Its false I got It right .
Answer:
Speed of the hawk, v = 40.4 m/s
Explanation:
It is given that,
Exact frequency of the female, f = 785 Hz
Observed frequency of female, f' = 890 Hz
Speed of sound, v = 343 m/s
Let v' is the speed of the hawk. It is based on the concept of Doppler's effect. We know that when the object approaches you, its speed is given by :


v' = 40.4 m/s
So, the speed of the hawk is 40.4 m/s. Hence, this is the required solution.
Answer:

Explanation:
<em>Assuming that the thermal expansion of brass cube occurs isotropically (i.e. equal in all the directions).</em>
Given:
- length of the cube,

- change in temperature of the cube,

- coefficient of volume expansion,

<u>Hence volume of the cube:</u>

Now the volume of the cube after expansion:



Therefore,

<u>Now the percentage change in the edges of the cube:</u>



Answer: the answer should be 6,720 decameters.