A swimming pool has to be drained for maintenance. The pool is shaped like a cylinder with a diameter of 8 m and a depth of 2.1 m . If the water is pumped out of the pool at the rate of 11 m^3 per hour, how many hours does it take to empty the pool?
Use the value 3.14 for π , and round your answer to the nearest hour.

Question

A swimming pool has to be drained for maintenance. The pool is shaped like a cylinder with a diameter of 8 m and a depth of 2.1 m . If the water is pumped out of the pool at the rate of 11 m^3 per hour, how many hours does it take to empty the pool?
Use the value 3.14 for π , and round your answer to the nearest hour.

danjs · Answer

volume = 3.14 *4*4*2.1

danjs · Answer

time = volume /rate

danjs · Answer

105.5/11

about 9.6 hrs

anonymous · Answer

thank you!

anonymous · Answer

A street that is 179m long is covered in snow. City workers are using a snowplow to clear the street. The snowplow has tires that are1.3m in diameter. How many times does a tire have to turn in traveling the length of the street?
Use the value 3.14 for π . Round your answer to the nearest tenth. Do not round any intermediate steps. 

Is this the same as the other problem? @DanJS

danjs · Answer

hi

danjs · Answer

So this is asking you how many times a tire with diameter of 1.3m turn around to cover 179m distance.

danjs · Answer

the circumference of a tire is : 
C = 2*3.14*radius

danjs · Answer

how many of those circumferences are in the total distance to travel of 179 meters?

danjs · Answer

i used 1.8 for diameter, it is 1.3...1 sec

anonymous · Answer

what would be the formula for the whole thing?

danjs · Answer

oops

danjs · Answer

$$\frac{ distance }{ circumference } = \frac{ 179 }{ 2*\pi*\frac{ 1.3 }{ 2 } }$$

danjs · Answer

=179/ 4.082 
Total rotations for a tire with a diameter of 1.3m to travel a distance of 179m is -- about 43.85