1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Vadim26 [7]
3 years ago
5

Typical residential shower controls mix streams of hot water (140 F, or 60 C) with cold water (60 F, or 15 C) to form a stream o

f 40 C (104 F) water. The entire system loses energy to the surroundings at a rate of 5 kJ/kg of exiting water. What is the ratio of cold water-to-hot water mass flow rates necessary to provide the 40 C water?
Chemistry
1 answer:
sammy [17]3 years ago
3 0

Answer:

  4:5

Explanation:

Let x represent the fraction of the mix that is hot water. Then the temperature of the mix is ...

  60x +15(1-x) = 40·1

  45x = 25 . . . . . . . . . subtract 15

  x = 25/45 = 5/9 . . . divide by the coefficient of x

This is the fraction that is hot water, so the fraction that is cold water is ...

  1-5/9 = 4/9

The ratio of cold to hot is ...

  cold : hot = (4/9) : (5/9) = 4 : 5

_____

<em>Additional comments</em>

The problem assumes that the energy contained in a given mass of water is proportional to its temperature. That is almost true, sufficiently so that we can reasonably use that approximation.

If heat loss is figured into the problem, then additional information is needed regarding the energy content of water at temperatures in the range of interest. That is not provided by this problem statement, so we have ignored the heat loss.

You might be interested in
Which statement is the best example of an object and motion that would make it hard for people to accept Newton’s first law? A r
djverab [1.8K]

Answer:

The best example of an object and motion that would make it hard for people to accept Newtons first law is, "A rolling ball eventully slows down and comes to a stop".

Explanation:

7 0
3 years ago
I haven’t had a teacher for my chemistry class and in order for me to pass I need to pass this here final. Can someone please he
QveST [7]
The answer is G Container 2 
.
Hope this helps
.
Zane 
.
<span> esskeetit</span>
5 0
3 years ago
Formula semidesarrollada de los hidrocarburos aromáticos de 1 a 10 átomos de carbono
Tju [1.3M]

Answer:

El principal componente del gas natural es también el hidrocarburo más simple: el metano. Este compuesto está formado por un átomo de carbono y cuatro átomos de hidrógeno y se representa de dos formas:

El hidrocarburo que le sigue en simplicidad es aquel que está constituido por dos átomos de carbono. Su fórmula condensada es C2H6 y se le conoce como etano.

Si se continúan colocando átomos de carbono con enlaces sencillos entre ellos e hidrógenos en los enlaces libres, se crean largas cadenas de compuestos. Al etano le sigue el propano (C2H8) y a éste, el butano (C4H10). Todos estos compuestos forman parte de la familia de los alcanos, y sus nombres terminan con el sufijo –ano para indicar que pertenecen a la misma familia.

3 0
2 years ago
I need help with number 4 and 5 someone plz help
attashe74 [19]
4. Static, sliding,rolling,and fluid friction
4 0
3 years ago
What is a number at the bottom right of an element in a chemical equation called?
Ann [662]

Answer:

There’s a particular way of writing what’s in a molecule called a chemical formula. The chemical formulae for all the elements that form each molecule and uses a small number to the bottom right of an element’s symbol to stand for the number of atoms of that element. For example, the chemical formula for water is H 2 O.

Explanation:

7 0
3 years ago
Read 2 more answers
Other questions:
  • Find the molecular formula of a compound that contains 30.45% nitrogen and 69.55% oxygen. The molar mass of the compound is 92.0
    14·1 answer
  • Do anybody knows this I need help asap
    6·1 answer
  • 1. What type of reaction is listed below? Prove that it is balanced by listing the number of elements on both side of the equati
    15·2 answers
  • How do you find the molecular formula from the empirical formula?
    8·1 answer
  • If I raise the Celsius scale by 15 degrees, how<br> much will I be raising it in the Kelvin Scale?
    9·1 answer
  • Difine the term compound​
    12·1 answer
  • Please Help! Thank You
    15·1 answer
  • Why is partial pressure of oxygen greater at lower levels in water.
    7·1 answer
  • 27.2g CuCl2 was dissolved in 2.50 L of the water. What is the molality of the solution?
    15·1 answer
  • What is the smallest whole-number coefficient for h₂s when the equation h₂s mno₄⁻ → mn²⁺ so₄²⁻ is balanced in acidic solution?
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!