EP PHYSICS (W/ANSWERS+INDEX)
10th Edition
ISBN: 9781119081739
Author: CUTNELL
Publisher: WILEY
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Chapter 21, Problem 17FC
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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 45.0° 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 4.10 cm in this athlete.
a
b
(a) The two quadriceps muscles can exert a maximum force of 225 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.)
(No Response) N⚫ m
(b) What is the power (in W) generated by the athlete during the motion?…
A 3.1-kg sphere is suspended by a cord that passes over a 1.6-kg pulley of radius 3.3 cm. The cord is attached to a spring whose force constant is k = 86 N/m as in the figure below. Assume the pulley is a solid disk.
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m
(a) If the sphere is released from rest with the spring unstretched, what distance does the sphere fall through before stopping?
(No Response) m
(b) Find the speed of the sphere after it has fallen 25 cm.
(No Response) m/s
The angular momentum vector of a precessing gyroscope sweeps out a cone as shown in the figure below. The angular speed of the tip of the angular momentum vector, called its precessional frequency, is given by @p = t/L, where is the magnitude of the torque on the gyroscope and L is the magnitude of
its angular momentum. In the motion called precession of the equinoxes, the Earth's axis of rotation precesses about the perpendicular to its orbital plane with a period of 2.58 × 104 yr. Model the Earth as a uniform sphere and calculate the torque on the Earth that is causing this precession.
(No Response) N⚫ m
Chapter 21 Solutions
EP PHYSICS (W/ANSWERS+INDEX)
Ch. 21.2 - 1. Suppose that you accidentally use your left...Ch. 21.2 - Prob. 2CYUCh. 21.2 - Prob. 3CYUCh. 21.3 - Prob. 4CYUCh. 21.3 - Prob. 5CYUCh. 21.3 - Prob. 6CYUCh. 21.3 - Prob. 7CYUCh. 21.3 - Prob. 8CYUCh. 21.3 - Prob. 9CYUCh. 21.3 - Prob. 10CYU
Ch. 21.5 - Prob. 11CYUCh. 21.7 - Prob. 13CYUCh. 21.7 - Prob. 14CYUCh. 21.7 - Prob. 15CYUCh. 21.7 - Prob. 16CYUCh. 21.7 - Prob. 17CYUCh. 21.7 - Prob. 18CYUCh. 21 - Prob. 2FCCh. 21 - Prob. 3FCCh. 21 - Prob. 6FCCh. 21 - Prob. 8FCCh. 21 - Prob. 12FCCh. 21 - Prob. 13FCCh. 21 - Prob. 16FCCh. 21 - Prob. 17FCCh. 21 - Prob. 1PCh. 21 - Prob. 2PCh. 21 - Prob. 3PCh. 21 - Prob. 4PCh. 21 - Prob. 5PCh. 21 - Prob. 6PCh. 21 - 7. A magnetic field has a magnitude of 1.2 × 10?3...Ch. 21 - Prob. 8PCh. 21 - Prob. 9PCh. 21 - Prob. 10PCh. 21 - Prob. 11PCh. 21 - Prob. 12PCh. 21 - Prob. 13PCh. 21 - 14. A charged particle with a charge-to-mass ratio...Ch. 21 - Prob. 15PCh. 21 - Prob. 16PCh. 21 - Prob. 17PCh. 21 - Prob. 18PCh. 21 - Prob. 19PCh. 21 - Prob. 20PCh. 21 - Prob. 21PCh. 21 - Prob. 22PCh. 21 - Prob. 23PCh. 21 - Prob. 24PCh. 21 - Prob. 25PCh. 21 - Prob. 26PCh. 21 - Prob. 27PCh. 21 - *28. Review Conceptual Example 2 as background for...Ch. 21 - Prob. 29PCh. 21 - Prob. 30PCh. 21 - Prob. 31PCh. 21 - Prob. 32PCh. 21 - 33. A horizontal wire of length 0.53 m, carrying a...Ch. 21 - Prob. 34PCh. 21 - Prob. 35PCh. 21 - Prob. 36PCh. 21 - Prob. 37PCh. 21 - Prob. 38PCh. 21 - Prob. 39PCh. 21 - Prob. 40PCh. 21 - Prob. 41PCh. 21 - Prob. 42PCh. 21 - Prob. 43PCh. 21 - Prob. 44PCh. 21 - Prob. 45PCh. 21 - Prob. 46PCh. 21 - Prob. 47PCh. 21 - Prob. 48PCh. 21 - Prob. 49PCh. 21 - Prob. 50PCh. 21 - Prob. 51PCh. 21 - Prob. 52PCh. 21 - Prob. 53PCh. 21 - Prob. 54PCh. 21 - Prob. 55PCh. 21 - Prob. 56PCh. 21 - Prob. 57PCh. 21 - Prob. 58PCh. 21 - Prob. 59PCh. 21 - Prob. 60PCh. 21 - Prob. 61PCh. 21 - Prob. 62PCh. 21 - Prob. 63PCh. 21 - Prob. 64PCh. 21 - Prob. 65PCh. 21 - Prob. 66PCh. 21 - Prob. 67PCh. 21 - Prob. 68PCh. 21 - Prob. 69PCh. 21 - Prob. 72APCh. 21 - Prob. 73APCh. 21 - Prob. 74APCh. 21 - Prob. 75APCh. 21 - Prob. 76APCh. 21 - Prob. 77APCh. 21 - Prob. 78APCh. 21 - Prob. 79APCh. 21 - Prob. 80APCh. 21 - Prob. 81APCh. 21 - Prob. 83APCh. 21 - Prob. 84APCh. 21 - Prob. 85AP
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