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The diameter of a circle is a circle's largest chord.
Yes, a cord that is a diameter always passes through the center of a circle. And it's also the longest cord of that circle.
Yes, that is the definition of a semicircle.
If you want to, you can always draw a circle around an isosceles trapezoid and the radius can be half the base of the trapezoid.
The base of a cone is always a circle. it also can be a ellipse.
That is possible, for example, if an object moves around in a circle. In this case, the velocity changes all the time; the speed does not.
direction
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Something is accelerating when it is traveling in a circle because the direction of its velocity is changing.It is important to understand that a velocity not only has a magnitude but it also has a direction. In general, if the magnitude and/or direction of an object's velocity is changing, we say that it is accelerating.Again, if something is traveling and only the direction that it is traveling changes, we still say it is accelerating because the direction that it is traveling is changing.This is the case when something is traveling in a circle at constant speed. If you where to represent its velocity by a vector you would find that while the magnitude of the vector does not change over time, the direction of the vector does. In fact, over a very short period of time, if you where to represent the change in direction of its velocity by a vector, you would find that that "difference vector" points directly toward the center of the circle.Again, this is all a bit confusing because when we generally use the word "accelerate" we mean that something is speeding up. However one just has to get use to the idea that when something is accelerating, it may be that only the direction of its velocity is changing and not necessarily the magnitude of its velocity.To learn more about this go to the related links below.
Yes. That should only bother people who still think that 'accelerating' means 'speeding up'. It doesn't. 'Acceleration' means any change of speed or direction.
yes the galaxy does revolve around the sun. gravity may have something to do with it because i think that it holds the universe together
always.
Yes
No, the radius of a circle is always 1/2 of the diameter.
Acceleration is the time rate of change of velocity. Velocity is a vector. It has a magnitude ( speed ) and a directio. If either the speed or the direction of motion changes the object is accelerating. Example; an object moving in a circle at constant speed is accelerating because its direction is continually changing.
Acceleration is the rate of change of velocity over time, so velocity must always be changing if the object is accelerating. HOWEVER, you said speed which means only magnitude, not direction. If you stay the same speed, but change direction then you are accelerating. Simple answer: when you are going the same speed in a circle - velocity changes, therefore acceleration changes.
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