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3 years ago

14

If the distance between two charges is increased to three times the original distance, how will the electrical force between the

charges compare with the original force?
A) It will increase to three times the original force.
B) It will increase to nine times the original force.
C) It will decrease to one-third the original force.
D) It will decrease to one-ninth the original force.

1 answer:

enot [183]3 years ago

8 0

The electrical force between the charges would: D) It will decrease to one-ninth the original force.

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A closed system consists of 0.3 kmol of octane occupying a volume of 5 m3 . Determine

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Answer:

(a). The weight of the system is 336.32 N.

(b). The molar volume is 16.6 m³/k mol.

The mass based volume is 0.145 m³/kg.

Explanation:

Given that,

Weight of octane = 0.3 kmol

Volume = 5 m³

(a). Molecular mass of octane

$M=114.28\ g/mol$

We need to calculate the mass of octane

Mass of 0.3 k mol of octane is

$M=114.28\times0.3\times1000$

$M=34.284\ kg$

We need to calculate the weight of the system

Using formula of weight

$W=mg$

Put the value into the formula

$W=34.284\times9.81$

$W=336.32\ N$

(b). We need to calculate the molar volume

Using formula of molar volume

$\text{molar volume}=\dfrac{volume}{volume of moles}$

Put the value into the formula

$\text{molar volume}=\dfrac{5}{0.3}$

$\text{molar volume}=16.6\ m^3/k mol$

We need to calculate the mass based volume

Using formula of mass based volume

$\text{mass based volume}=\dfrac{volume}{mass}$

Put the value into the formula

$\text{mass based volume}=\dfrac{5}{34.284}$

$\text{mass based volume}=0.145\ m^3/kg$

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(b). The molar volume is 16.6 m³/k mol.

The mass based volume is 0.145 m³/kg.

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makvit [3.9K]

To solve this problem we will start by differentiating the values in each of the states of matter. Subsequently through the thermodynamic tables we will look for the values related to the entropy, enthalpy and respective specific volumes. Through the relationship of Power defined as the product between mass and enthalpy and mass, specific volume and pressure, we will find the energetic values in the two states investigated. We will start defining the states

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$T_1 = 700\°C$

$P_1 = 4 Mpa$

From steam table

$h_1 =3906.41 KJ/Kg$

$s_1 = 7.62 KJ/Kg.K$

Now

$s_1 = s_2 = 7.62 KJ/Kg.K$ <em>As 1-2 is isentropic</em>

State 2

$P_2 = 20 Kpa$

$s_2 = 7.62 KJ/Kg \cdot K$

From steam table

$h_2 = 2513.33 KJ/Kg$

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Answer:

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A hypothesis is an explanation for those facts and can expierimented on.

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