Assuming the lower arm has a mass of 2.8 kg and its CG is 12 cm from the elbow-joint pivot
Assuming the lower arm has a mass of 2.8 kg and its CG is 12 cm
from the elbow-joint pivot, how much force must the extensor muscle
in the upper arm exert on the lower arm to hold a 7.5 kg shot put
(Fig. 12-7)?
| | 1000 N | |
| | 1500 N | |
| | 100 N | |
| | 500 N | |
| | 750 |
Homework Answers
Ok....So lets do the sum of the forces about the elbow
joint.
Fm = Force of Muscle;
Fe = Force Elbow; Fb = Force
Ball
Sum Force about Joint = (-2.5)Fm + 12Fe + 30Fb = 0
(-2.5)Fm + 12(2.8) + 30(7.5) = 0
Fm = 103.44kg
Fm = 103.44 * 9.8 =1013.71N ROUND ABOUT
Do you understand why the -2.5 is negative?
Because I put the origin at the joint. So when you go left it is
negative and when you go right it is positive.
the force needed is
F = (m1 + m2) x g
where m1 = 2.8 kg,m2 = 7.5 kg and g = 9.8 m/s^2
Add Answer to:
Assuming the lower arm has a mass of 2.8 kg and its CG is 12 cm from the elbow-joint pivot
FIGURE 12-7 2.5 cm 30.0 cm Elbow joint 21) Assuming the lower arm has a mass...
FIGURE 12-7 2.5 cm 30.0 cm Elbow joint 21) Assuming the lower arm has a mass of 2.8 kg and its CG is 12 cm from the elbow-joint pivot,21 how much force must the extensor muscle in the upper arm exert on the lower arm to hold a 7.5 kg shot put (Fig. 12-7)? E) 1000 N D) 100 N C) 500 N B) 1500 N A) 750 N .80
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18. Assuming the lower arm has a mass of 2.8 kg and its center of gravity is 12 cm from the elbow-joint pivot, how much force must the extensor muscle in the upper arm exert on the lower arm to hold a 7.5 kg shot put? 2.5 cm 0 cm- Elbow joint A) 100 N B)500 N C)750 N D) 1000 N E)1500 N 19. A boy and a girl are riding on a merry-go-round that is turning. The...
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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...
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FIGURE 12-7 2.5 cm 30.0 cm Elbow joint 21) Assuming the lower arm has a mass of 2.8 kg and its CG is 12 cm from the elbow-joint pivot,21 how much force must the extensor muscle in the upper arm exert on the lower arm to hold a 7.5 kg shot put (Fig. 12-7)? E) 1000 N D) 100 N C) 500 N B) 1500 N A) 750 N .80
help
18. Assuming the lower arm has a mass of 2.8 kg and its center of gravity is 12 cm from the elbow-joint pivot, how much force must the extensor muscle in the upper arm exert on the lower arm to hold a 7.5 kg shot put? 2.5 cm 0 cm- Elbow joint A) 100 N B)500 N C)750 N D) 1000 N E)1500 N 19. A boy and a girl are riding on a merry-go-round that is turning. The...
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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...
Constants A 71.0 kg weight lifter is doing arm raises using a 7.50 kg weight in her hand. Her arm pivots around the elbow joint, starting 40.0 below the horizontal. (See the figure(Figure 1).) Biometric measurements have shown that both forearms and the hands together account for 6.40 % of a person's weight. Since the upper arm is held vertically, the biceps muscle always acts vertically and is attached to the bones of the forearm 5.50 cm from the elbow...
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