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3 years ago

A sound wave traveling eastward through air

Physics

2 answers:

Sholpan [36]3 years ago

6 0

Answer : A sound wave traveling eastward through air causes the air molecules to vibrate east and west

Explanation :

We know that the sound wave is a longitudinal wave. The particles of medium travels in the direction of propagation of the wave. The space where the particles are closely spaced is called compression and the space where the particles are far apart is called rarefaction. Also, the distance between two consecutive compression and rarefaction is called the wavelength.

If the sound wave is travelling in eastward direction, then the air molecules will move in the direction of propagation of wave. They will vibrate either in east or west direction.

So, the correct option is (1) " vibrate east and west ".

Wewaii [24]3 years ago

5 0

A sound wave traveling eastward through air<span> causes the air molecules to Vibrate east and west. </span>

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PLZ HELP

Sati [7]

Answer:

the index of refraction of the second medium is lower

Explanation:

take an exaple of a light ray from air to water that is optically denser the ray is refracted to the normal thus lowering its index of refraction

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3 years ago

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What do Rachel's actions reveal about her

nexus9112 [7]

Rachel from where ? a movie? book?

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3 years ago

A 0.260 m radius, 525 turn coil is rotated one-fourth of a revolution in 4.17 ms, originally having its plane perpendicular to a

Sophie [7]

Answer:

B = 0.37T

Explanation:

In order to calculate the needed magnitude of the magnetic force you use the following formula, which calculate the induced emf of the solenoid when there is a change in the magnetic flux:

$emf=-N\frac{\Delta \Phi_B}{\Delta t}=-N\frac{\Delta (BAcos\theta)}{\Delta t}$ (1)

emf: induced voltage in the solenoid = 10,000V

N: turns of the solenoid = 525

ФB: magnetic flux

B: magnitude of the magnetic field = ?

A: cross-sectional area of the solenoid = π*r^2

r: radius of the cross-sectional area = 0.260m

Δt: interval time of the change of the magnetic flux = 4.17ms = 4.17*10^-3s

First, you have the magnetic field direction perpendicular to the plane of the solenoid, after, the angle between them is 90° (quarter of a revolution)

In the equation (1) the only parameter that changes on time is the angle, then, you can solve for B from the equation (1):

$emf=-NBA\frac{cos(90\°)-cos(0\°)}{\Delta t}=\frac{NBA}{\Delta t}\\\\B=\frac{(\Delta t)(emf)}{NA}=\frac{(\Delta t)(emf)}{N(\pi r^2)}\\\\$

Finally, you replace the values of the parameters to calculate B:

$B=\frac{(4.17*10^{-3}s)(10000V)}{(525)(\pi(0.260m)^2)}=0.37T$

The strength of the magnetic field is 0.37T

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3 years ago

Which material is colder in a room where all the objects are in for a long time?

Ahat [919]

Wooden desk it doesn’t conduct or absorb heat as much as metal or plastic

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3 years ago

At t = 0, a car registers at 30 miles/hr. Forty seconds later, the car’s velocity is now at 50 miles/hr. Assuming constant accel

madreJ [45]

Answer: Choice A) 0.44 miles

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Work Shown:

1 hour = 60 minutes

1 minute = 60 seconds

1 hour = 60*60 = 3600 seconds

40 seconds = 40*(1/3600) = 40/3600 = 1/90 hours

The car travels 1/90 of an hour. Let t = 1/90.

The initial velocity is vi = 30 mph.

The final velocity is vf = 50 mph.

Apply one of the kinematics equations as given below.

x = distance traveled

x = 0.5*(vi+vf)*t

x = 0.5*(30+50)*(1/90)

x = 0.44444444444444 which is approximate

x = 0.44

The car traveled roughly 0.44 miles. This matches with choice A.

I'm assuming choice A is supposed to say 0.44 instead of 0.442; otherwise, I think your teacher made a typo by putting that 2 in there. Each of the other answer choices are accurate to 2 decimal places, so it would make sense that choice A is also accurate to 2 decimal places as well.

If 0.442 was intended by your teacher, and it's not a typo, then the answer would be E) None of the choices given.

8 0

3 years ago