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Levart [38]
3 years ago
14

Proof with the expression that the surface of Earth is round​

Physics
1 answer:
lisov135 [29]3 years ago
7 0

Answer:

The earliest documented mention of the spherical Earth concept dates from around the 5th century BC, when it was mentioned by ancient Greek philosophers.[1][2] In the 3rd century BC, Hellenistic astronomy established the roughly spherical shape of the Earth as a physical fact and calculated the Earth's circumference. This knowledge was gradually adopted throughout the Old World during Late Antiquity and the Middle Ages.[3][4][5][6] A practical demonstration of Earth's sphericity was achieved by Ferdinand Magellan and Juan Sebastián Elcano's circumnavigation (1519–1522).[7]

hope it helps you

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A ball is thrown upward with a speed of 40 m/s. Approximately how much time goes it take the ball to travel from the release loc
yulyashka [42]

Answer:

(I). The time at highest point 4.0 sec.

(II).  It returns to back to its original height in 8.1 sec

Explanation:

Given that,

Velocity v=40\ m/s

(I). We need to calculate the time at highest point

Using equation of motion

v=u+gt

Where, v = final velocity

u = initial velocity

g = acceleration due to gravity

t = time

Put the value into the formula

0=40-9.8t

-40=-9.8t

t=\dfrac{40}{9.8}

t=4.0\ sec

(II). We know that, when the ball to travel from the initial point and reached at initial point then the displacement is zero.

We need to calculate the total time when it returns to back to its original height

Using equation of motion

s=ut-\dfrac{1}{2}gt^2

Where, s = displacement

g = acceleration due to gravity

t = time

u = velocity

Put the value in the equation

0=40t-\dfrac{1}{2}9.8t^2

80t-9.8t^2=0

t=0, 8.1 sec

Hence. (I). The time at highest point 4.0 sec.

(II). It returns to back to its original height in 8.1 sec

5 0
3 years ago
When an object is moving with uniform circular motion, the centripetal acceleration of the object a. is circular. b. is perpendi
never [62]
Hi Pupil Here's Your answer :::


➡➡➡➡➡➡➡➡➡➡➡➡➡


When an object is moving with uniform circular motion, the centripetal acceleration of the object \textbf{is\:Zero}.


Because the body is moving with a uniform velocity and hence, there might not be any acceleration due to it.


⬅⬅⬅⬅⬅⬅⬅⬅⬅⬅⬅⬅⬅



Hope this helps .......
5 0
3 years ago
4. SEP Construct Explanations What type(s) of energy
ziro4ka [17]

Answer:

it is below pls give 5 star

Explanation:

Foods contain stored potential energy in the form of chemical energy. When we consume food, the particles undergo a chemical reaction that releases the chemical energy. In turn, this energy is used by the body to perform its daily activities.

Therefore, when you eat a bowl of vegetable soup, you get the chemical energy that is stored in it.

RESULT

Foods contain stored potential energy in the form of chemical energy. When we consume food, the particles undergo a chemical reaction that releases the chemical energy. In turn, this energy is used by the body to perform its daily activities.

Therefore, when you eat a bowl of vegetable soup, you get the chemical energy that is stored in it

3 0
3 years ago
Which is the temperature that Fahrenheit and Celsius thermometers would
Dmitry [639]
If I am not mistaken it’s 0
6 0
3 years ago
Read 2 more answers
All of the noble gases, Group 18, have eight valence electrons in its outer shell (excluding helium which only has two).
mina [271]

C) 0 cause it’s a stable reaction

8 0
4 years ago
Read 2 more answers
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