Bonjour à tous, excusez-moi de vous déranger une semaine de fêtes mais seulement voilà j'ai un problème je dois rendre un dm avant le 26 décembre et j'ai commencé le 22 décembre et il se trouve que je bloque à l'exercice 4, je ne comprend pas et j'aurais besoin de votre aide et votre bienveillance svp. Pourriez-vous m'aider pour l'exercice 4. Mécanisme ci-dessous ( PJ).
C'est de la mécanique en physique ( Moments, vecteurs, PFD, PFS, etc... )
Merci de votre aide et j'en vous en serez énormément reconnaissant. Bonne journée :)

How is acceleration calculated? a. initial velocity - final velocity / timeb. initial velocity + final velocity / timec. final velocity - initial velocity / timed. final velocity / timele select the best answer from the choices provided0oood00save and exitnextmark this and return

Suppose you have a box. which of these is not necessarily a true statement regarding the relationship between the force applied to the box, the work done on the box, and the distance the box is moved? a. if the box is not moved, no force is being applied to the box. b. if no force is applied to the box, no work is done on the box. c. if work is done on the box, then a force is applied to the box. d. if work is done on the box, then the box is moved a distance.

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)