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crimeas [40]
3 years ago
9

A motor uses the attracting and repelling forces of magnets to create rotational motion. What type of energy results from this p

rocess?
A) nuclear
B) mechanical
C) electrical
D) gravitational
Chemistry
2 answers:
zavuch27 [327]3 years ago
7 0

b) Mechanical

:D Hope it helps!










zalisa [80]3 years ago
4 0

Answer:

<h2>B) mechanical</h2>

Explanation:

<em>The mechanical energy of a body or a whole physical system is basically the sum of kinetic energy and potenital energy. </em>Basically, you can defined it as the energy responsible for movements, because potential energy depends on the position and kinetic energy on the velocity, and both follow the conservation of energy law, which means the exchange one another to develop movement.

Therefore, the right answer is B) mechanical. A motor uses the attracting and repelling forces of magnets to create rotational motion, which result in mechanical energy.

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How is it possible for water to be polar but uncharged?
kaheart [24]
Water is polar in that the hydrogen atoms bear a partial positive charge, whereas the oxygen atom bears a partial negative charge, due to the electronegativity of oxygen. ... Water disrupts ionic bonds and hydrogen bonds.
3 0
3 years ago
You stir a cup of hot chocolate with a spoon. Why does the spoon keep its shape in the drink?
luda_lava [24]

a because the spoon is a solid and the hot chocolate is a liquid.So that means that spoon moves slower than a liquid.


                                                                                                        

6 0
4 years ago
Read 2 more answers
A 283.3-g sample of X2(g) has a volume of 30 L at 3.2 atm and 27 'C. What is element X?
professor190 [17]

we find the number of moles with the formula

pV=nRT

27C=300k

3.2*30=n*0.082*300

n=96/24.6=3.9 moles

we have the mass ant the number of moles so we can calculate the molar mass

283.3/3.9=72.64g/moles

that means X's mass is 72.64/2=36.3 so the element is Kr(Kriptonium)

4 0
3 years ago
Starting at atmospheric pressure, by how much must the pressure change in order to lower the boiling point of water by 1° C? You
Marina86 [1]

Answer:

ΔP = -3556.36 Pa

Explanation:

Atmospheric pressure, P = 101300 Pa

Latent heat of boiling water, L_{B} = 2.256 * 10^{6} J/kg

Boiling point at atmospheric pressure, T = 373.15 K

ΔT = 1 K

The change in volume as the water boils to vapor will be

\triangle V = V_{v} - V_{l}

Since the volume of vapor (V_{v}) is far greater than the volume of liquid (V_{l})

\triangle V = V_{v}

Using the ideal gas equation:

PV_{v} = RT\\V_{v} = RT/P

R = 8.314 J/mol-K

V_{v} = \frac{8.314 * 373.15}{101300} \\V_{v} = 0.0306 m^{3}

ΔV = 0.0306 m³

Molecular weight of water, MW = 0.018 kg/mol

Using the Clausius - Clapeyron equation:

\triangle P = \frac{L_B \triangle T}{T \triangle V}* MW\\\triangle P = \frac{2.256 * 10^{6}  *1}{373.15* 0.0306}* 0.018

ΔP = -3556.36 Pa

But the pressure change is said to lower the boiling point of water, only a negative pressure change will lower the boiling point.

ΔP = 3556.36 Pa

4 0
3 years ago
Explain how to count the number of elements in a compound.
Anna35 [415]

Answer:

Simply identify what elements are in a compound

Explanation:

For example in NaCl we have sodium (Na) and Chlorine (Cl)

In order to do this you would need to recognise the symbols for a certain element: O for oxygen; N for nitrogen; H for hydrogen etc.

3 0
3 years ago
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