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enot [183]
3 years ago
5

Please help been stuck on this for a couple minutes

Engineering
1 answer:
AnnyKZ [126]3 years ago
3 0

Answer:

true

Explanation: Fire extinguishers do need water buckets on sand on the other hand sand is also true so that means the awnser is true!

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A roller-coaster car is traveling at a speed of 23 m/s when it passes through point B. At that point, it enters a concave down c
ycow [4]

Answer:

See it in the pic

Explanation:

See it in the pic

8 0
3 years ago
Consider the 'scope trace showing the input signal to an rc filter (the one having the larger amplitude) and the output of the f
yulyashka [42]

The corner frequency of this filter in hz is Directly switched the documents to one-of-a-kind Cloud Multi-Regional Storage bucket places in US, EU, and Asia the usage of APIs over HTTP(S).

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6 0
2 years ago
Estimate the quantity of soil to be excavated from the borrow pit​
Serggg [28]

Answer

1056

Explanation:

for example

A soil is to be excavated from a borrow pit which has a density of 1.75g/cc and water content of 12%. The G is 2.7 the soil is compacted to that water content of 18% and dry density of 1.65g/cc. for 1000 m3 of soil used in fill estimate

Quantity of soil to be excavated from pit in m3

6 0
3 years ago
A well-insulated rigid tank contains 5 kg of a saturated liquid–vapor mixture of water at 200 kPa. Initially, three-quarters of
vlabodo [156]

Answer:

S_{gen} = 18.519\,\frac{kJ}{K}

Explanation:

Given that rigid tank is a closed system, the following model is constructed after the First Law of Thermodynamics:

W_{heater} + U_{sys,1} - U_{sys,2} = 0

W_{heater} = U_{sys,2} - U_{sys,1}

W_{heater} = m\cdot (u_{2}-u_{1})

The entropy generation inside the rigid tank is determined by appropriate application of the Second Law of Thermodynamics:

S_{sys,1} - S_{sys,2} + S_{gen} = 0

S_{gen} = S_{sys,2} - S_{sys,1}

S_{gen} = m\cdot (s_{2}-s_{1})

The properties of the steam are obtained from steam tables:

Intial State

P = 200\,kPa

T = 120.21\,^{\textdegree}C

\nu = 0.2222\,\frac{m^{3}}{kg}

u = 1010.7\,\frac{kJ}{kg}

s = 2.9294\,\frac{kJ}{kg\cdot K}

x = 0.25

Final State

P = 869.567\,kPa

T = 173.88\,^{\textdegree} C

\nu = 0.2222\,\frac{m^{3}}{kg}

u = 2578.6\,\frac{kJ}{kg}

s = 6.6332\,\frac{kJ}{kg\cdot K}

x = 1.00

The entropy change of the steam during the process is:

S_{gen} = (5\,kg)\cdot \left(6.6332\,\frac{kJ}{kg\cdot K} - 2.9294\,\frac{kJ}{kg\cdot K} \right)

S_{gen} = 18.519\,\frac{kJ}{K}

8 0
3 years ago
In crash tests, a shock absorber is used to slow the test car. The shock absorber consists of a piston with small holes that mov
Lesechka [4]

Answer:

The heat transferred to water equals 1600 kJ

Explanation:

By the conservation of energy we have

All the kinetic energy of the moving vehicle is converted into thermal energy

We know that kinetic energy of a object of mass 'm' moving with a speed of 'v' is given by

K.E=\frac{1}{2}mv^{2}

Thus

K.E_{car}=\frac{1}{2}\times 2000\times 40^{2}=1600\times 10^{3}Joules

Thus the heat transferred to water equals 1600kJ

3 0
3 years ago
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