3 years ago

The loudness of a person's voice depends on the ________.

Physics

1 answer:

e-lub [12.9K]3 years ago

7 0

I believe the answer is vocal chords.

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Hi there!

We can begin by doing a summation of forces for each block.

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This block has the force of tension (in direction of acceleration +) and static friction (opposite direction -) acting on it. Thus:

$\Sigma F_A = T - F_s\\\\m_Aa = T - \mu m_Ag$

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This block has the force of tension (opposite of acc. -) and gravity (in direction of acc +), working on it.

$\Sigma F_B = m_Bg - T\\\\ m_Ba = m_Bg - T$

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To find the minimum value, we can set a = 0, so:

$0 = m_Bg - \mu m_Ag\\\\\mu m_Ag = m_B g\\\\0.8(20)(9.8) = m_B (9.8)\\\\m_B = \frac{0.8(20)(9.8)}{9.8)} = \boxed{16 kg}$

The block must weigh <u>> 16 kg</u> for block A to move.

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