A wind tunnel is being used to study the aerodynamics of a full-scale model rocket that is 30  cm long. Scaling for drag calculations are based on the Reynolds number. The rocket has an expected maximum velocity of 190 km/h. What is the Reynolds number at this speed? Assume  ambient air is at 20°C. The wind tunnel is capable of speeds up to 160 km/h; so an attempt is  made to improve this top speed by varying the air temperature. Calculate the equivalent speed  for the wind tunnel using air at 5°C and 65°C. Would replacing air with carbon dioxide provide  higher equivalent speeds?

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Conservation of Energy

In physics, the rule of the conservation of energy states that energy doesn’t disappear from the atmosphere; instead, it changes its form from one type to another. Energy is one of the most important physical quantities in nature, and it cannot be created or destroyed — only transformed.