E EJ (a) Calculate the force (in N) the woman in the gure below exerts to do a push-up at constant speed, taking all data to be known to three digits. (You may need to use torque methods from a later chapter.) m=53kg (lo) How much work (in J) does she do if her center of mass rises 0.260 m? :1 (c) What is her useful power output (in W) if she does 24 push-ups in 1 min? (Should work done lowering her bodyr be included? See the discussion of useful work in Work. Energy, and Power in Humans.) W H (a) Calculate the force (in N) the woman in the figure below exerts to do a push-up at constant speed, taking all data to be known to three digits. (You may need to use torque methods from a later chapter.) m = 53 kg CG W 0.87 m Freaction 1.45 m 311.64 N (b) How much work (in ]) does she do if her center of mass rises 0.260 m? -135.044 x ] (c) What is her useful power output (in W) if she does 24 push-ups in 1 min? (Should work done lowering her body be included? See the discussion of useful work in Work, Energy, and Power in Humans.) 54.0176 W