Physics, 16.11.2019 01:31 leannehounschell

As you sit on a dock, you notice a wave crest pass. you count another four
wave crests in the next 12 seconds. what is the frequency of these waves?
a. 12 hz
b. 0.333 hz
c. 4 hz
d. 3 hz

Answers: 3

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Answer from: brendaesme

B) 0.333 Hz

Explanation:

Lets see what are the main properties of a wave

The frequency of a wave is the number of times per second that the wave cycles. - measured in Hertz (Hz)wave crest is shown in the figure.wavelength of a wave is the distance between corresponding points of two consecutive waves.The period of the wave is the time between wave crests The amplitude of a wave is a measure of the displacement of the wave from its rest position

observer sees 4 crests in 12 seconds

according to this , the number of crests he sees in a minute

$frequency=\frac{4}{12} =0.333 Hz$

As you sit on a dock, you notice a wave crest pass. you count another four wave crests in the next 1

Answer from: Quest

10 neutrons is the answer

Answer from: Quest

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

$f\alpha \frac{dp}{dt}$

⇒ $f= k \frac{dp}{dt}$

here k is the proportionality constant whose value is 1.

$f=\frac{dp}{dt}$

$f= \frac{d[mv]}{dt}$

$f= m\frac{dv}{dt} +v\frac{dm}{dt}$

$f=ma+v\frac{dm}{dt}$ [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.

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As you sit on a dock, you notice a wave crest pass. you count another four
wave crests in the...

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