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Home Question Bank Physics Archive 2024 November 15

Physics Questions from Nov 15,2024

Browse the Physics Q&A Archive for Nov 15,2024, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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31. La velocidad de la luz es de 300000000 metros recorridos en un segundo. ¿cuál es el valor equivalente a esta velocidad? (2 puntos) \( 3 \times 10^{9} \) \( 3 \times 10^{8} \) \( 3 \times 10^{-8} \) 31. La velocidad de la luz es de 300000000 metros recorridos en un segundo. ¿cuál es el valor equivalente a esta velocidad? ( 2 puntos) \( 3 \times 10^{9} \) Imagina que juegas un video juego de PS, conduces un auto de última generación, viajas a una velocidad de 15 \( \mathrm{~m} / \mathrm{s} \) Observas que tu aceleración es constante a razón de \( 1.6 \mathrm{~m} / \mathrm{s}^{\wedge} 2 \) ¿Qué distancia recorrerá en 30 segundos? (R puntos) [a] (a) An acetate rod may be charged positively by rubbing it with a dry cloth, whereas a polythene rod will be negatively charged if similarly rubbing. (i) Explain why this occurs. [4 mks] (ii) Explain, with the aid of diagrams if necessary, why it is possible to pick up small bits of paper with either of these charged rods. [4 mks] 18 Un empleado de la construcción necesita subir una caja con material de 20 kg de masa a un segundo piso que se encuentra a 2 metros de altura. La energía mecánica del sistema es: (2 puntos) Cat 392 J (O) 298 J 300 J \begin{tabular}{|l|l|}\hline 1. Una fuerza horizontal de 80 N se \\ aplica sobre un cuerpo de 15 kg \\ colocado sobre una superficie ho- \\ rizontal. Despreciando la fuerza de \\ fricción, calcula la aceleración pro- \\ ducida y la magnitud de la fuerza \\ normal. \end{tabular} n an electric motor, electrical energy from a power source is used to turn a rotor, which hen performs mechanical work. What energy conversion takes place in an electric motor? (1 Mark) a. Electrical energy \( \rightarrow \) Thermal energy \( \rightarrow \) Mechanical energy b. Electrical energy \( \rightarrow \) Kinetic energy \( \rightarrow \) Heat energy c. Electrical energy \( \rightarrow \) Magnetic energy \( \rightarrow \) Mechanical energy 1. In a steam engine, water is heated in a boiler to create steam. The steam then expands and pushes a piston, causing it to move. What energy conversion occurs in this process? (1 Mark) a. Chemical energy \( \rightarrow \) Heat energy \( \rightarrow \) Mechanical energy b. Electrical energy \( \rightarrow \) Heat energy \( \rightarrow \) Mechanical energy c. Heat energy \( \rightarrow \) Chemical energy \( \rightarrow \) Mechanical energy d. Chemical energy \( \rightarrow \) Electrical energy \( \rightarrow \) Mechanical energy Una persona timpia un accesorio de cobre de 0.50 kg con un trozo do tela durante \( 2,0 \mathrm{~min} \). Mueve la tela a través del accesorio a una velocidad constante do \( 1,0 \mathrm{~m} / \mathrm{s} \) y aplica una fuerza de 20 N tangente a la superficie del accesorio. Calcule: The scale reads 17 N when the lower spring has been compressed by 2.6 cm . What is the value of the spring constant for the lower spring? Express your answer to two significant figures and include the appropriate units.
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