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Home Question Bank Physics Archive 2024 December 14

Physics Questions from Dec 14,2024

Browse the Physics Q&A Archive for Dec 14,2024, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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4. Write your answers on an A4 bond paper with a 0.5 in. border on all sides. 1. A completely reversible heat engine operates with a source at 1500 R and a sink at 500 R If the entropy of the sink increase by 10 Btu/R, how much will the entropy of the source decrease? How much heat in Btu is transferred from the source? Describe a method to measure the density of a liquid. 6.63 - Um carregador empurra uma mala de \( 20,0 \mathrm{~kg} \) para cima de uma rampa com inclinação de \( 32,0^{\circ} \) acima da horizontal com uma força \( \overrightarrow{\boldsymbol{F}} \) de módulo igual a 160 N que atua paralelamente à rampa. O coeficiente de atrito cinético entre a rampa e a inclinação é dado por \( \mu_{\mathrm{c}}=0,300 \). Se a mala se desloca \( 3,80 \mathrm{~m} \) ao longo da \( \overrightarrow{ } \) rampa, calcule (a) o trabalho realizado sobre a mala pela força \( \overrightarrow{\boldsymbol{F}} \); (b) o trabalho realizado sobre a mala pela força gravitacional; (c) o trabalho realizado sobre a mala pela força normal; (d) o trabalho realizado sobre a mala pela força de atrito; (e) o trabalho total realizado sobre a mala; (f) se a velocidade da mala é nula na parte inferior da rampa, qual é sua velocidade depois que ela se desloca 3.80 m ao longo da rampa? 4. What does the atmospheric pressure is 760 mm of mercury mean? Pascal's Principle says that an increase in pressure in one part of an enclosed liquid results in an increase in pressure throughout all parts of that liquid. Why then does the pressure differs at different heights? 26. An object travels at \( 9 \mathrm{~m} / \mathrm{s} \) for a total of 10 seconds. How far does it travel in that time? How would you determine the density of an irregularly shaped object? What is the acceleration of an object that starts at a velocity of \( 98 \mathrm{~m} / \mathrm{s} \) forward and comes to a stop in 8.4 seconds? 1. The distance between air particles is very small-about \( 3 \times 10^{-7} \mathrm{~cm} \) How can we say that there is considerable empty space in air? 6.49 CALC Uma força na direção \( x \) positiva com módulo \( F(x)=18,0 \mathrm{~N}-(0,530 \mathrm{~N} / \mathrm{m}) x \) é aplicada a uma caixa de \( 6,00 \mathrm{~kg} \) apoiada sobre a superfície horizontal e sem atrito de um lago congelado. \( F(x) \) é a única força horizontal sobre a caixa. Se a caixa está inicialmente em repouso em \( x=0 \), qual é sua veloci- dade depois de ter atravessado \( 14,0 \mathrm{~m} \) ?
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