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liubo4ka [24]
3 years ago
7

Why Is it important to have a control group in an experimental investigation

Physics
1 answer:
11Alexandr11 [23.1K]3 years ago
4 0

It is important to have a control group in an experimental investigation because if the experiment did not have the control group the data collected would not be accurate. For example if you're testing water turning into ice but you use a different freezer or ice tray for each experiment then there are some elements that would make your data inaccurate.

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What is the relationship between the structure of a white blood cell and its function in the body.
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White blood cell,also called leukocyte or white corpuscle,a cellular component of the blood that lacks hemoglobin,has a nucleus,is capable of motility,and defends the body against infection and disease by ingesting foreign materials and cellular debris,by destroying infectious agents and cancer cells.
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3 years ago
Galileo was a contemporary of
Vitek1552 [10]
Brahe & Kepler

Answer from Quizlet
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3 years ago
1) Subatomic particles called muons can be created in the upper atmosphere by collisions of cosmic rays (energetic particles com
Vsevolod [243]

Answer and explanation:

A.

Muon travelled straight down towards the earth. Therefore the tree moves up in the rest frame of muon (option a)

B.

In muon rest frame it travels Zero meters

C.

Distance, d = Velocity, v * Time, s

where, v = 0.9c = 0.9 \times 8 \times 10^8 , s = 2.2 \mu s

d = 0.9 \times 3 \times 10^8 \times 2.2 \times 10^{-6}\\\\d = 594m

D.

Distance from the top of the mountain to the tree is the same as the distance travelled by the tree in the muons rest frame

that is same as in part C which is 594m

E.

Using lorentz contraction

In the rest frame of someone standing on the mountain

the distance is given by

d' = \frac{d}{\gamma} = d\sqrt{1 - \frac{v^2}{c^2}}, where, \frac{1}{\gamma}= \sqrt{1 - \frac{v^2}{c^2}}

d' = 594\sqrt{1 - \frac{(0.9c)^2}{c^2}}

d' = 594\sqrt{1 - 0.81}

d' = 594 \times 0.4359

d' = 258.92m

F.

in the rest frame of someone standing on the mountain,

muon moves straight down

3 0
4 years ago
Help please, i need the claim, evidence and reasoning
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Explanation:

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Which of the following describes how a sound wave can bounce off a surface?
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Answer:

a

Explanation:

4 0
3 years ago
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