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murzikaleks [220]

3 years ago

11

a model of a plane in different parts of the atmosphere uses a scale of 1:4,000. if a plane flies at an altitude of 2,000 feet,

how high above ground level is the plane in the model?

2 answers:

Hoochie [10]3 years ago

7 0

Answer:

2ft

Explanation:

emmasim [6.3K]3 years ago

4 0

Answer: D, 0.5 ft

Explanation: Apex learning

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If the spring constant is doubled, what value does the period have for a mass on a spring? A. The period would double by square

antoniya [11.8K]

Answer:

The period would decrease by sqrt(2)

Explanation:

The restoring force is given by,

F = -kx

According to Newton's second law of motion,

ma = -kx

ma + kx = 0

The time period is given by,

T = $\frac{2\pi }{\omega }$

Where $\omega$ is the angular velocity and it is given by,

$\omega$ = $\sqrt{\frac{k}{m} }$

Now if the spring constant is doubled then,

$k_{2} = 2k$

Thus,

$T_{2}$ = $\frac{2\pi }{\sqrt{\frac{2k}{m} } }$

$\frac{T_{2} }{T} = \frac{\frac{2\pi }{\sqrt{\frac{2k}{m} } }}{\frac{2\pi }{\sqrt{\frac{k}{m} } }}$

$\frac{T_{2} }{T} = \sqrt{\frac{k}{2k} } = \sqrt{\frac{1}{2} }$

$T_{2} = \frac{T}{\sqrt{2} }$

Thus, The period would decrease by sqrt(2).

Hence, option D is correct.

3 0

2 years ago

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A metre rule is used to measure a length. Which reading is shown to the nearest millimetre? A 0.7m B 0.76m C 0.761m D 0.7614m

Cloud [144]

Answer:

none

Explanation:

~both of them show to the nearest metre.

~millimeter has (mm) unit eg 0.7mm

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3 years ago

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Damian is texting while driving and ends up slamming into the back end of the car in front of him, which then strikes the car in

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The answer for this question is negative externality

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Lightwaves travel from the air into a lens made of glass. Their velocity decreases as they enter the glass. How does this affect

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The waves become longer but slower

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Galina-37 [17]

Answer:

100nm

Explanation:

Work=Force×distance

=20×5

=100nm

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2 years ago