True or false and explain why. In an isotonic contraction, skeletal muscles shorten to generate tension greater than the load so as to move the load, hence rate of contraction is directly proportional to the load.
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True or false and explain why. In an isotonic contraction, skeletal muscles shorten to generate tension greater than the load so as to move the load, hence rate of contraction is directly proportional to the load.
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- When using a pencil eraser, you exert a vertical force of 4.00 N at a distance of 2.00 cm from the hardwood-eraser joint. The pencil is 6.00 mm in diameter and is held at an angle of 12.0° to the horizontal. (Enter your answers in m.) (a) By how much does the wood flex perpendicular to its length? Xm (b) How much is it compressed lengthwise? XmThe stress-strain curve during elastic deformation is non-linear. Is this true or false?A rectangular timber tie 180 mm x 80 mm is reinforced by a bar of aluminium of 25 mm diameter. Calculate the stress in the timber and reinforcement when the tie carries an axial load of 300 KN. E for timber = 15 GN/m2 , E for aluminium = 90 GN/M2
- Triceps 14- 101 2.4 cm Muscles can only contract, so they occur in pairs. In the arm, the biceps muscle is a flexor-that is, it closes the limb. The triceps muscle is an extensor that opens the limb. This configuration is typical of skeletal muscles, bones, and joints in humans and other vertebrates. Most skeletal muscles exert much larger forces within the body than the limbs apply to the outside world. Imagine that a person is pushing down on a tabletop with their hand as shown in the figure. If the person applies a downward force of 70 N with their hand (thats about 16 lbs of force) what force does the triceps tendon exert on the lower arm? The unknown force is indicated by the red arrow in the figure. Ignore the weight of the arm in your calculation. O 5.6 N 70 N 280 N 875 N 30 cm 945 NIn some recent studies it has been shown that women are more susceptible to torn anterior cruciate ligaments, or ACLs, than men when competing in similar sports (most notably in soccer and basketball). Select the statement that explains why this disparity might exist. The ACL of women is more elastic than the ACL of men. The Young's modulus of women's ACLs is typically smaller than that of men's, resulting in more stress for the same amount of strain. The cross-sectional area of the ACL is typically larger in men, and therefore experiences less strain for the same tensile force and Young's modulus. The cross-sectional area of the ACL is typically smaller in women, and therefore experiences less stress for the same tensile force.Question 4 of 7 > A particular human hair has a Young's modulus of 3.64 × 10° N/m² and a diameter of 148 μm. If a 217 g object is suspended by the single strand of hair that is originally 15.5 cm long, by how much AL hair will the hair stretch? If the same object were hung from an aluminum wire of the same dimensions as the hair, by how much ALAI would the aluminum stretch? If the strand of hair is modeled as a spring, what is its spring constant khair? AL hair ALAI = Khair = m N/m Question Source: Freedman College Physics 3e | Publisher: Mac
- 6-34. The Howe truss is subjected to the loading shown. Determine the force in members GH, BC, and BG of the truss and state if the members are in tension or compression. 5 kN G 5 kN 5 kN 3 m H F 2 kN 2 kN E B |C |D -2 m- -2 m- -2 m- -2 m-A woman is standing erect and with her elbow flexed 90°. She has an 80 N load in her hand and it has a 0.25 m lever arm to the elbow. Her biceps creates 800 N of force and it has a 0.02 m lever arm to the elbow. The type of contraction in the biceps is: Group of answer choices concentric isometric really big eccentricAssume a human leg contains a 50cm long bone with an average cross section of 3cm. By how much (in micrometres) does the bone shorten when the entire body weight of the person is supported by that one leg. The body weight is 700N and the Young's modulus for bone is 1.8 x 1010 Pa Answer:
- A tutor told me that the answer to 1b was 10N but I don't understand why it would be 10N for the tension. If that is correct could someone break it down for me?Remember to show all work Fp For the glenohumeral joint shown above, there are two muscle force: F, (deltoid) and Fs (supraspinatus) with values as follows: Fp = 400 N acting at an angle of 10 degrees with respect to vertical Fs= 200 N acting at an angle of 25 degrees with respect to horizontal a) By adding these force vectors, solve for the net force acting on the glenohumeral joint (magnitude). The opposite of this net force is referred to as the joint reaction force. b) What is the predominant orientation of this joint reaction force (ie, superior, inferior, medial, lateral, anterior or posterior)? c) What shoulder muscle might be able to counterbalance this force? Your text from your A&P course will be helpful here.When picking up an object from the ground, it is generally recommended that you "lift with your legs" - that is, raise and lower yourself by bending your knees but keeping your upper body upright. If instead, you "lift with your back" by bending at the hip so that your upper body is angled, then you put a great deal more stress on your spine and back muscles. Consider a person who is "lifting with their back" such that they are bent at the hip with their upper body is parallel to the ground (i.e., their spine is oriented horizontally). Let us calculate the tension in the back muscles and the compression on the spine in this situation. We will model the spine and upper body as a horizontal rigid rod or uniform density with a length of 50.0 cm and a mass of 40.0 kg. Assume that the person attempts to lift an object with their arms, which we will model as attached at the far end of the rod. Support of the back in this position is provided primarily by the erector spinalis muscle which we…