Earning the acceleration due to gravity, g, is constant at sea level on the earth's surface. however, the acceleration decreases as an object moves away from the surface due to the increase in distance from the center of the earth. derive an expression for the acceleration due to gravity at a distance h above the surface of the earth, gh. express the equation in terms of the radius of the earth re, g and h. a 70.00 kg hiker has ascended to a height of 1854 m in the process of climbing mt. washington. by what percent has the hiker's weight changed by climbing to this elevation? use g 9.807 m/s2 and re 6.371 x 10s m. (hint: keep 4 significant figures in your weight calculation to find the percent difference.) number % w change

- measure reactants precisely. ( first choice)

- stir to the reaction take place. ( second choice)

- wait patiently until the reaction completes. ( fourth choice)

- make sure to recover as much copper as possible. ( last choice)

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.