Un fierbător electric cu rezistenţa de 150Ω este conectat la o sursă de curent electric cu t. e.m. de 120V şi rezistenţa interioară de 2Ω.
a) Ce cantitate de căldură se va degaja în 10 min? 3p
b) Câtă apă poate fi încălzită cu 200C în 10 min? (c=4200J/kg0C)

In a laboratory, nakisha mixes sodium hydroxide solution with an indicator called phenolphthalein. when combined, they create a pink solution. nakisha wonders if mixing other solutions with phenolphthalein will also create this pink color. how could she use the scientific inquiry process to explore it further?

After a big snowfall, you take your favorite rocket-powered sled out to a wide field. the field is 195 m across, and you know that your sled accelerates at a rate of 3.65 m/s2 when the rocket is on. how much time will it take the sled to cross the field starting from rest, assuming the rocket is on the whole time?

What is a possible result of higher air temperature caused by global warming