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3 years ago

How can an object travel 6 meters if it ends up at -2 on the number line?)

1 answer:

3 0

Answer: Distance is a scalar quantity and direction is not applicable. We can use graphs to depict an object's change in position over time. Create a large number line in the classroom by taping index cards on the floor or wall 1 meter apart.

Explanation: I really hope that was helpful.

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A 1-m-tall barrel is closed on top except for a thin pipe extending 4.2 m up from the top. When the barrel is filled with water

Dmitry_Shevchenko [17]

Answer:

P = 52 kPa

Explanation:

Hidrostatic pressure is defined as the product of the height of liquid (h) by its specific weight (ρ) and by the acceleration of gravity (g).

In the first scenario, the atmospheric pressure is:

$10,000 = \rho g h_{1}\\10,000 = \rho g*1\\\rho g = 10,000$

In the second scenario, h = 4.2 + 1 m. Therefore, the pressure at the bottom of the barrel is:

$P= \rho g h_{2}\\P= 10,000*5.2\\P=52,000\\P=52kPa$

The pressure on the bottom when water is added to fill the pipe to its top is 52 kPa.

4 0

3 years ago

A 100-mm pipe is used to transfer oil from a reservoir to a 100- liter tank. It takes 45 minutes to fill the tank with oil that

Firlakuza [10]

Explanation:

Given that,

Diameter =100 mm

Volume = 100 liter

Time = 45 min

Viscosity = 0.005 Pas

Density = 900 kg/m³

(a). We need to calculate the volume flow rate of oil

Using formula of flow rate

$q=\dfrac{V}{t}$

Put the value into the formula

$Q=\dfrac{0.1}{2700}$

$Q=3.7\times10^{-5}\ m^3/s$

The volume flow rate of oil is $3.7\times10^{-5}\ m^3/s$

(b). We need to calculate the mean velocity in the pipe

Using formula of mean velocity

$v=\dfrac{Q}{A}$

$v=\dfrac{Q}{\dfrac{\pi}{4}\times d^2}$

Put the value into the formula

$v=\dfrac{3.7\times10^{-5}}{\dfrac{\pi}{4}\times(100\times10^{-3})^2}$

$v=4.7\times10^{-3}\ m/s$

The mean velocity in the pipe is $4.7\times10^{-3}\ m/s$ .

(c). We need to calculate the Reynolds number

Using formula of the Reynolds number

$R_{e}=\dfrac{\rho v d}{\mu}$

Put the value in to the formula

$R_{e}=\dfrac{900\times4.7\times10^{-3}\times100\times10^{-3}}{0.005}$

$R_{e}=84.6$

The Reynolds number is 84.6.

(d). We need to calculate the maximum velocity in the pipe

Using formula of maximum velocity

$V_{max}=2v_{avg}$

Put the value into the formula

$v_{max}=2\times4.7\times10^{-3}$

$v_{max}=9.4\times10^{-3}\ m/s$

The maximum velocity in the pipe is $9.4\times10^{-3}\ m/s$

Hence, This is the required solution

7 0

4 years ago

Which describes who will record their measurements in joules?

Aleksandr [31]

Answer: Lily, Astrid, Henry, and Bob

Explanation:

By a small online search i've found the image related to this question, and you can see it below.

Joules is a unit of energy, such that:

Joule = kg*m^2/s^2

In other hand, Watt is a unit of power, such that:

1 W = 1 J/s

Then if we measure power, we are measuring watts, which is equivalent to measuring the total amount of energy in joules in a given period of time, and then dividing that by the time. And if we measure energy, we are directly measuring joules.

Then if we measure power or energy, at some point our measures will be in joules (unless we have an specific device to measure power, but these usually exist for electronic systems, not for mechanical/dinamic systems like the ones in the image), this means that all of them will record their measurements in joules, so the correct option is Lily, Astrid, Henry, and Bob