Amplitude and energy are inversely related, meaning that a high-energy wave has low amplitude and a low-energy wave has high amp
1 answer:
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Answer:
a) T₂ = 376.905 K
b) = 95.4%
Explanation:
Given:
Initial pressure, P₁ = 1.3 bar
Initial temperature, T₁ = 423 K
Initial velocity of air, v₁ = 40 m/s
Exit pressure, P₂ = 0.85 bar
Exit velocity of the air, v₂ = 307 m/s
gas constant for air, k = 1.4
also,
the specific heat for the air, Cp = 1.005 KJ/kg.K =1.005 × 10³ J/kg.K (standard)
a) applying the energy rate balance, we have
where, h is the enthalpy
on rearranging we get
also
h = Cp × T
thus,
on substituting the values, we get
or
T₂ = 376.905 K
b) The isentropic nozzle efficiency is given as:
for an isentropic process,we have the isentropic relation as:
on substituting the values and solving, we get
= 374.65 K
by applying the energy equation, we get the ideal exit velocity as:
on substituting the values, we get
or
thus,
substituting in the formula for efficiency, we get
or
= 95.4%
Answer:
<em>The largest surface area window that can be used is</em>
Explanation:
<u>Pressure</u>
The pressure is defined as force per unit area. The SI unit for pressure is the Pascal (Pa), defined as Newton per square meter.
If a force F acts on a surface area A, the pressure is calculated as:
The pressure at a depth of 90 m is P=1 Mpa= 1,000,000 Pa and the submarine's window can only take a force of F=10 kN=10,000 N.
We need to calculate the largest surface area of the window. We can solve the equation for A:
Substituting:
The largest surface area window that can be used is