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3 years ago

What is matter? Give a grade 10/11/12 understanding.

1 answer:

3 0

Matter can be many things, but is mostly made of atoms. Atoms are small things that cannot be seen directly, as lights either passes through it or alters it. However, we know that atoms are made of 3 parts, those being the proton, neutron, and electron.

Protons have a positive electromagnetic charge.

Neutrons have no charge.

Electrons have a negative charge equal to the protons positive charge.

Protons and neutrons make up what's called the nucleus, which is orbited by the electrons.

Protons and neutrons also share another thing in common, that being their composition.

Until relatively recently, we thought that these were the smallest particles in the universe, and indestructible. However, modern discoveries have revealed that they are actually made of quarks and gluons.

These are actually indestructible, being part of the group that is elementary particles.

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Why do you think scientists often find value in looking at and comparing anomalies within data??

Dafna1 [17]

Absolutely, as anomilies can show inconsistencies with data and hypothesis they may have and may actually assist in refining the accuracyof their ideas by not only encompassing the most commonly-occuring phenomena, but also the more seldom occuring scenarios as well.

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3 years ago

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A car slows down from 65 km/s to 30 km/s in 5 seconds. What is its acceleration?

AveGali [126]

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3 years ago

What is voltage and current?

MrMuchimi

Voltage - An electromotive force or potential difference expressed in volts.

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3 years ago

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Suppose that you lift four boxes individually, each at a constant velocity. The boxes have weights of 18 N, 6.0 N, 9.0 N, and 12

cricket20 [7]

Explanation:

It is known that the relation between work and force is as follows.

w = $F \times d cos (\theta)$

where, $\theta$ = angle between the applied force and direction of movement of the object which is zero in this case. As, cos (0) = 1.

Therefore, d = $\frac{w}{F}$

(i) For w = 36 J, and F = 9 N then value of d will be as follows.

d = $\frac{w}{F}$

= $\frac{36 J}{9 N}$

= 4 m

(ii) For w = 36 J, and F = 12 N then value of d will be as follows.

d = $\frac{w}{F}$

= $\frac{36 J}{12 N}$

= 3 m

(iii) For w = 36 J, and F = 6 N then value of d will be as follows.

d = $\frac{w}{F}$

= $\frac{36 J}{6 N}$

= 6 m

(iv) For w = 36 J, and F = 18 N then value of d will be as follows.

d = $\frac{w}{F}$

= $\frac{36 J}{18 N}$

= 2 m

4 0

3 years ago

Uranium was used to generate electricity in a nuclear reactor of a nuclear power station. The nuclear reactor was 29% efficient

Minchanka [31]

Answer:

$C_{lifetime} = 2,618,017,174\,USD$

Explanation:

The energy contained per second in the fuel is:

$\dot E_{fuel} = \frac{800\times 10^{6}\,W}{0.29}$

$\dot E_{fuel} = 2.758\times 10^{9}\,W$

It is know that fission of a gram of uranium liberates $5.8\times 10^{8}\,J$ . Mass flow rate is computed herein:

$\dot m_{U}= \frac{2.758\times 10^{9}\,W}{5.8\times 10^{8}\,\frac{J}{g}}$

$\dot m_{U} = 4.755\,\frac{g}{s}$

The needed quantity of fuel per second is:

$\dot m_{fuel} = \frac{4.755\,\frac{g}{s} }{0.04}$

$\dot m_{fuel} = 118.875\,\frac{g}{s}$

The annual fuel consumption is now obtained:

$\Delta m_{fuel,year} = (0.119\,\frac{kg}{s})\cdot (\frac{3600\,s}{1\,h} )\cdot (\frac{24\,h}{1\,day} )\cdot(\frac{365\,days}{1\,year} )$

$\Delta m_{fuel,year} = 3,752,784\,\frac{kg}{year}$

The cost of fuel for the lifetime of the plant is:

$C_{lifetime} = (3,752,784\,\frac{kg}{year} )\cdot (\frac{0.453\,lb}{1\,kg} )\cdot [(20\,years)\cdot(\frac{12\,USD}{1\,lb} )+(20\,years)\cdot (\frac{65\,USD}{1\,lb} )$

$C_{lifetime} = 2,618,017,174\,USD$

6 0

3 years ago