Answer:
695.87 Hz
Step-by-step explanation:
Using the equation for Doppler shift, the frequency of the apparent sound is f' = f(v ± v')/(v ± v") where f = frequency of sound emitted by the plane's engine = 485 Hz, v = speed of sound in air = 330 m/s, v' = speed of crowd(detector) = 0 m/s (since the crowd are stationary) and v" = speed of plane(source) = 100 m/s
So, f' = f(v ± v')/(v ± v")
f' = f(v ± 0)/(v ± v")
f' = fv/(v ± v")
Since the source moves towards the detector, we use a minus a minus sign in the denominator to get a shift upwards in frequency since a shift upwards means the objects are moving closer to each other.
So,
f' = fv/(v - v")
Substituting the values of the variables into the equation, we have
f' = 485 Hz × 330 m/s/(330 m/s - 100 m/s)
f' = 160050 Hzm/s ÷ 230 m/s
f' = 695.87 Hz
Answer:
Roger will have to sleep 2.667 days.
Step-by-step explanation:
If Roger sleeps 3 / 8 of a day in one day.
Then for Roger to sleep the equivalent of one day he will have to sleep
![=\frac{1}{\frac{3}{8}} = \frac{8}{3} = 2\frac{2}{3} = 2.667\hspace{0.1cm} days](https://tex.z-dn.net/?f=%3D%5Cfrac%7B1%7D%7B%5Cfrac%7B3%7D%7B8%7D%7D%20%20%3D%20%5Cfrac%7B8%7D%7B3%7D%20%20%3D%202%5Cfrac%7B2%7D%7B3%7D%20%20%3D%202.667%5Chspace%7B0.1cm%7D%20days)
Answer:
70 degrees
Step-by-step explanation:
I think it is two. I’m sorry if I am wrong.
Answer:
2nd option
Step-by-step explanation: