Determine la permeabilidad magnética, en \( \mathrm{Tm} / \mathrm{A} \), de un material si éste tiene una permeabilidad relativa de \( 1.2 \times 10^{4} \). Redondea a 5 decimales

Determine the angle \( \theta \) which will maximise the moment \( M O \) of the 200 N force about the shaft axis at \( O \). Also compute \( M O \).

2. Determine the angle \( \theta \) which will maximise the moment \( M O \) of the 200 N force about the shaft axis at \( O \). Also compute \( M O \).

Using an electronic decibel meter, Monique measures the loudness of an acoustic guitar at a distance of 1 meter, and gets a reading of 65 decibels \( (d=65) \) Using the decibel formula, solve: \( 65=10 \log \left(\frac{P}{P_{0}}\right) \) to find the loudness ratio \( \frac{P}{P_{0}} \) Write your answer as a power of 10 like \( 10^{3} \) Next, using the same decibel meter and also from a distance of 1 meter, Monique measures an electric guitar at 100 decibels Using the decibel formula, solve: \( 100=10 \log \left(\frac{P}{P_{0}}\right) \) to find the loudness ratio \( \frac{P}{P_{0}} \) Write your answer as a power of 10 \( \frac{P}{P_{0}}=\square \) How much louder is the electric guitar? Using your answers for the loudness ratios: The electric guitar is Write your answer as a power of 10

1.14 Le plateau d'une platine de tourne-disque de disc-jockey est animé d'un mouvement circulaire uniforme, à raison de \( 33.3 \mathrm{tr} / \mathrm{min} \). 1) Exprimer les composantes du vecteur-accélération dans la base de Freinet pour un point p situé a une distance r du centre du plateau. 2) Calculer la valeur de l'accélération pour \( \mathrm{r}=10 \mathrm{~cm} \).

\( E = G \cdot h + \frac { m v ^ { 2 } } { 2 } \quad v = ? \)