Steven's biceps muscle inserts at a spot 3 cm from his elbow joint, and the center of his hand is...
Steven's biceps muscle inserts at a spot 3 cm from his elbow joint, and the center of his hand is 33 cm from the spot where the biceps inserts. If Steven flexes his arm (contracting his biceps), what is the value of...
1. The length of the 'in lever' (in cm)?
2. The length of the 'out lever' (the part of the lever system that moves) (in cm)?
3. If Steven lifts a 12 kg bowling ball, how much tension will his biceps generate? Give your answer in kg
Homework Answers
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Steven's biceps muscle inserts at a spot 3 cm from his elbow joint, and the center of his hand is...
Dan's biceps muscle has a moment arm about the elbow joint of 0.011 m when the...
Dan's biceps muscle has a moment arm about the elbow joint of 0.011 m when the joint is held at a joint angle of 90 degrees and can produce a force of 526 N. His forearm is 0.24 m from the elbow joint center to the center of his hand where he grips a handle. His forearm has a mass of 1.2 kg and the center of mass is located directly above the elbow joint. How much force can he...
To develop muscle tone, a woman lifts a 4.50 kg weight held in her hand. She...
To develop muscle tone, a woman lifts a 4.50 kg weight held in her hand. She uses her biceps muscle to flex the lower arm through an angle of 60.0°. a) What is the angular acceleration (in rad/s2) if the weight is 24.0 cm from the elbow joint, her forearm has a moment of inertia of 0.250 kg · m2, and the net force she exerts is 500 N at an effective perpendicular lever arm of 2.20 cm? (Ignore gravity)...
A patient rests their hand on a scale 31 cm anterior from the joint center at...
A patient rests their hand on a scale 31 cm anterior from the joint center at the elbow. The weight of the forearm and hand is 44 N with the hand/forearm Center of Gravity located 18 cm from the elbow joint center. The reading on the scale is 30 N. Draw a Net torque free body diagram that will allow you to determine whether the biceps (elbow flexors) or triceps (elbow extensors) are active. b) Calculate the torque produced by...
How much force (in N) must the biceps muscle exert when a 25.0 kg mass is...
How much force (in N) must the biceps muscle exert when a 25.0 kg mass is held in the hand in a stationary position when the arm is 17.4° below the horizontal? Assume the mass of the forearm is 2.46 kg. Distances relative to the elbow joint are reb = 5.12 cm; recg = 16.5 cm; ren = 37.5 cm where the distances are: eb = elbow—biceps; ecg = elbow—forearm center of gravity; eh = elbow-hand. A marble column 0.890...
1a) Consider the elbow joint pictured. Given that the muscle connection distance is d=1.29 cm and...
1a) Consider the elbow joint pictured. Given that the muscle connection distance is d=1.29 cm and the barbell mass is M=7.0 kg, find the muscle tension force? 3552 ✓N muscle tension F E distance d barbel in hand 555cm long, 3 kg rod b) What is the rotational inertia of the arm/barbell system? 2.42 kgm? c) If the arm begins at rest and accelerates through 45° in 303 millseconds, find the angular acceleration: rad/s2 Check d) What muscle tension will...
Bone at 0.04 m from the center of rotation at the elbow joint, to statically support a dumbbell o...
bone at 0.04 m from the center of rotation at the elbow joint, to statically support a dumbbell of 100 N held in the hand at a distance of 0.25 m from the elbow joint, with the forearm held at an angle of 45 from vertical (see diagram below)? The forearm-hand system has a mass of 2.9 kg with a COG 0.14 m from the elbow joint. (Neglect any action of other muscles). Hint: Round intermediate values to 4 decimal...
2. Bill is holding a 12 kg barbell in his hand. His upper arm is perpendicular...
2. Bill is holding a 12 kg barbell in his hand. His upper arm is perpendicular to the ground, and his elbow is flexed to produce a 40º angle at the elbow joint. His forearm has a mass of 12 kg. The distance from the elbow joint to the weight in his hand is 35 cm. The center of mass (COM) of his forearm is located 14 cm from the elbow joint. Draw a free body diagram of this scenario....
A person holds a 1.26 N baseball in his hand, a distance of 34.0 cm from...
A person holds a 1.26 N
baseball in his hand, a distance of 34.0 cm from the elbow joint,
as shown in the figure(Figure 1). The biceps, attached at a
distance of 2.75 cm from the elbow, exerts an upward force on the
forearm. Consider the forearm and hand to be a uniform rod with a
mass of 1.40 kg . Suppose the biceps exert just enough upward force
to keep the system in static equilibrium.
< Homework Assignment #11...
An athlete at the gym holds a 2.5 kg steel ball in his hand. His arm is 60 cm long and has a mass of 3.6 kg. Assume the center of mass of the arm is at the geometrical center of the arm.
An athlete at the gym holds a 2.5 kg steel ball in his hand. His arm is 60 cm long and has a mass of 3.6 kg. Assume the center of mass of the arm is at the geometrical center of the arm. Part A What is the magnitude of the torque about his shoulder due to the weight of the ball and his arm if he holds his arm straight out to his side, parallel to the floor? Part B What is the...
1. Kinetics is the study of forces acting on a system. True False 2. Kinematics is...
1. Kinetics is the study of forces acting on a system.
True
False
2. Kinematics is the study of motion without regard to its
causes (forces).
True
False
3. The similarity between the Macrocycle Flowchart, the Training
Pyramid and the Goals for Performance pyramid can be best described
as an athlete should have a structured foundation and not proceed
too early.
True
False
4. When should static stretching be performed?
Minutes before event performance
Hours prior to event or the...
How much force (in N) must the biceps muscle exert when a 25.0 kg mass is held in the hand in a stationary position when the arm is 17.4° below the horizontal? Assume the mass of the forearm is 2.46 kg. Distances relative to the elbow joint are reb = 5.12 cm; recg = 16.5 cm; ren = 37.5 cm where the distances are: eb = elbow—biceps; ecg = elbow—forearm center of gravity; eh = elbow-hand. A marble column 0.890...
1a) Consider the elbow joint pictured. Given that the muscle connection distance is d=1.29 cm and the barbell mass is M=7.0 kg, find the muscle tension force? 3552 ✓N muscle tension F E distance d barbel in hand 555cm long, 3 kg rod b) What is the rotational inertia of the arm/barbell system? 2.42 kgm? c) If the arm begins at rest and accelerates through 45° in 303 millseconds, find the angular acceleration: rad/s2 Check d) What muscle tension will...
bone at 0.04 m from the center of rotation at the elbow joint, to statically support a dumbbell of 100 N held in the hand at a distance of 0.25 m from the elbow joint, with the forearm held at an angle of 45 from vertical (see diagram below)? The forearm-hand system has a mass of 2.9 kg with a COG 0.14 m from the elbow joint. (Neglect any action of other muscles). Hint: Round intermediate values to 4 decimal...
A person holds a 1.26 N
baseball in his hand, a distance of 34.0 cm from the elbow joint,
as shown in the figure(Figure 1). The biceps, attached at a
distance of 2.75 cm from the elbow, exerts an upward force on the
forearm. Consider the forearm and hand to be a uniform rod with a
mass of 1.40 kg . Suppose the biceps exert just enough upward force
to keep the system in static equilibrium.
< Homework Assignment #11...
1. Kinetics is the study of forces acting on a system.
True
False
2. Kinematics is the study of motion without regard to its
causes (forces).
True
False
3. The similarity between the Macrocycle Flowchart, the Training
Pyramid and the Goals for Performance pyramid can be best described
as an athlete should have a structured foundation and not proceed
too early.
True
False
4. When should static stretching be performed?
Minutes before event performance
Hours prior to event or the...
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