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Andrews [41]
3 years ago
12

Scientific knowledge is both long lasting and open to change. In your own words, explain why scientific knowledge should be re-e

xamined and re-tested from time to time. Include two examples that will support your response.
Physics
2 answers:
Nostrana [21]3 years ago
7 0
Science is open to change because scientists agree that there are no absolute truths, only the best explanations for the data
there are specifically two cases when science can change: -new data is discovered (for example new skeleton makes us revise the known history of homo species)
-a new model is proposed that fits the data better (such as the heliocentric model of Copernicus)
Leviafan [203]3 years ago
3 0

Answer:

Open to change

Explanation:

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What is the wavelength of an electromagnetic wave?
gizmo_the_mogwai [7]

Answer: (A) The number of waves that pass a point in a certain amount of time.  

Explanation:

Electromagnetic waves are categorized according to their frequency f or, equivalently, according to their wavelength λ = c/f. Visible light has a wavelength range from ~400 nm to ~700 nm.

Frequency: Is the number of waves that pass a certain point in a specified amount of time.

Trough: The low point of the wave cycle.

Wavelength: The distance between two successive peaks.

Electromagnetic wave: One of the waves that are propagated by simultaneous periodic variations of electric and magnetic field intensity.

6 0
2 years ago
A heavy piece of hanging sculpture is suspended by a90-cm-long, 5.0 g steel wire. When the wind
Yuliya22 [10]

As we know that fundamental frequency is given as

f = \frac{1}{2L}\sqrt{\frac{T}{\mu}}

here we know that

\mu = \frac{m}{l}

here we have

m = mass of wire = 5 g

l = length of wire = 90 cm

\mu = \frac{0.005}{0.90} kg/m

\mu = 5.56 \times 10^{-3} kg/m

from above formula now

80 = \frac{1}{2(0.90)}\sqrt{\frac{T}{5.56\times 10^{-3}}}

144 = \sqrt{180 T}

T = 115.2 N

now we know that tension is due to weight of the sculpture so we will have

Mg = 115.2 N

M = 11.76 kg

so its mass will be 11.76 kg

6 0
4 years ago
Two stones, one with twice the mass of the other, are thrown straight up and rise to the same height h. Compare their changes in
Lady bird [3.3K]
<h2>The gravitational potential energy is double for stone with twice the mass of other stone.</h2>

Explanation:

Let mass of stone 1 be m.

Mass of stone 2 is twice the mass of stone 1.

Mass of stone 2 = 2m

We know that

  Gravitational potential energy = Mass x acceleration due to gravity x Height

  PE = mgh

For stone 1 ,

                PE₁ = mgh

For stone 2 ,

                PE₂ = 2mgh = 2 PE₁

So the gravitational potential energy is double for stone with twice the mass of other stone.

               

4 0
3 years ago
Read 2 more answers
18. For every action, there is an equal and opposite reaction.
Andrews [41]

Answer:

Thats the third law______

3 0
4 years ago
What is the difference between a 4x100 and a 4x400 relay
qaws [65]
A 4x100 relay is where 4 people run 100 meters and a 4x400 relay is where 4 people run 400 meters
6 0
3 years ago
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