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SIZIF [17.4K]
3 years ago
8

Yami pours powdered cocoa mix into milk and stirs it. Then she microwaves the mixture for three minutes. When she takes the cup

out, the handle is very warm. Steam rises from the cup, so she blows it before taking a sip. In which part of this scenario can convection be best observed?
A)stirring powdered cocoa mix into milk
B)touching the warm handle of the cup
C)rising steam from the cup of cocoa
D)blowing on the hot cocoa to cool it
Physics
2 answers:
Sati [7]3 years ago
6 0

Answer: C

rising steam from the cup of cocoa

vaieri [72.5K]3 years ago
5 0

Answer: Option (C) is the correct answer.

Explanation:

When a fluid is heated then then hot liquid (less dense) rises and cool liquid (more dense) sinks at the bottom and this process is known as convection.

For example, when cocoa mix is poured into milk and heated in an oven then molecules of milk and cocoa inter change their position due to heating and cocoa mixes into the milk.

And steam (less dense) rises at the top and cool cocoa (more dense) sinks at the bottom.

Thus, we can conclude that rising steam from the cup of cocoa is a part of this scenario in which convection can be best observed.

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What percentage of the original kinetic energy is convertible to internal energy?
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7 0
3 years ago
A sample of helium has a volume of 12.7 m3. The temperature is raised to 323 K at which time the gas occupies 32.5 m3? Assume pr
jasenka [17]

Answer: The original temperature was

T_{1}=126.51K

Explanation:

Let's put the information in mathematical form:

V_{1}=12.7m^{3}

T_{1}=?

V_{2}=32.5m^{3}

T_{2}=323K

P_{1}=P_{2}=3atm

If we consider the helium as an ideal gas, we can use the Ideal Gas Law:

PV=nRT

were <em>R</em> is the gas constant. And <em>n</em> is the number of moles (which we don't know yet)

From this, taking R=0.08205746\frac{atm.l}{mol.K},  we have:

n=\frac{P_{2}V_{2}}{RT_{2}}

⇒n=3.67mol

Now:

T_{1}=\frac{P_{1}V_{1}}{nR}

⇒T_{1}=126.51K

7 0
3 years ago
Read 2 more answers
Select all of the answers that apply.
Svetllana [295]
Researchers found the "cosmic microwave background radiation", which is a heat imprint left over from the big bang.

The redshift of light emitted by most galaxies indicates the universe is expanding.

5 0
3 years ago
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A student witnesses a flash of lightning and then t=2.5s later the student hears assiciated clap of thunder. (please show work)
frosja888 [35]

Answer:

857.5 m

2.8583×10⁻⁶ seconds

Explanation:

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Distance travelled by the sound = Time taken by the sound × Speed of sound in air

⇒Distance travelled by the sound = 2.5×343 = 857.5 m

⇒Distance travelled by the sound = 857.5 m

Time taken by light = Distance the light travelled / Speed of light

\text{Time taken by light}=\frac{857.5}{3\times 10^8}\\\Rightarrow  \text{Time taken by light}=2.8583\times 10^{-6}

Time taken by light = 2.8583×10⁻⁶ seconds

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3 years ago
[BWS.02]If the same experiment is repeated in different parts of the world by different scientists,
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Answer:

the results will be the same.it may be

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