Two friends, Joe and Sam. go to the gym together to strength tram They decide to

Question

Two friends, Joe and Sam. go to the gym together to strength tram They decide to start off with an exercise called flat bench press. Lying flat on a bench with their arms in an extended position, they slowly lower (to their chest) and then raise a barbell back to the starting position. They start off by using a 33.0 kg barbell. Joe is taller than Sam which means Joe's arms are 67.0 cm long while Sam's are 59.0 cm. Calculate the work done by Joe, W_Joe. when he raises the barbell to finish one repetition The acceleration due to gravity is 9.81 m/s^2. W_Joe = Remember Sam also does the exercise. How does the amount of work Sam does, W_Sorn, lifting the weight compare to Joe? Choose the correct operator from the list below

Explanation / Answer

Well,as the barbell has reached its starting point completing 1 repetition : the work done against gravity is zero,as displacement is zero after one repetition.

Secondly,though the displacements for Sam and Joe are different in bringing it lower to chest,but both have zero displacement for the barbell fir 1 repetition so,Work done by both of them is zero. ass W= Force*displacement.as displacement is zero :W=0.

Wsam = Wjoe.

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