Momentum
2010-02-12 1:25 am
A machine-gun placed directly in front of a target fires seven thousand bullets pper minute into the target. The average mass of a bullet is four hundred grams and the bullets are fired at a speed of seven thousand and ninety metres per second. Calculate the average force exerted on the target in newtons.
回答 (2)
2010-02-22 1:33 am
無最佳解答
2010-02-12 3:59 am
Force = rate of change of momentum
hence, average force = 7000/60 x 400/1000 x 7090 N = 3.3 x 10^5 N
hence, average force = 7000/60 x 400/1000 x 7090 N = 3.3 x 10^5 N
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20100211000051KK01272