Concepts (a) Calculate the force the woman in Figure 7.46 exerts to do a push-up at constant speed, taking all data to be known to three digits. (b) How much work does she do if her center of mass rises 0.240 m? (c) What is her useful power output if she does 25 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.

Step-by-step solution Step 1 of 6 The equation to find the power is, Here is the power, is the work done and is the time period. Step 2 of 6 (a) Consider the figure provided in the textbook, Here is the torque due to center of mass, is the torque due to normal reaction force on woman, is the reaction force on woman and is the weight. Step 3 of 6 Substitute for and for .