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 :​

Environmental differences within ecosystems are generally caused by

Which statement best describes a typical difference that could be found between the “analysis” and “conclusion” sections of a lab report?

98 points you will be galileo perform the experiment to determine if objects with different mass fall at the same, or different, rates in the air and in a vacuum. before you conduct your experiment, you need to form a hypothesis. a hypothesis is a prediction of what you think will happen in the experiment. the hypothesis is a statement that describes “if” a certain set of circumstances are present “then” there will be a specific result that will occur. record your hypothesis here: record the results from step one of the experiment (dropping the objects in the air): first trial: second trial: third trial: record the results from step two of the experiment (dropping the objects in a vacuum): first trial: second trial: third trial: did the experiment support your hypothesis? using the data from your experiment, describe why you believe your hypothesis was either proven or disproven. what forces were acting on the objects dropped in the air? what force was acting on the objects dropped in the vacuum? part two: comparing forces choose two forces and compare and contrast these forces. you must provide two ways that they are alike and two ways that they are different. you may make a list, write in paragraph form, or make a chart. choose two forces and compare and contrast these forces. these must be different forces than used in the prior question. provide two ways that they are similar and two ways that they are different. you may make a list, write it out, or make a chart.