Larger animals have sturdier bones than smaller animals. A mouse's skeleton is only a few percent of its body weight, compared to 16% for an elephant. To see why this must be so, recall, that the stress on the femur for a man standing on one leg is 1.4% of the bone's tensile strength. Suppose we scale this man up by a factor of 10 in all dimensions, keeping the same body proportions. (Assume that a 70 person has a femur with a cross-section area (of the cortical bone) of , a typical value.)
a. Both the inside and outside diameter of the femur, the region of cortical bone, will increase by a factor of 10. What will be the new cross-section area?
b. The man's body will increase by a factor of 10 in each dimension. What will be his new mass?
c. If the scaled-up man now stands on one leg, what fraction of the tensile strength is the stress on the femur?
Answers: 2
Other questions on the subject: Physics
Physics, 22.06.2019 01:30, chloe1107
Which explanation describes the forces involved for a person to walk down the sidewalk? a. the person's feet push backward on the sidewalk; the sidewalk pushes backward on the person. b. the person's feet push forward on the sidewalk; the sidewalk does not push on the person. c. the person's feet push backward on the sidewalk; the sidewalk pushes forward on the person. d. the person's feet push forward on the sidewalk; the sidewalk pushes forward on the person.
Answers: 1
Physics, 22.06.2019 18:30, bubblzthechicken
Asmall grinding wheel has a moment of inertia of 4.0×10−5 kg⋅m2 . what net torque must be applied to the wheel for its angular acceleration to be 150 rad/s2 ?
Answers: 3
Do you know the correct answer?
Larger animals have sturdier bones than smaller animals. A mouse's skeleton is only a few percent of...
Questions in other subjects:
Chemistry, 19.10.2020 23:01
Computers and Technology, 19.10.2020 23:01
Social Studies, 19.10.2020 23:01
Advanced Placement (AP), 19.10.2020 23:01
Mathematics, 19.10.2020 23:01
Mathematics, 19.10.2020 23:01
