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makvit [3.9K]
3 years ago
6

Suppose a logs mass was 5kg. After burning, the mass of the ash is 1 kg. Explain what may have happened to the other 4kg?

Physics
1 answer:
Helen [10]3 years ago
4 0
Well, we know that mass is conserved, so the missing 4 kg couldn't
just disappear.  It had to go somewhere.

It may have left the burning log in the form of hot gases and smoke particles.
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"In a pure substance all the particles must be identical; therefore pure substances are composed only of elements." Do you agree
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I do not agree with the statement.
The "substance" can be a compound.  It's "pure"
as long as there's nothing else in it but its name.

'Pure' water is 100% H₂O with nothing else in it.
'Pure' table salt is 100% NaCl with nothing else in it.
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These example substances are all compounds, not elements.
 
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An airplane is flying at a constant speed in a positive direction. It slows down when it approaches the airport where it's going to land. this is an example of negative acceleration (D).

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3 years ago
A diatomic molecule is rotating about its center of mass with an angular speed of 3.90 ✕ 10^12 rad/s. Determine the rotational k
Novosadov [1.4K]

Answer:

E_s = 7.35\times 10^{-22}\ J

Explanation:

given,

angular speed, ω = 3.90 x 10¹² rad/s

bond length, L = 1.10 Å

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Rotational Kinetic energy

E_s = \dfrac{1}{2} I \omega^2

now,

moment of inertia ,I = \dfrac{1}{2}MR^2......(1)

mass of O₂ = m

mass of O = M = m/2

now, mass

M = \dfrac{28\times 1.67\times 10^{-27}}{2}

form equation(1)

I = \dfrac{1}{2}\times \dfrac{28\times 1.67\times 10^{-27}}{2}\ R^2

I = \dfrac{1}{2}\times \dfrac{28\times 1.67\times 10^{-27}}{2}\ (1.10\times 10^{-10})^2

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