Exercice 1: On con sidère le système {corps C; fil OA} :
1) Représenter la force F exercée par le fil OA sur le corps C;
2) Représenter la force T exercée par le support sur le fil OA ;
3) représenter la force R exercée par le plan incliné sur le corps C;
4-) Représenter le poids : P du corps C;
5) Mettre une croix (X) dans la case correspondante :
Force de
contact
localisée
Force de
contact
répartir
Force à
distance
Force
intérieure
1 LIRITA

Wo small variable-thrust jets are actuated to keep the spacecraft angular velocity about the z-axis constant at ? 0 = 1.16 rad/s as the two telescoping booms are extended from r1 = 1.18 m to r2 = 4.69 m at a constant rate over a period of 124 seconds. the small 19-kg experiment modules at the ends of the booms may be treated as particles, and the mass of the rigid booms is negligible. determine the necessary thrust t for each jet as a function of time where t = 0 is the time when the telescoping action is begun. after you have the general expression for t, answer the questions. show work.

Which of the following is part of the explanation or description of electromagnetic waves? (select all that apply) a. electrically charged molecules in a medium transfer their energy to nearby electrically charged molecules. b. a changing electric field causes a changing magnetic field. c. magnetic molecules in a medium transfer their energy to nearby magnetic molecules. d. a changing magnetic field causes a changing electric field.

The molecular mass of a gas is (select all that apply) a. independent of the type of gas b. the same number as the atomic (or molecular) mass, but measured in grams c. dependent on the temperature d. the mass of a mole of the gas