Water flows into a swimming pool at the rate of 8 gal/min. The pool is 16 ft wide, 32 ft long and 8 ft deep. How long does it take to fill? (1 U. S. gallon = 231 cubic inches)

Explanation:

Given:

Dimensions of pool,

L = 32 ft

B = 16 ft

H = 8 ft

Volume of the rectangular pool = L × B × H

= 32 × 16 × 8

= 4096 ft^3

converting ft^3 to inches^3,

4096 ft^3 × (12 in)^3/(1 ft)^3

= 7077888 in^3

1 gallon = 231 in^3

1 in^3 = 1/231 gallon

7077888 in^3 = 1/231 × 7077888

= 30640.2 gallons

Volumetric rate = 8 gal/min

Volumetric rate = volume/time

Time = 30640.2/8

= 3830.026 mins

Time, t = 2.66 days.

answer; ///i do believe that the correct answer is ; ///(physical change);

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.