Question

The pressure at sea level was 102 kPa and the temperature is constant with height at 5°C. Determine

the pressure at 3000 m

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Answer 1

Answer:

outside pressure shows 1.2 kN/m2. Determine the outside pressure.

[101.2 kN/m2 absolute]

A

\u2013 60 kPa

P atm = 100.2 kPa

350 kPa

1.2 kPa

100 kPa

Figure E. 2.1 Figure E. 2.2

E.2.2. Determine the absolute and gauge pressures in chamber A as shown in Fig. E.2.2, the gauge

pressure being referred to atmospheric pressure of 1.02 × 105 N/m2. [390.2, 290 kN/m2]

E.2.3. In an artificial atmosphere, the specific weight of air varies with the altitude y as \u3b3 = c.y,

where \u3b3 is in N/m3 and y is in m. The pressure at y = 0 is 5000 N/m2. c is a dimensional

constant having a unit of N/m4. In this case c has a value of 1. Determine the expression for

pressure variation with altitude. [P = 5000 \u2013 (y2/2)]

E.2.4. Determine the pressure below 1000 m in the sea if the specific weight changes as \u3b3 = K. \u3b31/(K

+ \u3b31.y) where K is the bulk modulus having a value of 2 × 109 N/m2 and y is the depth in m. The

surface pressure is 101.3 kN/m2 and \u3b31 = 9810 N/m3. [9935 kN/m2]

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Explanation:

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