11 Masse volumique du polystyrène
Le polystyrène est un matériau plastique
transparent dont...
Physics, 19.10.2021 21:10 irabrooks14
11 Masse volumique du polystyrène
Le polystyrène est un matériau plastique
transparent dont on fait par exemple
certains gobelets. Si l'on y souffle
un gaz lors de sa fabrication, on
obtient du polystyrène expansé,
sous forme de boules blanches.
1. La boule de polystyrène expansé
de la photographie a un diamètre de
12 cm. Calculer son volume.
2. La masse de cette boule est de 14 g.
Calculer la masse volumique du polystyrène expansé.
3. Si l'on immerge totalement un gobelet en polystyrène
dans l'eau, il coule. Est-ce que, comme lui, cette boule
coulerait ? Justifier.
Answers: 2
Physics, 22.06.2019 07:40, Alex9089435028
Astudent creates a model of a closed ecosystem by filling a glass tank half full with water, then adding 10 snails and two small aquatic plants. the next day, all the snails are dead. what is the most likely cause of their death?
Answers: 3
Physics, 22.06.2019 09:00, bendmads04
In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j? 1. write the equation 2.list out your known variables 3.plug the numbers into the equations 4.solve 5.write your solution statement that includes initial energy and final
Answers: 1
Physics, 22.06.2019 16:00, taylorbug6161
From the perspective of an employee that effective channeling of work related information and concerns
Answers: 1
Physics, 22.06.2019 17:20, Queenhagar
In a system with only a single force acting upon a body, what is the relationship between the change in kinetic energy and the work done by the force? answers: work is equal to the change in kinetic energy. work depends on the square of the change in potential energy. work is equal to the negative of the change in kinetic energy. work is equal to the square of the change in kinetic energy
Answers: 2
Computers and Technology, 14.04.2020 19:02