Using vocabulary such as meridian, zenith, etc., describe the relationship of a star's altitude above the horizon and the observer's latitude. if you are positioned at the earth's equator, and a given star is at your zenith, what happens to that star's position (relative to you, the observer) as you walk in a straight line to the north pole? why are some stars and constellations only seen during certain seasons?

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.

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