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         Researchers plan to test a 1: 13 model of a ballistic missile in a high speed wind tunnel. The prototype missile will travel at 380 m/s through air at 230 C and 95.0 kPa (abs).

(i)   If the air in the wind tunnel test section has a temperature of -200 C at a pressure of 89 kPa (abs), what must its velocity be? And

(ii)  Estimate the drag force on the prototype if the drag force on the model is 400 N.   

                                        

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