Question

hlo friends i am new to brainly ,this is my third question pls answer it ,pls no spam, who will give the right answers for all the questions i will follow u ,thank u r answers,and mark u as brainliest​

Answer 1

Answer:

30 degree celcius

Explanation:

since it is given that 50 gms water at 20 ⁰ C and 50 gms of water at 40⁰ C are mixed.  Since the masses of the liquid at different temperatures are same, the answer is very easy and simple :  average of 20⁰C and 40⁰C.  that is:  30⁰C.

=====================

final temperature of the mixture =  

    = [ m1 * T1 + m2 * T2 ] / (m1 + m2)

    = [ 50 gms * 20⁰ C + 50 gms * 40⁰C ]  / (50+50)

    = 3,000 / 100 = 30⁰C

====================

another way using specific heats :

  let the final temperature be = T ⁰C

  Amount of heat given out by the hot water = m * s * (40⁰C - T)

          = 50 gms * s* (40 -T)

  Amount of heat taken in by the cold water = m * s * (T - 20⁰C)

      = 50 gms * s * (T - 20 )

  As the amounts are equal, because the heat is transferred from hotwater to the cold water without any loss of heat to any surroundings,

          50 * s * (40 -T) = 50 gm * s  * (T-20)  

                40 - T = T - 20

            2 T = 60    => T = 30⁰C

Answer 2

13) The surrounding air will become warm when water vapor condenses. The vapors when become water will give away latent heat they have, we know that latent heat is required for the object to change states, so, the latent heat the water vapor had when it became water vapor from water will be given out when it again becomes water.





Please do what you promised us to..