3 Physics Questions


1) A gas is contained in a cubic box whose sides are 3m long. If the gas is initially at 80 K, and it is heated up to 320 K at constant volume, and the initial pressure is 0.5 atmosphere. What is the final pressure?Multiple Choice A) 1 atmosphereB) 0.125 atmospheresC) 0.5 atmospheresD) 2 atmospheres2) A window of a car is found to be covered with 1.3cm of ice. If the area of the window is 1 m2, and the ice is at -12 degrees Celsius, what is the minimum heat required to melt all the ice? Take the density of ice to be 900 kg/m3, the specific heat capacity of ice to be 0.5 cal/g*K, and the latent heat of fusion to be 80 cal/g. Answer in kcal.Non multiple Choice 3) What is the final temperature when 100 g of iron at 90 degrees Celsius is placed in 400 g of water at 25 degrees Celsius? The specific heat capacity of iron 0.45 J/g*K and the specific heat capacity of water is 4.184 J/g*K.A) 30.2 degrees CelsiusB) 26.7 DEGREES CELSIUSC) 93.7 DEGREES CELSIUSD) 21.1 DEGREES CELSIUS

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