One of the many works published by the greek astronomer ptolemy (a. d ca 100-170) was optics. in this book ptolemy reports the results of refraction experiments he conducted by observing light passing from air into water. his results are as follows: angle of incidence=10 degrees, angle of refraction = 8.00 degrees, angle of incidence =20 degrees, angle of refraction =15.5 degrees. find the percentage error in the calculated index of refraction of water for each of ptolemy's measurements

This is kenetic energy.

Answertraveling around a circular trackexplanation"traveling around a circular track" is the best answer as you could be traveling around a circular track at a constant speed. your velocity would therefore have the same magnitude but will always be constantly direction. since acceleration is the rate of change of velocity, the rate of change will only involve the direction of velocity and not the magnitude.wrong choices: "an object at rest" does not accelerate at all"increasing speed while traveling around a curve" means that the acceleration will not be constant due to only change in direction; it will be constant due to both magnitude and direction"an object in free fall" does not necessarily change direction 

The big glowy thing is called the sun it is a star in our galaxy and is over 1 million degrees