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ï¼1ï¼
æ¯åè´¨éM = 0.5 kgï¼æ°´è´¨ém = 1 kgï¼æä½ç¹é度为v1 = 8 m/s²ï¼åå¾r = 1·m
令æé«ç¹é度v2
è½éå®æï¼1/2mv1²=mg(2r)+1/2mv2²
v2² = v1²-4gr = 8²-4*10*1 = 24
æé«ç¹ç»³æå为T
T+(M+m)g=(M+m)v2²/r
T = (M+m)*(v2²/r-g) = (0.5+1)*(24/1-10) = 21 N
ï¼2ï¼
令水æ¯åºååFï¼
F+mg=mv2²/r
F = m(v2²/r-g) = 1*(24/1-10) = 14 N
ï¼3ï¼
æé«ç¹æ°´æ°å¥½ä¸æµåºï¼æ¯åºååFâ=0
å³ï¼F = m(v2â²/r-g) = 0
v2'² = gr = 10*1 = 10
1/2mv1â²=mg(2r)+1/2mv2â²
v1' = â(v2â²+4gr) = â(10+4*10*1) = 5â2 â 7.07 m/s
为使å°æ¯éè¿æé«ç¹æ¶æ°´ä¸æµåºï¼å¨æä½ç¹æ¶çæå°éç5â2 â 7.07 m/s
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