cm is paired with a lens with f = −25cm. What is the focal length of the combination?
Zepler [3.9K]

Answer:

19.642 cm

Explanation:

f₁ = Focal length of first lens = 11 cm

f₂ = Focal length of second lens = -25 cm

Combined focal length formula

\frac{1}{f}=\frac{1}{f_1}+\frac{1}{f_2}\\\Rightarrow \frac{1}{f}=\frac{1}{11}+\frac{1}{-25}\\\Rightarrow \frac{1}{f}=\frac{14}{275}\\\Rightarrow f=\frac{275}{14}\\\Rightarrow f=19.642\ cm

Combined focal length is 19.642 cm

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3 years ago
. An experimental rocket plane lands on skids on a dry lake bed. If it’s traveling at 80.0 m/s when it touches down, how far doe
kobusy [5.1K]

Answer:

1. A substance that can be separated into two or more substances only by a chemical change is a(n) _____.

solution

element

mixture

compound

2.

Which of the following materials is a substance?

air

gasoline

stainless steel

silver

3.

The first figure in a properly written chemical symbol always is _____.

boldfaced

capitalized

italicized

underlined

4.

Which of the following represents a compound?

H

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5. What do chemical symbols and formulas represent, respectively?

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Explanation:

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2 years ago
With what type of electromagnetic radiation would you observe:
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Answer:

Green part of the visible spectrum.

X ray part of the electromagnetic spectrum.

Infrared part of the electromagnetic spectrum.

Explanation:

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\lambda_{max}=\frac{b}{T}

Where, b = Wien's displacement constant = 2.898×10⁻³ mK

T = Temperature in kelvin

\lambda_{max}=\frac{2.898\times 10^{-3}}{5800}\\\Rightarrow\lambda_{max}=0.499\times 10^{-6}=0.5\mu m=500\ nm

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So, the wavelength would be of around the X ray part of the electromagnetic spectrum.

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