7. Use the above graph of the sagittal plane knee angular velocity during walking to answer the following questions A. What is the peak flexion velocity of the knee?
B. What is the peak extension velocity of the knee?
C. What is the average angular acceleration between peak extension velocity and peak flexion velocity?
D. At time point 0.5 what is the joint doing? Flexing or extending?

Two kilograms of air within a piston–cylinder assembly executes a carnot power cycle with maximum and minimum temperatures of 800 k and 300 k, respectively. the heat transfer to the air during the isothermal expansion is 60 kj. at the end of the isothermal expansion the volume is 0.4 m3. assume the ideal gas model for the air. determine the thermal efficiency, the volume at the beginning of the isothermal expansion, in m3, and the work during the adiabatic expansion, in kj.