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Home Question Bank Physics Archive 2024 November 07

Physics Questions from Nov 07,2024

Browse the Physics Q&A Archive for Nov 07,2024, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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Una onda sonora es enviada por un barco hasta el fondo del mar, donde se refleja y regresa . Si el viaje de ida y vuelta demora 0.6 s, ¿a que profundidad está el fondo del océano? Considere que el modulo volumétrico de agua de mar es de \( 2.1 \times 10^{\wedge} 9 \) Pa y que su densidad es de \( 1030 \mathrm{~kg} / \mathrm{m}^{3} \) \begin{tabular}{l|l|l|} 8) A zombie falls off a cliff. \\ It is falling with a gravitational \\ force of 750 N and has air & A) \( \quad \) Net force \( = \) \\ resistance of 30 N . Draw the & B) Balanced/Unbalanced? \\ forces acting on the zombie. & C) Acceleration? Direction? \end{tabular} (a) Measurements from an experiment to find the density of an irregular shaped solid are given below. Mass of the solid \( =26.0 \mathrm{~g} \) Volume of water in measuring cylinder \( =40 \mathrm{~cm}^{3} \) Volume of water and solid \( =48 \mathrm{~cm}^{3} \) Use an equation from page 2 and the information above to calculate the density of the solid. [3] Density \( = \) \( \mathrm{g} / \mathrm{cm}^{3} \) A cyclotron designed to accelerate protons has an outer radius of 0.410 m . The protons are emitted nearly at rest from a source at the center and are accelerated through 600 V each time they cross the gap between the dees. The dees are between the poles of an electromagnet where the field is 0.790 T . (a) Find the cyclotron frequency for the protons in this cyclotron. 7.56 e 7 (b) Find the speed at which protons exit the cyclotron. 3.10 e 7 (c) Find their maximum kinetic energy. 5.02 e 6 (d) How many revolutions does a proton make in the cyclotron? Your response differs from the correct answer by more than \( 10 \% \). Double check your calculations. revolutions (e) For what time interval does one proton accelerate? e s 2.3. Desde el Hormiga a Mocoa viaja una camioneta con velocidad constante de \( 20 \mathrm{~m} / \mathrm{s} \). En el momento que pasa al lado de un automóvil detenido en el cruce de Orito, este avanza con aceleración constante de \( 2 \mathrm{~m} / \mathrm{s}^{2} \). a) Realiza un gráfico de \( v-\boldsymbol{t} \). b) ¿Qué tiempo tarda el automóvil en adquirir la velocidad de la camioneta? c) ¿Qué distancla debe recorrer el automóvil para alcanzar a la camioneta? The rotor in a certain electric motor is a flat, rectangular coil with 70 turns of wire and dimensions 2.50 cm by 4.00 cm . The rotor rotates in a uniform magnetic field of 0.800 T . When the plane of the rotor is perpendicular to the direction of the magnetic field, it carries a current of 9.3 mA . In this orientation, the magnetic moment of the rotor is directed opposite the magnetic field. The rotor then turns through one-half revolution. This process is repeated to cause the rotor to turn steadily at \( 3600 \mathrm{rev} / \mathrm{min} \). (a) Find the maximum torque acting on the rotor. \( \tau_{\text {max }}=5.208 \mathrm{e}-4 \) (b) Find the peak power output of the motor. \( \mathcal{P}_{\text {max }}=1.964 \mathrm{e}-1 \) (c) Determine the amount of work performed by the magnetic field on the rotor in every full revolution. W \( =0.00327 \) Yourr response differs from the correct answer by more than \( 10 \% \). Double check your calculations. J (d) What is the average power of the motor? \( \mathcal{P} \) avg \( =1.964 \mathrm{e}-1 \) Your response differs from the correct answer by more than \( 10 \% \). Double check your calculations. W Calculate the energy of this photon 2. Un objeto lanzado directamente hacia arriba desde el nivel del piso con una velocidad inicial \( v_{o}=48 \mathrm{pies} / \mathrm{s} \), la trayectoria que describe es \( s=-16 t^{2}+48 t \) pies de altura al final de \( t \) segundos. a) ¿Cuál es la máxima altura que alcanza? b) Al final de un segundo, ¿qué tan rápido se está moviendo el objeto y en qué dirección? c) ¿Cuánto tarda en regresar a su posición original (nivel del piso)? ados os vetores \( \vec{u}=(-\hat{i},-2 \hat{j}, 3 \hat{k}) \mathrm{e} \vec{v}=(-3 \hat{i}, 0 \hat{j}, \hat{k}) \) calcule o produto etorial entre eles e escolha o item que traz a resposta correta. Tipo: problemas numéricos 1. Para elevar 400 litros de agua a la altura de 20 metros durante un tiempo de 10 segun- dos, ¿qué potencia es necesaria? 2. ¿A qué velocidad, en km/h debe marchar un camión de 3.000 kilogramos de masa para que su energía cinética sea de \( 10^{5} \) julios? 3. Con un motor de potencia igual a 4 HP, ¿cuántos litros de agua se pueden elevar por hora, a la altura de 25 metros? 4. ¿Cuál es la energía potencial con respecto al suelo de una masa de 40 kilogramos colo- cada a la altura de 40 metros? 5. ¿Cuál es la relación numérica que existe entre las unidades de trabajo ergios y julios?
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