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4 years ago

Evidence of a chemical change includes

Physics

1 answer:

NNADVOKAT [17]4 years ago

3 0

Answer:1.- b. Change in color.

It's change in color because the other can happen by via a physical change.

2.- d. A metal is added to an acid and hydrogen gas is formed.

A chemical change results in change of an object chemical structure being disrupted or altered.

Explanation:

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Two thin parallel conducting plates are placed 2.0 cm apart. Each plate is 2.0 cm on a side; one plate carries a net charge of 8

azamat

Gauss's law and charges of the same sign repel allows us to find the results for the questions about the charged plates are:

The charge inside the plates is zero.

The field in the middle of the plates is: E = 2.26 10⁶ N/C

<h3>Gauss's law.</h3>

Gauss's law says that the electric flux through a Gaussian surface is proportional to the charge inside it.

Ф = ∫ E . dA = $\frac{q_{int}}{\epsilon_o }$

where Ф is the flux, E the electric field, A the area, $q_{int}$ the charge inside the surface.

They indicate that we have two metallic plates with a charge of 80 μC = 80 10⁻⁶ C in each one, since the plate is metallic, the electrons are free to move in it and repel each other, therefore the ones that are farthest from each other are placed, this is concentrated on the surface of the metal plate, therefore the charge inside the surface is zero.

Let's use Gauss's law to find the electric field, we define a Gaussian surface with a cylinder base parallel to the plate, in this case the field created by the charge is parallel to the normal of the surface of the plates.

2 E A = $\frac{q_{int}}{\epsilon_o}$

The two comes from the fact that the electric field is emitted towards both sides of the plate.

The charge density on each plate is:

σ = q A

Let's substitute.

E A = $\frac{\sigma A}{2 \ \epsilon_o}$

The electric field is a vector magnitude, so vector addition must be used, see attached for the direction of the electric field.

$R_{total} = E_1+E_2$

$E_{total} = \frac{\sigma}{\epsilon_o}$

Let's calculate.

The charge density.

$\sigma = \frac{q}{l^2}$

$\sigma = \frac{ 80 \ 10^{-6} } { 2.0 \ 2.0}$

σ = 20 10⁻⁶ C

The total electric field.

E = $\frac{20 \ 10^{-6} }{8.85 \ 10^{-12} }$

E = 2.26 10⁶ N/C

In conclusion, using Gauss's law and that charges of the same sign repel each other, we can find the result for the questions about the charged plates:

The charge inside the plates is zero.

The field in the middle of the plates is: E = 2.26 10⁶ N/C

Learn more about Gauss's law here: brainly.com/question/15175106

6 0

3 years ago

A ball has a mass of 4.65kg and approximates a ping pong ball of mass 0.060kg that is at rest by striking it in an elastic colli

Alona [7]

Answer:

Look at work

Explanation:

Elastic Collision: Ki=Kf

M1=4.65kg

M2: 0.060kg

v1=5m/s

v2=0m/s

4.65*5+0.060*0=4.65*v1'+0.060*v2'

23.25+0=4.65v1'+0.060v2'

Also since it is an elastic collision we can use

v1+v1'=v2+v2'

4.65+v1'=v2'

Substitute into the earlier equation

23.25=4.65v1'+0.060(4.65+v1')

Expand

23.25=4.65v1'+0.279+0.06v1'

Solve for v1'

22.971=4.71v1'

v1'=4.88m/s

v2'=4.65+4.88=9.53m/s

7 0

3 years ago

a sound with a constant frequency is produced by the siren on top of a firehouse. Compared to the frequency produced by the sire

polet [3.4K]

There's an effect called The Doppler Effect, that's the "up and down" sound.
That frequency is 1.8mm and 115 per minute.

(Hope this helped.)

3 0

4 years ago

In a mass spectrometer, a compound is first vaporized and converted into ions, which are then separated based on a difference in

Crazy boy [7]

The correct answer is their difference in the charge to mass ratio a mass spectrometer, a compound is first vaporized and converted into ions .

Mass spectrometry is a technique for determining the mass-to-charge ratio (m/z) of one or more molecules in a sample. These measurements are frequently used to calculate the precise molecular weight of the sample components.

The speed at which positively charged ions move through a vacuum chamber toward a negatively charged plate is measured by mass spectrometers. ToF, magnetic sector, and quadrupole mass spectrometers are all commonly used in SIMS instrumentation.The MS/MS has three major advantages: the ability to study numerous molecules regardless of whether they are from the same structural family or not; the ability to highlight the specific metabolites of a disease; and it is an automated technique that allows for large-scale analysis.

Learn more about Mass spectrometry here :-

brainly.com/question/5020187

#SPJ4

8 0

2 years ago

An iron wire has length 8.0m and a diameter 0.50mm. The sir has a resistance R.

Rudik [331]

The re<span>sistance of the second wire is 16 R.
where R is the resistance of the first wire.

R = </span>ρ $\frac{l}{A}$
where l = length of the wire
A = area of the wire
A = $\pi r^{2}$ where, r = $\frac{diameter of wire}{2}$

Thus, on finding the ratio of resistance of the two wires, we get,

$\frac{R1}{R2} = \frac{l1A2}{l2A1}$

here, R1 = R
l1 = 8m
l2 = 2m
A1=π $0.25^{2}$
A1=π $0.50^{2}$

we get. R2 = 16R

7 0

4 years ago