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What ancient greek philosopher did Galileo disprove?
planetary motion laws
If you slide a hockey puck across a frictionless ice rink is there a horizontal force on it to keep it in motion?
Once contact with the object that provided the force to initiate the motion, i.e. your hand or the hockey stick, there is no force tending to keep it in motion. The inertia of the puck in motion will resist any change in that motion, but inertia is a physical property not a force. From a free body diagram the only apparent force acting on the puck would be air resistance tending to slow it down.
What did Sir Issac Newton explain in his Philosophiae Naturalis Principia Mathmatica?
I am not sure how much detail you want. But basically he explained Newton's three Laws of Motion, Newton's Law of Gravitation and developed Kelper's Laws of Planetary Motion.
What do swastikas do?
It is a symbolic ancient tantric (mystic/black magic) ideograph used in ancient rituals to evoke similar element like the sun in clockwise motion for progressive life or the 'shakti' to evoke power & destruction by sacrifices.
How did the ancient Egyptians draw circles?
Well, they took some sort of writing utensil and they moved their hand in a circular motion, and VOILA! A CIRCLE APPEARED!
Why did the fact that stars not show any Parallax motion convince the Greeks that the Earth was not moving?
I am not sure whether the ancient Greeks were involved. In any case, any movement of the Earth should be reflected in the apparent motion of distant objects, such as stars.However, in practice, this apparent motion is very small for the stars - the yearly parallax for even the closest stars is less than one arc-second (1/3600 of a degree).
How does one of Newton's Laws of Motion explain what seems like a contradiction?
Please explain what apparent contradiction you are talking about.
Why was it difficult for ancient astronomers to explain about the apparent retrograde motion?
If, as ancient astronomers thought, that our Earth was the center point of rotation for other planets, then it is difficult to explain why those planets would move in a direction opposite to their rotation. Ptolemy came up with a solution that worked, but it was a cumbersome one. Nicolae Copernicus was able to show that this retrograde motion could be explained easily if it were assumed that our Sun was the actual center of rotation of the planets.
How does a geocentric model explain the apparent motion of the stars?
All the stars are fixed to a sphere, which rotates once in 24 hours.
What planet was used to explain retrograde motion?
Retrograde motion is motion in the opposite direction. In the case of celestial bodies, such motion may be real, defined by the inherent rotation or orbit of the body, or apparent, as seen in the skies from Earth.
What does the Greek love of sports show about ancient Greeks?
They loved the body in motion and action, they defined the term athlete.
What is a star's apparent shift in motion called?
Motion parallax.
What is Mercury's apparent motion?
mercurys motion can be like any other planets motion
Why there are seasons and the apparent motion of the stars and sun?
The seasons are due to axial tilts of planets and the apparent motion of stars and sun on the celestial sphere is due to diurnal motion.
What are two types of star motions?
Actual motion and apparent motion.
How does apparent force affect the motion of an object?
Accelerates the motion of an object.
What is a stars apparent shift in position?
Motion
