Développées de b, c et d.
exercice n°6:
on réalise l'analyse d'un polymère obtenu par polyaddition. on constate qu'il contient, en
masse, 73,2% de chlore, 24,8% de carbone et 2% d'hydrogène.
1 quelle est la composition en masse du monomère m?
2 le polymère a une masse molaire moyenne de 121000 g. mol" et un degré de polymérisation
moyen de 1250. donner la formule brute de m.
3-indiquer toutes les formules développées possibles pour m.
6c
4-donner, dans chaque cas, le motif et le nom du polymère.
el
2019-2020
lycée de cettene ndo
prof: mohamed/sidelle
lycée d'excellence ndb

name

Two identical 82 mg dust particles very far apart (pee 0) are moving directly toward each other at a speed of 3698 m/s. the charge on each is-719 ? c. determine how close they will get to each other. let k = 9x109 n-m2/c2 & ignore gravity.

The ultracentrifuge is an important tool for separating and analyzing proteins. because of the enormous centripetal accelerations, the centrifuge must be carefully balanced, with each sample matched by a sample of identical mass on the opposite side. any difference in the masses of opposing samples creates a net force on the shaft of the rotor, potentially leading to a catastrophic failure of the apparatus. suppose a scientist makes a slight error in sample preparation and one sample has a mass 10 mg larger than the opposing sample. if the samples are 12 cm from the axis of the rotor and the ultracentrifuge spins at 70,000 rpm, what is the magnitude of the net force on the rotor due to the unbalanced samples? ( be thorough on your answer)

When a pair of 10-n forces act on a box of candy, the net force on the box is a 20 n. b about 14 n. c zero. d any of the above depending on the directions of forces.