- the ruler is exactly 1 m long and has mass 664 g - the mass hangers have negli

Question

- the ruler is exactly 1 m long and has mass 664 g
- the mass hangers have negligible mass.
1-a: Suppose the ruler in procedure 2 is asymmetrical,(center of mass is not at 50 cm) and it is balanced on a fulcrum at the 48.7 cm mark (at the center of mass). Now, mass M is hung on the ruler at the 90 cm mark.
- Where must you hang mass 2.92M so the system remains in equilibrium?
At the _________ cm mark

1-b: The method of procedure 2 can be used to accurately determine the mass of a light coin. Suppose the ruler is now perfectly symmetrical, and it balances at the center. The coin of unknown mass is placed at the 0 cm mark, it is balanced by a mass m = 36.9 g placed at the 81.6 cm mark. Find the mass of the coin.

mcoin = _______ g

Explanation / Answer

M (coin) * 45 = ( 36.9 ) * (81.6 – 45 )

M (coin) = 1350.54 / 45 = 30 g

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