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Home Question Bank Physics Archive 2024 December 19

Physics Questions from Dec 19,2024

Browse the Physics Q&A Archive for Dec 19,2024, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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Read the passage about Diego's experiment: Diego wants to make an electromagnet for the science fair. He only has a nail, copper wire, and a 9-volt battery. His experiment is to make a magnet strong enough to pick up paper clips. He wants to prove that his magnet can pick up the most clips. What can Diego do to his magnet to make sure he picks up the most paper clips? (1 point) Diego can wrap a few coils of the wire, far apart, around the nail. Diego can wrap a few coils of the wire, close together, around the nail. Diego can wrap many coils of the wire, close together, around the nail. Kennedy has two magnets. She would like to determine how much magnetic energy is stored in each one. What would be the best way for her to determine which magnet has the most magnetic energy? (1 point) Attach wires to the ends of each magnet and measure the flow of electricity going through the wires. Put each magnet into a beaker of water to see how much water it displaces. Measure how close each magnet can get to a metal object before picking it up. Record the weight of each magnet by measuring it on a balance scale. Calvin touches a negatively charged rod to a neutral metal sphere located on an insulated stand. What will happen to the electrons when the negatively charged rod touches the metal sphere? A point) electrons will move from the sphere to the rod electrons will move from the rod to the sphere and spread out electrons will move from the rod to the sphere but stay close together the rod and stay elose together Exercice \( \mathbf{5} \) Un étudiant en sciences observe la lumière réfléchie par la surface d'un lac par une journée ensoleillée. Il remarque que lorsqu'il incline la tête en portant des lunettes de soleil polarisées, l'intensité de la lumière réfléchie diminue fortement à un certain angle. 1. Explique pourquoi l'intensité de la lumière réfléchie change en fonction de l'orientation des lunettes. EXERCICE 3 : Un disque de rayon \( R=15 \mathrm{~cm} \) est animé d'un mouvement de 1) Calculer la fréquence de rotation du disque.. 2) En déduire la valeur de la période de rotation du disque. 3) Calculer sa vitesse angulaire en rad/s. 4) Déterminer l'angle (en degré )dont il a tourné durant 2 s. 5) Calculer la vitesse d'un point du périmètre du disque. A student has an object with a charge of -3 Coulombs. Which of the following objects would have the strongest attraction to object \( A \) ? ( 1 point) An object with a +3 charge at a distance of 2 cm An object with a -3 charge at a distance of 5 cm An object with a +3 charge at a distance of 5 cm An object with a -4 charge at a distance of 2 cm There are different methods to electrically charge an object. A girl slides down a plastic slide and her hair sticks up as she exits the botrom of the slide. This is an example of which method of building up an electric charge? (t point) Frietion Neutralization Induetion Cenduction Which variable does not increase the strength of an electromagn Increasing the number of coils Increasing the distance between the coils Increasing the thickness of the wire Adding batteries to the electromagnet Se dispone de un cañón que forma un ángulo de \( 30^{\circ} \) con la horizontal. El objetivo se encuentra en lo alto de una torre de 60 m de altura y a 120 m del cañón. Determina: a) ¿A qué velocidad debe salir disparado el provectil? b) Con la misma velocidad inicial, ¿desde qué otra posición se podría haber disparado? olución: a) \( \mathrm{V}=48.9 \mathrm{~m} / \mathrm{s} \); b) \( \mathrm{x}=91.09 \mathrm{~m} \) al otro lado de la torre 11. Tiro parabólico. 1. Se lanza un proyectil a una velocidad inicial de \( 235 \mathrm{~m} / \mathrm{s} \) y una inclínación sobre la horizontal de \( 63.5^{\circ} \). Suponiendo despreciable la pérdida de velocidad con el aire, calcula: a) ¿Cuál es la altura máxima que alcanza la bala? b) ¿A qué distancia del lanzamiento alcanza la altura máxima? c) ¿A qué distancia del lanzamiento cae el proyectil? Solución: a) \( \mathrm{h}=\mathbf{2 2 5 4 . 3 3 \mathrm { m }} \); b) \( \mathrm{x}=\mathbf{2 2 4 7 . 9 4} \mathrm{m} \); c) \( \mathrm{V}=\mathbf{4} \mathbf{4 9 5 . 8 8} \mathrm{m} \)
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