Bonsoir Le mascaret est une vague qui remonte une rivière ou un fleuve à marée montante. Sa vitesse est environ de 20km/h.
Des sportifs essaient de surfer sur la vague le plus longtemps possible. Ainsi Colin Whitbread a surfé un mascaret de la rivière Petitcodiac au Canada sur 29 kilomètres

Calculer la durée du trajet de Colin Whitebread
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A__ is two or more substances that are together in the same place but are not chemically combined

Which mathematical relationship should you us to convert moles of a substance into grams

100 grams of molten lead (600°c) is used to make musket balls. if the lead shot is allowed to cool to room temperature (21°c), what is the change in entropy (in j/k) of the lead? (for the specific heat of molten and solid lead use 1.29 j/g⋅°c; the latent heat of fusion and the melting point of lead are 2.45 × 104 j/kg and 327°c, respectively.)