A Barbell Is 1

question 31

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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