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Home Question Bank Physics Archive 2024 November 28

Physics Questions from Nov 28,2024

Browse the Physics Q&A Archive for Nov 28,2024, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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1. Which one of the following is wrong about a body is thrown in to air at some angle? A. The horizontal velocity is constant because the acceleration of the object does not have vertical component. During projectile motion with no air resistance the horizontal component of its velocity remains constant and the vertical component of its acceleration is equal to -g because during the projectile motion there is no external horizontal force thus the horizontal velocity remains constant but due to the vertical force. B. The frec-fall acceleration is constant over the range of motion, and it is always directed down ward. The acceleration is constant and equal to the gravitational acceleration \( g \) which is 9.8 meters per square second at sea level on the Earth. The weight, size, and shape of the object are not a factor in describing a free fall. In a vacuum, a beach ball falls with the same acceleration as an airliner. C. The effect of air resistance is negligible and at maximum height its. If resistance is taken into account, the resistive force will act opposite to direction of motion. Thus when the body is going in upwards direction, it won't reach the maximum height achieved before because of more force downwards. In resorte tiene longitud natural de 80 cm una fuerza de 100 newion, 10 estira a 140 cm . allar el Trabajo realizado al estirarlo de In resorte tiene longitud natural de 80 cm una fuerza de 100 newton, lo estira a 140 cm . allar el Trabajo realizado al estirarlo de \( 1,0 \mathrm{~m} \) a \( 1,3 \mathrm{~m} \). 5. Un condensador tiene \( 8 \mu \mathrm{~F} \) está conectado en serie con una resistencia de \( 40 \Omega \) y con una fuente de ca de 117 V a 60 Hz . Determine: (Valor 10 puntos \( \mathbf{c} / \mathbf{u}) \) a) El factor de potencia. 1. Se lleva a cabo una prueba de flexión en tres puntos sobre un bloque de zinc que tiene 8 plg de largo, \( 0,5 \mathrm{plg} \) de ancho y \( 0,25 \mathrm{plg} \) de espesor. Sabiendo que la distancia entre los dos soportes de apoyo es de 4 plg, y que cuando se aplica una fuerza de 400 Ib B pieza se flexiona 0,037 plg y se rompe, calcule. a) la resistencia a la flexión y b) el modulo de flexión, suponiendo que no ocurre ninguna deformacion plastica. 1. Se lleva a cabo una prueba de flexión en tres puntos sobre un bloque de zinc que tiene 8 plg de largo, 0.5 plg de ancho y \( 0,25 \mathrm{plg} \) de espesor. Sabiendo que la distancia entre los dos soportes de apoyo es de 4 plg, y que cuando se aplica una fuerza d 400 ll B pieza se flexiona 0,037 plg y se rompe, calcule a) la resistencia a la flexión y b) el módulo de flexión, suponiendo que no ocurre ninguna deformacion plastica. If the rod is in equilibrium, then: \( \mathrm{T}_{1}: \mathrm{T}_{2}: \mathrm{W}=\ldots \ldots \ldots \) (a) \( 5: 3: 4 \) (b) \( 8: 5: 4 \) (c) \( 4: 3: 5 \) (d) \( 5: 4: 3 \) progressive wave equation is represented by = a sin( \( 150 \pi t-\pi x / 4) \). if the phase difference a progressive wave is \( 45^{\circ} \), the value of \( x \) in e equation is \( \begin{array}{ll}\text { A) } 3 \mathrm{~cm} \\ \text { D) } 4 \mathrm{~cm} \\ \text { D) } 2 \mathrm{~cm}\end{array} \) Two men are pushing a car with a force of 16 pounds. If the car weighs 2775 pounds, what is the total force being applied to the car? Round your answer to four decimals. Answer 8. Quale fem produce il campo magnetico? Un solenoide è formato da 25 m di filo di resistività ugu a \( 2,3 \cdot 10^{-8} \Omega \mathrm{~m} \). Il filo, che ha un raggio di \( 2,1 \mathrm{~mm} \) arrotolato uniformemente su di un tubo di plastica di d metro \( 4,5 \mathrm{~cm} \) e lunghezza \( 1,65 \mathrm{~m} \). Determina la fem a quale vanno collegati gli estremi del filo per produrre campo magnetico di \( 0,015 \mathrm{~T} \) all'interno del solenoide.
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