A Barbell Is 1

question 60

Multiple Choice

A barbell is 1.5 m long. Three weights, each of mass 20 kg, are hung on the left and two weights of the same mass, on the right. The width of each weight is 4 cm and each group of weights is placed 4 cm from the ends. Where is the center of mass of the barbell as measured from the mid-point, M, of the bar? The bar is of uniform mass and has mass 5 kg, and the retaining collars are of negligible mass. Take to the right as positive.

• A) -5.90 cm
• B) -5.62 cm
• C) +5.62 cm
• D) +5.90 cm
• E) None of the above

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