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Home Question Bank Physics Archive 2024 November 26

Physics Questions from Nov 26,2024

Browse the Physics Q&A Archive for Nov 26,2024, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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QUESTION 1: TRANSIENTS Use the following data from a DC powered relay coil transient circuit and answer the questions that follow: DATA: Time Constant \( =4,25 \mathrm{~ms} \) Supply Voltage \( =120 \mathrm{~V} \) If at the end of \( 5,25 \mathrm{~ms} \) from switch on, the current through the coil increases to \( 0,425 \mathrm{~A} \), calculate the following: 1.1.1 The steady state current. \( \begin{array}{ll}\text { 1.1.1.2 The value of the resistance. } \\ \text { 1.1.3 The value of the inductance of the coil. }\end{array} \) fficial (Closed) - Sensitive Normal A capacitor is made of two plates, with an area of \( 0.002 \mathrm{~m}^{2} \), and separated by a distance of 0.001 m . The space between the plates is filled by a sheet of mylar, of relative permittivity \( \mathrm{sr}_{\mathrm{r}}=3 \). Find its capacitance \( \mathrm{C} . \mathrm{C}=(A \mu \circ \mu \mathrm{r}) / d, \mu 0=8.854 \times 10^{-12} \), \( (\mathrm{F}=53.12 \mathrm{pF}) \) A. Assuming this is a pressure diagram, is this an open pipe, closed pipe or double closed pipe? \( \begin{array}{ll}\text { B. How many wavelengths are shown in the diagram? } & \text { E. What is the frequency? } \\ \text { C. What fraction of the total length is one wavelength? } & \text { W. Which resonance is this? }\end{array} \) A 23 kg mass is connected to a nail on a frictionless table by a massless string 1.3 m long. There is no appreciable friction between the nail and the string. If the tension in the string is 51 N while the mass moves in a uniform circle on the table, how long does it take for the mass to make one complete revolution? A. 4.5 s B. 3.8 s C. 4.8 s D. 5.2 s E. 5.85 A very small round ball is located near a large solid sphere of uniform density. The force that the large sphere exerts on the ball a. can only be calculated using calculus. b. is independent of the mass of the ball. c. is approximately the same as it would be if all thi mass of the sphere were concentrated at the center of the sphere. d. is exactly the same as it would be if all the mass of the sphere were concentrated at the center of the sphere. A very small round ball is located near a large solid sphere of uniform density. The force that the large sphere exerts on the ball a. can only be calculated using calculus. b. is independent of the mass of the ball. were concentrated at the center of the sphere. d. is exactly the same as it would be if all the mass of the sphere were concentrated at the center of the sphere. e. is independent of the mass of the sphere. A ball is thrown upward at an angle with a speed and direction such that it reaches a maximum height of 16.0 m above the point it was released, with no appreciable air resistance. At its maximum height, it has a speed of \( 18.0 \mathrm{~m} / \mathrm{s} \). With what speed was the ball released? a. \( 25.3 \mathrm{~m} / \mathrm{s} \) b. \( 22.2 \mathrm{~m} / \mathrm{s} \) c. \( 33.0 \mathrm{~m} / \mathrm{s} \) d. \( 36.9 \mathrm{~m} / \mathrm{s} \) e. \( 29.2 \mathrm{~m} / \mathrm{s} \) A 50.0 N box is sliding on a rough horizontal floor, and the only horizontal force acting on it is friction. You observe that at one instant the box is sliding to the right at \( 1.75 \mathrm{~m} / \mathrm{s} \) and that it stops in 2.25 s with uniform acceleration. What magnitude force does friction exert on this box? a. .490 N b. 3.37 N c. 38.9 N d. 8.93 N A rock is thrown upwards at an angle of \( 40^{\circ} \) with respect to the horizontal. As the rock is rising in its trajectory, the vertical component of its velocity a. remains the same. b. decreases. c. is zero. d. increases. e. cannot be determined without additional information. A person is dragging a packing crate of mass 100 kg across a rough honzontal floor where the coefficient of kinetic friction is 0.400 . He exerts a force F sufficient to accelerate the crate forward. At what angle above horizontal should his pulling force be directed in order to achieve the maximum acceleration? a. \( 30^{\circ} \) b. \( 34.5^{\circ} \) c. \( 45^{\circ} \) d. \( 21.8^{\circ} \) e. \( 27.7^{\circ} \)
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