Two Supports, Made of the Same Material and Initially of Equal

question 51

Multiple Choice

Two supports, made of the same material and initially of equal length, are 2.0 m apart.A stiff board with a length of 4.0 m and a mass of 10 kg is placed on the supports, with one support at the left end and the other at the midpoint.A block is placed on the board a distance of 0.50 m from left end.As a result the board is horizontal (that is, the downward force on each support is the same) .The mass of the block is:

• A)0 kg
• B)2.3 kg
• C)6.6 kg
• D)10 kg
• E)20 kg

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