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Home Question Bank Physics Archive 2024 December 27

Physics Questions from Dec 27,2024

Browse the Physics Q&A Archive for Dec 27,2024, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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3.33 • Uma canoa tem velocidade de \( 0,40 \mathrm{~m} / \mathrm{s} \) a sudeste em relação à Terra. A canoa se desloca em um rio que escoa a \( 0,50 \mathrm{~m} / \mathrm{s} \) para leste em relação à Terra. Determine o módulo, a direção e o sentido da velocidade da canoa em relação ao rio. 27. Two trains, 1 and 2 , have an equal mass of \( m=5,000 \mathrm{~kg} \) each. Train 1 is traveling with a speed \( n=15 \mathrm{~m} / \mathrm{s} \) before striking train 2 , which was at rest. If the two trains lock together as the result of the collision. What is their common speed immediately after collision? Describe the law of conservation of momentum as it pertains to a real-life scenario, and explain how it applies. Begin by identifying the real-life scenario. You may start your response with: - A real-life scenario pertaining to conservation of momentum is ... - In this scenario, the law of conservation of energy applies because . . . Example 10 Three coplanar forces of magnitudes \( F, 5,3 \) Newton act on a particle and the measure of the angle between the second the third force is \( 60^{\circ} \). Find the value of \( F \) if the forces are in equilibrium. Laurel is calculating the power she generated while running the 800 m race. She exerted a force of 200 N to complete the race in 150 seconds. (A) How much work did she do? (B) How much power didsshe exert? Be sure to give units, include the equations used, and show your work. You may begin your responses with: - The work she did is . . . because . . . . iii). Given that the cuboid has a mass of 700 g , Find its density in \( \mathrm{Kgm}^{-3} \) Train moving with speed of \( (40 \mathrm{~m} / \mathrm{s}) \) the driver have resorted to the use of brakes to reduce the speed of the train movement by rate \( \left(-2 \mathrm{~m} / \mathrm{s}^{2}\right) \) Calculate: a) The amount of time it takes for the train even stops completely. b) The amount of distance traveled since the train began braking until it stops (c) When the temperature reaches \( -18^{\circ} \mathrm{C} \), the pressure of the gas in the cylinder is still equal to that of the atmosphere. Explain, in terms of the particles of the gas, how the pressure remains equal to its original value. Explain, in terms of the particles of the metal, why the decrease in the volume of the metal is less than that of the gas. decrease in the volume of the metal is much less than the decrease in the volume of the gas. EXERCISES It is known that the flow of fluid \( (\mathrm{Q} \) rate) is a fluid volume passing per unit time, based on the pressure gradient \( (\mathrm{P} / \ell) \) where \( (p) \) is the pressure between the ends of the tube flow stream, \( (\ell) \) is the length of pipe flow, also depends on the viscosity of the liquid \( (\eta) \) and the radius of the tube \( (r) \), by using the concept of compatibility between the units and dimensions theory derive a mathematical formula for flow rate depending on the variables mentioned above. Un dipôle ohmique de résistance \( 3300 \Omega \) est traversé par une tension de 900 mV . Calculer l'intensité qui traverse se dipôle.
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