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3 years ago

What happens when a mechanical wave runs through a medium?

1 answer:

Volgvan3 years ago

3 0

Once this initial energy is added, the wave travels through the medium until all its energy is transferred. In contrast, electromagnetic waves require no medium, but can still travel through one.

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A denisty of a bottle weighs 0.25N when empty & 0.75N when filled with water & 0.65N when filled with alcohol. Calculate

Ulleksa [173]

Answer:

$0.05\times 10^{-3}\ \text{m}^3$

$800\ \text{kg/m}^3$

Explanation:

$W_b$ = Weight of bottle = 0.25 N

$W_w$ = Weight of water = $0.75-0.25=0.5\ \text{N}$

g = Acceleration due to gravity = $10\ \text{m/s}^2$

$\rho_w$ = Density of water = $1000\ \text{kg/m}^3$

Mass of water

$m_w=\dfrac{W_w}{g}\\\Rightarrow m_w=\dfrac{0.5}{10}\\\Rightarrow m_w=0.05\ \text{kg}$

Volume is given by

$V_w=\dfrac{m_w}{\rho_w}\\\Rightarrow V_w=\dfrac{0.05}{1000}\\\Rightarrow V_w=0.05\times 10^{-3}\ \text{m}^3$

Volume of the bottle is $0.05\times 10^{-3}\ \text{m}^3$ .

This means that the alcohol will take the same amount of volume.

$W_a$ = Weight of alcohol = $0.65-0.25=0.4\ \text{N}$

Mass of alcohol

$m_a=\dfrac{0.4}{10}\\\Rightarrow m_a=0.04\ \text{kg}$

Density is given by

$\rho=\dfrac{m_a}{V_w}\\\Rightarrow \rho=\dfrac{0.04}{0.05\times 10^{-3}}\\\Rightarrow \rho=800\ \text{kg/m}^3$

Density of alcohol is $800\ \text{kg/m}^3$

7 0

3 years ago

What are the difference of meteor and meteorides ?

DerKrebs [107]

Answer:

When meteoroids enter Earth's atmosphere (or that of another planet, like Mars) at high speed and burn up, the fireballs or “shooting stars” are called meteors. When a meteoroid survives a trip through the atmosphere and hits the ground, it's called a meteorite.

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3 years ago

Euglenoids are freshwater protist that are both photosynthetic and?

frozen [14]

Euglenoids are freshwater protists that are both photosynthetic and heterotrophic

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4 years ago

Fungi are either _____ (dead, saprophytes, autotrophs) or _____ (alive, parasites, saprophytes)

mrs_skeptik [129]

Fungi are either saprophytes or parasites

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4 years ago