Physics, 02.07.2020 22:01, myalee1419

A motorcycle and a police car are moving toward one another. The police car emits sound with a frequency of 523 Hz and has a speed of 32.6 m/s. The motorcycle has a speed of 13.6 m/s. Part A What frequency does the motorcyclist hear

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answered: betsylancer8071

The frequency the motorcyclist hears is 601.60 Hz

Explanation:

The Doppler effect is a physical phenomenon where an apparent change in wave frequency is presented by a sound source with respect to its observer.

The following expression is considered the general case of the Doppler effect:

$f'=f*\frac{v+-vR}{v-+vE}$

Where:

f ’, f: Frequency perceived by the receiver and frequency emitted by the emitter respectively. Its unit of measurement in the International System (S.I.) is hertz (Hz), which is the inverse unit of the second (1 Hz = 1 s-1)

v: propagation speed of the wave in the medium. It is constant and depends on the characteristics of the medium. In this case, the speed of sound in air is considered to be 34o m / s

vR, vE: Receiver and emitter speed respectively. Your unit of measure in the S.I. is the m / s

±, ∓:

The + sign is used:

In the numerator if the receiver approaches the sender .In the denominator if the emitter moves away from the receiver .

The sign - is used:

In the numerator if the receiver moves away from the sender .In the denominator if the emitter approaches the receiver.

In this case:

f: 523 Hz:v= 340 m/svR= 13.6 m/svE= 32.6 m/s The emitter approaches the receiver, so the + sign is used in the numerator and the - sign is used in the denominator.

Replacing:

$f'=523 Hz*\frac{340 m/s+13.6 m/s}{340 m/s-32.6 m/s}$

Solving:

$f'=523 Hz*\frac{353.6 m/s}{307.4 m/s}$

f' = 601.60 Hz

The frequency the motorcyclist hears is 601.60 Hz

answered: Guest

a solenoid is created by wrapping a l = 90 m long wire around a hollow tube of diameter d = 4.5 cm. the wire diameter is d = 0.9 mm. the solenoid wire is then connected to a power supply so that a current of i = 9 a flows through the wire.

randomized variablesl = 90 m

d = 4.5 cm

d = 0.9 mm

i = 9 a

write an expression for the number of turns, n, in the solenoid. you do not need to take into account the diameter of the wire in this calculation.

calculate the number of turns, n, in the solenoid.

write an expression for the length of the solenoid (l2) in terms of the diameter of the hollow tube d.

calculate the length of the solenoid (l2) in meters.

calculate the magnitude of the magnetic field at the center of the solenoid in teslas.

explanation:

answered: Guest

i believe the answer is a hope it and is correct

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A motorcycle and a police car are moving toward one another. The police car emits sound with a frequ...