Which description tells the length of time it takes for a planet to revolve around the sun?

Which property of metals allows corrosion to take place? reactivity malleability ductility conductivity Description

horrorfan [7]

Your best bet would be reactivity

7 0

3 years ago

Air enters a turbine operating at steady state at 8 bar, 1400 K and expands to 0.8 bar. The turbine is well insulated, and kinet

vladimir2022 [97]

To solve this problem it is necessary to apply the concepts related to the adiabatic process that relate the temperature and pressure variables

Mathematically this can be determined as

$\frac{T_2}{T_1} = (\frac{P_2}{P_1})^{(\frac{\gamma-1}{\gamma})}$

Where

$T_1 =$ Temperature at inlet of turbine

$T_2 =$ Temperature at exit of turbine

$P_1 =$ Pressure at exit of turbine

$P_2 =$ Pressure at exit of turbine

The steady flow Energy equation for an open system is given as follows:

$m_i = m_0 = m$

$m(h_i+\frac{V_i^2}{2}+gZ_i)+Q = m(h_0+\frac{V_0^2}{2}+gZ_0)+W$

Where,

m = mass

$m_i$ = mass at inlet

$m_0$ = Mass at outlet

$h_i$ = Enthalpy at inlet

$h_0$ = Enthalpy at outlet

W = Work done

Q = Heat transferred

$V_i$ = Velocity at inlet

$V_0$ = Velocity at outlet

$Z_i$ = Height at inlet

$Z_0$ = Height at outlet

For the insulated system with neglecting kinetic and potential energy effects

$h_i = h_0 + W$

$W = h_i -h_0$

Using the relation T-P we can find the final temperature:

$\frac{T_2}{T_1} = (\frac{P_2}{P_1})^{(\frac{\gamma-1}{\gamma})}$

$\frac{T_2}{1400K} = (\frac{0.8bar}{8nar})^{(\frac{1.4-1}{1.4})}$

$T_2 = 725.126K$

From this point we can find the work done using the value of the specific heat of the air that is 1,005kJ / kgK

So:

$W = h_i -h_0$

$W = C_p (T_1-T_2)$

$W = 1.005(1400-725.126)$

$W = 678.248kJ/Kg$

Therefore the maximum theoretical work that could be developed by the turbine is 678.248kJ/kg

5 0

4 years ago

13) Fred is travelling 3.4 m/s and decelerates at a rate of 0.83 m/s until he comes to a stop

Finger [1]

Answer:

<h2>Tt will take 4.04 seconds</h2>

Explanation:

In this problem/exercise, we are going to apply the newtons first equation of motion to solve for the time taken

Given that

final velocity= 3.4m/s

initia velocity u= 0m/s

deceleration= 0.84 m/s^2

time t= ?

applying

v=u+at

Substituting our given data into the expression above we have

3.4=0+0.84t

3.4=0.84t

divide both sides by 0.84 we have

3.4/0.84= t

t= 4.04 seconds

3 0

3 years ago

A scooter is accelerated from rest at the rate of 8m/s . How long will it take to cover a distance of 32m?

TiliK225 [7]

Speed = 8 m/s
Distance = 32 m

We need to find time

$\begin{gathered} {\underline{\boxed{ \rm {\red{Speed \: = \: \frac{Distance}{Time} }}}}}\end{gathered}$

$\begin{gathered} {\underline{\boxed{ \rm {\orange{Time \: = \: \frac{Distance}{Speed} }}}}}\end{gathered}$

<h3>Substuting the values</h3>

$\begin{cases} \large\rm{\purple{ {\leadsto} }} \: \: Time \: = \: \frac{32}{8} \\ \\ \large\rm{\purple{ {\leadsto} }} \: \: Time \: = \: \cancel\frac{32}{8} \\ \\ \large\rm{\purple{ {\leadsto} }} \: \: Time \: = \: 4 \: seconds \end{cases}$

6 0

3 years ago

А _ is a prediction about the outcome of a test or experiment. Answer here SUBM

Kamila [148]

Is his hypothesis if the have answer choices

4 0

3 years ago