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lina2011 [118]
3 years ago
14

Name three methods that can be used to change the overall density of an object.

Physics
1 answer:
Gnesinka [82]3 years ago
6 0
<span> changing its shape
changing its mass
or changing its volume</span>
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3. The velocity of sound is 332 m/s. Answer the following questions:
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Answer:

20 Hz, 20000 Hz

0.0166 m, 16.6 m

Explanation:

The minimum frequency that a human ear can hear is 20 Hz

The maximum frequency that a human ear can hear is 20000 Hz.

v = Velocity of sound = 332 m/s

Wavelength is given by

\lambda=\dfrac{v}{f}\\\Rightarrow \lambda=\dfrac{332}{20}\\\Rightarrow \lambda=16.6\ \text{m}

The longest wavelength that can be heard by the human ear is 16.6 m

\lambda=\dfrac{332}{20000}\\\Rightarrow \lambda=0.0166\ \text{m}

The shortest wavelength that can be heard by the human ear is 0.0166 m.

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2 years ago
A skillet is removed from an oven whose temperature is 450°F and placed in a room whose temperature is 70°F. After 5 minutes, th
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A geosynchronous satellite moves in a circular orbit around the Earth and completes one circle in the same time T during which t
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Explanation:

The time period of geosynchronous satellite must be equal to T .

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orbital velocity  V₀ =  \sqrt{\frac{GM}{( R+h)} }

Time period T = 2π( R + h ) / V₀

= 2π( R + h ) x \sqrt{\frac{( R+h)}{GM } }

\frac{T^\frac{2}{3}(GM)^\frac{1}{3}  }{(2\pi )^\frac{2}{3} } = R +h

h = \frac{T^\frac{2}{3}(GM)^\frac{1}{3}  }{(2\pi )^\frac{2}{3} } - R.

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What quantity does a Percent measure?
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In mathematics, a percentage is a number or ratio expressed as a fraction of 100.

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Ruthford's theory was identified by
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