The wavelength is related to the frequency by the relationship:
where v is the wave speed and f is its frequency.
The speed of sound in air is v=344 m/s. The lowest frequency is f=20.0 Hz, so the corresponding wavelength is
The highest frequency is
, so the corresponding wavelength is
Therefore, the range of wavelengths of audible sound in air is
[0.017 m - 17.2 m]
The mass (in kg) of water in the pool is 1.264 
kg.
<h3>What is mass?</h3>
A numerical measurement of inertia, a basic characteristic of all matter, in physics. It essentially refers to a body of matter's resistance to changing its speed or location in response to the application of a force. The change caused by an applied force is smaller the more mass a body has.
Mass is a physical body's total amount of matter. Inertia, or the body's resistance to acceleration when a net force is applied, is also measured by this term. The strength of an object's gravitational pull to other bodies is also influenced by its mass. The kilogram serves as the SI's fundamental mass unit.
Given: A pool is 31.4 m long and 40.0 m wide. if the average depth of water is 3.30 ft
31.4 40.0 = 1256 
1 m = 39.37 in = 3.28 ft
3.30 ft = 1.01 m
Volume of pool = 1256 1.01 = 1264 
Since 1 water contains 
the volume of the pool is
1.264 E3 E3 = 1.264E6 kg
(or 1.264 kg)
The mass (in kg) of water in the pool is 1.264 kg.
To learn more about mass refer to:
brainly.com/question/19385703
#SPJ4
Supplementary angles add up to 180°.
If one is 40°, then the other is (180° - 40°) = 140° .
None of those choices describes a plane.
Choice 'C' is the only example of a plane.
solution:
Using Cartesian co-ordinate system
Final velocity =v= -4m/s
Initial velocity = u
Acceleration a = m/s²
Time (t).= 60s
By the first kinematical equation
V= u +at
U = v – at
=(-4)-(-3)(60)
176m/s
So, initial velocity was 176m/s
