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2 answers:
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Answer:
a)
b)
c) dP = 0 Pa
Explanation:
The specifies equation is :
Note that:
1% increase in temperature at specific volume:
a) Change in pressure of helium at constant volume:
R = 2.0769 kJ/kg-K
dT = 3.5 K
v = 0.75 m³/kg
b)
dv = (1%/100%) *0.75
dv = 0.0075 m³/kg
Change in pressure of helium at constant temperature:
R = 2.0769 kJ/kg-K
T = 350 K
v = 0.75 m³/kg
dv = 0.0075 m³/kg
c) The change in pressure of helium :
dP = 9.692 - 9.692
dP = 0
Answer:
The diameter of the aperture is 0.321 m
Explanation:
The expression for the angle with wavelength is equal to:
(eq. 1)
Where
λ = wavelength
d = diameter of the lens
The expression for the angle of the satellite is:
(eq. 2)
Where
h = distance between the Earth and the Moon
Like small angles:
Matching both equations and clearing Δx:
(eq. 3)
Where
λ = 633 nm = 633x10⁻⁹m
For the width of the central maxima is equal:
Where
w = 1.85 km
Replacing:
From equation 3, the diameter of the aperture is:
h = 3.84x10⁵km = distance between the Earth and the Moon
Replacing: