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Salsk061 [2.6K]
3 years ago
11

A scientific model is based on assumptions that limit where and how the model can be applied. True False​

Physics
1 answer:
belka [17]3 years ago
6 0

Answer:

i think it is true

Explanation:

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What is the pathway of air into the body
ipn [44]

Answer:

Respiratory System

Explanation:

5 0
3 years ago
Read 2 more answers
The temperature at the surface of the Sun is approximately 5,300 K, and the temperature at the surface of the Earth is approxima
N76 [4]

Answer:

The entropy change of the Universe that occurs is 19.346 J/K

Explanation:

Given;

temperature of the sun, T_s = 5,300 K

temperature of the Earth, T_E = 293 K

radiation energy transferred by the sun to the earth, E = 6000 J

The sun loses Q of heat and therefore decreases its entropy by the amount

\delta S_{sun} = \frac{-Q}{T_s}

The earth gains Q of heat and therefore increases its entropy by the amount

\delta S_{Earth} = \frac{-Q}{T_E}

The total entropy change is:

\delta S_{Earth} + \delta S_{sun} = \frac{Q}{T_E} -\frac{Q}{T_S} \\\\                                                      = Q(\frac{1}{T_E} -\frac{1}{T_S} )\\\\= 6000(\frac{1}{293} -\frac{1}{5300} )\\\\=6000(0.0032243)\\\\= 19.346 \ J/K

Therefore, the entropy change of the Universe that occurs is 19.346 J/K

4 0
3 years ago
Why do electrons rather than protons make up the flow of charge in a metal wire?
andrew-mc [135]
Protons are tightly bound to the nucleus of atoms, and the nucleus is
'shielded' from the outside world by the 'cloud' of electrons around it. 
It takes a lot of energy to separate a proton from the nucleus.  When
that happens, it's a 'radioactive' or a 'nuclear' event, and the atom has
changed into an atom of a different substance.  This isn't something
that's happening around us very often.

On the other hand, the electrons are on the outside of the atom, and
it's rather easy to convince an electron to leave its atom and flow off
to somewhere else.
6 0
3 years ago
Two parallel square metal plates that are 1.5 cm and 22 cm on each side carry equal but opposite charges uniformly spread out ov
Mumz [18]

Answer:

The number of excess electrons are on the negative surface is 4.80\times10^{10}\ electrons

Explanation:

Given that,

Distance =1.5 cm

Side = 22 cm

Electric field = 18000 N/C

We need to calculate the capacitance in the metal plates

Using formula of capacitance

C=\dfrac{\epsilon_{0}A}{d}

Put the value into the formula

C=\dfrac{8.85\times10^{-12}\times(22\times10^{-2})^2}{1.5\times10^{-2}}

C=0.285\times10^{-10}\ F

We need to calculate the potential

Using formula of potential

V=Ed

Put the value into the formula

V=18000\times1.5\times10^{-2}\ V

V=270\ V

We need to calculate the charge

Using formula of charge

Q=CV

Put the value into the formula

Q=0.285\times10^{-10}\times270

Q=76.95\times10^{-10}\ C

Here, the charge on both the positive and negative  plates

Q=+76.95\times10^{-10}\ C

Q=-76.95\times10^{-10}\ C

We need to calculate the number of excess electrons are on the negative surface

Using formula of number of electrons

n=\dfrac{q}{e}

Put the value into the formula

n=\dfrac{76.95\times10^{-10}}{1.6\times10^{-19}}

n=4.80\times10^{10}\ electrons

Hence, The number of excess electrons are on the negative surface is 4.80\times10^{10}\ electrons

8 0
3 years ago
What property of matter do we consider when deciding whether to buy a half-gallon of milk at the store versus a gallon of milk?
Mrac [35]
Liquified matter maybe.
7 0
3 years ago
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