Phyiscs

Please show work

You decide to take a nice hot bath but discover that your thoughtless roommate has used up most of the hot water. You fill the tub with 270 kg of 30.0°C water and attempt to warm it further by pouring in 5.00 kg of boiling water from the stove.
(a) Is this a reversible or an irreversible process? Use physical reasoning to explain.
(b) Calculate the final temperature of the bath water.
(c) Calculate the net change in entropy of the system (bath water + boiling water), assuming no heat exchange with the air or the tub itself.

  1. 👍
  2. 👎
  3. 👁
  1. a) Mixing high and low temperature is an irreversible process. You cannot separate the equilibrated mixture into high and low temperature without performing work. Could you run the mixing process backwards? No way.

    b) Set the heat loss by the warm water equal to the heat gained by the cold water, and solve for final T.

    c) Entropy gain =
    Q/Tfinal - Q/t1 - Q/T2.

    Get Q (the heat transfer) from part (b)

    1. 👍
    2. 👎

Respond to this Question

First Name

Your Response

Similar Questions

  1. Physics

    A brass lid screws tightly onto a glass jar at 20 oC. To help open the jar, it can be placed into a bath of hot water. After this treatment, the temperature of the lid and the jar are both 60 oC. The inside diameter of the lid is

  2. chemistry

    consider a crystallization of sulfanilamide in which 10 mL of hot 95% ethyl alcohol is added to 0.10 g of impure sulfanimide. after the solid has dissolved, the solution is cooled to room temp. and then placed into an ice-water

  3. Physics 11th Grade "HEAT' 2

    1) Emily is testing her baby's bath water and finds that is too cold,so she adds some hot water from kettle on the stove. If Emily adds 2.00 kg of water at 80.0 degree celcius to 20.0 kg of bath water at 27.0 degree celcius , what

  4. Chemistry

    Imagine that your water heater has broken, but you want to take a bath. You fill your bathtub with 25kg of room-temperature water (about 25C). You figure that you can boil water on the stove and pour it into the bath to raise the

  1. calculus problem I have tried 100 times

    A tank in the shape of an inverted right circular cone has height 5 meters and radius 4 meters. It is filled with 2 meters of hot chocolate. Find the work required to empty the tank by pumping the hot chocolate over the top of the

  2. science

    A bath contains 100 kg of water at 60 °C. Hot and cold water taps are turned on to deliver 20 kg per minute each at temperatures of 70 °C and 10 C respectively. How long will it be before the temperature in the bath has dropped

  3. o chem

    Impure acetanilide was dissolved in the required amount of hot water. The clear solution in a beaker was immediately placed in an ice-water bath, instead of being allowed to cool down slowly. What would be the result of cooling

  4. physics

    the resistance of a platinum resistance thermometer is 200.0 ohm at o degree centigrade and 257.6 ohm when immersed in hot bath,what is the temperature of the bath when 'alpha' for platinum is 0.00392degree centigrade inverse.

  1. chemistry

    A biology experiment requires the preparation of a water bath at 37.0°C (body temperature). The temperature of the cold tap water is 22.0°C, and the temperature of the hot tap water is 55.0°C. If a student starts with 70.0 g of

  2. computer

    A coworker calls you at 9:00 a.m. at work and asks for a favor. He is having car trouble and will be an hour late for work. He explains that he has already been late for work twice this month and that a third time will cost him

  3. physics

    Emily is testing her baby’s bath water and finds that it is too cold, so she adds some hot water from a kettle on the stove. If Emily adds 2.00 kg of water at 80.0° C to 20.0 kg of bath water at 27.0° C, what is the final

  4. math

    You decide you will buy a stock only if it shows an overall increase over the next 30 days. The first 10 days, it has an average daily increase of $0.30. The next10 days, it has an average daily decrease of $0.45. The last 10

You can view more similar questions or ask a new question.