A meter stick is pivoted at the 0.50 m line. a 3kg object, Ask an Expert

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Q. A singly ionized helium atom has only one electron bound to the nucleus. What is the radius of the ion while it is in the second excited state?

Q. A meter stick is pivoted at the 0.50 m line. A 3kg object is hung from the 0.15-m line. Where should a 5kg object be hung to achieve equilibrium (the meter stick oriented horizontal and motionless)?

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