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in 1994, Vladimir Kurlivich , from Belarus, set the world record as the world's strongest weight lifter. he did this by lifting and holding above his head a barbell whise mass was 253kg. Kurlovich's mass at the time was 133 kg. caculate the normal force exerted on each of his feet during the time he. was having ldi g the barbell

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The free-body diagram of your question is; 2 downward forces (253 kg mass of barbell & 133 kg body mass of Kurlovich) acting together on a point supported by 2 upward forces as normal forces exerted by Kurlovich's feet.  

Solving the normal forces exerted by 2 feet :  

Summation of Forces Vertical = 0  

2 Dowwnard Forces = 2 Upward Forces (2F)  

253 + 133 = 2F  

2F = 386 Kgs  

F = 386 / 2  

F = 193 Kgs (Normal Force Exerted by Each Foot)

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