Exercice 4 : On considère le dispositif ci-dessous (voir fig1). Un ressort de constante de raideur K=50N. m-1

est fixé en

A. Un solide de masse m=1Kg est accroché à l’extrémité B. L’axe du ressort est maintenu en équilibre suivant

la ligne de plus grande pente d’un plan incliné de α=45° par rapport au plan horizontal.

1- Représenter les forces qui s’exercent sur le solide (les frottements sont supposés nuls).

2- Déterminer les intensités de ces forces. Calculer la diminution de longueur x du ressort.

On reprend le dispositif précédent en le modifiant comme le montre la figure 2. Le fil est inextensible de

masse négligeable et passe sur la gorge d’une poulie (C).

3- Quelle doit être la valeur de m’ pour que le ressort ne soit ni allongé ni comprimé ?

The bubba chump shrimp company processes and packages shrimp for sale to wholesale seafood distributors. the shrimp are transported to the main plant by trucks that carry 1,000 pounds (lb) of shrimp. once the continuous flow processing of the shrimp begins, no inventory is allowed in buffers due to spoilage and all of the shrimp must be processed within 12 hours to prevent spoilage. the processing begins at the sorter, where the trucks dump the shrimp onto a conveyor belt that feeds into the sorter, which can sort up to 500 lb per hour. the shrimp then proceed to the desheller, which can process shrimp at the rate of 400 lb per hour. however, after 3 hours and 45 minutes of processing, the desheller must be stopped for 15 minutes to clean out empty shrimp shells that have accumulated. the veins of the shrimp are then removed in the deveining area at a maximum rate of 360 lb per hour. the shrimp proceed to the washing area, where they are processed at 750 lb per hour. finally, the shrimp are packaged and frozen. what is the daily process capacity of the processing plant (excluding the packaging and freezing)?

In the first law of thermodynamics, triangle e=q-w, what does q stand for

Asatellite component is in the shape of a cube with 10cm edges, has an evenly distributed mass of 2 kg and one bolt hole at each of four corners. if the maximum predicted random vibration environment is 10 grms, what bolt size would be a good choice for restraint? what other factors might drive bolt size besides force/stress?