experimental site: South Gate Plaza experimental equipment: cucumber, banana A4-paper, etc. If the kite line is hung up the people, how much force Injurious how much 16:00 yesterday, the reporter in Xi'an Han Guang secondary school physics teacher, teacher's help, the South Gate Plaza, a simulation experiment. Kite flying,
ralph lauren pas cher, kite string erratic difficult experiment did not use the site to fly a kite, but accepted when the teacher's recommendations: the kite string, tie one end of a flexible branches of the most remote, to maintain a certain flexibility and tightness, the other end of the pull in the hands of the reporter. This case the pull of the kite line and kite floating in the air kite string tension is quite similar to the kite lines taking into account the harm to human body, mainly divided into the pressure line of the moment after a positive impact and the line wraps cutting two case,
The students said the ...lder bag to school _ News,
polo ralph lauren pas cher, the experiment is divided into two content: teacher trot crossing the finish line cucumber banana cut two hands to commence an A4 paper, normal walking speed frontal crash kite line,
バーバリー コート, A4 paper and the kite line are new,
Thieves burglary fall ...ir parents claim to theft, A4 paper cut in half. Next, when the teacher hands cucumber, normal walking speed,
air jordan, hit the front of the kite line. Contact of the cucumber and the kite line, kite string embedded itself in the cucumber about 1 cm deep, and the kite line affects the branches of trees swaying back and forth. Subsequently,
burberry, when a teacher holding a cucumber trot forward,
louboutin pas cher, when the cucumber and kite line contact, cucumber instantly cut off. The cross section is very neat, as the knife, so that site participants by surprise. Finally, the teacher holding a banana to the front of the trotting speed crossing the finish line, skin banana was successfully cut into two. The isobar cutting skin banana Qi stubble cut off the cutting forces generated pull in order to test the kite lines such as human skin, when teachers use these items to a set of simulation experiments. He put a cucumber on the sideways stretch kite line, and then quickly from low to high compression sliding along the direction of the kite line, sliding twenty or thirty centimeters, cut the cucumber is kite line. Then, the teacher cucumber replaced by bananas, pressed sliding the same distance, the banana is cut off, the cross section are as sliced. Calculated from data in riding a motorcycle was on the program of the kite line results will be like a knife to cut vegetables that horrible then, the tension of the kite line is how much instant impact on the human body and the pressure Engaged in the 27 years of physics teaching when the teacher said,
polo ralph lauren, which requires two formulas to calculate. First, the object forces suffered the impulse is equal to the momentum of an object changes, you can use the momentum theorem to calculate. The expression of the momentum theorem: Ft = mv''-mv. The formula F is the force of research object, t is the duration of action of the force. v'' for the final velocity, typically 0, v is the initial velocity. Second, the size of the force on the object per unit area is pressure. Definition of the pressure P = F / S. P is the pressure. F is the pressure. S is the force area. From these two expressions can easily be seen: the object the greater the quality,
louboutin, the greater the speed, and the shorter contact time of the kite line, kite line is finer, and object to withstand the pressure is greater, the greater the harm big. Assume that Miss Ma weight of 50kg, riding a bicycle speed of 5 m / sec, her head and kite line contact time of 1 second, calculated using the momentum theorem, F = (mv''-mv) / t = 50 × 5/1 = 250 cattle. Then use the pressure of the definition of the calculation. The kite line is very thin, with a diameter of only 0.5 mm,
louboutin, in accordance with the contact and body length of 10 cm, the contact area for 0.00005m 2. P = F / S = 250/0.00005 = 5 × 106 Pascal. This is equivalent to a nail cover pressing a kilos. Assume a weight of 50kg members of the public on a motorcycle forward speed of 10 m / sec. Her head (or face) and kite line contact time of 1 second, this is the case, calculated using the momentum theorem, F = 500 cattle. Then use the pressure of the definition of the calculation, p = 5 × 107 Pascal. This pressure is equivalent to a kitchen knife to cut vegetables, the vegetables to withstand the pressure,
burberry soldes, "very, very terrible." Responsibility to explore to bear responsibility for a good walk suddenly cable or kite line to hang up even kite-flying of the kite line wounding cuts, this responsibility who should bear it Shaanxi high wish Lawyer Gao would like to say that the civil action the defendant, the specific facts and reasons. If cable scratches, the cable management department should be held accountable; if the kite line scratch, fly a kite should be held accountable. As Miss Ma encountered this situation, if you want to be held accountable, we must first look for the kite-flying. "Members of the public loved to fly a kite,
バーバリー 財布, which also sounded the alarm bell,
sac burberry, kite-flying in their own entertainment at the same time, do not give other people cause gratuitous harm." It is understood that the Xi'an city people choose a place to fly a kite, often Xi'an where the historical sites,
User photographed Chon...m wonders (Photos) _ news, such as the Bell and Drum Tower Square, Hanguangmen the southeast, near the southwest corner of the city, more pedestrians and vehicles. At present, provinces, municipalities and kite-flying places and geographical, had not been defined. This series of articles written by this reporter Qing Rong Bo
