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I.MCP.5.A.

Dans la région de Prétoria (Afrique du Sud) (28°
                                                                                     r=2m
longitude ouest, 23° latitude sud), le diamant extrait
dans le sous-sol est remonté par l'intermédiaire d'un
monte-charge. Pour ce faire, le monte-charge est relié à
un câble bobiné sur une roue ( r  2 m ). La roue suit la
loi de rotation suivante, lors de la descente du monte-
charge :
étape 1 :     départ à l'altitude de 5 m au-dessus de O1;
                                                                             z1
              accélération   4 rad s 2 ;
étape 2 :     vitesse constante à partir de l'altitude de       ouest                  y1     est
                                                                             O1
              0 m;
étape 3 :     freinage à partir de la profondeur
               z1   300 m , avec   4 rad s 2 .
L'axe de la roue est dirigé Nord-Sud. L'axe O1z1 est
dirigé suivant la verticale locale.
Déterminer :
a) vitesse et accélération aux trois stades de la descente;
b) le déplacement par rapport à O1z1, dû à l'effet de
   Coriolis, lorsque le monte-charge arrive au fond du
   puits.
c) Dans cette région du globe, estimer l'obliquité entre la verticale locale et la normale à !a surface
   terrestre.
Renseignements complémentaires : g local  9.79 m s 2 ; rterre  6370 km .

Bon travail !
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Pretoria I Solution

  • 1. I.MCP.5.A. Dans la région de Prétoria (Afrique du Sud) (28° r=2m longitude ouest, 23° latitude sud), le diamant extrait dans le sous-sol est remonté par l'intermédiaire d'un monte-charge. Pour ce faire, le monte-charge est relié à un câble bobiné sur une roue ( r  2 m ). La roue suit la loi de rotation suivante, lors de la descente du monte- charge : étape 1 : départ à l'altitude de 5 m au-dessus de O1; z1 accélération   4 rad s 2 ; étape 2 : vitesse constante à partir de l'altitude de ouest y1 est O1 0 m; étape 3 : freinage à partir de la profondeur z1   300 m , avec   4 rad s 2 . L'axe de la roue est dirigé Nord-Sud. L'axe O1z1 est dirigé suivant la verticale locale. Déterminer : a) vitesse et accélération aux trois stades de la descente; b) le déplacement par rapport à O1z1, dû à l'effet de Coriolis, lorsque le monte-charge arrive au fond du puits. c) Dans cette région du globe, estimer l'obliquité entre la verticale locale et la normale à !a surface terrestre. Renseignements complémentaires : g local  9.79 m s 2 ; rterre  6370 km . Bon travail !
  • 2. tt: fn, 7r Ë)/ OuÉsf {h J v7 A ,rl 3quot; /;i:L?quot;quot;k ,i:;1quot;' quot;#ro, /,'rn , ff, /,r, ,i, A tquot;**quot;îi!*'rjquot;:ir/enf ^/o't !. / !, nra.i t2,- luiy't^l - / !,2 (rt =4quot;) 2,21n /z : (42 2 h r 3îoo e'^ rl y ' euP e,^ ùiquot; : Ç ,r é, =4.trl/oz .-le E/a < /,,on ti^ ( ,,( or:r/:rt /,tu !uir,^/ /@ lr) J^ = D,'ro, = -hxl '- 8quot;quot;'xt/^z ='€,t .=,) ll î ,. sl +ft I z, a/r+ c a -vt'*i (r' 'fn ) /'t j0 7 =) l, I t û,5 q L/a 2/,rn Qm , =o =) /=(r24 zt z -) ,): _i ù: !ù:^/; t;'t 2 I o r quot;,quot; h hr *,quot; h I-Yquot;ût^v gé I t ( - .t) ti l o o 'gsr ) ( il^ r u:>Y) 16 I ':-i *p = /' oa -' 4 o l t o - 3( -) IY' @ *fi /)i, = 4olro-tt% ly, = 4quot;?,oquot;t*7r+ff @
  • 3. /'4rta I ! - 9.ûU,^1o ' Y: e , - 49v {2, 4 sç/ +ft i lt, 33-î(o. , j> I 1 . lsn pou't- ,-) ,i: /;: -) 2;; =f /x, Ay'nn :) I -Lù. '^( l-,!. ,, f ù l i (' f +(- {ot) I l o ,y]t -= +*? t*t> t7 t?, SU ,-3 t . t î 6 /o /!, - ^3 . 5; : /n''m,,n,t /o 4r96 :) ls, 2 * (r, quot;? ro'3 Jri06/o-5I 54,t1'/z') t ) I r 6 G r quot; - t i Z , *l'zeJ io-3 ,re)Z Q ? ]Y, to^3 (,rz)7/6 *(,,o! ) (*t; ëa €a=8 = t/'t^'n@ ; ': r cF 9/ l=': g/ g,4,î lz, . tZ 3*, g , S ' ,/ - ett I Ù L)V t. /''^quot;4 trll4 =)> = 3oi = 71 /.1 .
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