Thursday
April 17, 2014

Homework Help: Physics

Posted by Sean on Sunday, April 7, 2013 at 1:40pm.

1. You have a large wind tunnel of cross-sectional area 0.61[m2]. The wind speed is 4[ms-1]. Assume air density is 1 [kgm-3]. The Drag is 2.3[N].
What is the coeffecient of drag for the shape that has diameter 7.32[cm]? .
Use three sig. figs. or N/A if there is not enough information.

2. You have a large wind tunnel of cross-sectional area 0.95[m2]. You have a set of shapes that are all the same shape except they each have a different cross-sectional area. The wind speed is held constant at 3.2[ms-1]. Assume air density is 1 [kg m-3]. The slope of Drag versus Area for this data is 0.45. [Slope units left out purposefully by me for sake of next question.]
What is the coeffecient of drag for the shape? .
Use three sig. figs. or N/A if there is not enough information.

3. The slope from the plot of Drag versus Area in the question above has units of
[N]
[m2]
[kgm-3]
No units
[Nm-2]

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