Hold your arm abducted to 90 degrees when standing. Which muscle holds your arm there? Type...
Hold your arm abducted to 90 degrees when standing.
Which muscle holds your arm there?
Type of contraction?
Homework Answers
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Hold your arm abducted to 90 degrees when
standing.
Which muscle holds your arm there?
Type...
When you hold your arm outstretched, it's supported primarily by the deltoid muscle.
When you hold your arm outstretched, it's supported primarily by the deltoid muscle. The given figure shows a case in which the deltoid exerts a 67 N force at 15 degrees to the horizontal. If the force-application point is 18 cm horizontally from the shoulder joint, what torque does the deltoid exert about the shoulder?
A person is sitting on a stage edge with their knee at 90 degrees (flexion). They...
A person is sitting on a stage edge with their knee at 90 degrees (flexion). They lower the leg to 10 degrees and holds in this position? what major muscle group is the agonist? What kind of muscle contraction happens by the agonist? Is it open or closed chain? does the type of contraction change if you add on weight?
You are able to hold your arm in an outstretched position because of the deltoid muscle....
You are able to hold your arm in an outstretched position
because of the deltoid muscle. The force diagram for this is shown
below. Assume that the weight of the humerus is 8 lb (with a center
of gravity as shown), and that the deltoid muscle makes an angle of
α = 18 degrees to the humerus.
What is the magnitude of the tension in the deltoid muscle? What
is the magnitude of the force F at the joint?
Deltoid...
Hold your upper arm vertical and your lower arm horizontal with your hand palm-down on a...
Hold your upper arm vertical and your lower arm horizontal with
your hand palm-down on a table, as shown in the figure. If you now
push down on the table, youll feel that your triceps muscle has
contracted and is trying to pivot your lower arm about the elbow
joint. If a person with the arm dimensions shown pushes down hard
with a 90 N force (about 20 lbs), what force must the triceps
muscle provide? You can ignore the...
Hold your upper arm vertical and your lower arm horizontal with your hand palm-down on a table, as shown in the figur...
Hold your upper arm vertical and your lower arm horizontal with
your hand palm-down on a table, as shown in the figure. If you now
push down on the table, youll feel that your triceps muscle has
contracted and is trying to pivot your lower arm about the elbow
joint. If a person with the arm dimensions shown pushes down hard
with a 90 N force (about 20 lbs), what force must the triceps
muscle provide? You can ignore the...
Part A Hold your upper arm vertical and your lower arm horizontal with your hand palm-down...
Part A Hold your upper arm vertical and your lower arm horizontal with your hand palm-down on a table, as shown in (Figure 1). If you now push down on the table, you'll feel that your triceps muscle has contracted and is trying to pivot your lower arm about the elbow joint. If a person with the arm dimensions shown pushes down hard with a 90 N force, what force must the triceps muscle provide? Ignore the mass of the...
Deltoid muscle Fig. 1a Problem #2.1 You are able to hold your arm in an outstretched...
Deltoid muscle Fig. 1a Problem #2.1 You are able to hold your arm in an outstretched position because of the deltoid muscle. The force diagram for this is shown in Fig. 1b. Use the equilibrium conditions to determine the tension T in the deltoid muscle needed to achieve this equilibrium, and the vertical and horizontal components of the force exerted by the scapula (shoulder blade)on the humerus. Assume the weight of the humerus is 36.0 N and the deltoid muscle...
You are able to hold out your arm in an outstretched horizontal position because of the action of the deltoid muscle. A...
You are able to hold out your arm in an outstretched horizontal position because of the action of the deltoid muscle. Assume the humerus bone has a mass M1=3.6kg, length L=0.66m and its center of mass is a distance L1=0.33m from the scapula. (For this problem ignore the rest of the arm.) The deltoid muscle attaches to the humerus a distance L2=0.15m from the scapula. The deltoid muscle makes an angle of ?=17? with the horizontal, as shown. (Figure 1)...
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...
When you lift an object by moving only your forearm, the main lifting muscle in your...
When you lift an object by moving only your forearm, the main lifting muscle in your arm is the biceps. Suppose the mass of a forearm is 1.40 kg .If the biceps is connected to the forearm a distance dbiceps = 3.50 cm from the elbow, how much force Fbiceps must the biceps exert to hold a 850 g ball at the end of the forearm at distance dball = 33.0 cmfrom the elbow, with the forearm parallel to the...
You are able to hold your arm in an outstretched position
because of the deltoid muscle. The force diagram for this is shown
below. Assume that the weight of the humerus is 8 lb (with a center
of gravity as shown), and that the deltoid muscle makes an angle of
α = 18 degrees to the humerus.
What is the magnitude of the tension in the deltoid muscle? What
is the magnitude of the force F at the joint?
Deltoid...
Hold your upper arm vertical and your lower arm horizontal with
your hand palm-down on a table, as shown in the figure. If you now
push down on the table, youll feel that your triceps muscle has
contracted and is trying to pivot your lower arm about the elbow
joint. If a person with the arm dimensions shown pushes down hard
with a 90 N force (about 20 lbs), what force must the triceps
muscle provide? You can ignore the...
Hold your upper arm vertical and your lower arm horizontal with
your hand palm-down on a table, as shown in the figure. If you now
push down on the table, youll feel that your triceps muscle has
contracted and is trying to pivot your lower arm about the elbow
joint. If a person with the arm dimensions shown pushes down hard
with a 90 N force (about 20 lbs), what force must the triceps
muscle provide? You can ignore the...
Part A Hold your upper arm vertical and your lower arm horizontal with your hand palm-down on a table, as shown in (Figure 1). If you now push down on the table, you'll feel that your triceps muscle has contracted and is trying to pivot your lower arm about the elbow joint. If a person with the arm dimensions shown pushes down hard with a 90 N force, what force must the triceps muscle provide? Ignore the mass of the...
Deltoid muscle Fig. 1a Problem #2.1 You are able to hold your arm in an outstretched position because of the deltoid muscle. The force diagram for this is shown in Fig. 1b. Use the equilibrium conditions to determine the tension T in the deltoid muscle needed to achieve this equilibrium, and the vertical and horizontal components of the force exerted by the scapula (shoulder blade)on the humerus. Assume the weight of the humerus is 36.0 N and the deltoid muscle...
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