Which of the following requirements must be present to hear a sonic boom?

Physics

1 answer:

Lorico [155]3 years ago

6 0

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

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Two boxes of masses 3M and 5M are attached by a massless rope. They are being pulled to the right with a constant force of P = 8

Makovka662 [10]

Answer:

a) about 14.577 kg

b) 300 N

Explanation:

b) In order for the acceleration to be the same for each mass, the 800 N force must be divided between the boxes in proportion to their mass. That is, the net force on the 5M mass must be 5/8 of the total force, or 500 N. Then the tension in the rope is 800 N -500 N = 300 N, which is 3/8 of 800 N.

Tension: 300 N

a) The total mass is 8M, and the total normal force on the floor is ...

F = ma = (8M)(9.8 m/s^2)

The friction force is 0.7 times this, and is equal to the 800 N force pulling on the boxes.

800 N = (8M)(9.8 m/s^2)(0.7)

M = 800/(8·9.8·0.7) kg ≈ 14.577 kg

3 0

3 years ago

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kramer

Answer:

Explanation: