Respecting boundaries in each of the following interactions indicate whether the system does (posi- tive) work, has (positive) work done on it or neither and whether the system boundary is effectively diathermal or adiabatic. "effectively", here means your answers should reflect whether a significant amount of heat actually does flow during the given time. provide brief (one word to one sentence) justifications. 1.a the system is the air contained within both a bicycle tire and the pump connected to it. the pump plunger is pushed down, forcing air into the tire. this interaction is over before the air significantly cools. 1.b the system is the water and water vapor within a metal pot covered by a tight-fitting lid. the pot is placed over a flame. the temperature and pressure of the water and water vapor increase. 1.c following the interaction in part b the lid flies off the pot. assume this happens very quickly, too quickly for temperature to change much 1.d the system is the air contained within a room. the room doors and windows are closed and of ordinary construction. a fan within the room is left running for one hour 1.e the system is a mixture of hydrogen and oxygen contained within a rigid metal container. the mixture combusts quickly and then remains in the container
Answers: 2
Physics, 22.06.2019 05:30, jalexus
Thomas his older brothers, who own a junk yard, on the weekends to earn extra money. he likes to them push broken-down cars to the back of the junk yard because it makes him feel strong. last saturday, they pushed three cars with different weights, and he noticed he used different amounts of force for each one. the cars were the following weights: white car: 2,700 kg red car: 1,500 kg blue car: 2,100 kg think about how much force is needed to move each car. which correctly lists the cars in order from the most to least amount of force needed to move them? a) white, blue, red b) blue, red, white c) red, white, blue d) white, red, blue
Answers: 2
Physics, 22.06.2019 13:00, mandilynn22
Nacidified solution was electrolyzed using copper electrodes. a constant current of 1.18 a caused the anode to lose 0.584 g after 1.52 ✕ 103 s. given that the charge of an electron is 1.6022 ✕ 10−19 c, calculate avogadro's number. assume that copper is oxidized to cu2+ ions.
Answers: 1
Physics, 22.06.2019 20:00, scott5315
Aspectroscope breaks light up into its colors, allowing scientists to analyze light from the solar system and universe. by studying the spectral line patterns, widths, strengths and positions, scientists can determine the speed, position, and of celestial bodies. a) age b) origin c) rotation d) temperature
Answers: 1
Respecting boundaries in each of the following interactions indicate whether the system does (posi-...
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