II. Workout the following problems 8. A vertical, solid steel post 25 cm in diameter and 2.50 m long is required to support a load of 8000 kg . You can ignore the weight of the post. What are (a) the stress in the post; (b) the strain in the post; a (c) the change in the post's length when the load is applied?

21. Blood flows at an average speed of \( 0.40 \mathrm{~m} / \mathrm{s} \) in a horizontal artery of radius 1.0 cm . The average pressure is \( 1.4 \times 10^{4} \mathrm{~N} / \mathrm{m}^{2} \) above atmospheric pressure (the gauge pressure). (a) What is the average speed of the blood past a constriction where the radius of the opening is 0.30 cm ? (b) What is the gauge pressure of the blood as it moves past the constriction?

11. The pressure in a water line is 1500 kPa . What is the line pressure in (a) torr units and (b) psi units? (c) atm units 12. How tall must a water-filled closed end manometer be to measure blood pressures as high as 300 mm Hg ?

Two forces act at a point the magnitude of the two forces 6,8 newton and the meas f the included angle between them \( \theta \in\left[0, \frac{\pi}{2}[\right. \), then the magnitude of their resul ould be equal \( \qquad \) newton. 5 (b) 10 (c) 12 (d) 16

Exercise 2: 1. Obtain the moment of inertia tensor of a thin uniform ring of radius R , and mass M, with the origin of the coordinate system placed at the center of the ring, and the ring lying in the xy plane. 2. Obtain the moment of inertia tensor of a uniform hollow sphere of radius R , and mass M , with the origin of the coordinate system placed at the center of the sphere. Note that this problem can be done by dividing the sphere into a large number of infinitesimally thin rings.

62 Un aereo deve distribuire dei pacchi di soccorso agli abitanti di un villaggio, mentre sta volando a \( 300 \mathrm{~km} / \mathrm{h} \) a una quota di \( 95,0 \mathrm{~m} \) da terra. A che distanza, in senso orizzontale, dal villaggio deve sganciare il suo carico, affinché cada esattamente sull'obiettivo?