A transmitter antenna is of a vertical pipe, 20 cm diameter and 25 m in height, on top of a tall structure. It is subjected to wind speed of 20 m/sec. Density of air is 1.22 kg/m3; its viscosity is 1.8 x 10-5 Ns/m2. Drag coefficient of a (tall) circular cylinder is tabulated as Re 102 103 1.3 × 103 104 1.5 × 104 1.06 × 105 1.2 × 105 4.5 × 105 CD1.61.050.951.01.081.00.890.26What is the drag experienced?

A transmitter antenna is of a vertical pipe, 20 cm diameter and 25 m i

1.	A transmitter antenna is of a vertical pipe, 20 cm diameter and 25 m in height, on top of a tall structure. It is subjected to wind speed of 20 m/sec. Density of air is 1.22 kg/m3; its viscosity is 1.8 x 10-5 Ns/m2. Drag coefficient of a (tall) circular cylinder is tabulated as Re 102 103 1.3 × 103 104 1.5 × 104 1.06 × 105 1.2 × 105 4.5 × 105 CD1.61.050.951.01.081.00.890.26What is the drag experienced?
A.	737 N
B.	700 N
C.	670 N
D.	63 N
Answer» B. 700 N

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A transmitter antenna is of a vertical pipe, 20 cm diameter and 25 m in height, on top of a tall structure. It is subjected to wind speed of 20 m/sec. Density of air is 1.22 kg/m3; its viscosity is 1.8 x 10-5 Ns/m2. Drag coefficient of a (tall) circular cylinder is tabulated as Re 102 103 1.3 × 103 104 1.5 × 104 1.06 × 105 1.2 × 105 4.5 × 105 CD1.61.050.951.01.081.00.890.26What is the drag experienced?
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