5 DETAILS SERPSE10 10.A.OP.036.BIO. a Ⓡ During a concentric loading of the quadriceps muscle in the upper leg, an athlete extends his lower leg from a vertical position (see figure (a)) to a fully extended horizontal position (see figure (b)) at a constant angular speed of 30.0° per second. Two of the four quadriceps muscles, the vastis intermedius and the rectus femoris, terminate at the patellar tendon which is attached to the top of the tibia in the lower leg. The distance from the point of attachment of the patellar tendon to the rotation axis of the tibia relative to the femur is 4.00 cm in this athlete. b (b) What is the power (in W) generated by the athlete during the motion? W MY NOTES ASK YOUR TEACHER (c) Modeling the lower leg as a thin rod with mass 4.00 kg and length 39.0 cm, what is the kinetic energy (in J) of the lower leg during the motion? PRACTICE ANOTHER (a) The two quadriceps muscles can exert a maximum force of 250 N through the patellar tendon. This force is applied at an angle of 25.0° to the section of the tibia between the attachment point and the rotation axis. What is the torque (in N. m) exerted by the muscle on the lower leg during this motion? (Enter the magnitude.) N.m
5 DETAILS SERPSE10 10.A.OP.036.BIO. a Ⓡ During a concentric loading of the quadriceps muscle in the upper leg, an athlete extends his lower leg from a vertical position (see figure (a)) to a fully extended horizontal position (see figure (b)) at a constant angular speed of 30.0° per second. Two of the four quadriceps muscles, the vastis intermedius and the rectus femoris, terminate at the patellar tendon which is attached to the top of the tibia in the lower leg. The distance from the point of attachment of the patellar tendon to the rotation axis of the tibia relative to the femur is 4.00 cm in this athlete. b (b) What is the power (in W) generated by the athlete during the motion? W MY NOTES ASK YOUR TEACHER (c) Modeling the lower leg as a thin rod with mass 4.00 kg and length 39.0 cm, what is the kinetic energy (in J) of the lower leg during the motion? PRACTICE ANOTHER (a) The two quadriceps muscles can exert a maximum force of 250 N through the patellar tendon. This force is applied at an angle of 25.0° to the section of the tibia between the attachment point and the rotation axis. What is the torque (in N. m) exerted by the muscle on the lower leg during this motion? (Enter the magnitude.) N.m
Physics for Scientists and Engineers: Foundations and Connections
1st Edition
ISBN:9781133939146
Author:Katz, Debora M.
Publisher:Katz, Debora M.
Chapter12: Rotation I: Kinematics And Dynamics
Section: Chapter Questions
Problem 68PQ: Lara is running just outside the circumference of a carousel, looking for her favorite horse to...
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