what isthe center of gravity答案

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• what isthe center of gravity答案
• what's the center of gravity?
• what isthe center of gravity答案
• What is it that found in the every center of America and Australia?请问这是什么意思?答案又是什么?
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• A copper block rests 29.3 cm from the center of a steel turntable.The coefficient ofstatic friction between block and surface is0.476.The turntable starts from rest and rotates with a constant angular acceleration of 0.49 rad/sThe acceleration of gravity is 9.8 m/s.After what interval will the block start toslip on the turntable?[ Hint:Ignore the tangential component of the acceleration.]Answer in units of s
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• 如果复数z满足z+1-i的绝对值=2,那么z-2+i的绝对值的最大值是