You are tasked to design a parachute with the following requirements: Weight of falling payload = 981 N (100 kg) Diameter = 7.5 m Terminal velocity = 6 m/s The parachute is expected to be used in a typical environment of 15°C and atmospheric pressure. If you are to create a one-tenth scale model of the parachute to be tested in a wind tunnel under the same conditions, a) Calculate the drag coefficient of the prototype and b) Determine the speed by which the wind tunnel should be run to achieve dynamic similarity. Hint: Cp P' P

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Entropy

In physics, entropy means the amount of disorder or the degree of randomness associated with a thermodynamic system. The system is not self-organized when the entropy of the system is high. For instance, when a system is at an elevated temperature, its molecules are in random motion, vibrating and colliding with each other. During this scenario, the probability of finding a molecule at a particular place twice, is low. Under this circumstance, the system can be said to be in a high entropy.