Question

Use gravitational acceleration, g = 9.81 m s-² 1. If it takes 4.00 of work to stretch a spring 10.0 cm from its initial length, determine the extra work required to stretch it an additional 10.0 cm. ANS.: 12.0 J 2. A book of mass 0.250 kg is placed on top of a light vertical spring of force constant 5000 N m-¹ that is compressed by 10.0 cm. If the spring is released, calculate the height of the book rise from its initial position. ANS.: 10.2 m 3. A 60 kg bungee jumper jumps from a bridge. She is tied to a bungee cord that is 12 m long when unstretched and falls a total distance of 31 m. Calculate a. the spring constant of the bungee cord. b. the maximum acceleration experienced by the jumper. ANS.: 100 N m¹; 22 m s2 4. A spring is suspended vertically with a load of 0.8 kg from a retort stand. The spring will extend by 20.0 cm if a force of 15.0 N is applied at its end. Calculate a) The maximum extension produced by the load, 0.8 kg b) The potential energy stored in the spring at the maximum extension ANS.: x= 10.5 cm; E= 0.41 J 50​

Answer 1

Quelques citations à me conseiller pour le concours général de philo ?

Précisément, j'aimerais me faire une base de citations de philosophes de Grèce Antique (Y compris des philosophes pré-socratiques comme Parmenides). Mais j'accepte aussi les citations d'autres époques, ça m'aiderait de pouvoir couvrir les thématiques essentielles qui ont vues le jour plus tard (et qui ont marqué l'évolution de la philo surtout).