You need to give the measurements
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
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Answer:
D) The velocity of the airplane must be greater than the speed of sound
Explanation:
Sonic boom is a phenomenon that occurs when an airplane travels ay a velocity greater than the speed of sound.
When this condition is met, the sound waves produced by the airplane (mainly from the engine) is not able to travel ahead of the plane, because the plane is moving at a greater speed than the sound itself; as a result, it is only transmitted behind the plane.
In this situation, a shock wave is produced. This shock wave is associated with a very loud "bang", that can be heard clearly even at several kilometers distance (in fact, supersonic planes are normally not allowed to fly over residential areas. In the past, for example the Concorde, was only allowerd to fly at supersonic speed over the ocean).
So the correct answer is
D) The velocity of the airplane must be greater than the speed of sound
T = 3.5 secs
Velocity (v) = g * t = 10 m/s^2 * 3.5 sec = 35 m/s