#### Suppose an oncoming ambulance moving at 115 km/h emits a steady 785-Hz sound from its siren 50% Part (a) what frequency, in Hz, is received by a person watching the oncoming ambulance? The speed of sound on this day is 345 m/s Grade Summary Deductions Potential 0% 100% Submissions Attempts remaining: 3 (4% per attempt) detailed view tan() π ( cosO cotan0 asin) acos0 sin atan)acotan() sinh0 cosh0 n cotanh0 Degrees O Radians 0 Submit Hint I give up! Hints: 4% deduction per hint

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# Suppose an oncoming ambulance moving at 115 km/h emits a steady 785-Hz sound from its siren 50% Part (a) what frequency, in Hz, is received by a person watching the oncoming ambulance? The speed of sound on this day is 345 m/s Grade Summary Deductions Potential 0% 100% Submissions Attempts remaining: 3 (4% per attempt) detailed view tan() π ( cosO cotan0 asin) acos0 sin atan)acotan() sinh0 cosh0 n cotanh0 Degrees O Radians 0 Submit Hint I give up! Hints: 4% deduction per hint. Hints remaining: 1 Feedback: 5% deduction per feedback Submission History Answer Hints Feedback Totals 0% Totals 0% 0% 0% -Δ 50% Part (b) what frequency, in Hz, does she observe after the ambulance has passed?

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