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ANEK [815]
2 years ago
8

While practicing the trumpet you notice that every time you play a particular note a window in the room rattles. How can you exp

lain this rattling in terms of wave behaviors?
Physics
1 answer:
kherson [118]2 years ago
7 0
The sound waves travel because of the pitch of the note so the window rattles.
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A ball is thrown horizontally from a 90 m cliff and strikes the ground 70 m from the base, what is the initial velocity?
mash [69]

Answer:

The initial velocity is 16 m/s

Explanation:

The position of the ball at a time t is given by the following vector:

r = (x0 + v0x · t, y0 + v0y · t + 1/2 · g · t²)

Where:

r = position vector at time t

x0 = initial horizontal position

v0x = initial horizontal velocity

t = time

y0 = initial vertical position

v0y = initial vertical velocity

g = acceleration due to gravity (-9.8 m/s² considering the upward direction as positive)

When the ball reaches the ground its position vector will be "r final" (see attached figure). The x-component of this vector is 70 m and the y-component is -90 m. Notice that the origin of the frame of reference is located at the throwing point (y0 and x0 = 0).  Then, we can use the equations for the x and y-component of "r" to obtain the time of flight and the initial velocity:

Using the equation for the y-component of the vector position:

y = y0 + v0y · t + 1/2 · g · t²        (y0 and v0y = 0)

-90 m = -1/2 · 9.8 m/s² · t²

-2 · -90 m/ 9.8 m/s² = t²

t = 4.3 s

Using the equation for the x-component of the vector position:

x = x0 + v0x · t

70 m = v0x · 4.3 s

v0x = 16 m/s

The initial velocity is 16 m/s

7 0
2 years ago
The law of reflection applies to ONLY totally reflected waves.<br> Is it true or false
saw5 [17]
The answer is T. B.
8 0
2 years ago
A hiker walks 2.00 km north and then 3.00 km east, all in 2.50 hours. Calculate the magnitude and direction of the hiker’s (a) d
tino4ka555 [31]

Answer:

Incomplete third question

I think it should be

C. What was her average speed

Explanation:

Check attachment for solution

5 0
3 years ago
Why does a star grow larger after it exhausts its core hydrogen?
arlik [135]

Because Helium fusion in a shell outside the core generates enough thermal pressure to push the upper layers outward.

4 0
3 years ago
If this plastic cup is heated to its melting
Oduvanchick [21]

Answer:

A. The particles will begin to move enough

that they slide past each other.

Explanation:

When the plastic cup is heated, the Kinetic energy of its particles starts increasing. As the temperature rises, the kinetic energy keeps increasing. With the increase of K.E, the particles start moving faster and faster. When the temperature finally reaches the melting point, the K.E of the molecules is enough to break the bonds and slide past each other.

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2 years ago
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