Le foyer d'une chaudière, alimenté par du charbon, a un rendement de 75%. Ce foyer chauffe une chaudière contenant 1 m d'eau de 15 à 90°C à pression
normale.
a-Quelle est la masse du charbon utilisée ? Pouvoir calorifique du charbon est
8000 cal/g : c'est-à-dire que la combustion de 1 g de charbon fournit 8000 cal.
b- Calculer la puissance du foyer.
Solution :​

Select the correct answer.which scenario describes unethical lab behavior? o a. danny stores the chemicals required for his experiment in flasks and beakers.b.anna publishes the results of her experiment on the growth rate of saplings.c.jason repeatedly runs an experiment until he gets the results he desires.d. mia records her observations of an experiment precisely and accurately.

Abody cell has been growing and at synthesis proteins.in the nucleus of this body cell,dna replication is taking place. and a copy of the cells genetic material is copied.which of the following is the best conclusion you can make about the life cycle of this cell ? a) the cell is ready to undergo mitosis.and a chemical signal will send the cell to prophase b)the cell is undergoing meiosis and will cross over the genetic material next c)the cell is in the s phase of interphase and will move next to the g2 phase d) the cell is in the g2 phase of the interphase and is ready to begin diving

Which of these correctly describes the difference between processes that take place in prokaryotic and eukaryotic cells?