You are helping a patient to strengthen their hip flexors. Your patient is performing a hip flexion exercise as illustrated below (assume knee in full extension). While he was standing, you measured the distance from the hip joint to the center of mass of the thigh, shank and foot to be 0.32, 0.68, and 0.98m. The masses of his thigh, shank, and foot are 15.6, 11.2, and 3.1kg. Calculate the amount of hip flexor muscle torque required to hold the leg isometrically at 35°. Foot, 0.98m from Hip Shank, 0.68m from Hip Thigh, 0.32m from Hip IBS Hip Joint

You are helping a patient to strengthen their hip flexors. Your patient is performing a hip flexion exercise as illustrated below (assume knee in full extension). While he was standing, you measured the distance from the hip joint to the center of mass of the thigh, shank and foot to be 0.32, 0.68, and 0.98m. The masses of his thigh, shank, and foot are 15.6, 11.2, and 3.1kg. Calculate the amount of hip flexor muscle torque required to hold the leg isometrically at 35°. Foot, 0.98m from Hip Shank, 0.68m from Hip Thigh, 0.32m from Hip IBS Hip Joint

University Physics Volume 1

18th Edition

ISBN:9781938168277

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

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

Chapter12: Static Equilibrium And Elasticity

Section: Chapter Questions

Problem 37P: To get up on the roof, a person (mass 70.0 kg) places 6.00-m aluminum ladder (mass 10.0 kg) against...

See similar textbooks

Related questions

Q: Two ice skaters, starting from rest, hold onto the ends of a 10m pole. A 40-kig player is at one end…

Q: Two girls, X and Y, are seated on identical skateboards on a smooth, horizontal surface. The masses…

A: When X pushes Y, From Newton's Third law of motion ,every action has equal and opposite…

Q: Two objects of equal mass m are hung on strings of the same length. its free-hanging position and…

Q: Just like the image below, assume you are holding a 15 lbs ball in your hand that is perpendicular…

A: Given that:Wb=15 lbsWh= 5 lbsdball=6 cmdbiceps=2cm

Q: Essay 1. v 30 cm- 40 cm 30 cm m2 0.075 0.050 4. Problem soiving with conservation of angular…

Q: 3) You are helping a patient to strengthen their hip flexors. Your patient is performing a hip…

A: Given data: The mass of a thing mt=15.6 m The mass of a shank ms=11.2 m The mass of a foot, mf=3.1…

Q: Let's say you hop on a see-saw with your little cousin. Your mass is 50 kg, and your cousin's is 25…

A: If you and your cousin each sit 3 meters from the fulcrum of the see-saw, the see-saw will balance…

Q: A 13-kg dog jumps up in the air to catch a ball. The dog's center of mass is normally 0.20 m above…

Q: Consider a vertical loop in the roller coaster ride shown in the figure. Suppose you are designing…

Q: monuniform horizontal bar of mass m is supported by two assless wires against gravity. The left wire…

A: Given:- A nonuniform horizontal bar of mass mmm is supported by two massless wires against gravity.…

Q: A 500 gram meter stick has a center of mass at the 50 cm mark. Using two fingers, one at the 10 cm…

A: In this question we are given that a 500 gram meter stick has a center of mass at the 50 cm mark.…

Q: An 800 gram meter stick has a center of mass at the 50 cm mark. Using two fingers, one at the 30 cm…

Q: A group of friends on a hike get tired and decide to ride a perfectly uniform 5-m log down a river…

A: Given,

Q: Four masses are attached to a light stick at different positions. 1.1 kg is attached at 20 cm, 2.7…

A: Center of mass of a system of particles is the point at which the whole system can be balanced. It…

Q: Determine the magnitude of moment of a force F=-40i+70j-40k (lb) about point A. Express your answer…

Q: the illustration below, the beam is 12 meters long and weighs 20N (positioned at its center of mass…

A: For equilibrium net force as well as net torque acting on the system must be zero and horizontal as…

Q: Three 92.4 g masses are connected in a triangular shape by massless rigid wires as shown in the…

A: Ycm=mXA+XB+XC3m=0+14.2+16.33 Ycm=10.167 cmYcm=mYA+YB+YC3m=0+22.5+15.43…

Q: Three masses are set on a board with negligible mass. The center of mass of m1, m2, and m3 are…

Q: Use g = 10 m/s/s in the following problems. An 800 gram meter stick has a center of mass at the 50…

Q: Calculate the force F2 shown in the figure below, so that the beam is in equilibrium in position…

Q: shaded figure below is a vertical section through a steel plate with thickness (in the z-direction)…

A: The value of y is y=bxnan. The area of cross section is A=∫x1x2ydx where A is the area, x1 and x2…

Q: This question is a biomechanics question and all that was given is this: Given a person with a body…

Q: Consider the system shown in the figure (Figure 1). The rope and pulley have negligible mass, and…

Q: the scale, the weight recorded by the scale is 58 er the scale, the scale reads 6500 N. The distan…

Q: Three 87.0 g masses are connected in a triangular shape by massless rigid wires as shown in the…

Q: Three 91.3 g masses are connected in a triangular shape by massless rigid wires as shown in the…

A: The x and y coordinates of the center of mass are xcm=10.83 and ycm=11.63…

Q: The three masses shown in Figure 1) are connected by massless, rigid rods. Figure B 200 g 10 cm 300…

Q: Find the mass and center of mass of the lamina bounded by the graphs of the equations for the given…

Q: A 55-kg woman and a 72-kg man sit at the opposite ends of a seesaw, 3.6 m long. Where is their…

A: Where,M is the total mass in a system

Q: A motorcycle/rider combination has a center of mass that is half a meter diagonally upward and in…

A: There are two forces action on the system, one is gravitational force along downward direction and…

Concept explainers

Rotational Equilibrium And Rotational Dynamics

In physics, the state of balance between the forces and the dynamics of motion is called the equilibrium state. The balance between various forces acting on a system in a rotational motion is called rotational equilibrium or rotational dynamics.

Equilibrium of Forces

The tension created on one body during push or pull is known as force.

Question

You are helping a patient to strengthen their hip flexors. Your patient is performing a hip flexion
exercise as illustrated below (assume knee in full extension). While he was standing, you
measured the distance from the hip joint to the center of mass of the thigh, shank and foot to be
0.32, 0.68, and 0.98m. The masses of his thigh, shank, and foot are 15.6, 11.2, and 3.1kg.
Calculate the amount of hip flexor muscle torque required to hold the leg isometrically at 35°
Foot, 0.98m from Hip
Shank, 0.68m from Hip
Thigh, 0.32m from Hip
Hip Joint
H

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

This is a popular solution!

SEE SOLUTION Check out a sample Q&A here

Step 1: Given data

VIEW

Step 2: Draw FBD of the system

VIEW

Step 3: Calculate amount of torque

VIEW

Solution

VIEW

Trending now

This is a popular solution!

Step by step

Solved in 4 steps with 8 images

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.

Similar questions

The forearm shown below is positioned at an angle with respect to the upper arm , and a 5.0- kg mass is held in the hand. The total mass of the forearm and hand is 3.0 kg, and their center of mass is 15.0 cm from the elbow. (a) What is the magnitude of the force that the biceps muscle exerts on the forearm for =60 ? (b) What is the magnitude of the force on the elbow joint for the same angle? (c) How do these forces depend on the angle ?
In order to get his car out of the mud, a man ties one end of a rope to the front bumper and the other end to a tee 15 m away as shown below. He then pulls on the center of the rope with a force of 400 N, which causes its center to be displaced 0.30 m, as shown. What is the force of the rope on the car?
If 1 of the Earth’s mass were transferred to the Moon, how far would the center of mass of the Earth-Moon-population system move? The mass of the Earth is 5.971024kg and that of the Moon is 7.341022kg . The radius of the Moon’s orbit is about 3.84105m .
(a) Calculate the magnitude and direction of the force on each foot of the horse in Figure 9.31 (two are on the ground), assuming the center of mass of the horse is midway between the feet. The total mass of the horse and rider is 500kg. (b) What is the minimum coefficient of friction between the hooves and ground? Note that the force exerted by the wall is horizontal.
A diver off the high board imparts an initial rotation with his body fully extended before going into a tuck and executing three back somersaults before hitting the water. If his moment of inertia before the tuck is 16.9kgm2 and after the tuck during the somersaults is 4.2kgm2 , what rotation rate must he impart to his body directly off the board and before the tuck if he takes 1.4 s to execute the somersaults before hitting the water?
You have been hired as an expert witness by an attorney for a trial involving a traffic accident. The attorneys client, the plaintiff in this case, was traveling castbound toward an intersection at 13.0 m/s as measured just before the accident by a roadside speed meter, and as seen by a trustworthy witness. As the plaintiff entered the intersection, his car was struck by a northbound driver, the defendant in this case, driving a car with identical mass to the plaintiffs. The vehicles stuck together after the collision and left parallel skid marks at an angle of = 55.0 north of east, as measured by accident investigators. The defendant is claiming that he was traveling within the 35-mi/h speed limit. What advice do you give to the attorney?
When tightening a bolt, you push perpendicularly on a wrench with a force of 165 N at a distance of 0.140 m from the center of the bolt. How much torque are you exerting in newton-meters (relative to the center of the bolt)?
Two metersticks are connected at their ends as shown in Figure P10.18. The center of mass of each individual meterstick is at its midpoint, and the mass of each meterstick is m. a. Where is the center of mass of the two-stick system as depicted in the figure, with the origin located at the intersection of the sticks? b. Can the two-stick system be balanced on the end of your finger so that it remains lying flat in front of you in the orientation shown? Why or why not? FIGURE P10.18 (a) The center of mass of the stick on the x axis would be at (0.5 m, 0), and the center of mass of the stick on the stick on the y axis be at (0, 0.5 m), assuming the sticks are uniform. We can then use Equation 10.3 to find the x and y coordinates of the center of mass. xCM=1Mj=1nmjxj=12m[m(0.50m)]=0.25myCM=1Mj=1nmjyj=12m[m(0.50m)]=0.25m The location of the center of mass is (0.25m,0.25m) (b) No. The location of the center of mass is not located on the object, so your finger would not be in contact with the object. In a different orientation, balancing by applying a force at the center of mass might be possible, but not in the orientation shown.
The uniform seesaw is balanced at its center of mass, as seen below. The smaller boy on the right has a mass of 40.0 kg. What is mass of his friend?
Under what conditions does a rigid body have angular momentum but not linear momentum?
Certain of dinosaurs were bipedal (walked on two legs). What at is a good reason that these creatures invariably had long tails if they had long necks?
A Small pickup truck that has a caliper shell slowly coasts toward a red light with negligible friction. Two dogs in the back of the truck are moving and making various inelastic collisions with each other and the walls. What is the effect of the dogs on the motion of the center of mass of the system (truck plus entire load)? What is their effect on the motion of the truck?