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3 years ago

What is the formula for finding relative density of a liquid

Physics

1 answer:

egoroff_w [7]3 years ago

8 0

In SI units, the density of water is (approximately) 1000 kg/m3 or 1 g/cm3

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(a) Calculate the number of free electrons per cubic meter for gold assuming that there are 1.5 free electrons per gold atom. Th

KonstantinChe [14]

Answer:

Part A:

$n=8.85*10^{28}m^{-3}$

Part B:

$Electron Mobility=3.03*10^{-3} m^2/V$

Explanation:

Part A:

To calculate the number of free electrons n we use the following formula::

n=1.5N-Au

Where N-Au is number of gold atoms per cubic meter

$N-Au=\frac{Density*Avogadro Number}{atomic weight}$

$Density = 19.32g/cm^3$

$Avogadro Number=6.02*10^{23} atoms/mol$

$Atomic weight=196.97g/mol$

So:

$n=1.5*\frac{Density*Avogadro Number}{atomic weight}$

$n=1.5*\frac{19.32*6.02*10^{23}}{196.97}$

$n=8.85*10^{28}m^{-3}$

Part B:

$Electron Mobility=\frac{Elec-conductivity}{n * charge on electron}$

n is calculated above which is 8.85*10^{28}m^{-3}

Charge on electron=1.602*10^{-19}

Elec- Conductivity= 4.3*10^{7}

$Electron Mobility=\frac{4.3*10^{7}}{ 8.85*10^{28} * 1.602*10^{-19}}$

$Electron Mobility=3.03*10^{-3} m^2/V$

4 0

4 years ago

Which one is made up of one or more molecules?

djverab [1.8K]

Atoms are made up or one or more molecules

8 0

3 years ago

Read 2 more answers

Please solve this asap

brilliants [131]

Let $\vec u$ and $\vec v$ be the vectors, and let $x=\|\vec u\|=\|\vec v\|$ be their common magnitude.

The resultant $\vec u + \vec v$ is $\sqrt 2$ times larger in magnitude than either vector alone, so $\|\vec u+\vec v\| = \sqrt2\,x$ .

Recall the dot product identity

$\vec a \cdot \vec b = \|\vec a\| \|\vec b\| \cos(\theta)$

where $\theta$ is the angle between the vectors $\vec a$ and $\vec b$ . In the special case of $\vec a=\vec b$ , we get

$\vec a \cdot \vec a = \|\vec a\|^2 \cos(0^\circ) \implies \|\vec a\| = \sqrt{\vec a\cdot\vec a}$

Now, to get the angle between $\vec u$ and $\vec v$ , we have

$\vec u \cdot \vec v = \|\vec u\| \|\vec v\| \cos(\theta) \implies \cos(\theta) = \dfrac{\vec u \cdot \vec v}{x^2}$

To compute the dot product, we take the dot product of the resultant with itself.

$(\vec u+\vec v) \cdot (\vec u + \vec v) = \|\vec u + \vec v\|^2$

Solve for $\vec u\cdot\vec v$ .

$(\vec u\cdot\vec u) + 2(\vec u\cdot\vec v) + (\vec v\cdot\vec v) = \|\vec u + \vec v\|^2$

$\|\vec u\|^2 + 2(\vec u\cdot \vec v) + \|\vec v\|^2 = \|\vec u+\vec v\|^2$

$x^2 + 2(\vec u \cdot \vec v) + x^2 = (\sqrt2\,x)^2$

$2(\vec u\cdot\vec v) + 2x^2 = 2x^2$

$2(\vec u\cdot\vec v) = 0$

$\vec u\cdot\vec v = 0$

Since their dot product is zero, $\vec u$ and $\vec v$ are perpendicular, so $\theta=90^\circ$ .

7 0

2 years ago

Name and explain the<br> various types of friction.

yawa3891 [41]

Answer:

There are four types of friction: static, sliding, rolling, and fluid friction. Static, sliding, and rolling friction occur between solid surfaces. Static friction is strongest, followed by sliding friction, and then rolling friction, which is weakest. Fluid friction occurs in fluids, which are liquids or gases.

Explanation:

8 0

3 years ago

What is the definition of a parasite?

saul85 [17]

An organism that lives in or on an organism of another species (its host) and benefits by deriving nutrients at the other's expense.

7 0

4 years ago