东尼死没死
Jacques(好聚好散)
物理老师给万圣节出的题 不难 但是很可爱 Does Donnie Die? Donnie is trapped in a house of horror. Assume for all the following questions that Donnie weighs 80kg and can be approximated as a very frightened particle. Gravity is approximated at 10N/s. 1. Donnie Slides down a 6m banister angled at 10 degrees to avoid a pack of ravening ghouls. He didn't notice the guy with the chainsaw at the end. If the coefficient of friction between the banister and Donnie is 0.40 and his initial velocity is 5m/s. Does Donnie stop in time? 2. Donnie falls onto a merry-go-round of radius 8m when it starts moving at a velocity of 4m/s. Donnie teeters near the edge as he notices a deep pit with glistening spikes surrounds the contraption. If the coefficient of static friction between Donnie's shoes and the slick surface of the merry-go-round is 0.15. Does Donnie fall to his doom? 3. A pack of gigantic rodents has surrounded Donnie. His only means of escape is to grab a rope holding a 100kg chandelier up by means of a pulley and cut it loose. The chandelier pulls Donnie upwards to a balcony. If the rodents can reach a height of 2 meters in 2 seconds.. Does Donnie make it with his feet still attached? 4. Donnie is dangling by a spider's thread when he notices an eight-foot-long spide climbing up the wall to eat him. Below he can hear the scurries of a million hungry baby spiders. Donnie needs to climb the thread at an acceleration of 3m/s*s in order to escape momma spider. If the maximum tension of the thread cannot exceed 1000N, does Donnie become dinner?
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