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gregori [183]
3 years ago
5

In 2-3 complete sentences, explain the relationship between speed, frequency, and wavelength.

Physics
1 answer:
Ahat [919]3 years ago
7 0
The relationship of the speed of sound, its frequency, and wavelength is the same as for all waves: vw = fλ, where vw is the speed of sound, f is its frequency, and λ is its wavelength. ... The frequency is the same as that of the source and is the number of waves that pass a point per unit time.
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An athlete is running a 400m race around a 400m track. On the backstretch the athlete's velocity is 8m/s but he is running into
Aleksandr-060686 [28]

Answer:

33 N

Explanation:

v = Velocity of fluid = 8+2 = 10 m/s

\rho = Density of fluid = 1.2 kg/m³

C = Coefficient of drag = 1.1

A = Cross sectional area = 0.5 m²

Drag force is given by

F=\frac{1}{2}\rho CAv^2\\\Rightarrow F=\frac{1}{2}\times 1.2\times 1.1\times 0.5\times (8+2)^2\\\Rightarrow F=33\ N

The drag force on the athlete is 33 N

3 0
3 years ago
Describe how you determine whether an object is in motion
PolarNik [594]

To determine whether an object is in motion or not, you first
need to specify a reference point, because there's no such
thing as "real" motion, only motion relative to something.

Once you've named the reference point, you have to look at
the object at two different times.  Each time you look at it, you
measure its distance and direction from the reference point. 
If there's any difference in these measurements from one time
to the next, then the object has had average motion during the
period between the two observations.

That's the best you can do ... find average motion during some
period of time.  You can never definitely tell whether or not the
object ever stopped during that time.  But you can sneak up on
it by making the time period between the two observations shorter
and shorter.

6 0
3 years ago
Define the following words:
qwelly [4]
Taxonomy: the techniques of describing,naming and classifying living organisms on the basis of similarities and dissimilarities

Prokaryote: prokaryotes were the earliest living organisms which are unicellular having a primitive nucleus i.e they don’t have a true nucleus

Virus: viruses are non cellular parasitic entities. They cannot live or reproduce outside of living cells since they lack machinery to do so by themselves. They range in size from 20nm to 250nm
7 0
3 years ago
Winds are named based on different factors how are winds usually named
lina2011 [118]
The winds are usually named based on the compass direction the wind is blowing from.
6 0
4 years ago
Consider a particle of mass m which can move freely along the x axis from -a/2 to a/2, but which is strictly prohibited from bei
nalin [4]

Answer:

  φ = B sin (2π n/a   x)

Explanation:

In quantum mechanics when a particle moves freely it implies that the potential is zero (V = 0), so its wave function is

     φ = A cos kx + B sin kx

we must place the boundary conditions to determine the value of the constants A and B.

In our case we are told that the particle cannot be outside the boundary given by x = ± a / 2

therefore we must make the cosine part zero, for this the constant A = 0, the wave function remains

    φ = B sin kx

the wave vector is

      k = 2π /λ

now let's adjust the period, in the border fi = 0 therefore the sine function must be zero

         φ (a /2) = 0

          0 = A sin (2π/λ  a/2)

therefore the sine argument is

          2π /λ   a/2 = n π

          λ= a / n

we substitute

          φ = B sin (2π n/a   x)

7 0
3 years ago
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