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
denis-greek [22]
3 years ago
9

Serena is a research student who has conducted an experiment on the discoloration of marble. Read about Serena’s experiment. The

n identify two flaws in her experiment’s design.
Serena sees an article about the Taj Mahal, a medieval marble monument in India. She reads that the white monument is beginning to turn a dull yellow-brown. Serena admires the Taj Mahal and is eager to learn what might be causing the yellowing. She formulates a hypothesis that the yellow-brown tinge may be caused by air pollution from black carbon, brown carbon, or methane, combined with wind erosion.

To test her hypothesis, she decides to study the effects of these air pollutants and wind on white marble. She finds three identical pieces of white marble and exposes one of them to air containing black carbon, one to air with brown carbon, and one to air with methane. She also places a fan on two of the samples, varying the speed of the air stream in regular intervals. After a few days, the marble samples begin changing color, becoming grayish. Serena learns that air pollution caused the discoloration. However, she is not sure how it became gray instead of yellow and what exactly caused the discoloration.

She used identical pieces of marble for her samples.
She introduced at least one confounding variable.
She tried to test multiple hypotheses at a time.
She attributed the marble discoloration to wind erosion.
She used a mechanically-generated air stream rather than natural 
Physics
1 answer:
sergij07 [2.7K]3 years ago
3 0

The two flaws in her experiment’s design are

<span>- She introduced at least one confounding variable.</span> <span>- She tried to test multiple hypotheses at a time</span>

 In the above mentioned experiment she had to have four samples to prove four hypotheses, each one separately and not to mix two hypotheses in an alone sample, that what it brings as consequence is the confusion.

You might be interested in
A car traveling at 5m/s starts to speed up after 3 seconds its velocity has increased to 11 m/s what is its acceleration
vfiekz [6]

Answer:

a=(v-u)/t

Explanation:

a =(11-5)/3

a= 8/3

a= 2.6 m/s

4 0
2 years ago
If jack was traveling north 120 miles and it took him 3 hours to get there. what is the velocity that jack was traveling? is thi
Dimas [21]

Answers:

40 mp/h; Vector

Reason:

120/3 is 40 miles per hour.

Velocity is a vector measurement.

^.^

- Amanda

4 0
3 years ago
a car travels at 15 m/s for 10 s. It then speeds up with a constant acceleration of 2.0 m/s? for 15 s. At the end of this time,
Firlakuza [10]

V = u + at where u is initial velocity (15 m/s), a is acceleration (2m/s^2) and t is time (15 seconds)

V = 15 + 2 X 15

V = 45 m/s

6 0
3 years ago
Why is this website not work how i want it this is so annoying
Mice21 [21]
It depends how you want it to work do you want to take a picture oh yea and to do that you must create a account btw
5 0
3 years ago
Read 2 more answers
What's saturns rotation
xeze [42]
The way it rotates is Counter-clockwise
4 0
3 years ago
Other questions:
  • It is believed that during the late Cretaceous period sea levels rose drastically resulting in about a third of the Earth's pres
    9·2 answers
  • An arrow strikes a target moving at 75 m/s and embeds itself 15 cm into the target. If the arrow stopped with constant accelerat
    15·1 answer
  • Low-mass and medium-mass stars eventually
    10·1 answer
  • a 6-kg and a 4-kg ball are acted on by forces of equal size. if the large ball accelerates at 2 m/s2 what acceleration will the
    9·2 answers
  • A student standing on a cliff that is a vertical height d = 8.0 m above the level ground throws a stone with velocity v0 = 22 m/
    7·1 answer
  • In Ørsted’s observation, the current-carrying wire acted like a
    5·2 answers
  • If an atom gains two electrons in a chemical reaction, what is its charge?
    10·1 answer
  • In a position-time graph what does it mean when you return to 0? ASAP HELP PLEASE!
    11·1 answer
  • 23.
    15·1 answer
  • How are newtons third law of motion applies to a system of objects
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!