Question

Please help me finding the answers for these Multiple choice

If material "A" stretches 20% when a very small tensile stress is applied and material "B" stretches 1% when the same tensile stress is applied the elastic modulus (intrinsic stiffness) is higher for material "A" than for material "B" the elastic modulus (intrinsic stiffness) is higher for material "B" than for material "A" this tells us nothing about intrinsic stiffness extensibility is higher for material "B" than for material "A" Which of the following is NOT true about stretched samples of identical materials? All the stretched samples will break at the same absolute change in length All the stretched samples will break at the same stress If the stress-strain curves of all the samples were plotted, the initial slopes would all be the same All the samples would have the same Young's modulus (E), regardless of sample length or cross-sectional area Which of the following athletes is likely to have leg muscles with the lowest proportion of slow oxidative cells? long-distance runner sprinter rock climber Tour de France competitor If vertebrate skeletal muscles "A" and "B" (at right, both relaxed) have the same mass and volume, which of the following is FALSE: "B" has more sarcomeres in parallel than "A" "A" will generate less force than "B" During contraction, length of "A" will change less than length of "B" "A" has more sarcomeres in series than "B" does If a lever system has a force advantage greater than 1 it can't be a Class 2 lever (i.e., like a wheelbarrow) it can't be a Class 1 lever (i.e., like a seesaw) it can't be a Class 3 lever (i.e., like salad tongs) it could be a Class 1, Class 2, or Class 3 lever, depending on how far from the center the fulcrum is positioned When troponin binds calcium troponin's conformation changes a change in the conformation of troponin leads to a change in the conformation of tropomyosin a change in the conformation of troponin leads to the exposure of myosin binding sites on the actin strands All of the above are true

Answer 1

1. Answer - Option B. The intrinsic stiffnes for material B is higher than A

2. Answer - Option A. All the stressed sample will break at absolute length

3. Answer - Option C - rock climber

4. Answer - Option B

5. Answer - Option A

6. Answer - Option D - All the above statements are true.