Answer:
You are driving at Vo= 15.2 m/s = 54.72 km/h
Explanation:
Δf= 72.1 Hz
f= 813 Hz
v= 343 m/s
Δf= f* [ (v-(-vo) / v) - ( v-(vo) / v) ]
clearing vo:
Vo= 15.2 m/s
The sound will approach the mountain at the same speed, v, irrespective of the speed of the rocket. This is because sound will always travel at the same speed as long as properties of air remain the same.
Therefore, sound will approach the mountain at velocity v in both 100 m/s and 200 m/s of the rocket.
To find for the input current, we use ratio and proportion concept. We use the equation:
I(input)/ I(output) = V(output)/ V(input)
I(input) / 1.8 A = 24 V / 120 V
I(input) = 0.36 A
Hope this answers the question. Have a nice day. Feel free to ask more questions.
