Why does a man with a large belly or a woman in her last trimester of pregnancy tend to lean backward when walking?

Assume Young’s modulus for bone is 1.40×1010 N/m2 . The bone breaks if stress greater than 1.50 × 109 N/m2 is imposed on it. (i) What is the maximum force that can be exerted on the femur bone in the leg if it has a minimum effective diameter of 2.50 cm? (ii) If this much force is applied compressively, by how much does the 20.0 cm long bone shorten?

The simple truss is loaded by a system of forces as shown in the figure. The truss is supported by a pin at D and a roller at C. IfP= 800 lb, then the force developed in the member (FE) is. 500 lb 3 ft -3 ft- E DI 31- 3 ft VP Select one: Oa 1200 ib- Tension 05 1000 16 - Compression O C 2100 lb-Tension Cd 1020 lb- Compression

Explain the Stability of Columns.

If you are caught outdoors in a thunderstorm, why should you not stand under a tree? Can you think of a reason why you should not stand with your legs far apart? Or why lying down can be dangerous? (

Why should the shear stress acting on the element be directed tangent to the boundary?

The 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

In an emergency situation, a person with a broken forearm ties a strap from his hand to clip on his shoulder as in the figure below. His 1.60-kg forearm remains in a horizontal position and the strap makes an angle of ? = 47.0° with the horizontal. Assume the forearm is uniform, has a length of ℓ = 0.332 m, assume the biceps muscle is relaxed, and ignore the mass and length of the hand. A person with a broken left forearm faces out of the page. His left forearm is approximately horizontal, and a strap extends from a clip on his right shoulder to a position on his left arm that is a distance ℓ from the elbow. The strap is at an angle ? above the forearm. A force vector R acts up and to the right on the left forearm at a location just left of the elbow. (a) Find the tension in the strap.  N(b) Find the components of the reaction force exerted by the humerus on the forearm. (Assume the positive x-direction is to the right and the positive y-direction is upward.) Rx =  N Ry= N

A force stretches a (first) wire by 2mm. This wire is made of an unknown material and has a 1.2cm diameter and 3.5cm length. A second wire of the same material has the same length but four times the diameteras the first. How far will it be stretched by the same force?