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# Physics - Problems on Temparature and Heat

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A copper vat is 44m long at 20 degrees Celcius. How long will it be when filled at boiling water (at one atmosphere of presure) This is needed at the nearest three decimal places.

an aluminum wing on a plane is 35.5m long when the temperature is 20 degrees celcius. At what temperature would the wing be at 0.06m shorter. This has to be at nearest one decimal place. I know that we are trying to find tempature not temperature change.

a bottle containing 8.1kg of mass of water temperature of 24.2 degrees celcius is placed in a refrigerator where the temperature is kept at 0.7 degrees Celcius. How much heat is transfered from the water to cool it to the water of the lower temperature. We need just heat transfer rounded to the nearest one decimal place

a 804kg car is going 27m/s and a driver has to slam on brakes to prevent an accident. Assume that 21.3 kg of iron in the brake pads and rotors absorb the heat that is absorbed by friction in the brakes and rotors. After the car stopped what is the change in temperature in the brake pads and rotors. to the nearest two deciml places.

A lead bullet with a mass of 0.05kg is traveling at 188 m/s strikes a armor plate and comes to a stop. if all the energy is converted to heat snd is absorbed by the bullet what is the temperature change.

One cubic meter of water flowing at niagra falls in new york drops 96.3 meters if all the energy of the water falling is converted to heat how much heat energy would the water have.

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## Physics Problems: Sample Questions

Consider a hot air-balloon. The deflated balloon, gondola, and 2 passengers have a combined mass of 315 kg. When inflated, the balloon contains 871m^3 of hot air. Find the temperature (degrees C) of the hot air required to lift the balloon off the ground. The air outside the balloon has a temperature of 20.2 degrees C and a pressure of 0.916x10^5 Pa. The pressure of the hot air inside the balloon is the same as the pressure of the air outside the balloon. The molar mass of air is 29g/mol. Hint: First find the density of the air outside the balloon. Then use Archimedes' principle to find the density required for the air inside the balloon. Then find the temperature of the air inside the balloon.

We drop a cube of ice into a glass of water. The mass of the cube of ice is 33.1 g and its initial temperature is -10.2 degrees C. The mass of the water is 251 g and its initial temperature is 19.7 degrees C. What is the final temperature (degrees C) of the water after all the ice has melted? Neglect any flow of heat to or from the environment. Give the answer to 2 significant figures. Now, repeat the previous problem using 90.0 g of ice. This time, not all of the ice will melt. (a) What is the final temperature (degrees C) of the water-ice mixture? (b) How much ice (g) is left?

We have some gas in a container at high pressure. The volume of the container is 420 cm^3. The pressure of the gas is 2.52x10^5 Pa. We allow the gas to expand at constant temperature until its pressure is equal to the atmospheric pressure, which at the time is 0.857x10^5 Pa. (a) Find the work (J) done on the gas. (b) Find the change of internal energy (J) of the gas. (c) Find the amount of heat (J) we added to the gas to keep it at constant temperature. Be sure to include the correct signs on the answers.

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