Pls explain why we need to substract 280 60 kg as give in ncert il...

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Pls explain why we need to substract 280 60 kg as give in ncert il 1 1 8 10 N Example 9 3 In a human pyramid in a group is supported by the legs of a circus the entire weight of the balanced performer who is lying on his back as shown in Fig 9 5 The combined mass of all the persons performing the act and the tables plaques etc involved is 280 kg The mass of the performer lying on his back at the bottom of the pyramid is 60 kg Each thighbone femur of this performer has a length of 50 cm and an effective radius of 2 0 cm Determine the amount by which each thighbone gets compressed under the 1 A Us thi d O 9

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