The radius of the earth is 6370 km and of mars is 3400 km.
What is the formula of radius of Earth?
Compute the radius of the earth using the formula C (circumference) = 2 x pi x r (radius). Erastosthenes’ formula would look like this: 39,350 = 2 x 3.14 x r, or 6,267 kilometers.
What is Earth’s radius in physics?
According to data taken by 183 high-school classes participating in a World Year of Physics project, “Measure the Earth with Shadows”, the radius of Earth is 6563 km, compared to the accepted value for the mean radius of 6371 km.
What is the radius of the earth Class 7?
The radius of the earth is 6371 km.
Who calculate the radius of Earth?
This means that Eratosthenes estimated the circumference of the Earth to be about 40,000 km. He also knew that the circumference of a circle was equal to 2 times π (3.1415) times the radius of the circle. (C = 2πr) With this information, Eratosthenes inferred that the Earth’s radius was 6366 km.
Who find the radius of Earth?
During the 3 century, B.C. Eratosthenes was able to mathematically calculate the diameter of the earth by comparing the difference in the angle of the sun’s rays at different geographic points. He was the first person that was able to calculate the radius of the earth.
Who measured the radius of Earth First?
The first person to determine the size of Earth was Eratosthenes of Cyrene, who produced a surprisingly good measurement using a simple scheme that combined geometrical calculations with physical observations. Eratosthenes was born around 276 B.C., which is now Shahhat, Libya.
What is the density of Earth?
The density of the Earth is 5.513 g/cm3. This is an average of all of the material on the planet. Water is much less dense than iron, hence an average is needed for ease of use.
Who was Earth discovered by?
Earth was never formally ‘discovered’ because it was never an unrecognized entity by humans. However, its shared identity with other bodies as a “planet” is a historically recent discovery. The Earth’s position in the Solar System was correctly described in the heliocentric model proposed by Aristarchus of Samos.
Is the radius of the earth the same everywhere?
Earth’s rotation, wobbly motion and other forces have caused the North and South Pole to slightly flatten. Due to the bulging caused by the earth’s spinning, it is often called an ‘ellipsoid’. Complete answer: No, the radius of the earth is not the same everywhere.
How do I find the radius of a planet?
To determine the planet radius, the brightness drop of the parent star that occurs during a planetary transit is measured. This brightness drop is directly related to the ratio of the planet radius to the radius of its parent star, as shown in the image below.
