Recall that

The car starts from rest, so
, and we get

"decreasing the distance of the space shuttle from Earth"
F = Gm(1)m(2)/R²
where R is the distance between the 2 objects, as it decreases, the force increases.
Answer:
The magnitude of their velocities will be the same but their direction will be reversed.
Answer:
The power is 
Explanation:
From the question we are told that
The distance from the siren is 
The intensity level is 
The threshold of hearing is 
Generally the intensity level is mathematically represented as
![\beta = 10dB * log [\frac{I}{I_o} ]](https://tex.z-dn.net/?f=%5Cbeta%20%20%3D%20%2010dB%20%2A%20log%20%5B%5Cfrac%7BI%7D%7BI_o%7D%20%5D)
Where I is the intensity at which the siren radiates the sound
substituting values
![49 = 10 * log [\frac{I}{1.0 *10^{-12}} ]](https://tex.z-dn.net/?f=49%20%20%3D%20%2010%20%2A%20log%20%5B%5Cfrac%7BI%7D%7B1.0%20%2A10%5E%7B-12%7D%7D%20%5D)
=> 
Now the amount of power the siren put out is mathematically evaluated as

Where A is the area of the siren which is taken as a sphere and it is mathematically evaluated as
So

substituting values


I think that it is a mixture because air can contain anything.