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3 years ago

Calculate the speed of a 3.5cm sound wave of frequency 8000Hz

Physics

2 answers:

LuckyWell [14K]3 years ago

8 0

The answer to this question is 2400Hz

Ganezh [65]3 years ago

8 0

In HZ the answer would be 2400

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Which is a negative effect of deforestation on the environment? A. habitat restoration B. desertification C. soil production D.

Alekssandra [29.7K]

Answer:Deforestation refers to the decrease in forest areas across the world that are lost for other uses such as agricultural croplands, urbanization, or mining activities. Greatly accelerated by human activities since 1960, deforestation has been negatively affecting natural ecosystems, biodiversity, and the climate. The UN’s Food and Agriculture Organization estimates the annual rate of deforestation to be around 1.3 million km2 per decade.

Explanation:

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3 years ago

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An eagle flying through the air is an example of _____.

Likurg_2 [28]

<span>So the question is what is an eagle flying trough the air an example of? Kinetic enegry, potential energy or released energy? So when we have a stationary object on some height h, that object has potential energy. When an object starts o change its altitude, the potential energy is transformed into kinetic energy. So the correct answer is kinetic energy because an eagle flying changes its height.</span>

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3 years ago

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A 97.3 kg horizontal circular platform rotates freely with no friction about its center at an initial angular velocity of 1.67 r

Yuliya22 [10]

Answer:

w = 1.14 rad / s

Explanation:

This is an angular momentum exercise. Let's define a system formed by the three bodies, the platform, the bananas and the monkey, in such a way that the torques during the collision have been internal and the angular momentum is preserved.

Initial instant. The platform alone

L₀ = I w₀

Final moment. When the bananas are on the shelf

we approximate the bananas as a point load and the distance is indicated

x = 0.45m

L_f = (m x² + I ) w₁

angular momentum is conserved

L₀ = L_f

I w₀ = (m x² + I) w₁

w₁ = $\frac{I}{m x^2 + I} \ w_o$

Let's repeat for the platform with the bananas and the monkey is the one that falls for x₂ = 1.73 m

initial instant. The platform and bananas alone

L₀ = I₁ w₁

I₁ = (m x² + I)

final instant. After the crash

L_f = I w

L_f = (I₁ + M x₂²) w

the moment is preserved

L₀ = L_f

(m x² + I) w₁ = ((m x² + I) + M x₂²) w

(m x² + I) w₁ = (I + m x² + M x₂²) w

we substitute

w = $\frac{m x^2 +I}{I + m x^2 + M x_2^2} \ \frac{I}{m x^2 + I} \ w_o$

w = $\frac{I}{I + m x^2 + M x_2^2} \ w_o$

the moment of inertia of a circular disk is

I = ½ m_p x₂²

we substitute

w = $\frac{ \frac{1}{2} m_p x_2^2 }{ \frac{1}{2} m_p x_2^2 + M x_2^2 + m x^2} \ \ w_o$

let's calculate

w = $\frac{ \frac{1}{2} \ 97.3 \ 1.73^2 }{ \frac{1}{2} \ 97.3 \ 1.73^2 + 21.9 \ 1.73^2 + 9.67 \ 0.45^2 } \ \ 1.67$

w = $\frac{145.60 }{145.60 \ + 65.54 \ + 1.958} \ \ 1.67$

w = 1.14 rad / s

5 0

3 years ago

The convex len called converging lens

olya-2409 [2.1K]

What is the question?

8 0

4 years ago

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The Jamaican bobsled team hit the brakes on their sled so that it decelerates at a uniform rate of 0.43 m/s^2. How long does it

topjm [15]

Answer: The distance covered by a certain object which is travelling at a certain speed is calculated through the equation,

d = (V₀)t + 0.5at²

where d is the distance, V₀ is the initial speed, a is deceleration, and t is the time. Substituting the known values,

85 = (V₀)(t) + (0.5)(-0.43 m/s)(t²)

Because we are not given with the initial velocity, our answer would remain as the equation which is written above.

Explanation: Hope this helps

3 0

3 years ago