1個1蚊硬幣係高空擲落街擲得死人嗎?(要附理據)

2008-12-21 7:32 pm
上網睇d科學謬誤話1個硬幣係高空擲落黎
被擲中既人都只係會有刺痛既感覺?really?

回答 (6)

2008-12-23 3:45 am
✔ 最佳答案
要視乎擲落黎既高度有幾高
高得制既話,落黎果陣時可能困為同空氣摩擦而燒着,
高温+上衝擊力可能會令佢死
參考: 我
2008-12-22 3:57 pm
其實睇F=ma e條式係唔可以判斷到硬幣造成既傷害程度,
應該睇既係,衝力:F=(mv-mu)/t,
物體在愈高的地方掉下時,到地面的時侯速度愈高,因此人們承受的衝力愈大!
同時,因為硬幣接觸人體既表面面積少,所以人們承受既壓力會好大,就好似用刀吉自己咁,係因為壓力大先吉得入,可以用P=F/A,計算.
2008-12-22 7:46 am
No. A coin falling from height will reach a Terminal Velocity when hte weight is equal to the air friction. ( mg = air friction )
As air friction is propotional to square of velocity, it certainly will happen.
The estimated terminal verlocity of a coin is 40 - 60mph range.

Also, a coin is light. The impact of it, even at 60mph, is not enough to kill a person. However, it certainly can cause injury.

I have been hit at my leg by a stone with similar size and speed on a motorcycle on the highway, it was really hurt but no serious harm. I believe it happen quite often in the highway.
2008-12-22 6:20 am
要視乎個硬幣的落點,如果係垂直的話,個硬幣可能會呈刀片狀直接進入體內。
參考: 思考
2008-12-21 7:44 pm
不會 因為所以而 且但是
2008-12-21 7:36 pm
Yes,被擲中既人都只係會有刺痛既感覺


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