Leighton is attempting a biceps curl with a 10 kg dumbbell. She is standing up right, and her forearm is horizontal. The moment arm of the dumbbell about Leighton’s elbow joint is 28.5 cm (show all work)A. What torque is created by the dumbbell about the elbow joint?B. What torque is created by Leighton’s elbow flexor muscles to hold the dumbbell in this position? Ignore the weight of her arm and hand.C. If the elbow flexor muscles contract with a force of 1000 N and hold the barbell in static equilibrium, what is the moment arm of the elbow flexor muscles about the elbow joint? 40cm7. Leigh is doing a knee extension exercise using a100 N weight strapped to her ankle 40 cm from herknee joint. She holds her leg so that the horizontaldistance from her knee joint to the weight is 30 cm.(Show all work)a. For this position, what torque is created bythe weight about her knee joint axis?b. If the moment arm of the knee extensormuscles is 4 cm about the knee joint axis,what amount of force must these muscles30 cmproduce to hold the leg in the positiondescribed? Ignore the weight of the leg.8. Leighton is attempting a biceps curl with a 10 kg dumbbell. She is standing upright, andher forearm is horizontal. The moment arm of the dumbbell about Leighton's elbow jointis 28.5 cm. (Show all work)What torque is created by the dumbbell about the elbow joint?b. What torque is created by Leighton's elbow flexor muscles to hold the dumbbellin this position? Ignore the weight of her arm and hand.c. If the elbow flexor muscles contract with a force of 1000 N and hold the barbell instatic equilibrium, what is the moment arm of the elbow flexor muscles about theelbow joint?a.9. A barbell is loaded with two 20 kg plates on its right side and two 20 kg plates on its leftside. The barbell is 2.2 m long, and its unloaded mass is 20 kg. The two 20 kg plates onthe right side are locked in place at 35 cm and 40 cm from the right end of the bar. Thetwo 20 kg plates on the left side have slipped. One is 30 cm from the left end of the bar,and the other is 20 cm from the left end of the bar (Show all work)

a) Determine the torque created by the weight about the knee joint axis.

Answered: Leighton is attempting a biceps curl…

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter11: Angular Momentum

Section: Chapter Questions

Problem 77P: The axis of Earth makes a 23.5 angle with a direction perpendicular to the plane of Earth’s orbit....

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Leighton is attempting a biceps curl with a 10 kg dumbbell. She is standing up right, and her forearm is horizontal. The moment arm of the dumbbell about Leighton’s elbow joint is 28.5 cm (show all work) A. What torque is created by the dumbbell about the elbow joint? B. What torque is created by Leighton’s elbow flexor muscles to hold the dumbbell in this position? Ignore the weight of her arm and hand. C. If the elbow flexor muscles contract with a force of 1000 N and hold the barbell in static equilibrium, what is the moment arm of the elbow flexor muscles about the elbow joint?

40cm
7. Leigh is doing a knee extension exercise using a
100 N weight strapped to her ankle 40 cm from her
knee joint. She holds her leg so that the horizontal
distance from her knee joint to the weight is 30 cm.
(Show all work)
a. For this position, what torque is created by
the weight about her knee joint axis?
b. If the moment arm of the knee extensor
muscles is 4 cm about the knee joint axis,
what amount of force must these muscles
30 cm
produce to hold the leg in the position
described? Ignore the weight of the leg.
8. Leighton is attempting a biceps curl with a 10 kg dumbbell. She is standing upright, and
her forearm is horizontal. The moment arm of the dumbbell about Leighton's elbow joint
is 28.5 cm. (Show all work)
What torque is created by the dumbbell about the elbow joint?
b. What torque is created by Leighton's elbow flexor muscles to hold the dumbbell
in this position? Ignore the weight of her arm and hand.
c. If the elbow flexor muscles contract with a force of 1000 N and hold the barbell in
static equilibrium, what is the moment arm of the elbow flexor muscles about the
elbow joint?
a.
9. A barbell is loaded with two 20 kg plates on its right side and two 20 kg plates on its left
side. The barbell is 2.2 m long, and its unloaded mass is 20 kg. The two 20 kg plates on
the right side are locked in place at 35 cm and 40 cm from the right end of the bar. The
two 20 kg plates on the left side have slipped. One is 30 cm from the left end of the bar,
and the other is 20 cm from the left end of the bar (Show all work)

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