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
juin [17]
2 years ago
8

The latent heat of fusion of alcohol is 25 kcal/kg and its melting point is -114 o C. It has a specific heat of 0.60 in its liqu

id state. Calculate the energy needed to melt 2.0 kg of solid alcohol at -114 o C and raise it to a temperature of -14 o C.
Physics
1 answer:
UNO [17]2 years ago
3 0

Answer:

=170kcal

Explanation:

We first calculate the amount of energy required to melt the alcohol using the formula: MLf, where Lf is the latent heat of fussion

We then calculate amount of heat required to raise the temperature of liquid alcohol to -14° C using MC∅.  We then add the two.

Thus ΔH=MLf+MC∅

ΔH=2kg×25kcal/kg+ 2kg×(0.6kcal/kg.K×(-14-⁻114)

=50kcal+120kcal

=170kcal

You might be interested in
What is a description of compounds?
elena-14-01-66 [18.8K]
Compounds are elements that are chemically combined, like water for example (it’s both hydrogen and oxygen.)
8 0
2 years ago
Read 2 more answers
Explain how a battery works. What are some possible materials you could use to make a battery for a circuit?
allochka39001 [22]

Answer:

Batteries are systems that store chemical energy and then release it as electrical energy when they are connected to a circuit. Batteries can be made from many materials, but they all share three main components: a metal anode, a metal cathode and an electrolyte between them. The electrolyte is an ionic solution that allows charge to flow through the system. When a load, such as a light bulb, is connected, an oxidation-reduction reaction occurs that releases electrons from the anode while the cathode gains electrons

Explanation:

4 0
3 years ago
For sprinters running at 12 m/s around a curved track of radius 26 m, how much greater (as a percentage) is the average total fo
Snezhnost [94]

Answer:

114.86%

Explanation:

In both cases, there is a vertical force equal to the sprinter's weight:

Fy = mg

When running in a circle, there is an additional centripetal force:

Fx = mv²/r

The net force is found with Pythagorean theorem:

F² = Fx² + Fy²

F² = (mv²/r)² + (mg)²

F² = m² ((v²/r)² + g²)

F = m √((v²/r)² + g²)

Compared to just the vertical force:

F / Fy

m √((v²/r)² + g²) / mg

√((v²/r)² + g²) / g

Given v = 12 m/s, r = 26 m, and g = 9.8 m/s²:

√((12²/26)² + 9.8²) / 9.8

1.1486

The force is about 114.86% greater (round as needed).

5 0
2 years ago
Which change would result in a stronger electromagnet?
Sonbull [250]
I'd say B.) Increasing the voltage of the battery.
6 0
3 years ago
Read 2 more answers
5. Dry ice is an example of _________, which is the process of a solid turning directly into a gas. (1 point) precipitation melt
ki77a [65]
<span>5. Dry ice is an example of _________, which is the process of a solid turning directly into a gas. (1 point)

sublimation


6. The ____ is a unit of force. (1 point)

</span>n<span>ewton

7. Which of the following is the boiling point of water? (1 point)
 
100°C 


8. Which of the following describes the molecular structure of water at 40°C? (1 point)

water molecules are close together and moving freely around each other </span>
6 0
3 years ago
Other questions:
  • To increase the period of a mass-spring oscillator, increase the ___
    13·1 answer
  • New ocean crust or sea floor is produced when tectonic plates _______.<br> diverge<br> converge
    14·1 answer
  • Reviewing old tests and quizzes will not help you determine what will be on a test because teachers don’t like to give students
    12·2 answers
  • ¿Cuánto tiempo tardaré en completar la distancia de una maratón 89.66km si corro a una velocidad media de 756.66km\h?
    12·1 answer
  • Sociologist use tools such as investigation and data collection to make their study more
    11·1 answer
  • A spacecraft built in the shape of a sphere moves past an observer on the Earth with a speed of 0.500c. What shape does the obse
    13·1 answer
  • You accidentally slide a glass of iced tea off a table that is 0.75 m tall. How
    8·2 answers
  • Convert the value of g=9.8m/s^2 into km/hr^2​
    13·1 answer
  • Explain why gases are more compressible than solid
    13·1 answer
  • For nitrogen to be a liquid, its temperature must be within 12.78 °f of –333.22 °f. the equation |x 333.22 | = 12.78 can be used
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!