Answer:
Geocentric Universe Model
His fundamental contribution was his model of the universe: he believed that the Earth was motionless and occupied the center of the universe, and that the Sun, the Moon, the planets and the stars revolved around him.
Explanation:
The first thing that Ptolemy does is justify a universe based on the geocentric system described by Aristotle. It is a vision of the world based on the fact that the Earth is fixed and around it the sphere of the fixed stars rotates every day, taking with it the spheres of the sun, the moon and the planets, using combinations of circular movements called epicycles. Once this model is established, Ptolemy goes on to describe the mathematics he needs in the rest of the work. In particular, it presents trigonometric methods based on the Crd (string) function (which is related to the sine function by sin a = (Crd 2a / 120)).
In examining the theory of the sun, Ptolemy compares his own observations of the equinoxes with those of Hipparchus and with the ancient observations of Meton in 432 B.C. He confirmed the duration of the tropic year as 365 days and 1/4 minus 1/300 of the day, the exact value obtained by Hipparchus. As Ptolemy knew, the accuracy of the rest of his data depended heavily on this value and the fact that the true one is 365 days and 1/4 minus 1/128 of the day, produced errors in the rest of his work
Otter attacks on humans are rare. Prophylactic antibiotic therapy after an animal bite is indicated for clinically significant injuries and a weakened immune response. '
The otter's main barrier against heat loss is an airtight barrier. The otter vigorously rubs its paws together to seal the air next to its skin. It can also breathe air through its fur. Underwater, they look silver because of the oxygen in Turkey. Sea otters swim on their backs when they sleep.
They can wrap themselves in seaweed or hold each other's hands while they sleep to stay there and float out to sea. Sea otters have three main strategies to escape from predators: run, hide in the kelp where they live, or surface. They can also use their powerful teeth when they encounter other sea otters.
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Answer: It would take you about 19 years to reach the Sun.
Explanation: Sun is about 8.3 light minutes from the Earth. This means it would take 8.3 minutes for light to reach from the Surface of the Sun to reach the Earth. If you are traveling in a Jumbo Jet , it would take you about 19 years to reach the Sun
Answer:
Option (B)
Explanation:
The sequential order of coal in term of its highly heated (most valuable) to least heated (least valuable) is given below-
Anthracite > Bituminous > Lignite > Peat
- Anthracite is a high-rank coal comprised of 90-95% of carbon content and only about 5% of oxygen and water content.
- Bituminous also high-rank coal comprised of 70-90% of carbon content and about 50-60% of oxygen and water content.
- Lignite is a low-rank coal and is comprised of 60-70% of carbon and about 30% of oxygen and 30-60% of water content.
- Peat is also a low-rank coal and is composed of less than 50% of carbon and about 50% of oxygen and nearly 70-80% of water.
According to the classification of coal, the amount of oxygen and water content increases from the higher grade coal to the lower grade, and the carbon content decreases from higher grade to the lower grade coal.
Thus, the correct answer is option (B).