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Ghella [55]
3 years ago
14

18

Engineering
1 answer:
svp [43]3 years ago
5 0

Answer:

серйозних порушень точності,

∵∴⊕∴∵

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Three groups of students are given study outlines for 6 weeks. One group studies 2 hours a night, a second group studies 1 hour
katrin2010 [14]

Answer:

The constant here is the study outline

Explanation:

In scientific research, the constant variable is that part/variable of the experiment that does not change or is set not to change. Examples include temperature, environment or height.

Assuming the scenery described in this question is an experiment. All the groups presented are bound by a constant during the experiment. The constant here is the study outline. The study outline provided to the students is not going to change.

NOTE: There could be confusion as regards the answer being the final exam grade but that will be the dependent variable as that will be the outcome of the experiment while the time spent to study will be the independent variable.

8 0
3 years ago
H2O enters a conical nozzle, operates at a steady state, at 2 MPa, 300 oC, with the inlet velocity 30 m/s and the mass flow rate
Colt1911 [192]

Answer:

The flow velocity at outlet is approximately 37.823 meters per second.

The inlet radius of the nozzle is approximately 0.258 meters.

Explanation:

A conical nozzle is a steady state device used to increase the velocity of a fluid at the expense of pressure. By First Law of Thermodynamics, we have the energy balance of the nozzle:

Energy Balance

\dot m \cdot \left[\left(h_{in}+\frac{v_{in}^{2}}{2} \right)-\left(h_{out}+\frac{v_{out}^{2}}{2} \right)\right]= 0 (1)

Where:

\dot m - Mass flow, in kilograms per second.

h_{in}, h_{out} - Specific enthalpies at inlet and outlet, in kilojoules per second.

v_{in}, v_{out} - Flow speed at inlet and outlet, in meters per second.

It is recommended to use water in the form of superheated steam to avoid the appearing of corrosion issues on the nozzle. From Property Charts of water we find the missing specific enthalpies:

Inlet (Superheated steam)

p = 2000\,kPa

T = 300\,^{\circ}C

h_{in} = 3024.2\,\frac{kJ}{kg}

\nu_{in} = 0.12551\,\frac{m^{3}}{kg}

Where \nu_{in} is the specific volume of water at inlet, in cubic meters per kilogram.  

Outlet (Superheated steam)

p = 600\,kPa

T = 160\,^{\circ}C

h_{out} = 2758.9\,\frac{kJ}{kg}

If we know that \dot m = 50\,\frac{kJ}{kg}, h_{in} = 3024.2\,\frac{kJ}{kg}, h_{out} = 2758.9\,\frac{kJ}{kg} and v_{in} = 30\,\frac{m}{s}, then the flow speed at outlet is:

35765-25\cdot v_{out}^{2} = 0 (2)

v_{out} \approx 37.823\,\frac{m}{s}

The flow velocity at outlet is approximately 37.823 meters per second.

The mass flow is related to the inlet radius (r_{in}), in meters, by this expression:

\dot m = \frac{\pi \cdot v_{in}\cdot r_{in}^{2} }{\nu_{in}} (3)

If we know that \dot m = 50\,\frac{kJ}{kg}, v_{in} = 30\,\frac{m}{s} and \nu_{in} = 0.12551\,\frac{m^{3}}{kg}, then the inlet radius is:

r_{in} = \sqrt{\frac{\dot m\cdot \nu_{in}}{\pi\cdot v_{in}}}

r_{in}\approx 0.258\,m

The inlet radius of the nozzle is approximately 0.258 meters.  

7 0
3 years ago
How to measure the quality of the output signal in ADC?
hodyreva [135]

Answer:

C. Signal-to-quantization-noise ratio

Explanation:

8 0
2 years ago
Silicone elastomers, for use in seals and gaskets, are not compatible with which refrigerants?
s2008m [1.1K]

Answer

Silicone elastomers, for use in seals and gaskets, are not compatible with which refrigerants? answer is HFO'S

Explanation:

3 0
2 years ago
Using Circuit 5.1, answer the following questions. Calculate the voltage across the capacitor, assuming that the circuit has bee
PSYCHO15rus [73]

Complete Question: The complete Question is attached as a file below and the circuit of consideration is contained therein.

Answer:

1) vc(0-) = 6.7 v

2a) vc(0+) = 6.7 v

2b) vc(∞) = 0.825 v

2c) τ = 0.0238775 sec

2d) vc (t) = 0.825 + 5.875 exp(-41.88t) v

e)

vc (τ) = 2.9863 v

vc (2τ) = 1.62 v

vc (3τ) = 1.1175 v

vc (4τ) = 0.9326 v

vc (5τ) = 0.8646 v

vc (6τ) = 0.8396 v

vc (10τ) = 0.8253 v

Explanation:

The circuit analysis and the calculations involved in this question are handwritten and contained in the files attached below.

8 0
3 years ago
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