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What are supersonic speeds

Answers

Answer 1

Answer: I think your answer is speed faster than the speed of sound

Answer 2

Answer:

Answer:

speeds above 343 m/s

Explanation:

I have taken the test got 100%

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A piston-cylinder device contains 5 kg of refrigerant-134a at 0.7 MPa and 60°C. The refrigerant is now cooled at constant pressure until it exists as a liquid at 24°C. If the surroundings are at 100 kPa and-24°C, determine: (a) the exergy of the refrigerant at the initial and the final states and
(b) the exergy destroyed during this process.

Answers

A) The exergy of the refrigerant at the initial and final states are :

Initial state = - 135.5285 kJ
Final state = -51.96 kJ

B) The exergy destroyed during this process is : - 1048.4397 kJ

Given data :

Mass ( M ) = 5 kg

P1 = 0.7 Mpa = P2

T1 = 60°C = 333 k

To = 24°C = 297 k

P2 = 100 kPa

A) Determine the exergy at initial and final states

At initial state :

U = 274.01 kJ/Kg , V = 0.034875 m³/kg , S = 1.0256 KJ/kg.k

exergy ( Ф ) at initial state = M ( U + P₂V - T₀S )

= 5 ( 274.01 + 100* 10³ * 0.034875 - 297 * 1.0256)

≈ - 135.5285 kJ

At final state :

U = 84.44 kJ / kg , V = 0.0008261 m³/kg, S = 0.31958 kJ/kg.k

exergy ( ( Ф ) at final state = M ( U + P₂V - T₀S )

= -51.96 kJ

B) Determine the exergy destroyed

exergy destroyed = To * M ( S2 - S1 )

= 297 * 5 ( 0.31958 - 1.0256 )

= - 1048.4397 KJ

Hence we can conclude that A) The exergy of the refrigerant at the initial and final states are : Initial state = - 135.5285 kJ, Final state = -51.96 kJ and The exergy destroyed during this process is : - 1048.4397 kJ

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Final answer:

Exergy of refrigerant-134a at initial and final states is obtained from property tables and by multiplying the mass of the refrigerant with its specific exergy at each state. The difference in exergy between the two states represents the exergy destroyed.

Explanation:

To solve the given question, we need the property values of

refrigerant-134a

at the initial and the final states.

At an initial state of 0.7 MPa and 60°C, the specific exergy for refrigerant-134a can be obtained from property tables which are standard in thermodynamics textbooks. Same for the final state at 0.7 MPa and 24°C, the specific exergy can be obtained from the same property tables.

The exergy of the refrigerant at the initial and the final states can be calculated by multiplying the mass of the refrigerant with its specific exergy at each state.

Exergy destruction during this process can be calculated using the relation between exergy change and exergy destruction. The exergy change of a system between initial and final states is equal to the difference of the exergy of the system at final and initial states.

Based on the second law of thermodynamics, the difference in exergy should be equal to the exergy destroyed during the process.

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Label the longitudinal wave

Answers

Answer:

???

Explanation:

What is the magnitude of the line charge density on the power line? Express your answer using two significant figures.

Answers

Answer:

λ = -47 nC / m

Explanation:

The missing question is as follows:

" The potential difference between the surface of a 2.2 cm -diameter power line and a point 1.9 m distant is 3.8 kV. What is the magnitude of the line charge density on the power line? Express your answer using two significant figures. "

Given:

- The Diameter of the power line D = 2.2 cm

- The distance between two ends of power line L = 1.9m

- The potential difference across two ends V = 3.8 KV

Find:

What is the magnitude of the line charge density on the power line?

Solution:

- The derivation of the line of charges for a length L oriented along any axis centered at origin and the potential difference between two ends is as follows:

V = 2*k*λ*Ln( D / L )

Where,

k : Coulomb's Constant = 8.99*10^9

λ : The line charge density

- Re-arrange and solve for λ:

λ = V / 2*k*Ln( D / L )

Plug in the values:

λ = 3800 / 2*8.99*10^9*Ln( 2.2 / 190 )

λ = -4.74022*10^-8 C / m

λ = -47 nC / m

Final answer:

Line charge density is the total charge distributed along the length of a wire, expressed in coulombs per meter. To calculate it, divide the total charge by the total length of the wire. Without specific numbers for charge and length, a numerical value can't be given.

Explanation:

To calculate the magnitude of the line charge density of a power line, you need to know the total charge (Q) distributed along the total length (L) of the wire. The line charge density (λ) is then defined as λ = Q/L. Unfortunately, without any specific numbers provided for these parameters, I can't provide a numerical answer.

Line charge density is a significant concept in electromagnetism and is measured in coulombs per meter (C/m).

Remember that the charge can be uniform or non-uniform along the length of the line.

For example, if a power line has a total charge of 0.02 C spread along its length of 50 m, it would have a line charge density of λ = Q/L = 0.02 C / 50 m = 0.0004 C/m

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A 0.47 kg block of wood hangs from the ceiling by a string, and a 0.070kg wad of putty is thrown straight upward, striking the bottom of the block with a speed of 5.60 m/s. The wad of putty sticks to the block. (Answer on previous exams) How high does the putty-block system rise above the original position of the block Is the kinetic energy of the system conserved during the collision Is the mechanical energy of the system conserved during the collision Is the mechanical energy conserved after the collision

Answers

Answer:

The height is $h =0.0269 \ m$

The kinetic energy during collision is not conserved

The Mechanical energy during the collision is not conserved

The mechanical energy after the collision is not conserved

Explanation:

From the question we are told that

The mass of the block is $m_b = 0.47\ kg$

The mass of the wad of putty is $m_p = 0.070 \ kg$

The speed o the wad of putty is $v_p = 5.60 \ m/s$

The law of momentum conservation can be mathematically represented as

$p_i = p_f$

Where $p_i$ is the initial momentum which is mathematically represented as

$p_i =m_p * v_p$

While $p_f$ is the initial momentum which is mathematically represented as

$p_f = (m_b + m_p)v_f$

Where $v_f$ s the final velocity

$m_p v_p = (m_p + m_b) * v_f$

Making $v_f$ the subject

$v_f = (m_p v_p)/(m_b +m_p)$

substituting values

$v_f = ((0.070)*(5.60))/(0.47 + 0.070)$

$v_f = 0.726 \ m/s$

According to the law of energy conservation

$KE = PE$

Where KE is the kinetic energy of the system which is mathematically represented as

$KE = (1)/(2) (m_p + m_b)v_f^2$

And PE is the potential energy of the system which is mathematically represented as

$PE = (m_p +m_b) gh$

$(1)/(2) (m_p + m_b)v_f^2 = (m_p +m_b) gh$

Making h the subject of the formula

$h = (v_f^2)/(2g)$

substituting values

$h = ((0.726 )^2 )/(2 * 9.8)$

$h =0.0269 \ m$

Now the kinetic energy is conserved during collision because the system change it height during which implies some of the kinetic energy was converted to potential energy during collision

The the mechanical energy of the system during the collision is conserved because this energy consists of the kinetic and the potential energy.

Now after the collision the mechanical energy is not conserved because the external force like air resistance has reduced the mechanical energy of that system

In a Venn diagram, the separate circles contain characteristics unique to each item being compared and the intersection contains characteristics that are common to both items being compared. Ernie is working on the Venn diagram below to compare the career pathways of Biotechnology Research and Development and Diagnostic Services.What else could Ernie put in the common section?

Collecting data and analyzing results
Designing and implementing systems
Maintaining and using diagnostic equipment
Designing and using laboratory equipment
Mark this and return

Answers

Another thing that Ernie put in the common section is collecting data and analyzing results.

What is a Venn diagram?

A Venn diagram is used to show a representation of data. The center of the Venn diagram is often used to indicate the data set that is the same.

Looking at the Venn diagram, another thing that Ernie put in the common section is collecting data and analyzing results.

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I think its- Collecting data and analyzing results
Thats what I put.

The left ventricle of a resting adult's heart pumps blood at a flow rate of 85.0 cm3/s, increasing its pressure by 110 mm Hg, its velocity from zero to 25.0 cm/s, and its height by 5.00 cm. (All numbers are averaged over the entire heartbeat.) Calculate the total power output (in W) of the left ventricle. Note that most of the power is used to increase blood pressure.