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ladessa [460]
3 years ago
9

Historians know that large stone blocks can be dragged if logs are placed under them. Is the idea that the Egyptians built the p

yramids by rolling stone blocks on log a fact or hypothesis
Physics
2 answers:
drek231 [11]3 years ago
6 0
It is a hypothesis, because historians know about how stone blocks are moved, but they are speculating when it comes to this topic. No one can ever truly say how the pyramids were built.
Naya [18.7K]3 years ago
4 0

Answer:

Hypothesis

Explanation:

Historians are a group of scientists dedicated to studying history and try to depict history as best the can.

It has been a question that has baffled minds throughout the years, and even today we still have no clear answer. The question of how the Egyptians built the pyramids.

It is one theory that the ancient civilization dragged the large stone blocks over logs. The reason that all speculations about history are considered hypotheses, is because no one can say with 100% certainty what an ancient civilization did, because they were not there to witness it, hence all theories are considered hypotheses.

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A car with a velocity of 6.4 m/s, forward, accelerates to a velocity of 10.6 m/s, forward, in 16 s. What is the card acceleratio
tatuchka [14]

Answer:

acceleration = 0.2625 m/s²

Explanation:

   acceleration = ( final velocity - initial velocity ) / time

Here the final velocity is  10.6 m/s and initial velocity is 6.4 m/s and time is 16 s.

using the equation:

acceleration =  ( 10.6 - 6.4 ) / 16

                     = 0.2625 m/s²

6 0
3 years ago
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If you place 48 cm object 15 m in front of a convex mirror of focal length 5 m, what is the magnification of the image?
Arisa [49]

Answer:

m = 0.25

Explanation:

Given that,

Object distance, u = -15cm

Height of the object, h = 48

Focal length, f = cm

We need to find the magnification of the image.

Let v is the image distance. Using mirror's equation.

\dfrac{1}{v}+\dfrac{1}{u}=\dfrac{1}{f}\\\\\dfrac{1}{v}=\dfrac{1}{f}-\dfrac{1}{u}\\\\=\dfrac{1}{5}-\dfrac{1}{(-15)}\\\\=3.75\ cm

Magnification,

m=\dfrac{-v}{u}\\\\=\dfrac{-3.75}{-15}\\\\=0.25

Hence, the magnification of the image is 0.25.

7 0
3 years ago
(a) A 70-kg person at rest has an oxygen consumption rate Qhum = 14.5 liter/h, 2% of which is supplied by diffusion through the
nevsk [136]

Answer:

(a) fd=1.7058\times 10^{-5}\ L.hr^{-1}.cm(b) [tex]r=26.008\ cm

Explanation:

(a)

  • Oxygen consumption rate of humans, Q_h=14.5\ L.hr^{-1}

area of human skin, A_h=1.7\ m^2

  • diffusion rate through skin of humans, d=2\%\ of\ Q_h
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d=0.29\ L.hr^{-1}

<u>Flux of diffusion rate, </u>

fd=\frac{d}{A}

fd=\frac{0.29}{17000}

fd=1.7058\times 10^{-5}\ L.hr^{-1}.cm(b)Surface area for a spherical animal:[tex]A=4.\pi.r^2

Diffusion flux rate for animal:

fd=\frac{14.5}{A}

1.7058\times 10^{-5}=\frac{14.5}{4.\pi.r^2}

r=26.008\ cm

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