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Gelneren [198K]
3 years ago
9

13. A burglar alarm is wailing with a frequency of 1200. hertz. What

Physics
1 answer:
Ira Lisetskai [31]3 years ago
7 0

Answer:

Frequency heard by the police is 1336 Hz

Explanation:

As we know that the speed of sound in air is given as

v = 332 + 0.6 t

now we know that

t = 35 degree C

so we have

v = 332 + 0.6(35)

v = 353 m/s

now we know that if source and observer moves relative to each other then the observed frequency by the observer is given as

f' = f(\frac{v + v_o}{v})

f' = 1200(\frac{353 + 40}{353})

f' = 1336 Hz

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Answer:

Diffraction.

Explanation:

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3 years ago
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First, you will investigate purely vertical motion. The kinematics equation for vertical motion (ignoring air resistance) is giv
AlladinOne [14]

Answer: It takes 2.85 seconds.

Explanation: according to the question, the kinematics equation for vertical motion is

y(t) = y_{0} + v_{0} .t - \frac{1}{2} .gt^{2}

y₀ is the initial postion and equals 0 because it is fired at ground level;

v₀ is the initial speed and eqauls 14m/s;

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y(t) is the final position and equals 0 because it is when the pumpkin hits the ground;

Rewriting the equation, we have:

0 + 14t - \frac{1}{2}.9.8.t^{2} = 0

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t(14 - 4.9t) = 0

For this equation to be zero,

t = 0 or

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- 4.9t = - 14

t = \frac{14}{4.9}

t = 2.86

It takes 2.86 seconds for the pumpkin to hit the ground.

6 0
3 years ago
Oxygen (O) is a gas found in the 16th column of the periodic table. What statement is true about oxygen and the other elements i
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What is necessary for differentiation to occur in a planet?
Vesnalui [34]

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2. Differences in densities

3. Thermal diffusion

4. Collision of large bodies

Chemical Differentiation accounts for differences in chemical compositions of different materials.

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3 years ago
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Explanation:

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Hope this helps you! Have a good day! ^-^

6 0
3 years ago
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