Q3. A sphere is tested for drag resistance in a the wind tunnel. A pressure tapping at the stagnation point is attached to an inclined air/kerosene manometer, with the other end of the manometer attached to a static pressure tapping on the side of the tunnel. pair=1.2kg/m³. The kerosene has density pk. и Pair PK Write answers (symbolic and numerical) immediately below each part and show your key working steps on the next page. a) Neglecting the air density, write a symbolic expression for the stagnation pressure, pst, in terms of Pk, g, y and 9. Find the wind velocity in the tunnel when (pk, y, 0)-(780kg/m³, 0.04m, 30°).

Structural Analysis
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Chapter2: Loads On Structures
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Q3.
A sphere is tested for drag resistance in a the wind tunnel. A pressure tapping at the stagnation point
is attached to an inclined air/kerosene manometer, with the other end of the manometer attached to a
static pressure tapping on the side of the tunnel. Pair-1.2kg/m³.
The kerosene has density pk.
и
Pair
PK
Write answers (symbolic and numerical) immediately below each part and show your key
working steps on the next page.
a) Neglecting the air density, write a symbolic expression for the stagnation pressure, pst, in terms of
Pk, g, y and 0. Find the wind velocity in the tunnel when (px, y,0)=(780kg/m³, 0.04m, 30°).
b) Find the terminal velocity of a hailstone of diameter D=37.5mm and with specific gravity s=0.95,
falling in air with (Pair, Hair) (1.22kg/m³, 1.8x10-5Pa.s). Give the velocity, Reynolds number and
drag coefficient in the space below.
Transcribed Image Text:Q3. A sphere is tested for drag resistance in a the wind tunnel. A pressure tapping at the stagnation point is attached to an inclined air/kerosene manometer, with the other end of the manometer attached to a static pressure tapping on the side of the tunnel. Pair-1.2kg/m³. The kerosene has density pk. и Pair PK Write answers (symbolic and numerical) immediately below each part and show your key working steps on the next page. a) Neglecting the air density, write a symbolic expression for the stagnation pressure, pst, in terms of Pk, g, y and 0. Find the wind velocity in the tunnel when (px, y,0)=(780kg/m³, 0.04m, 30°). b) Find the terminal velocity of a hailstone of diameter D=37.5mm and with specific gravity s=0.95, falling in air with (Pair, Hair) (1.22kg/m³, 1.8x10-5Pa.s). Give the velocity, Reynolds number and drag coefficient in the space below.
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