A generator operating at 50 Hz delivers 1 pu power to an infinite bus through a transmission circuit in which resistance is ignored. A fault takes place reducing the maximum power transferable to 0.5 pu whereas before the fault, this power was 2.0 pu and after the clearance of the fault, it is 1.5 pu. Using equal area criterion, determine the critical clearing angle.

Answer:

hello the answer options are missing here are the options

A)The thickness of the heated region near the plate is increasing

B)The velocities near the plates are increasing

C)The fluid temperature near the plate are increasing

ANSWER : all of the above

Explanation:

Laminar flow  is the flow of a type of fluid across the surface of an object following regular paths and it is unlike a turbulent flow which flows in irregular paths (encountering fluctuations)

For laminar flow over a hot flat plate, the local heat transfer coefficient decreases with distance because :

Answer:

Hello your question lacks some values here are the values

T1 = 500⁰c,  T7 = 70⁰c, Qb = 240000 kj/s

answer : A)  56%

               B) 134400 kw ≈  134.4 Mw

Explanation:

Given values

T1 (tmax) = 500⁰c = 773 k

T7(tmin) = 70⁰c = 343 k

Qb = 240000 kj/s

A) Determine the maximum possible efficiency

[tex]n_{max}[/tex] = 1 - [tex]\frac{tmin}{tmax}[/tex] * 100

       = 1 - ( 343 / 773 )

       = 1 - 0.44 = 0.5562 * 100 ≈ 56%

B) Determine the power output for this complex steam power plant design

[tex]p_{out}[/tex] = Qb * max efficiency

      = 240000 kj/s * 56%

      = 240000 * 0.56 = 134400 kw ≈  134.4 Mw

Answer:

Attached is the complete question but the weight of the mailbox and cross bar differs from the given values which are : weight of mail box = 3.2 Ib, weight of the uniform cross member = 10.3 Ib

Answer : moment of inertia = 186.7 Ib - in

Explanation:

Given data

weight of the mailbox = 3.2 Ib

weight of the uniform cross member = 10.3 Ib

The origin is of mailbox and cross member is 0

The perpendicular distance from Y axis of centroid of the mailbox

= 4 + (25/2) = 16.5"

The centroid of the bar =( ( 1 + 25 + 4 + 4 ) / 2 ) - 4  = 13"

therefore The moment of Inertia( Mo) = (3.2 * 16.5) + ( 10.3 * 13)

                                     = 52.8 + 133.9 = 186.7 Ib-in

The combined moment about O due to the weight of the mailbox and the cross member AB is; M_o = 122.4 lb.in (ccw)

We are given;

Weight of mailbox; W_m = 3.2 lb

Weight of uniform cross member; W_c = 10.3 lb

Now, from the attached diagram, let us calculate the geometric location of the mailbox and uniform cross section from point O.

Geometric location of mailbox from point O; g_m = 3 + (19/2) = 12.5 in

Geometric location of cross member from point O;

g_c = (¹/₂(1 + 19 + 3 + 7)) - 7

g_c = 8 in

Thus. combined moment about point O is;

M_o = (W_m × g_m) + (W_c × g_c)

M_o = (3.2 × 12.5) + (10.3 × 8)

M_o = 122.4 lb.in

Since positive then it is counterclockwise. Thus;

M_o = 122.4 lb.in (ccw)

The image of this question is missing and so i have attached it.

Read more at; https://brainly.com/question/14303536

The negative mark is balanced by a positive mark on the set key scale while the jaws are closed.

It is common practice to shut the jaws or faces of the system before taking some reading to guarantee a zero reading. If not, please take care of the read. This read is referred to as "zero defect."

There are two forms of zero error:

zero-mistake positive; and

Non-null mistake.

----------------------------

Hope this helps!

Brainliest would be great!

----------------------------

With all care,

07x12!

The criteria for a guard having to be used on a machine is;

As a safety measure If the operation exposes you to an injury.

When operating a machine, there are possibilities that the operator could be injured or exposed to injury.

Due to the possible safety issues when operating a machine, the Occupational Safety and Health Administration (OSHA) in their 29 code mandated that a safeguard must be put at each machine to ensure that there is adequate safety that prevents or minimizes the risk of getting injured.

Read more on Occupational Safety and Health Administration (OSHA) rules at; https://brainly.com/question/17069021

Answer: (0,0)+ (1,0)= 1 lines upwards( suggesting that this is a line graph not saying it is but as an example) an (1,1) and (0,-1) all make a small square ( as this is a 2 dimensional graph that it has a negative side too,(below the positive side)) i hope this helps and is what you are looking for

Explanation:

Answer:

dx/dt = kx(9000-x) where k > 0

Explanation:

Number of students in the campus, n = 9000

Number of students who have contracted the flu = x(t) = x

Number of students who have bot yet contracted the flu = 9000 - x

Number of Interactions between those that have contracted the flu and those that are yet to contract it = x(9000 - x)

The rate of spread of the disease = dx/dt

Note: the rate at which the disease spread is proportional to the number of interactions between those that have contracted the flu and those that have not contracted it.

[tex]\frac{dx}{dt} \alpha [x(9000 -x)]\\[/tex]

Introducing a constant of proportionality, k:

dx/dt = kx(9000-x) where k > 0

Answer:

1.887 minutes

Explanation:

We are given k = 0.07 dm3 /mol*min at 300 K and E = 20 kcal/mol = 20000 cal/mol

To solve this, first of all let's calculate the rate constant(k);

For this question, The formula is;

K(t) = k(300K) × exp[(E/R)((1/300) - (1/T2))]

R is gas constant = 1.987 cal/mol.K

For temperature of 70°C which is = 70 + 273K = 343K, we have;

K(343) = 0.07 × exp[(20000/1.987)((1/300) - (1/343))]

K(343) = 4.7 dm³/mol.min

The design equation is;

dX/dt = -(rA/C_Ao) = K•(C_Ao)²•(1 - X)²/(C_Ao) = (KC_Ao)(1 - X)²

Since there is no change in volume by cause of the state at which the reaction is carried out, that is liquid. Thus, integrating and solving for time for a 90% conversion we obtain;

(0.9,0)∫dX/(1 - X)².dX = (KC_Ao)((t, 0)∫dt

So, we'll get;

0.9/(1 - 0.9) = 4.77 × 1 × t

t = 9/4.77

t = 1.887 minutes

Answer:

A TVS screen works when the pixels are switched on electronically using liquid crystals to rotate polarized light.

Explanation:

Answer:

100000000000000000000000

Answer:

1) twelve

Explanation:

The dual voltage motors are used in day to day operations. The wye is connected with 9 lead motors. Maximum resistance can be obtained if the resistance are connected in series. To check resistance of dual voltage wye motor there must be twelve resistance readings of 1 ohm each.

Answer:

863 K

Explanation:

See the attachment

Answer:

The critical buckling load is [tex]\mathbf{P_o = 141.61 \ kN}[/tex]

Explanation:

Given that:

the width of the rectangular steel = 37.5 mm = 0.0375 m

the thickness = 50 mm  = 0.05 m

the length = 1.75 m

modulus of elasticity = 200 Gpa = 200 10⁹ × Mpa

We are to calculate the critical buckling load  [tex]P_o[/tex]

Using the formula:

[tex]P_o = \dfrac{\pi ^2 E I}{L^2}[/tex]

where;

[tex]I = \dfrac{0.0375^3*0.05}{12}[/tex]

[tex]I = 2.197 * 10^{-7}[/tex]

[tex]P_o = \dfrac{\pi ^2 *200*10^9 * 2.197*10^{-7}}{1.75^2}[/tex]

[tex]P_o = 141606.66 \ N[/tex]

[tex]\mathbf{P_o = 141.61 \ kN}[/tex]

The critical buckling load is [tex]\mathbf{P_o = 141.61 \ kN}[/tex]

Answer:

No, the velocity profile does not change in the flow direction.

Explanation:

In a fluid flow in a circular pipe, the boundary layer thickness increases in the direction of flow, until it reaches the center of the pipe, and fill the whole pipe. If the density, and other properties of the fluid does not change either by heating or cooling of the pipe, then the velocity profile downstream becomes fully developed, and constant, and does not change in the direction of flow.

Answer:

- 1.19 lb/ft^3

Explanation:

You are given the following information;

Radius r = 20 ft

Speed V = 100 ft/s

You should use Bernoulli equation pertaining to streamline. That is, normal to streamline.

The pressure gradient = dp/dn

Where air density rho = 0.00238 slugs per cubic foot.

Please find the attached files for the solution and diagram.

Answer:

The answer is 920 kJ

Explanation:

Solution

Given that:

Mass = 5kg

Pressure = 600 kPa

Temperature = 80° C

Liquid vapor mixture state (quality) = 0.3

Now we find out the amount of heat extracted in the process

Thus

Properties of  RI34a at:

P₁ = 600 kPa

T₁ = 80° C

h₁ = 320 kJ/kg

So,

P₁ = P₂ = 600 kPa

X₂ =0.3

h₂ = 136 kJ/kg

Now

The heat removed Q = m(h₁ -h₂)

Q = 5 (320 - 136)

Q= 5 (184)

Q = 920 kJ

Therefore the amount of heat extracted in the process is 920 kJ

Answer:

The answer is 2.25 kΩ

Explanation:

Solution

Given that:

The resistance reading on a DMM'S meter face = 22.5 ohms

The range selector switch = R * 100 range,

We now have to find the actual measure resistance of the circuit which is given below:

The actual measured resistance of the circuit is=R * 100

= 22.5 * 100

=2.25 kΩ

Hence the measured resistance of the circuit is 2.25 kΩ

Answer:

i) Truth Table:

A      |     B     |     C     |     O

0      |     0     |     0     |      0

0      |     0     |     1      |      0

0      |     1      |     0     |      0

0      |     1      |     1      |      0    (condition 2 not satisfied)

1       |     0     |     0     |      0

1       |     0     |     1      |      1    (both conditions satisfied)

1       |     1      |     0     |      1    (both conditions satisfied)

1       |     1      |     1      |      1    (both conditions satisfied)

ii) The minimized sum of products (SOP) expression is

O = AC + AB

Explanation:

We have three inputs A, B and C

Let O is the output.

We are given two conditions to open the vault door:

1. At  least two people must insert their keys into the assigned locks at the same  time.

2. The trainee bank teller (C) can only open the vault when the bank  manager (A) is present in the opening.

i) Construct the Truth Table

A      |     B     |     C     |     O

0      |     0     |     0     |      0

0      |     0     |     1      |      0

0      |     1      |     0     |      0

0      |     1      |     1      |      0    (condition 2 not satisfied)

1       |     0     |     0     |      0

1       |     0     |     1      |      1    (both conditions satisfied)

1       |     1      |     0     |      1    (both conditions satisfied)

1       |     1      |     1      |      1    (both conditions satisfied)

ii) SOP Expression using Karnaugh-Map:

A 3 variable Karnaugh-map is attached.

The minimized sum of products (SOP) expression is

O = AC + AB

The orange pair corresponds to "AC" and the purple pair corresponds to "AB"

Bonus:

The above expression may be realized by using two AND gates and one OR gate.  

Please refer to the attached logic circuit diagram.

Answer:

the answer is

Explanation:

Answer:

B- Fluorinated gas

Explanation:

Answer:

B.) fluorinated gas

Explanation:

Answer:

A) W' = 178.568 KW

B) ΔS = 2.6367 KW/k

C) η = 0.3

Explanation:

We are given;

Temperature at state 1;T1 = 360 °C

Temperature at state 2;T2 = 160 °C

Pressure at state 1;P1 = 10 bar

Pressure at State 2;P2 = 1 bar

Volumetric flow rate;V' = 0.8 m³/s

A) From table A-6 attached and by interpolation at temperature of 360°C and Pressure of 10 bar, we have;

Specific volume;v1 = 0.287322 m³/kg

Mass flow rate of water vapour at turbine is defined by the formula;

m' = V'/v1

So; m' = 0.8/0.287322

m' = 2.784 kg/s

Now, From table A-6 attached and by interpolation at state 1 with temperature of 360°C and Pressure of 10 bar, we have;

Specific enthalpy;h1 = 3179.46 KJ/kg

Now, From table A-6 attached and by interpolation at state 2 with temperature of 160°C and Pressure of 1 bar, we have;

Specific enthalpy;h2 = 3115.32 KJ/kg

Now, since stray heat transfer is neglected at turbine, we have;

-W' = m'[(h2 - h1) + ((V2)² - (V1)²)/2 + g(z2 - z1)]

Potential and kinetic energy can be neglected and so we have;

-W' = m'(h2 - h1)

Plugging in relevant values, the work of the turbine is;

W' = -2.784(3115.32 - 3179.46)

W' = 178.568 KW

B) Still From table A-6 attached and by interpolation at state 1 with temperature of 360°C and Pressure of 10 bar, we have;

Specific entropy: s1 = 7.3357 KJ/Kg.k

Still from table A-6 attached and by interpolation at state 2 with temperature of 160°C and Pressure of 1 bar, we have;

Specific entropy; s2 = 8.2828 KJ/kg.k

The amount of entropy produced is defined by;

ΔS = m'(s2 - s1)

ΔS = 2.784(8.2828 - 7.3357)

ΔS = 2.6367 KW/k

C) Still from table A-6 attached and by interpolation at state 2 with s2 = s2s = 8.2828 KJ/kg.k and Pressure of 1 bar, we have;

h2s = 2966.14 KJ/Kg

Energy equation for turbine at ideal process is defined as;

Q' - W' = m'[(h2 - h1) + ((V2)² - (V1)²)/2 + g(z2 - z1)]

Again, Potential and kinetic energy can be neglected and so we have;

-W' = m'(h2s - h1)

W' = -2.784(2966.14 - 3179.46)

W' = 593.88 KW

the isentropic turbine efficiency is defined as;

η = W_actual/W_ideal

η = 178.568/593.88 = 0.3

Answer:

The answer is B. Avoid making a large wake.

Explanation:

When passing a fishing boat it is important to maintain a minimal wake due to the dangers a large wake could pose to the fishing boat you are passing, it is part of maintaining safety on the water.

You can not pass on the sides with the fishing lines also, and you are supposed to communicate to the fishing boat before taking the appropriate action.

Answer:

[tex]W_s =[/tex] 283.181 hp

Explanation:

Given that:

Air enters a compressor operating at steady state at a pressure [tex]P_1[/tex] =  176.4 lbf/in.^2  and Temperature [tex]T_1[/tex] at 260°F

Volumetric flow rate V = 424 ft^3/min

Air exits at a pressure [tex]P_2[/tex]  = 15.4 lbf/in.^2 and Temperature [tex]T_2[/tex] at 80°F.

Heat transfer occurs at a rate of 6800 Btu/h from the compressor to its surroundings; since heat is released to the surrounding; then:

[tex]Q_{cv}[/tex] = -6800 Btu/h  = - 1.9924 kW

Using the steady  state  energy in the process;

[tex]h_2 - h_1 + g(z_2-z_1)+ \dfrac{1}{2}(v^2_2-v_1^2) = \dfrac{Q_{cv}}{m}- \dfrac{W_s}{m}[/tex]

where;

[tex]g(z_2-z_1) =0[/tex]  and  [tex]\dfrac{1}{2}(v^2_2-v_1^2) = 0[/tex]

Then; we have :

[tex]h_2 - h_1 = \dfrac{Q_{cv}}{m}- \dfrac{W_s}{m}[/tex]

[tex]h_2 - h_1 = \dfrac{Q_{cv} - W_s}{m}[/tex]

[tex]{m}(h_2 - h_1) ={Q_{cv} - W_s}[/tex]

[tex]W_s ={Q_{cv} + {m}(h_2 - h_1)[/tex] ----- (1)

Using the relation of Ideal gas equation;

P₁V₁ = mRT₁

Pressure [tex]P_1[/tex] =  176.4 lbf/in.^2   = ( 176.4 ×  6894.76 ) N/m² = 1216235.664 N/m²

Volumetric flow rate V = 424 ft^3/min = (424 ×  0.0004719) m³  /sec

= 0.2000856 m³  /sec

Temperature = 260°F = (260°F − 32) × 5/9 + 273.15 = 399.817 K

Gas constant R=287 J/kg K

Then;

1216235.664 N/m² × 0.2000856 m³  /sec = m × 287 J/kg K × 399.817 K

[tex]m = \dfrac { 1216235.664 N/m^2 \times 0.2000856 m^3 /sec } {287 J/kg K \times 399.817 K }[/tex]

m = 2.121 kg/sec

The change in enthalpy:

[tex]m(h_1-h_2) = m * C_p * \Delta T= m* C_p * ( T_1 -T_2)[/tex]

[tex]= 2.121* 1.005* ( 399.817 -299.817)[/tex]

= 213.1605 kW

From (1)

[tex]W_s ={Q_{cv} + {m}(h_2 - h_1)[/tex]

[tex]W_s =[/tex]  - 1.9924 kW + 213.1605 kW

[tex]W_s =[/tex] 211.1681  kW

[tex]W_s =[/tex] 283.181 hp

The power input is [tex]W_s =[/tex] 283.181 hp

Answer:

b

Explanation:

a) ADC is located on DAQ filter but not the reconstruction filter

b) to remove aliasing, the sampling rate must be greater than or equal ot twice the highest frequency component in the input signal. In other words, all frequencies in input sgnal are less than fs/2. Therefore, frequencies greater than fs/2 are removed by anti-aliasing filter

c) the DAC can have different sampling rate from ADC

Answer:

a) T₃ = 1818.8 K

b) η = 0.614 = 61.4%

c) MEP = 660.4 kPa

Explanation:

a) According to Table A-2 of The ideal gas specific heat of gases, the properties of air are as following:

At 300K

The specific heat capacity at constant pressure = [tex]c_{p}[/tex] = 1.005 kJ/kg.K,

The specific heat capacity at constant volume = [tex]c_{v}[/tex] = 0.718 kJ/kg.K

Gas constant R for air = 0.2870 kJ/kg·K

Ratio of specific heat  k = 1.4

Isentropic Compression :

[tex]T_{2}[/tex] =  [tex]T_{1}[/tex]  [tex](v1/v2)^{k-1}[/tex]

   = 300K ([tex]16^{0.4}[/tex])

[tex]T_{2}[/tex]    = 909.4K

P = Constant heat Addition:

[tex]P_{3}v_{3} / T_{3} = P_{2} v_{2} /T_{2}[/tex]

[tex]T_{3}=v_{3}/v_{2}T_{2}[/tex]

2[tex]T_{2}[/tex] = 2(909.4K)

      = 1818.8 K

b) [tex]q_{in}[/tex] = [tex]h_{3}-h_{2}[/tex]

         =  [tex]c_{p}[/tex] ([tex]T_{3}[/tex] - [tex]T_{2}[/tex])

         = (1.005 kJ/kg.K)(1818.8 - 909.4)K

         = 913.9 kJ/kg

Isentropic Expansion:

[tex]T_{4}[/tex] =  [tex]T_{3}[/tex]  [tex](v3/v4)^{k-1}[/tex]

    =  [tex]T_{3}[/tex] [tex](2v_{2} /v_{4} )^{k-1}[/tex]

    = 1818.8 K (2 / 16[tex])^{0.4}[/tex]

    = 791.7K

v = Constant heat rejection

[tex]q_{out}[/tex] = μ₄ - μ₁

      = [tex]c_{v} ( T_{4} - T_{1} )[/tex]

      = 0.718 kJ/kg.K (791.7 - 300)K

      = 353 kJ/kg

 η[tex]_{th}[/tex] = 1 - [tex]q_{out}[/tex] / [tex]q_{in}[/tex]

       = 1 - 353 kJ/kg / 913.9 kJ/kg

       = 1 - 0.38625670

       = 0.6137

       = 0.614

      = 61.4%

c) [tex]w_{net}._{out}[/tex] = [tex]q_{in}[/tex] - [tex]q_{out}[/tex]

                = 913.9 kJ/kg - 353 kJ/kg

                = 560.9 kJ/kg

[tex]v_{1} = RT_{1} /P_{1}[/tex]

   = (0.287 kPa.m³/kg/K)*(300 K) / 95 kPa

   =  86.1 / 95

   = 0.9063 m³/kg = v[tex]_{max}[/tex]

[tex]v_{min} =v_{2} = v_{max} /r[/tex]

Mean Effective Pressure = MEP =   [tex]w_{net,out}/v_{1} -v_{2}[/tex]

                                                    = [tex]w_{net,out}/v_{1}(1-1)/r[/tex]

                                                    = 560.9 kJ/kg / (0.9063 m³/kg)*(1-1)/16

                                                    = (560.9 kJ / 0.8493m³) (kPa.m³/kJ)

                                                    = 660.426 kPa

Mean Effective Pressure = MEP = 660.4 kPa

The temperature after the addition process is 1724.8k, the thermal efficiency of the engine is 56.3% and the mean effective pressure is 65.87kPa

Assumptions made:

a) The temperature after the addition process:

Considering the process 1-2, Isentropic expansion

at

[tex]T_1=300k\\u_1=214.07kJ/kg\\v_o_1=621.3\\v_o_2=\frac{v_2}{v_1} *v_o_1[C.R=16]=v_2/v_1\\v_o_2=(v_2/v_1)v_o_1=1/16*621.2=38.825[/tex]

From using this value, v[tex]_o_2[/tex]=38.825, solve for state point 2;

[tex]T_2=862.4k\\h_2=890.9kJ/kg[/tex]

Considering the process 2-3 (state of constant heat addition)

[tex]\frac{p_3v_3}{t_3}=\frac{p_2v_2}{t_2} \\\\T_3=\frac{P_3V_3T_2}{V_2} \\T_3=(\frac{V_3}{V_2}) T_2\\\frac{v_3}{v_2}=2\\T_3=2(862.4)=1724.8k\\[/tex]

NB: p[tex]_3[/tex]≈p[tex]_2[/tex]

b) The thermal efficiency of the engine is

Q[tex]_i_n[/tex]=h[tex]_3-h_2[/tex] = 1910.6-890.9=1019.7kJ/kg

Considering process 3-4,

[tex]v_o_4=\frac{v_A}{v_2}\\ v_o_3 =\frac{V_a}{V_2}*\frac{v_2}{v_3}\\v_o_3=\frac{16}{2}*4.546\\v_o_3=36.37;v_4=659.7kJ/kg[/tex]

Q[tex]_o_u_t=v_4-u_1=659.7-214.07=445.3kJ/kg[/tex]

nth = [tex]1-\frac{Q_o_u_t}{Q_i_n}=1-\frac{445.63}{1019.7}=0.5629*100=56.3%[/tex]%

The thermal efficiency is 56.3%

W[tex]_n_e_t[/tex]=[tex]Q_i_n-Q_o_u_t=574.07kJ/kg[/tex]

[tex]v_1=\frac{RT_1}{p_1}=\frac{0.287*300}{95}=0.906m^3/kg\\v_2=v_1/16=0.05662m^3/kg\\[/tex]

Therefore, the mean effective pressure of the system engine is

[tex]\frac{W_n_e_t}{v_1-v_2}=675.87kPa[/tex]

The mean effective pressure is 65.87kPa as calculated above

Learn more about mean effective pressure

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Answer:

The speed will be "3.58 ft/s". The further explanation is given below.

Explanation:

Number of knots

= 15

For the similarity of Froude number:

⇒  [tex]\frac{V_{m}}{\sqrt{g_{m}l_{m}} }=\frac{V}{\sqrt{gl} }[/tex]

Here,

[tex]l = length[/tex]

[tex]g_{m}=g[/tex]

⇒  [tex]\frac{V_{m}}{V}=\sqrt{\frac{l_{m}}{l} }[/tex]

    [tex]V_{m}=\sqrt{\frac{1}{50} }\times number \ of \ knots[/tex]

         [tex]=\sqrt{\frac{1}{50}}\times 15[/tex]

         [tex]=2.12 \ knots[/tex]

Now,

⇒  [tex]1 \ knots=0.514\times 3.281[/tex]

                 [tex]=1.69 \ ft/s[/tex]

So that,

⇒  [tex]V_{m}=2.12\times 1.69[/tex]

          [tex]=3.58 \ ft/s[/tex]

Answer:

HVACR Industry Trade Groups

Explanation:

Answer:

  radiative heat loss substantially increases as the wall temperature declines

Explanation:

The body's heat loss due to convection is ...

  (2 W/m^2·K)((32 -20)K) = 24 W/m^2

__

The body's heat loss due to radiation in the summer is ...

  [tex]\epsilon\sigma(T_b^4-T_w^4)\quad\text{where $T_b$ and $T_w$ are body and wall temperatures ($^\circ$K)}\\\\0.90\cdot 5.6703\cdot 10^{-8}(305.15^4-300.15^4)\,\text{W/m$^2$}\\\\\approx 28.3\,\text{W/m$^2$}[/tex]

The corresponding heat loss in the winter is ...

  [tex]0.90\cdot 5.6703\cdot 10^{-8}(305.15^4-287.15^4)\,\text{W/m$^2$}\\\\\approx 95.5\,\text{W/m$^2$}[/tex]

Then the total of body heat losses to surroundings from convection and radiation are ...

  summer: 24 +28.3 = 52.3 . . . W/m^2

  winter: 24 +95.5 = 119.5 . . . W/m^2

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It is reasonable that a person would feel chilled in the winter due to the additional radiative loss to the walls in the winter time. Total heat loss is more than doubled as the wall temperature declines.

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Answer:

The answer to this question can be defined as follows:

Explanation:

The sky driver began his sky journey from Arkansas, drove across the Tennessee River then landed in North Carolina. He returned to both the north in the very same direction. He began with NC, traveled through Tennessee, eventually lands in Arkansas. But North Carolina has been in the third state on which skydiver was traveling over, and It's also more than 700 miles from Arkansas to the NC.