3 years ago

What is the name of the device used to measure wind speed?

Physics

1 answer:

Ugo [173]3 years ago

5 0

The device used to measure wind speed is called an anemometer

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3 years ago

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The 45-g arrow is launched so that it hits and embeds in a 1.40 kg block. The block hangs from strings. After the arrow joins th

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Question: How fast was the arrow moving before it joined the block?

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The arrow was moving at 15.9 m/s.

Explanation:

The law of conservation of energy says that the kinetic energy of the arrow must be converted into the potential energy of the block and arrow after it they join:

$\dfrac{1}{2}m_av^2 = (m_b+m_a)\Delta Hg$

where $m_a$ is the mass of the arrow, $m_b$ is the mass of the block, $\Delta H$ of the change in height of the block after the collision, and $v$ is the velocity of the arrow before it hit the block.

Solving for the velocity $v$ , we get:

$v = \sqrt{\frac{2(m_b+m_a)\Delta Hg}{m_a} }$

and we put in the numerical values

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and simplify to get:

$\boxed{ v= 15.9m/s}$

The arrow was moving at 15.9 m/s

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3 years ago

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