3 years ago

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Physics

1 answer:

patriot [66]3 years ago

3 0

Answer: A

Explanation: Took the test

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By what factor must the amplitude of a sound wave be increased in order to increase the intensity by a factor of 9?a. 9 b. 2 c.

Marta_Voda [28]

Answer:

option D

Explanation:

given,

$intensity\ \alpha \ (Amplitude)^2$

increase the intensity by factor of 9

I₁ = I₀

I₂ = 9 I₀

now,

$\dfrac{I_1}{I_2}=\dfrac{A_1^2}{A_2^2}$

$\dfrac{I_0}{9I_0}=(\dfrac{A_1}{A_2})^2$

$(\dfrac{A_1}{A_2})^2=\dfrac{1}{9}$

$\dfrac{A_1}{A_2}=\dfrac{1}{3}$

A₂ = 3 A₁

hence, amplitude increase with the factor of 3

so, the correct answer is option D

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3 years ago

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What is the relationship between the force of gravity between two objects in regard to their mass and the distance between them?

Mashcka [7]

Answer:

Explanation:

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What is the weight of an astronaut who has a mass of 90 kg on the moon? (Note: acceleration due to gravity of the moon is 1.62 N

motikmotik

Answer:

W = 145.8 [N]

Explanation:

To solve this problem we must remember that weight is defined as the product of mass by gravity, in this case lunar gravity.

W = m*g

where:

m = mass = 90 [kg]

g = gravity acceleration = 1.62 [kg/m²]

W = 90*1.62

W = 145.8 [N]

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The gas used to fill party ballons contain only helium atoms .This make helium a(n).

Nata [24]

a gas

hope this is right

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Two asteroids in outer space collide, and stick together. The mass of each asteroid, and the velocity of each asteroid before th

Naddik [55]

Answer: (2) Use the Momentum Principle.

Explanation:

In fact, it is called the <u>Conservation of linear momentum principle,</u> which establishes the initial momentum $p_{i}$ of the asteroids before the collision must be equal to the final momentum $p_{f}$ after the collision, no matter if the collision was elastic or inelastic (in which the kinetic energy is not conserved).

In this sense, the linear momentum $p$ of a body is defined as:

$p=mV$

Where $m$ is the mass and $V$ the velocity.

Therefore, the useful approach in this situation is<u> option (2)</u>.

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3 years ago