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Q:
After hitting the ball, the stick continues forward at \( 12 \mathrm{~m} \mathrm{~s}^{-1} \). The mass of the stick is 600 g and t mass of the ball is 160 g . Calculate the velocity of the ball. What assumption(s) are made in you calculation?
Q:
Allinterno di un dielettrico omogeneo ed isotropo, di costante dielettrica relativa \( \epsilon_{r}=1.5 \), il campo elettrico vale in modulo \( E=100 \mathrm{~V} / \mathrm{m} \). Quanto vale il modulo della polarizzazione \( \mathbf{P} \) ? \( \begin{array}{l}\text { (a) } P=44.25 \times 10^{-5} \mathrm{C} / \mathrm{m}^{2} \\ \text { (b) } P=44.25 \times 10^{-11} \mathrm{C} / \mathrm{m}^{2} \\ \text { (c) } P=44.25 \times 10^{-12} \mathrm{C} / \mathrm{m}^{2} \\ \text { (d) } P=44.25 \times 10^{-6} \mathrm{C} / \mathrm{m}^{2} \\ \text { (d) } 8.8541878128(13) \times 10^{-12}\end{array} \)
Q:
The pair continue on their journey at a constant speed of \( 12 \mathrm{~m} \mathrm{~s}^{-1} \). The car is fitted with a crumple zone. Alex says the crumple zone can increase the time of impact in a collision from 0.2 seconds to 0.8 seconds. The mass of the car and occupants is 1600 kg . Use physics principles and appropriate calculation(s) to explain how having a crumple zone can make this car safer for the occupants during a collision.
Q:
A BMW car with mass of 12 tons accelerates from rest uniformly from rest up a gradient 1 of 3 and reaches as speed of \( 72 \mathrm{~km} / \mathrm{h} \) after 3 minutes Calculate 1.1. The acceleration of the BMW. 12. The kinetic energy that the BMW possess after 3 minutes 13. Potential eneray after 3 minutes
Q:
4. ¿En qué tiempo el sonido producido por una explosión podria viajar \( 8,5 \mathrm{~km} \) ? \( \begin{array}{lll}\text { a) } 10 \mathrm{~s} & \text { b) } 25 & \text { c) } 15 \\ \text { d) } 35 & \text { e) } 50 & \end{array} \)
Q:
5. Una persona emite un grito frente a un muro situado a 170 m de la persona. Determinar al cabo de qué tiempo escucha el eco. \( \begin{array}{lll}\text { a) } 0,5 \mathrm{~s} & \text { b) } 1 & \text { c) } 1,5 \\ \text { d) } 2 & \text { e) } 2,5 & \end{array} \)
Q:
3. El sonido se propaga en el aire con una velocidad de \( 340 \mathrm{~m} / \mathrm{s} \). ¿Qué tiempo tardará en escucharse el estampido de un cañón situado a 17 km ? \( \begin{array}{lll}\text { a) } 10 \mathrm{~s} & \text { b) } 30 & \text { c) } 20 \\ \text { d) } 40 & \text { e) } 50 & \end{array} \)
Q:
2. Un atleta recorre una pista de largo "L" en 8 s . Si el atleta duplicara su rapidez pero recorriendo otra pista de largo " \( 3 L \) " de longitud, determine en qué tiempo se puede realizar este nuevo recorrido. \( \begin{array}{lll}\text { a) } 4 \mathrm{~s} & \text { b) } 2 & \text { c) } 6 \\ \text { d) } 12 & \text { e) } 16 & \end{array} \)
Q:
1. Un nadador recorre una piscina de largo "L" en 6 s pero si la distancia se duplicara y la rapidez del nadador se triplicara, determine el tiempo utilizado en este caso. \( \begin{array}{lll}\text { a) } 6 s & \text { b) } 8 & \text { c) } 2 \\ \text { d) } 4 & \text { e) } 12 & \end{array} \)
Q:
(i) The distance \( d \) travelled by a ball is proportional to the square the time taken, \( t \). After 4 seconds the ball has travelled 40 n (i) Find a formula linking \( d \) and \( t \). (ii) Find the distance travelled after 7 seconds.
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