ghostshadow1
05.05.2020 •
Physics
One day when the speed of sound in air is 343 m/s, a fire truck traveling at vs = 34 m/s has a siren which produces a frequency of fs = 449 Hz. Randomized Variables vS = 34 m/s f = 449 Hz show answer No Attempt 50% Part (a) What frequency (in Hertz) does the driver of the truck hear? fd = | sin() cos() tan() cotan() asin() acos() atan() acotan() sinh() cosh() tanh() cotanh() Degrees Radians π ( ) 7 8 9 HOME E ↑^ ^↓ 4 5 6 ← / * 1 2 3 → + - 0 . END √() BACKSPACE DEL CLEAR Grade Summary Deductions 0% Potential 100% Submissions Attempts remaining: 3 (4% per attempt) detailed view Hints: 4% deduction per hint. Hints remaining: 1 Feedback: 5% deduction per feedback. No Attempt No Attempt 50% Part (b) What frequency (in Hertz) does an observer hear when the truck is moving away?
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Ответ:
a) 449 Hz b) 409 Hz
Explanation:
a)
As the driver is moving at v=0 related to the truck, he hears the same frequency that the siren is producing, i.e., 449 Hz.b)
For the observer at rest, the frequency that he hears, is modified due to the truck is moving away from him at v= 34 m/s, so the Doppler Effect is present.The Doppler Effect says that the perceived frequency f' is related with the actual frequency f by the following equation:Ответ:
156.8 Joules
Explanation:
Work = Force x Displacement
Displacement = 2m
Force (force of gravity) = mass x acceleration due to gravity = 8Kg x 9.8m/s^2
= 78.4N
Work = FxD
Work = 78.4 N x 2m
Work = 156.8 N·m OR 156.8 Joules