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Hogar Banco de preguntas Física Archive 2025 January 14

Physics Questions from Jan 14,2025

Browse the Physics Q&A Archive for Jan 14,2025, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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Section 21.4 Electric Field and Electric Forces \( 21.25 \cdot \mathrm{CP} \mathrm{A} \) proton is placed in a uniform electric field of \( 2.75 \times 10^{3} \mathrm{~N} / \mathrm{C} \). Calculate: (a) the magnitude of the electric force felt by the proton; (b) the proton's acceleration; (c) the proton's speed after \( 1.00 \mu \) s in the field, assuming it starts from rest. \( V d l = - \int _ { b } ^ { d } \vec { E } \cdot d \vec { l } = \int _ { a } ^ { b } \vec { E } \cdot \vec { d l } \) An engine supplies 110 hp to an electric generator, and the generator delivers 90 hp of electrical power. What is the efficiency of the generator? The efficiency of the generator is \( \square \% \). (Type a whole number or decimal rounded to two decimal places as needed.) A \( 240-\mathrm{hp} \) automobile engine delivers only 171 hp to the driving wheels of the car. What is the efficiency of the transmission and drive mechanism? The efficiency of the transmission and drive mechanism is \( \square \% \). (Type a whole number or decimal rounded to two decimal places as needed.) How much energy is required to heat 0.24 kg lutetium from 296.2 K to 373.5 K ? The specific heat for lutetium is \( 0.154 \mathrm{~J} / \mathrm{g}-\mathrm{K} \). a 285.7 joules b 3694 joules c 115.8 joules d 2857 joules A. 2.40 kg block of ice is heated with 5820 J of heat. The specific heat of ice is \( 2.10 \mathrm{~J}^{-1} \mathrm{~g}^{\circ} \mathrm{C}^{-1} \). By how much will its temperature rise, assuming it does not melt? a \( 15,500,000^{\circ} \mathrm{C} \) b \( 15,500^{\circ} \mathrm{C} \) c \( 115^{\circ} \mathrm{C} \) d \( 1.15^{\circ} \mathrm{C} \) An unknown mass of aluminum requires 6290 joules to raise the temperature from \( 23.9^{\circ} \mathrm{C} \) to \( 80.0^{\circ} \mathrm{C} \). What is the mass of the aluminum? The specific heat of aluminum is \( 0.900 \mathrm{~J} / \mathrm{g} \cdot{ }^{\circ} \mathrm{C} \) a 125 g b 78 g c 246 g d 169 g A wire 20 m long is heated from a Temperatue of \( 5^{\circ} \mathrm{C} \) to \( 55^{\circ} \mathrm{C} \), if the chan in length as 0.020 m , calculate the linea expansivity of the wine. Question The atmospheric pressure is \( e .01 \times 10^{5} \mathrm{~Pa} \). A dive descend to a depth of 24 m in 8 ea woter of densi \( 1.03 \times 10^{3} \mathrm{~kg} / \mathrm{m}^{3} \) - Calculate the total pressure exer on the diver. 22. A storm occurred 405 km away from a person. Calculate the time period between seeing lightning and hearing the sound of thunder, given that the speed of light in air is \( 3 \times 10^{8} \mathrm{~m} / \mathrm{s} \) and the speed of sound is \( 330 \mathrm{~m} / \mathrm{s} \) ?
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