Monday, December 1, 2008
How Far Apart Should My Poles Be On A Pole Barn
mental Superestornudos
Superman few weeks ago someone in class asked about the impact it would have a sneeze of Superman. The answer given at that time was a little biased, and I kept wanting to expand topic because I had reported on the sneezing to a previous post. The
People have a lung capacity of between 4000 cm3 and 6000 cm3 in the case of men, and between 4500 cm3 and 3000cm3 in women. Breathing not expel all the air in our lungs, some is trapped along the respiratory tract, this is called residual volume. This residual amount is usually about 1200 cm3. Air density at standard conditions of temperature (20 degrees) and pressure (1 atm) is 1.2 kg/m3, we need our lungs house between between 4.8 g and 7.2 g of breathing air and expelled by 3, 4 g and 5.8 g for men. When sneezing air out of our lungs at speeds ranging between 110 km / h and 160 km / h, in units of the system serious international between 31 m / s and 45 m / s. If we now apply the law called that says Impulse Fm.t = Ap, where Fm represents the average force, At represents the time during which force is applied and Ap represents the increased momentum of the body. And consider that before sneezing air is at rest and the duration of the sneeze is 0.5 seconds, we find that the average force can come to practice with a sneeze would be of 0.13 newtons.
But we're not talking about a normal person, we're talking about Superman. He with his sneezing should be able to send a dog to take in the ass by far, at least. Nothing makes us think that Superman has some lungs with a body size large, nor breathing a gas other than oxygen, we believe it has a lung capacity of 6000 cm3 and breathe air. As Superman has superpowers, we assume that can expel all the air from his lungs, that means that Superman residual volume is zero. Now let's calculate how fast Superman should sneeze to move a dog. If we think the dog has a more or less half size and weighs about 15 kg environment, and if the coefficient of friction between his legs and the floor is 0.5, then we get that Superman must exert a force of 73.5 newtons at least to move the dog. If we apply the law of momentum, whereas the duration of the sneeze is 0.5 sec should get that Superman sneeze at 5100 m / s, a rate 15 times the speed of sound. If now we want Superman to be able to move a person of average weight (70 kg) with a coefficient of friction with the ground of 0.5, you should sneeze at a speed of 26000 m / s, 76 times the speed of sound . In addition, due to Newton's Third Law, a body which exerts a force is subjected to another of equal magnitude but opposite direction, your neck should stand forces of 343 newtons, equivalent to hit in the face with a hammer 4 kilos of nearly 300 km / h.
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