Într-un calorimetru se pune o masă de 200 g alcool cu temperatura de 30 °C și apoi se adaugă o bilă de plumb cu temperatura de 80 °C. Știind temperatura lor de echilibru de 50 °C, determină cât cântărește bila de plumb. Se dă: căldura specifică a alcoolului 2430 J/kg∙K și cea a plumbului de 130 J/kg∙K.

Avehicle has an oil leak that is causing the entire oil pan to be wet, but inspection reveals no exact source after cleaning off the oil residue. technician a says to install a fluorescent dye in the crankcase and operate the engine, then re-inspect for leaks with a special light (black light). technician b says the oil leak may be coming from a source at the top of the engine, such as a valve cover gasket. who is correct?

With i really need the correct answer!

Amodel rocket with a mass of 0.212 kg is launched into the air with an initial speed of 84 m/s. how much kinetic energy will the rocket have at a height of 214 m? assume there is no wind resistance. 634 j 303 j