A piston-cylinder assembly contains a two-phase liquid-vapor mixture of H20 at 220 lbf/in^2 with a quality of 75%. The mixture is heated and expands at constant pressure until a final temperature of 475°F is reached. Determine the work for the process, in Btu per lb of H2O present.

Answer:

The weight of the combined system is 2001.24 Newtons

Explanation:

From the basic relation between mass, density and volume we know that

[tex]density=\frac{Mass}{Volume}[/tex]

In our context we are given that the density of water is 1000 kg per cubic meters

Thus we can find the mass of 0.2 cubic meters of water using the above relation as

[tex]1000kg/m^{3}=\frac{Mass}{0.2m^{3}}\\\\\therefore Mass=1000kg/m^{3}\times 0.2m^{3}=200kg[/tex]

Hence the mass of water in the tank is 200 kilograms.

The total mass of water and the plastic tank thus becomes

[tex]200+4=204kg[/tex]

Now we know that weight of any given mass is calculated as

[tex]Weight=mass\g[/tex]

where,

'g' is the acceleration due to gravity with value = [tex]9.81m/s^{2}[/tex]

Applying the values in the above equation we get

[tex]Weight=204\times 9.81=2001.24Newtons[/tex]

Explanation:

In shaping work piece will be stationary and tool will reciprocates,but on the other hand in planning work piece will reciprocates and tool will be stationary.Shaping is used for small work piece and planning is used for large work piece.Both shaping and planning are not continuous cutting process,cutting action take place in forward stroke and return stroke is idle stroke.The velocity of return stroke is much more than the forward stroke.

Answer:

6.8 kJ

Explanation:

p1 = 95 kPa

T1 = 300 K

T3 = 2100 K

m = 12 g

Ideal gas equation:

p * v = R * T

v = R * T / p

R for air is 0.287 kJ/(kg K)

v1 = 0.287 * 300 / 95 = 0.9 m^3/kg

v2 = v1 / cr

v2 = 0.9 / 18 = 0.05 m^3/kg

Assuming an adiabatic compression

p*v^k = constant

k is 1.4 for air

p1 * v1 ^ k = p2 * v2 ^ k

p2 = p1 * (v1 / v2) ^k

p2 = p1 * cr^k

p2 = 95 * 18^1.4 = 5.43 MPa

p1*v1/T1 = p2*v2/T2

T2 = p2*v2*T1/(p1*v1)

T2 = 5430 * 0.05 * 300 / (95 * 0.9) = 952 K

The first principle of thermodynamics

Q = W + ΔU

Since this is an adiabatic process Q = 0

W = -ΔU

W1-2 = -m * Cv * (T2 - T1)

The Cv of air is 0.72 kJ/kg

W1-2 = -0.012 * 0.72 * (952 - 300) = -5.63 kJ

Next the combustion happens and temperature increases suddenly.

v3 = v2 = 0.05 m^3/kg

T2 * p2^((1-k)/k) = T3 * p3^((1-k)/k)

p3 = p2 * (T2/T3)^(k/(1-k)

p3 = 5430 * (952/2100)^(1.4/(1-1.4) = 86.5 MPa

The work is zero because the piston doesn't move.

Next it expands adiabatically:

v4 = v1 = 0.9 m^3/kg

T * v^(k-1) = constant (adiabatic process)

T3 * v3^(k-1) = T4 * v4^(k-1)

T4 = T3 * (v3 / v4)^(k-1)

T4 = 2100 * (0.05 / 0.9)^(1.4-1) = 661 K

p3*v3/T3 = p4*v4/T4

p4 = p3*v3*T4/(v4*T3)

p4 = 86500*0.05*661/(0.9*2100) = 1512 kPa

L3-4 = -m * Cv * (T4 - T3)

L3-4 = -0.012 * 0.72 * (661 - 2100) = 12.43 kJ

Net work:

L1-2 + L3-4 = -5.63 + 12.43 = 6.8 kJ

Answer:

f=1.59 Hz

Explanation:

Given that

Simple undamped system means ,system does not consists any damper.If system consists damper then it is damped spring mass system.

Velocity = 100 mm/s

Maximum amplitude = 10 mm

We know that for a simple undamped system spring mass system

[tex]V_{max}=\omega A[/tex]

now by putting the values

[tex]V_{max}=\omega A[/tex]

100 = ω x 10

ω = 10 rad/s

We also know that

ω=2π f

10 = 2 x π x f

f=1.59 Hz

So the natural frequency will be f=1.59 Hz.

Answer:

1) Dimensions of shear rate is [tex][T^{-1}][/tex] .

2)Dimensions of shear stress are [tex][ML^{-1}T^{-2}][/tex]

Explanation:

Since the dimensions of velocity 'v' are [tex][LT^{-1}][/tex] and the dimensions of distance 'y'  are [tex][L][/tex] , thus the dimensions of [tex]\frac{dv}{dy}[/tex] become

[tex]\frac{[LT^{-1}]}{[L]}=[T^{-1}][/tex] and hence the units become [tex]s^{-1}[/tex].

Now we know that the dimensions of coefficient of dynamic viscosity [tex]\mu [/tex] are [tex][ML^{-1}T^{-1}][/tex] thus the dimensions of shear stress can be obtained from the given formula as

[tex][\tau ]=[ML^{-1}T^{-1}]\times [T^{-1}]\\\\[\tau ]=[ML^{-1}T^{-2}][/tex]

Now we know that dimensions of momentum are [tex][MLT^{-1}][/tex]

The dimensions of [tex]Area\times time[/tex] are [tex][L^{2}T][/tex]

Thus the dimensions of [tex]\frac{Moumentum}{Area\times time}=\frac{MLT^{-1}}{L^{2}T}=[MLT^{-2}][/tex]

Which is same as that of shear stress. Hence proved.

Answer:

Dimension of specific heat will be [tex]=L^2T^{-2}\Theta ^{-1}[/tex]

Explanation:

We know that heat [tex]Q=mc\Delta T[/tex], Q is heat generated, m is mass, c is specific heat and [tex]\Delta T[/tex] is temperature difference

From formula we can write [tex]c=\frac{Q}{m\times \Delta T}[/tex]

Now unit of Q is joule or N-m

Newton can be written as [tex]kgm/sec^2[/tex]

So unit of Q is [tex]kgm^2/sec^2[/tex]

For dimension we use M for kg, L for meter(m) ,T for sec and [tex]\Theta[/tex] for temperature

So dimension of Q is [tex]ML^2T^{-2}[/tex]

So dimension of specific heat will be [tex]\frac{ML^2T^{-2}}{M\Theta }=L^2T^{-2}\Theta ^{-1}[/tex]

The total kinetic energy of the system is approximately 17128.26 J.T

What is the energy?

Calculate the moment of inertia (I) of the pulley:

= 0.5 * mass * (outer radius² + inner radius²)

= [tex]0.5 * 12.0 kg * ((0.250 m)² + (0.200 m)²)[/tex]

= 1.925 kg * m²

Use the parallel-axis theorem to find I:

I = [tex]1.925 kg * m² + 12.0 kg * (0.231 m)²[/tex]

I = 2.5683 kg * m²

Calculate the kinetic energy of the pulley:

= 0.5 * I * omega²

= [tex]0.5 * 2.5683 kg * m² * (69.0 rad/s)[/tex]

= 6555.63 J

Calculate the linear velocity of cylinder A:

v = outer radius * omega

v =[tex]0.250 m * 69.0 rad/s[/tex]

v = 17.25 m/s

Calculate the kinetic energy of cylinder A:

= 0.5 * mass * v²

= [tex]0.5 * 71.0 kg * (17.25 m/s)²[/tex]

= 10572.63 J

KEtotal = KEpulley + KEcylinder

=  [tex]6555.63 J + 10572.63 J[/tex]

= 17128.26 J

Answer:

Explanation:

Heat will flow from system B to system A. This is because system B has a higher temperature than system A. Temperature is a measurement od thermodynamic equilibrium. A difference of temperature between two systems is a thermal unbalance, which if they are in contact is compensated by a flow of heat to change the temperatures and reach an equilibrium.

Answer:

1) Angle with x-axis = 42.03 degrees

2) Angle with y-axis =68.2 degrees

3) Angle with z-axis =   56.14 degrees

Explanation:

given any vector [tex]\overrightarrow{r}=x\widehat{i}+y\widehat{j}+z\widehat{k}[/tex]

and any x axis the angle between them is given by

[tex]\theta_x =cos^{-1}(\frac{\overrightarrow{r}\cdot\widehat{i}}{\sqrt{x^2+y^2+z^2}} )\\\\\theta_x=cos^{-1}(\frac{x\cdot i}{\sqrt{x^2+y^2+z^2}} )[/tex]

Applying values we get

[tex]\theta_x=cos^{-1}(\frac{160}{\sqrt{160^2+80^2+120^2}} )=42.03^{o}[/tex]

Angle between the vector and y axis is given by

[tex]\theta_y =cos^{-1}(\frac{\overrightarrow{r}\cdot\widehat{j}}{\sqrt{x^2+y^2+z^2}} )\\\\\theta_y=cos^{-1}(\frac{y\cdot j}{\sqrt{x^2+y^2+z^2}} )[/tex]

Applying values we get

[tex]\theta_x=cos^{-1}(\frac{80}{\sqrt{160^2+80^2+120^2}} )=68.2^{o}[/tex]

Similarly angle between z axis and the vector is given by

[tex]\theta_z =cos^{-1}(\frac{\overrightarrow{r}\cdot\widehat{k}}{\sqrt{x^2+y^2+z^2}} )\\\\\theta_x=cos^{-1}(\frac{z\cdot k}{\sqrt{x^2+y^2+z^2}} )[/tex]

Applying values we get

[tex]\theta_z=cos^{-1}(\frac{120}{\sqrt{160^2+80^2+120^2}} )=56.145^{o}[/tex]

The angles made by F will be "42.03°", "68.2°" and "56.14°".

According to the question,

Force, F = 160 i + 80 j + 120 kN

Let any vector,

[tex]\vec r = x \hat i + y \hat j+ z \hat k[/tex]

The angle between x-axis be:

[tex]\Theta_x[/tex] = Cos⁻¹ ([tex]\frac{\vec r. \hat i}{\sqrt{x^2 +y^2 + z^2} }[/tex])

    = Cos⁻¹ ([tex]\frac{x.i}{\sqrt{x^2+y^2+z^2} }[/tex])

By substituting the values,

    = Cos⁻¹ ([tex]\frac{160}{\sqrt{160^2+80^2+120^2} }[/tex])

    = 42.03°

and,

The angle between y-axis be:

[tex]\Theta_y[/tex] = Cos⁻¹ ([tex]\frac{\vec r. \hat j}{\sqrt{x^2 +y^2 + z^2} }[/tex])

    = Cos⁻¹ ([tex]\frac{y.i}{\sqrt{x^2+y^2+z^2} }[/tex])

By substituting the values,

    = Cos⁻¹ ([tex]\frac{80}{\sqrt{160^2+80^2+120^2} }[/tex])

    = 68.2°

and,

The angle between z-axis be:

[tex]\Theta_z[/tex] = Cos⁻¹ ([tex]\frac{\vec r. \hat k}{\sqrt{x^2 +y^2 + z^2} }[/tex])

    = Cos⁻¹ ([tex]\frac{z.k}{\sqrt{x^2+y^2+z^2} }[/tex])

By substituting the values,

    = Cos⁻¹ ([tex]\frac{120}{\sqrt{160^2+80^2+120^2} }[/tex])

    = 56.145°

Thus the above approach is correct.

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Answer:

eccentrcity of orbit is 0.22

Explanation:

GIVEN DATA:

Initial velocity of satellite = 8333.3 m/s

distance from the sun is 600 km

radius of earth is 6378 km

as satellite is acting parallel to the earth therefore[tex] \theta angle = 0[/tex]

and radial component of given velocity is zero

we have[tex] h = r_o v_r_o = 6378+600 =6.97*10^6 m[/tex]

h = 6.97*10^6 *8333.3 = 58.08*10^9 m^2/s

we know that

[tex]\frac{1}{r} =\frac{GM}{h^2} \times ( i + \epsilon cos\theta)[/tex]

[tex]GM = gr^2 = 9.81*(6.37*10^6)^2 = 398*10^{12} m^3/s[/tex]

so

[tex]\frac{1}{6.97*10^6} =\frac{398*10^{12}}{(58.08*10^9)^2} \times ( i + \epsilon cos0)[/tex]

solvingt for [tex] \epsilon)[/tex]

[tex]\epsilon = 0.22)[/tex]

therefore eccentrcity of orbit is 0.22

Answer:

The heat from the sun melted it

Explanation:

If the street runs east to west, houses on the south (across the street) will project shadows on their sidewalk, while the northern sidewalk will be illuminated. This is for the northern hemisphere, on the southern hemisphere it would be the other way around.

Answer:

The correct answer is option 'b': 9.9 m/s

Explanation:

We know that for an ideal fluid the velocity of exit from a tank with the height of water 'h' is given by Torricelli's Law as

[tex]v=\sqrt{2gh}[/tex]

where,

'g' is acceleration due to gravity

'h' is the level of water

Applying the given values we obtain velocity as

[tex]v=\sqrt{2\times 9.81\times 5}=9.90m/s[/tex]

Answer:

The correct answer is option 'b': 0.2%

Explanation:

The yield strength of a material is defined as the stress in the material when the material begin's to undergo plastic deformation which is also known as  yielding.

For materials with well defined yield point such as steel of grade Fe-250 the yield strength can be properly identified from the stress strain curve. But for high strength steel such as Fe-415, Fe-500 the yield point is not properly identified hence the yield strength is taken at 0.2% of proof strain.

Answer:

The mass in:

1) Grams =[tex]377765.5\times 10^{3}grams[/tex]

2) Kilograms =[tex]377765.5kilograms[/tex]

3)Tonnes =[tex]377.7655tonnes[/tex]

4) Megatonnes =[tex]0.378megatonnes[/tex]

Explanation: The given mass of the aircraft in pounds is 833,000 pounds.

Part 1)

Since we know that 1 pound equals 453.5 grams thus by ratio we have

833,000 pounds =[tex]833000lb\times 453.5\frac{g}{lb}=377765.5\times 10^{3}grams[/tex]

Part 2)

Since we know that 1000 grams equals 1 kilogram

thus the above mass in kilograms equals[tex]\frac{377765.5\times 10^{3}}{1000}=377765.5kg[/tex]

Part 3)

Since there are 1000 kilograms in 1 tonne

thus the given mass is converted into tonnes as

[tex]mass_{tonnes}=\frac{377765.5kg}{1000}=377.765tonnes[/tex]

Part 4)

Since 1 Mega tonne(Mton) equals 1000 tonnes thus the given mass is converted into mega tonnes as

[tex]mass_{M\cdot tonn}=\frac{377.7655tonnes}{1000}=0.378Megatonnes[/tex]

Answer:

Pipes, pressure vessels, tanks, reactors, tubes and nozzles

Explanation:

Thin walled cylinders are typically defines as having wall thickness of 1/10 of the radius (doesn't matter much if inner or outer, they should be similar). Also this is used mostly for things that will be subject to some radial load, as opposed to axles and shafts.

As such, some structures that can be modeled as thin walled cylinders are pipes, pressure vessels, tanks, reactors, tubes and nozzles.

Answer:

a) 19094 N

b) 110.055 kPa

c) 1222 J

Explanation:

The force on the gas is the weight plus the atmospheric pressure multiplied by the piston area

F = P + p * A

F = m * g + p * π/4 * d^2

F = 150 * 9.813 + 101570 * π/4 * 0.47^2 = 19094 N

The pressure is the force divided by the area of the piston

p1 = F / A

p1 = F / (π/4 * d^2)

p1 = 19094 / (π/4 * 0.47^2) = 110055 Pa = 110.055 kPa

variation of gravitational potential energy is defined as

ΔEp = m * g * Δh

ΔEp = 150 * 9.813 * 0.83 = 1222 J

In this exercise we have to use the knowledge of force to calculate the required energies, so we have to:

a) 19094 N

b) 110.055 kPa

c) 1222 J

In the field of physics, force is a physical action that causes deformation or that changes the state of rest or movement of a given object.

a) Knowing that the force formula is defined by:

[tex]F = P + p * A\\F = m * g + p *\pi /4 * d^2\\F = 150 * 9.813 + 101570 * \pi /4 * 0.47^2 = 19094 N[/tex]

b) Knowing that the force exerted by an area is equal to the pressure in that area, we have:

[tex]p_1 = F / A\\p_1 = F / (\pi /4 * d^2)\\p_1 = 19094 / (\pi /4 * 0.47^2) = 110055 Pa = 110.055 kPa[/tex]

c)So calculating the potential energy we have:

[tex]\Delta E_p = m * g * \Delta h\\\Delta E_p = 150 * 9.813 * 0.83 = 1222 J[/tex]

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Answer:

Total change in energy = 31 KJ.

Explanation:

Mass m=25 kg

Height h = 1 m

Initial velocity = 0

Final velocity = 50 m/s

Energy at initial condition

[tex]E_1=mgh+\dfrac{1}{2}mv^2[/tex]

[tex]E_1=25\times 10\times 1+0[/tex]

[tex]E_1=250\ J[/tex]

Energy at final condition

[tex]E_2=0+\dfrac{1}{2}\times 25\times 50^2[/tex]

[tex]E_2=31250\ J[/tex]

So the change in energy = 31250 -250 J

The total change in energy = 31000 J

Answer:

Change in  energy will be 31.25 KJ

Explanation:

We have given mass of the piston = 25 kg

Initial velocity u = 0 m/sec

Final velocity v = 50 m/sec

Kinetic energy is given by [tex]KE=\frac{1}{2}mv^2[/tex]

We have to find the change in energy

So change in energy = final KE - initial KE

[tex]\Delta E=\frac{1}{2}m(v^2-u^2)[/tex]

[tex]\Delta E=\frac{1}{2}25\times (50^2-0^2)=31250j=31.25KJ[/tex]

So change in  energy will be 31.25 KJ

Answer:

The charpy test is used to determine amount of energy a material absorbs at fracture.

Explanation:

Charpy Impact test was developed by a French scientist to determine the amount of energy a material absorbs at fracture hence giving the toughness of the material. It is widely used in industrial applications since it is easy to perform and does not requires sophisticated equipment to perform.

The test is performed when a swinging pendulum of known weight  is dropped from a known height and is made to strike the metal specimen which is notched.The notch in the sample affects the results of the test hence the notch should be standardized while performing the test. The qualitative results obtained can also be used to compare ductility of different materials.

Answer:

Explanation:

t1 = 1000 F = 1460 R

t0 = 80 F = 540 R

T2 = 3600 R

The working substance has an available energy in reference to the 80F source of:

B1 = Q1 * (1 - T0 / T1)

B1 = 100 * (1 - 540 / 1460) = 63 BTU

The available energy of the heat from the heat wource at 3600 R is

B2 = Q1 * (1 - T0 / T2)

B2 = 100 * (1 - 540 / 3600) = 85 BTU

The reduction of available energy between the source and the 1460 R temperature is:

B3 = B2 - B1 = 85 - 63 = 22 BTU

Explanation:

Damkohler numbers are mainly used in chemistry. It is a dimensionless number. It denotes the timescale at which the reaction takes place with relation to the transport phenomenon.

There are two Damkohler numbers

First Damkohler number is the ratio of reaction rate to the convective mass transport rate.

[tex]Da=\frac{\text{Reaction rate or chemical reaction timescale}}{\text{Convective mass transport rate}}[/tex]

Second Damkohler number is the ratio of reaction rate to the diffusive mass transfer rate

[tex]Da_{II}=\frac{\text{Reaction rate or chemical reaction timescale}}{\text{Diffusive mass transfer rate}}[/tex]

It can be seen from the equations that if the numerator is greater than the denominator then Da>1 and vice versa.

So,

When Da>1, the diffusion rate distribution is lower than the reaction rate.

When Da<1, the reaction rate is lower than the diffusion rate.

Answer:

Shearing stresses are the stresses generated in any material when a force acts in such a way that it tends to tear off the material.

Generally the above definition is valid at an armature level, in more technical terms shearing stresses are the component of the stresses that act parallel to any plane in a material that is under stress. Shearing stresses are present in a body even if normal forces act on it along the centroidal axis.

Mathematically in a plane AB the shearing stresses are given by

[tex]\tau =\frac{Fcos(\theta )}{A}[/tex]

Yes the shearing force which generates the shearing stresses is similar to frictional force that acts between the 2 surfaces in contact with each other.  

Answer:

b)False

Explanation:

When one or more than one monomer  join to other monomer then they form a chain and this joining of monomers is called degree of polymerization .

Degree of polymerization :

[tex]Degree\ of\ polymerization=\dfrac{Mass\ of\ polymer}{Mass\ of\ monomer}[/tex]

So from above we can say that when chain will become longer then the weight of polymer will increase.

Answer:

Therefore, height of instrument is 324.577 ft

Therefore, elevation of point x is 330 m

Explanation:

Given that

Plus sight on BM = 12.03 ft

Minus sight is = 5.43 ft

Elevation = 312.547 ft

Height of instrument is H.I

H.I = elevation on bench mark + plus sight

    =  312.547 + 12.03 = 324.577 ft

Therefore, height of instrument is 324.577 ft

Elevation at point x is = H.I - minus sight

                                    = 324.577 - (- 5.43)

                                     = 330.00 m

Therefore, elevation of point x is 330 m

Explanation:

Drag is the force which is generated parallel and also in opposition to direction of the travel for the object which is moving through the fluid.

Lift is the force which is generated perpendicular to direction of the travel for the object moving through the fluid.

Both of the two forces which are the lift and the drag force act through center of the pressure of object.

Answer:

[tex]Q=1752.3kJ[/tex]

Explanation:

Hello,

In this case, the transferred heat is defined via the first law of thermodynamics as shown below as it is about a rigid tank which does not perform any work:

[tex]Q_{in}=m_{H_2O}(u_2-u_1)[/tex]

The internal energy at the first state (80°C as a vapor-liquid mixture) is computed based on its quality as follows:

[tex]u_1=334.97kJ/kg+0.6*2146.6kJ/kg=1622.93kJ/kg[/tex]

Now, the specific volume turn out into:

[tex]v_1=0.001029m^3/kg+0.6*3.404271m^3/kg=2.0435916m^3/kg[/tex]

As the volume does not change due to the fact that this is about a rigid tank, we must look for a temperature at which the saturated vapor's volume matches with the previously computed volume. This turn out into a temperature of about 94.17 °C at which the internal energy of the saturated vapor is about (by interpolation):

[tex]u_2=2499.1kJ/kg[/tex]

In such a way, the energy transfer by heat is:

[tex]Q=2kg*(2499.1kJ/kg-1622.93kJ/kg)\\Q=1752.3kJ[/tex]

Best regards.

Answer:

11.125°

Explanation:

Given:

Radius of bend, R = 100 m

Speed around the bend = 50 Km/hr = [tex]\frac{5}{18}\times50[/tex] = 13.89 m/s

Now,

We have the relation

[tex]\tan\theta=\frac{v^2}{gR}[/tex]

where,

θ = angle of banking

g is the acceleration due to gravity

on substituting the respective values, we get

[tex]\tan\theta=\frac{13.89^2}{9.81\times100}[/tex]

or

[tex]\tan\theta=0.1966[/tex]

or

θ = 11.125°

Explanation:

Step1

Factor of safety is the number that is taken for the safe design of any component. It is the ratio of failure stress to the maximum allowable stress for the material.

Step2

It is an important parameter for design of any component. This factor of safety is taken according to the environment condition, type of material, strength, type of component etc.

Step3

Different material has different failure stress. So, ductile material fails under shear force. Ductile material’s FOS is based on yield stress as failure stress as after yield point ductile material tends to yield. Brittle material’s FOS is based on ultimate stress as failure stress.

The expression for factor of safety for ductile material is given as follows:

[tex]FOS=\frac{\sigma_{yp}}{\sigma_{a}}[/tex]

Here,[tex]\sigma_{f}[/tex] is yield stress and [tex]\sigma_{a}[/tex] is allowable stress.

The expression for factor of safety for brittle material is given as follows:

[tex]FOS=\frac{\sigma_{ut}}{\sigma_{a}}[/tex]

Here,[tex]\sigma_{ut}[/tex] is ultimate stress and [tex]\sigma_{a}[/tex] is allowable stress.

Answer:

The correct answer is 'velocity'of liquid flowing out of an orifice is proportional to the square root of the 'height'  of liquid above the center of the orifice.

Explanation:

Torricelli's theorem states that

[tex]v_{exit}=\sqrt{2gh}[/tex]

where

[tex]v_{exit}[/tex] is the velocity with which the fluid leaves orifice

[tex]h[/tex] is the head under which the flow occurs.

Thus we can compare the given options to arrive at the correct answer

Velocity is proportional to square root of head under which the flow occurs.

Answer:

b)False

Explanation:

Higher molecular weight will increase the mechanical properties because if molecular weight is more then it will require more energy break the molecule .It means that mechanical properties is also improve.

Higher molecular weight will also improve the resistance to corrosion and reduce the chances of material from oxidation.

Higher molecular weight will also increase the viscosity of material and reduce the fluidity.

Answer:

a)31%

b)34MW

Explanation:

A rankine cycle is a generation cycle using water as a working fluid, when heat enters the boiler the water undergoes a series of changes in state and energy until generating power through the turbine.

This cycle is composed of four main components, the boiler, the pump, the turbine and the condenser as shown in the attached image

To solve any problem regarding the rankine cycle, enthalpies in all states must be calculated using the thermodynamic tables and taking into account the following.

• The pressure of state 1 and 4 are equal

• The pressure of state 2 and 3 are equal

• State 1 is superheated steam

• State 2 is in saturation state

• State 3 is saturated liquid at the lowest pressure

• State 4 is equal to state 3 because the work of the pump is negligible.

Once all enthalpies are found, the following equations are used using the first law of thermodynamics

Wout = m (h1-h2)

Qin = m (h1-h4)

Win = m (h4-h3)

Qout = m (h2-h1)

The efficiency is calculated as the power obtained on the heat that enters

Efficiency = Wout / Qin

Efficiency = (h1-h2) / (h1-h4)

For this problem, we will first find the enthalpies in all states

h1=3231kJ/Kg

h2=2310kJ/Kg

h3=h4=272kJ/Kg

A) using the eficiency ecuation

Efficiency = (h1-h2) / (h1-h4)

Efficiency =(3231-2310)/(3231-272)=0.31=31%

b)using ecuation for Wout

Wout = m (h1-h2)

Wout=37(3231-2310)=34077KW=34.077MW