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3 years ago

Which of the following statements about stress management is TRUE?

Physics

2 answers:

ivolga24 [154]3 years ago

7 0

Answer:

Explanation:

Basically all the other answer are opposites like Exercise is an effective way to relieve stress and lots of Stress does have Negative effects on people

Stella [2.4K]3 years ago

4 0

Answer:

Explanation:

edge 2020

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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

3 years ago

Match these terms with their definitions.

adoni [48]

The correct matches are as follows:

1. measure of disorder
entropy

2. the study of energy conversions
thermodynamics

3. conservation of energy when heat is added
second law of thermodynamics

4. disorder increasing
the kinetic and potential energy of the molecules of a substance

5. reaching a state of total disorder
maximum entropy 

6. internal energy
first law of thermodynamics

7 0

3 years ago

Read 2 more answers

A car travels for 10s at a steady speed of 20m/s along a straight road. A traffic light changes to red, and the car slows down w

pshichka [43]

Answer:

cvdQ

Explanation:

8 0

2 years ago

Given vectors D (3.00 m, 315 degrees wrt x-axis) and E (4.50 m, 53.0 degrees wrt x-axis), find the resultant R= D + E. (a) Write

Eva8 [605]

Answer:

R = ( 4.831 m , 1.469 m )

Magnitude of R = 5.049 m

Direction of R relative to the x axis= 16°54'33'

Explanation:

Knowing the magnitude and directions relative to the x axis, we can find the Cartesian representation of the vectors using the formula

$\vec{A}= | \vec{A} | \ ( \ cos(\theta) \ , \ sin (\theta) \ )$

where $| \vec{A} |$ its the magnitude and θ.

So, for our vectors, we will have:

$\vec{D}= 3.00 m \ ( \ cos(315) \ , \ sin (315) \ )$

$\vec{D}= ( 2.121 m , -2.121 m )$

and

$\vec{E}= 4.50 m \ ( \ cos(53.0) \ , \ sin (53.0) \ )$

$\vec{E}= ( 2.71 m , 3.59 m )$

Now, we can take the sum of the vectors

$\vec{R} = \vec{D} + \vec{E}$

$\vec{R} = ( 2.121 \ m , -2.121 \ m ) + ( 2.71 \ m , 3.59 \ m )$

$\vec{R} = ( 2.121 \ m + 2.71 \ m , -2.121 \ m + 3.59 \ m )$

$\vec{R} = ( 4.831 \ m , 1.469 \ m )$

This is R in Cartesian representation, now, to find the magnitude we can use the Pythagorean theorem

$|\vec{R}| = \sqrt{R_x^2 + R_y^2}$

$|\vec{R}| = \sqrt{(4.831 m)^2 + (1.469 m)^2}$

$|\vec{R}| = \sqrt{23.338 m^2 + 2.158 m^2}$

$|\vec{R}| = \sqrt{25.496 m^2}$

$|\vec{R}| = 5.049 m$

To find the direction, we can use

$\theta = arctan(\frac{R_y}{R_x})$

$\theta = arctan(\frac{1.469 \ m}{4.831 \ m})$

$\theta = arctan(0.304)$

$\theta = 16\°54'33''$

As we are in the first quadrant, this is relative to the x axis.

3 0

3 years ago

Can someone explain the law of conservation of energy?

Bad White [126]

The law of conservation of energy is:

-- Energy can't be created or destroyed.

-- Energy can't just appear out of nowhere. If you suddenly have
more energy, then the 'extra' energy had to come from somewhere.

-- Energy can't just disappear. If you suddenly have less energy,
then the 'missing' energy had to go somewhere.
________________________________________

There are also conservation laws for mass and electric charge.
They say exactly the same thing. Just write 'mass' or 'charge'
in the sentences up above, in place of the word 'energy'.
________________________________________

And now I can tell you that the conservation laws for energy and mass
are actually one single law ... the conservation of mass/energy. That's
because we discovered about 100 years ago that mass can convert
into energy, and energy can convert into mass, and it's the total of BOTH
of them that gets conserved (can't be created or destroyed).

How much mass makes how much energy ?

The answer is E = m c² .

5 0

3 years ago