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
Roman55 [17]
3 years ago
15

Sarah is making bread. She measures 0.6 kg of hot water into a bowl. The water needs to be at a temperature of

Physics
1 answer:
Mrrafil [7]3 years ago
6 0

Answer:

\Delta m = 0.171\,kg

Explanation:

The process of water adding is described by the First Law of Thermodynamics:

m_{w,o} \cdot h_{w,o} + \Delta m \cdot h_{w} = (m_{w,o} + \Delta m)\cdot h_{w,f}

The amount of additional mass is:

m_{w,o}\cdot h_{w,o} - m_{w,o}\cdot h_{w,f} = \Delta m\cdot (h_{w,f}-h_{w})

\Delta m = \frac{m_{w,o}\cdot(h_{w,o}-h_{w,f})}{h_{w,f}-h_{w}}

Given that water is incompressible, the equation can be further simplified:

\Delta m = m_{w,o}\cdot \frac{c_{p,w}\cdot (T_{w,o}-T_{w,f})}{c_{p,w}\cdot (T_{w,f}-T_{w})}

\Delta m = m_{w,o}\cdot \left(\frac{T_{w,o}-T_{w,f}}{T_{w,f}-T_{w}} \right)

\Delta m = (0.6\,kg)\cdot \left(\frac{40 ^{\circ}C - 42^{\circ}C}{42^{\circ}C-49^{\circ}C} \right)

\Delta m = 0.171\,kg

.

You might be interested in
One mole of water is equivalent to 18 grams of water. A glass of water has a mass of 200 g. How many moles of water is this?
Black_prince [1.1K]
200g*1 mole/ 18g=11.1 moles There are 11.1 moles of water. 
4 0
2 years ago
Read 2 more answers
What is the relationship between acceleration and time?
Harlamova29_29 [7]

Answer:

The relationship between acceleration and time relates to the velocity and how it changes throughout the movement of an object.

8 0
3 years ago
Cancer and diabetes are two common hereditary diseases.
Klio2033 [76]

It is a true statement that cancer and diabetes are two common hereditary diseases.

<h3>What are hereditary diseases?</h3>

The term hereditary diseases are those diseases that occur in parents and could also be found in their offspring. For many of these hereditary diseases, the mechanism of inheritance is unclear.

However, it is a true statement that cancer and diabetes are two common hereditary diseases.

Missing parts:

Cancer and diabetes are two common hereditary diseases. A. True B. False.

Learn more about hereditary diseases:brainly.com/question/9367480?r

#SPJ1

3 0
2 years ago
An automatic dryer spins wet clothes at an angular speed of 5.2 rad/s. Starting from rest, the dryer reaches its operating speed
Dvinal [7]
<h2>Time taken by dryer to come up to speed is 1.625 seconds.</h2>

Explanation:

We have equation of motion v = u + at

     Initial velocity, u =  0 rad/s

     Final velocity, v = 5.2 rad/s    

     Time, t = ?

     Acceleration, a = 3.2 rad/s²

     Substituting

                      v = u + at  

                      5.2 = 0 + 3.2 x t

                      t = 1.625 s

Time taken by dryer to come up to speed is 1.625 seconds.

6 0
3 years ago
A 0.02kg dart is loaded into a toy spring gun by compressing the spring 6cm. If the spring has a constant of 20 N/m, find… a. Th
katrin2010 [14]

Answer:

a) 0.036 J b) 0.036J c) 0.036 d) 1.9m/s e) 0.18 m

Explanation:

Mass of the dart = 0.02kg, the spring was compressed to 6cm

Work needed to compress the spring = 1/2*k*x ^2 where k is the force constant of the spring in N/m, x is the distance it was compressed in m

Work needed to compress the spring = 0.5 * 20* 0.06^2 since 6cm = 6 / 100 = 0.06 m

Work needed to compress the spring = 0.036J

b) the total energy stored in the spring = the work done to compress the spring = 0.036J

c) kinetic energy of the dart as it leaves the the spring = elastic potential energy stored in the spring = the work done in compressing the = 0.036J using the law of conservation of energy; energy is neither created nor destroyed but transformed from one form to another.

d) 1/2mv^2 = 0.036

mv^2 = 0.036*2

v^2 = 0.036*2 / 0.02 = 3.6

v = √3.6 = 1.897 approx 1.9m/s

e) kinetic energy of the dart = work done against gravity to get the body to height h

Work done against gravity = potential energy conserved at height = -mgh g is negative because the motion is upward while gravity acts downward

0.036 = 0.02 * 9.81 * h

0.036 / ( 0.02*9.81) = h

h = 0.18 m

6 0
3 years ago
Other questions:
  • in a given chemical reaction the energy of the products is greater than the energy of the reactants this is because
    12·1 answer
  • If a solution is forced to dissolve more solute than it normally can dissolve, the solution is
    12·1 answer
  • Surface currents are driven by _____.<br> wind<br> density<br> salinity<br> temperature
    5·2 answers
  • A hoop of mass 2 kg, radius 0.5 m is rotating about its center with an angular speed of 3 rad's. A force of 10N is applied tange
    8·1 answer
  • An automobile tire having a temperature of 3.4 ◦C (a cold tire on a cold day) is filled to a gauge pressure of 24 lb/in2 . What
    9·2 answers
  • What is the final velocity of an object that is dropped if it falls a distance of 100 m?
    6·1 answer
  • A scientist is using an objective lens with 40X magnification on his microscope. If the ocular lens magnifies 10X, what is the t
    7·1 answer
  • Which experiment best shows water’s ability to act as a solvent? raise the temperature of water and record its boiling point. fr
    12·2 answers
  • Science please help!<br>​
    12·1 answer
  • Find the x-component and y of this vector
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!