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2 years ago

Blood has a density of 1.06 She donates 473.176 mL how much mass does she donate

Physics

2 answers:

Tcecarenko [31]2 years ago

7 0

Answer:

the answer is 501.57

Explanation:

Degger [83]2 years ago

3 0

Density = mass / volume

So..

1.06 = mass / 473.176

Multiply 473.176 over to the other side leading to

(1.06)(473.176) = mass

mass = 501.56656 --> 501.57

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Two loudspeakers are located 4.965 m apart on an outdoor stage. A listener is 12.608 m from one and 18.368 m from the other. Dur

leonid [27]

Answer:

Approximately $30.0\; \rm Hz$ .

Explanation:

Look up the speed of sounds in the air at $25\; ^\circ\rm C$ : $v \approx 346\; \rm m \cdot s^{-1}$ .

Let the frequency of this tune be $f\; \rm Hz$ . The wavelength of the tune would be $\displaystyle \lambda = \frac{v}{f} \approx \frac{346}{f}$ .

The distance between the first speaker and the listener is $12.608\; \rm m$ . How many wavelengths can fit into that distance?

$\displaystyle \frac{12.608}{\lambda} \approx \frac{12.608}{346 / f} = \frac{12.608}{346} \cdot f$ .

Similarly, the distance between the second speaker and the listener is $18.368\; \rm m$ . Number of wavelengths in that distance:

$\displaystyle \frac{18.368}{\lambda} \approx \frac{18.368}{346 / f} = \frac{18.368}{346} \cdot f$ .

Difference between these two numbers:

$\begin{aligned} &\frac{18.368}{346} \cdot f - \frac{12.608}{346} \cdot f = \frac{5.76}{346}\cdot f\end{aligned}$ .

For destructive interference to occur, that difference should be equal to $\displaystyle \frac{1}{2}$ , $\displaystyle 1 + \frac{1}{2}= \frac{3}{2}$ , $\cdots$ , or $\displaystyle \left(k+ \frac{1}{2}\right)$ in general ( $k$ can be any non-negative whole number.)

Let $\begin{aligned} \frac{5.76}{346}\cdot f = k + \frac{1}{2}\end{aligned}$ , and solve for $f$ .

$\begin{aligned} f&= \left.\left(k + \frac{1}{2}\right) \right/\frac{5.76}{346}\\ &= \frac{346}{5.76} \, k + \frac{1}{2} \times \frac{346}{5.76} \\ &\approx 60.1\, k + 30.0 \end{aligned}$ .

The next step is to find the values of $k$ that ensure $20 \le f \le 20\times 10^{3}$ (frequency is between $20\; \rm Hz$ and $20\, \rm kHz$ .) It turns out that $k = 0$ (the smallest $k$ value possible) would be sufficient. In that case, the frequency is approximately $30.0\; \rm Hz$ . Using a larger $k$ would only increase the frequency.

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2 years ago

The speed of the current in a river is 6 mph. A ferry operator who works that part of the river is looking to buy a new boat for

user100 [1]

The first step is to determine the rate using the given values. Distance formula 9(x-6)=45 is used where the rate is x-6. Value of x is equivalent to 11. The average speed that covers 45 miles in 9 hours is 5 miles per hour having no current.

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2 years ago

Why was nuclear energy first developed?

Helga [31]

Nuclear energy was not developed. It has existed for as long as time has existed, that is, since the big bang.

The thing that was developed was humans' ability to USE nuclear energy, to do what we want it to do, when we want it to do it.

The reason this was first developed was to bomb the holy beans out of Japan, in order to win World War II.

Today (2020), nine of the world's nations are known to have 14,285 nuclear bombs in storage, for the same general purpose. Seven of these nations are storing 1,170 of these bombs (about 8 percent), and the USA and Russia have all the rest ... 13,035 nuclear bombs.

All nine of these nations promise that they have no plan to use their bombs, they don't want to use them, it would be wrong and terrible to use them, and they will never be the first to use them, but they need to modernize their bombs so that theirs are better than anybody else's bombs, and they need to keep their bombs for as long as anybody else has any, and then maybe a little longer, just in case.

In the years after the ability to bomb the holy beans out of other people was developed, and enough equipment was built to do it 14 thousand times, the ability to use nuclear energy for other purposes was also developed. It's used now to generate electrical energy, and to do several jobs in Medical science.

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2 years ago

Must physics always be explained by math?

cluponka [151]

Answer:

Because Physics is mainly composited of math

Explanation:

If you really think about it the only way any science works is off maths, whether that be measuring the amount of NaOH to put into a solution or determening the amount of sugar you want in a cake it all relys on maths

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2 years ago

The mass of an electron is...

tester [92]

<span>The mass of an electron is not significant to the overall mass of the atom. (B)

It takes roughly 1,850 electrons to equal the mass of ONE proton or neutron,
but the most complex atom has only around 100 of them.</span>

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2 years ago