How round is the Earth in miles?

How round is the Earth in miles?

The distance between the north and south poles is approximately 7900 miles while the equatorial diameter is slightly larger at 7930 miles. The circumference of the Earth is just its average diameter, 7915 miles, times the number pi, where pi is 3.14159. This gives us about 25,000 miles for the Earth’s circumference.

What is the exact radius of the earth?

Its equatorial radius is 6378 km, but its polar radius is 6357 km – in other words, the Earth is slightly flattened. Eratosthenes was measuring the polar radius, and his value (using the 0.15 km/stadium conversion) lies between the polar and equatorial values.

Is the Earth 24000 miles?

Today, most scientists set the earth’s circumference at 40,096 kilometers (24,901 miles). This gives Eratosthenes’ estimate less than a one percent error—an excellent approximation of the earth’s circumference. Syene is not on the Tropic of Cancer, where the sun’s rays are directly overhead during the summer solstice.

What is the Earth’s radius in KM?

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.

How thick is Earth in miles?

Earth’s crust varies in thickness from 35 to 70 kilometers (22 to 44 miles) in the continents and 5 to 10 kilometers (3 to 6 miles) in the ocean basins.

How fast does Earth spin?

With this information, to work out how fast Earth is spinning we need only our planet’s circumference. At the equator, its circumference is roughly 40,075 kilometres, so dividing this by the length of day means that, at the equator, Earth spins at about 1670 kilometres per hour.

What is Earth’s radius Class 9?

The radius of the earth is about 6370 km.

What is the radius of Earth Class 7?

The radius of the earth is 6371 km.

What is Earth made of?

Earth is composed of four main layers, starting with an inner core at the planet’s center, enveloped by the outer core, mantle, and crust. The inner core is a solid sphere made of iron and nickel metals about 759 miles (1,221 kilometers) in radius.

How old is Earth?

Earth is estimated to be 4.54 billion years old, plus or minus about 50 million years. Scientists have scoured the Earth searching for the oldest rocks to radiometrically date. In northwestern Canada, they discovered rocks about 4.03 billion years old.

How heavy is Earth?

Is space 50 miles above Earth?

For NASA and the U.S. military, for example, space starts at an altitude of 50 miles (around 80 kilometers), according to NOAA. However to the international community, including the Fédération Aéronautique Internationale (opens in new tab) (FAI), space starts a little higher, at 62 miles (100 km), at the Kármán line.

How big is space in miles?

A common definition of space is known as the Kármán Line, an imaginary boundary 100 kilometers (62 miles) above mean sea level.

Is the Earth 40000 km?

In 200 B.C. Eratosthenes estimated Earth’s circumference at about 46,250 kilometers (28,735 miles). Today we know our planet’s circumference is roughly 40,000 kilometers (24,850 miles).

Is the radius of Earth is 6400 km?

The mass of the Earth is about 10 times the mass of Mars. If an object weighs 200 N on the surface of Earth, its weight on the surface of Mars will be.

How deep is Earths core?

The ball-shaped core lies beneath the cool, brittle crust and the mostly-solid mantle. The core is found about 2,900 kilometers (1,802 miles) below Earth’s surface, and has a radius of about 3,485 kilometers (2,165 miles).

Is Earth core hotter than sun?

That led to the conclusion that the temperature of the center of the Earth is about 6000 degrees Celsius – a temperature about 9% higher than what exists on the surface of the Sun.

How far does Earth cover in 1 minute?

One degree of latitude equals approximately 364,000 feet (69 miles), one minute equals 6,068 feet (1.15 miles), and one-second equals 101 feet.

Is the radius of the earth is 6371 km?

Approximating the figure of Earth by an Earth spheroid, the radius ranges from a maximum of nearly 6,378 km (3,963 mi) (equatorial radius, denoted a) to a minimum of nearly 6,357 km (3,950 mi) (polar radius, denoted b).

What is the radius of the earth Mcq?

6,371 km is the radius of the earth.

What is the radius of Earth in SI unit?

The Earth’s radius is 6371 km .