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

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Concept explainers

Angular speed, acceleration and displacement

Angular acceleration is defined as the rate of change in angular velocity with respect to time. It has both magnitude and direction. So, it is a vector quantity.

Angular Position

Before diving into angular position, one should understand the basics of position and its importance along with usage in day-to-day life. When one talks of position, it’s always relative with respect to some other object. For example, position of earth with respect to sun, position of school with respect to house, etc. Angular position is the rotational analogue of linear position.

Question

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

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