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slavikrds [6]
3 years ago
8

How are changes in energy and matter related

Physics
1 answer:
Svetlanka [38]3 years ago
5 0

Answer:

According to Einstein's famous equation, matter can convert into energy (and viceversa) as follows:

E=mc^2

where

E is the energy

m is the mass

c is the speed of light (3\cdot 10^8 m/s)

Given the huge value of c^2, we see that even a tiny amount of matter is able to release a huge amount of energy, when the whole mass is converted into energy. This is precisely what happens in nuclear reactions. For example, in the process of nuclear fusion (that occurs in the core of the stars), two light nuclei fuse together into a heavier nucleus. The mass of the final nucleus is lower than the total mass of the initial nuclei, so part of the mass has been converted into energy according to the equation above: this is why the amount of energy produced by stars is so big.

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What happens when you want to move the boat forward? You pull the oars toward yourself.Explain why you do this.
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Answer:

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2 years ago
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A 30-mm-diameter copper rod is 1 m long with a yield strength of 70 MPa. Determine the axial force necessary to cause the diamet
ivolga24 [154]

Explanation:

Given data:

d = 30 mm = 0.03 m

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Δd = -0.0001d

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Solution:

O'₂ = Δd/d = (-0.0001d)/d = -0.0001

For copper,

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O'₁ = O'₂/v = (-0.0001)/0.326 = 306×10⁶

∵δ = F.L/E.A    and σ = F/A so,

σ = δ.E/L = O'₁ .E = (306×10⁻⁶).(119×10³) = 36.5 MPa

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S_{y} = 70 MPa > σ = 36.5 MPa

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so the answer is

F = 25800 K N            and     S_{y} > σ

3 0
3 years ago
Amplitude and energy are inversely related, meaning that a high-energy wave has low amplitude and a low-energy wave has high amp
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lukranit [14]

Answer:

an increase in gasses that absorb heat

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