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3 years ago

Who was the first scientist to provide documentation and evidence to show a heliocentric model of the universe?

Physics

2 answers:

miv72 [106K]3 years ago

6 0

Answer:

Aristarchus of samos

Explanation:

Aristarchus was a great scientist in ancient world
He first proved the universe by his heliocentric model

sweet [91]3 years ago

3 0

Answer:

C. Aristarchus of Samos

Explanation:

Aristarchus created the first known heliocentric model of the Solar System. He also thought stars were other bodies like the sun, but much farther away.

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How does a mathematical model help you understand the science concepts

Dmitrij [34]

It can help with measurements and when you want to add measurements to a cylinder or a beaker so ya

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3 years ago

Determine the volume displaced and then calculate the density of this 54 g sample of brass.

inessss [21]

Answer:

DETAILS IN THE QUESTION INSUFFICIENT TO ANSWER

Explanation:

Assuming the liquid to be water ,

the density $d_{w}$ of water is : $1000kgm^{-3}=1gcm^{-3}$

Buoyant force exerted by a liquid on an object with $V_{imm}$ of it's volume immersed is :

$F_{B}=V_{imm}*d_{l}*g$

where ,

$F_{B}$ is the buoyant force
$d_{l}$ is the density of the liquid
$g$ is the acceleration due to gravity

Thus at equilibrium:

$m_{brass}*g=V_{imm}*d_{l}*g\\m_{brass}=V_{imm}*d_{l}\\54=V_{imm}*1\\V_{imm}=54cm^{3}$

from these , we get the density of brass to be $1gcm^{-3}$

which is not possible

7 0

3 years ago

What do we call a substance in<br> which two or more elements are<br> chemically bonded

Goryan [66]

Answer:

A compound

Explanation:

A compound is a substance formed when two or more elements are chemically joined

8 0

4 years ago

Read 2 more answers

A heliocentric system is _____-centered.

aniked [119]

A heliocentric system is a sun-centered

3 0

4 years ago

Read 2 more answers

A skier of mass 60 kg is pulled up a slope by a motor-driven cable. (a) How much work is required to pull him 75 m up a 30° slop

postnew [5]

Answer:

Explanation:

Given

mass of skier=60 kg

distance traveled by skier=75 m

inclination $(\theta )=30^{\circ}$

speed (v)=2.4 m/s

as the skier is moving up with a constant velocity therefore net force is zero

$F_{net}=0$

Force applied by cable $=mg\sin \theta$

$F=60\times 9.8\times \sin (30)=294 N$

work done $=F\cdot x$

$W=294\cdot 75=22.125 J$

(b)Power $=F\cdot v$

$P=294\cdot 2.4=705.6 W\approx 0.946 hp$

5 0

3 years ago