Per preparare un bagno, una vasca viene riempita con 40 L d'acqua alla temperatura di \( 60^{\circ} \mathrm{C} \) e 20 L alla temperatura di \( 18^{\circ} \mathrm{C} \). Qual è la temperatura ottenuta? Trascura le dispersioni di calore.

At sporting events the crowd sometimes generates a "wave" that propagates around the stadium. What type of wave is this?

What type of potential energy is due to the position of an object above the Earth's surfack?

निकाल्नुहोस् । (If a bus covers 4.2 km of distance in 7 minutes, then calculate its average velocity.) Ans: \( 10 \mathrm{~m} / \mathrm{s} \)

If you increase the speed of a wave on a Slinky by increasing the tension, but keep the same frequency of back-and-forth motion, how does the wavelength change? Multiple Choice

Look at the electrical diagram. \begin{tabular}{l}\( V=8.6 \mathrm{~V} \) \\ \( I 1=0.3 \mathrm{~A} \) \\ \( I 2=0.5 \mathrm{~A} \) \\ \( I 3=0.2 \mathrm{~A} \) \\ Calculate the total resistance. \\ \hline 8.6 \\ \hline OK. \\ \( \begin{array}{l}V=10.6 \mathrm{~V} \\ I 1=0.9 \mathrm{~A} \\ I 2=0.3 \mathrm{~A} \\ I 3=0.3 \mathrm{~A}\end{array} \) \\ Calculate the total resistance. \\ \hline\end{tabular}