PSL301H1 Lecture : Lec 2

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15 Dec 2011

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So the real system looks more like this: (cid:131) the outer surface of the lungs is covered by a pleural membrane as is the inner surface of the thoracic cavity. January 09, 2008: if move chest wall out and diaphragm down, the lung volume must expand because the volume in intrapleural space cannot change. Pneumothorax (cid:131) an accidental puncture of the chest wall (e. g. knife wound) can allow air to enter the intrapleural space. This condition is known as a pneumothorax (air = pneumo inside the thorax), and illustrates a further point about pulmonary mechanics. How do we specify the elastic properties of the lungs? (cid:131) suppose that we tested the elastic properties of the lungs in an experiment on the lungs alone, out of the thoracic cavity: Divisions of lung air, ventilation rates (cid:131) note: to expand the lung volume, the intrapleural pressure decreases below atmospheric pressure (becomes more.

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A small body rests on a horizontal diaphragm of a loudspeaker which is supplies with an alternating current of constant amplitude but variable frequency. If diaphragm executes simple harmonic oscillation in the vertical direction of amplitude 10 micro-metres, at all frequencies, find the greatest frequency for which the small body stays in contact with the diaphragm.

A 5 kg mass lies on a horizontal table. It is connected by arope and pulley to a 3 kg mass which is hanging over the table.Thefriction and mass of the pulley can be neglected in thisproblem.

a) When the system is set into downward motion, it descends with aconstant speed of 1.00 m/s. What is the coefficient of kineticfriction between m1 and the table?

b) In part a), for each of the following forces :-
(i) gravity, (ii) tension in the string (iii) friction and (iv) thenormal force, how much work is done on block m1 in a 10.0 s timeinterval?

c) Repeat b) for m2

d) Find the total work done on each block.

e) ) If the mass of m1 is doubled and the system is again set intomotion with a downward speed of 1.1 m/s, what is its acceleration(magnitude and direction)?

To measure the effective coefficient of friction in a bone joint, ahealthy joint (and its immediate surroundings) can be removed froma fresh cadaver. The joint is inverted, and a weight is used toapply a downward force on the head of the femur into the hipsocket. Then, a horizontal force is applied and increased inmagnitude until the femur head rotates clockwise in the socket. Thejoint is mounted in such a way that will cause clockwise rotation,not straight-line motion to the right. The friction force willpoint in a direction to oppose this rotation.

Draw vectors indicating the normal force (magnitude and direction)and the frictional force (direction only) acting on the femur headat point A.
Assume that the weight of the femur is negligible compared to theapplied downward force.

PSL301H1 Lecture : Lec 2

PSL301H1 Full Course Notes

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