A spider silk line has a circular cross section. Its diameter is 7.14 micrometers. Its unstretched length is 12cm and when a 1g spider hangs from it it stretches to 27cm. What is the Young's Modulus of the thread? Give your answer in MPa. Answer:
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- A man with a mass of 72.1 kg stands on one foot. His femur has a cross-sectional area of 8.00 cm2 and an uncompressed length 49.6 cm. Young’s modulus for compression of the human femur is 9.40 × 109 N/m2. A.) How much shorter is the femur when the man stands on one foot? B.)What is the fractional length change of the femur when the person moves from standing on two feet to standing on one foot?A solid copper cube has an edge length of 89.9 cm. How much stress must be applied to the cube to reduce the edge length to 89 cm? The bulk modulus of copper is 1.4 x 101¹ N/m². Number i 4.2 Units N/m^2 or PaDuring a tensile strength experiment, a small diameter fibre is elongated by a force of 0.0250 N. The fibre has an initial length of 0.200 m and stretches 4 x 102 m. Determine the diameter of the fibre? The Young's modulus for the material being tested is 7.60 x 1010 Pa.
- A man with a mass of 68.3 kg stands on one foot. His femur has a cross-sectional area of 8.00 cm2 and an uncompressed length 50.4 cm. Young’s modulus for compression of the human femur is 9.40 × 109 N/m2. What is the fractional length change of the femur when the person moves from standing on two feet to standing on one foot?Humans can bite with a force of approximately 796 N. If a human tooth has the Young's modulus of bone, a cross-sectional area of 1.1 cm2, and is 1.9 cm long, determine the change in the tooth's length during an 7.96 ✕ 102 N bite. mConsider a square-faced beam supporting a section of a building. a) Before installation, the length of the beam is found to be l0 = 15.02 m (figure a). After installation and construction, the length is remeasured and found to be l = 14.98 m (figure b). Determine Young's Modulus Y in N/m2 for the beam if it supports a mass m = 35000 kg and has a side length d = 1.9 m. b) Suppose that after the beam is installed it needs to be repaired. The weight it supports is removed and replaced with a new mass m2 (figure c). After the new mass is supported, the side length is remeasured and found to be larger with a difference of Δd. Assuming that this side length deformation is uniform and small, write an expression for determining Poisson's ratio v for this beam if its Young's modulus Y is known.
- B8The muscle fibers in muscle A have a pinnation angle of 25 degrees, while the muscle fibers in muscle B have a pinnation angle of 20 degrees.Two pennate muscles have the same cross sectional area and produce the same tensile stress. Which muscle can produce a greater amount of force? Muscle B Muscle A Muscle A and B produce the same force