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
Leto [7]
4 years ago
14

Describe a single measurement that you could make that shows that a kettle is less than 100% efficient (providing evidence that

thermal energy is also lost to the environment in addition to heating the water inside. (hint: what measurements did you take last week

Chemistry
1 answer:
alexgriva [62]4 years ago
7 0

Answer:

As you haven't explained what measurements you took before solving this problem, I will explain the general procedure to evaluate the efficiency of a kettle. I hope it helps you. I´ll send an attachement file with the full answer, since I couldn't write it here.

I assume that the material that is going to be heated in the kettle is water.

1- You have to boil water in it and take the time it takes to its boiling point (in seconds).  

2- You have to evaluate the amount of energy the water absorbed Q with the efficiency formula which I explain in the attachement file.

3- Divide Q by the time it took to bring the water to boiling so you can have the power it consumed.

4- You divide the last value you obtained by the Kettles's power rating.  

5- Multiply the last value by 100 to obtain a percentage value of efficiency.

Explanation:

Efficiency is the ration of a machine's useful work, in this case how much energy the water absorbed to get to its boiling point divided by the time it took to get to this point, and the total energy expended, in this case the kettles's power rating.

You might be interested in
Given that Ag-107 (51.839% abundance) and the mass ratio: Ag-109/Ag-107=1.0187.
Ymorist [56]

Answer:

Atomic mass of Ag-107 = 106.94 amu

Explanation:

Let the mass of Ag-107 be y

Since the mass ratio of Ag-109/Ag-107 is 1.0187, the mass of Ag-109  is 1.0187 times heavier than the mass of Ag-107

Mass of Ag-109  = 1.0187y

Relative atomic mass of Ag = sum of (mass of each isotope * abundance)

Relative atomic mass of Ag = 107.87

Abundance of Ag-107 = 51.839% = 0.51839

Abundance of Ag-109 = 41.161% = 0.48161

107.87 = (y * 0.51839) + (1.018y * 0.48161)

107.87 = 0.51838y + 0.49027898y

107.87 = 1.00865898y

y = 107.87/1.00865898

y = 106.94 amu

Therefore, atomic mass of Ag-107 = 106.94 amu

5 0
4 years ago
__________ electrons are the most important electrons to an atom.
Pie

Answer:

Valence electrons are the most important electrons to an atom.

Explanation:

They will determine many of the atoms traits since they are involved in bonding with other atoms.

7 0
4 years ago
Read 2 more answers
How do transitional fossils fit with the theory of evolution
iren2701 [21]
These transitional fossils serve as evidence to Darwin's Theory of Natural Selection as conserved traits are proven to survive the test of time. This also supports evolution in a way that is shows gradual change in traits of species over generations due to change in living conditions.
3 0
3 years ago
What type of microscope has a magnification less than 300x but allows you to view objects in 3D?
Sindrei [870]
The Stereo microscope, also called a dissecting microscope, has two optical paths at slightly different angles allowing the image to be viewed three-dimensionally under the lenses. Stereo microscopes magnify at low power, typically between 10X and 200X.
5 0
3 years ago
Read 2 more answers
Heavy elements such as aluminum and carbon were formed by which of these phenomena? A. Big bang B. Fusion in very large star C.
Anton [14]
The answer is D. Supernova.

4 0
3 years ago
Other questions:
  • Muscles work in _____ so when other muscles contract the other ___
    13·1 answer
  • Which are true comparisons of alpha and beta decay? Check all that apply.
    11·2 answers
  • The half-life of a radioactive isotope is 20 minutes. What is the total amount of 1.00 g of sample of this isotope remaining aft
    6·1 answer
  • Pls help me solve this and I will mark you the Brainiest
    6·2 answers
  • A laboratory protocol lists the following ingredients: 1 g sucrose, 16.4 g Na2HPO4, 1.5 g (NH4)3PO4, 0.02 g CaCO3, KNO3, water t
    9·1 answer
  • Balance the equation _C2H6 + _H2O = _CO2 + _H2O
    7·1 answer
  • When 14.7 mL of aqueous HBr was added to water, 482 mL of a solution with a pH of 4.23 was produced. What was the molarity of th
    13·1 answer
  • A positively charged subatomic particle
    10·2 answers
  • Which of the following is an exothermic reaction?
    7·2 answers
  • un estudiante preparo un modelo tierra /luna en que las dos esferas estaban separadas por 100m. ¿cuales eran los diametros de la
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!