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3 years ago

If the fan blades rattle while the fan is turning, you can stop the noise by

Physics

2 answers:

zlopas [31]3 years ago

7 0

Answer:oiling the blades

Explanation:

victus00 [196]3 years ago

3 0

A. oiling the blades

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Hat processes lead to glacial erosion ?

azamat

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4 years ago

A mass weighing 24 pounds, attached to the end of a spring, stretches it 4 inches. Initially, the mass is released from rest fro

Oksi-84 [34.3K]

Answer:

the equation of motion is

$x(t) =-\frac{1}{6} \cos4\sqrt{6} t$

Explanation:

Given that,

The weight attached to the spring is 24pounds

Acceleration due to gravity is 32ft/s²

Assume x is the string length, 4inches

convert the length inches to to feet = 4/12 = 1/3feet

From Hookes law , we calculate the spring constant k

k = W / x

k = 24 / (1/3)

k = 24 / 0.33

k = 72lb/ft

If the mass is displace from its equilibrium position by amount x

the differential equation is

$m\frac{d^2x}{dt^2} + kx=0\\\\\frac{3}{4 } \frac{d^2x}{dt^2}+72x=0\\$

$\frac{d^2x}{dt^2} +96x=0$

Auxiliary equation is

$m^2+96=0\\m=\sqrt{-96} \\m=\_ ^+4\sqrt{6}$

Thus the solution is,

$x(t) = c_1cos4\sqrt{6t} +c_2sin\sqrt{6t}$

$x'(t) =-4\sqrt{6c_1} sin4\sqrt{6t} +c_24\sqrt{6} cos4\sqrt{6t}$

The mass is release from rest

x'(0) = 0

$-4\sqrt{6c_1 } \sin4\sqrt{6} (0)+c_24\sqrt{6} \cos4\sqrt{6} (0)=0\\c_24\sqrt{6} =0\\\\c_2=0$

Therefore

x(t) = c₁ cos4 √6t

x(0) = -2inches

c₁ cos4 √6(0) = 2/12feet

c₁= 1/6feet

There fore, the equation of motion is

$x(t) =-\frac{1}{6} \cos4\sqrt{6} t$

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4 years ago

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Answer: 12 J

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What are the three main phases of matter and how are the particles aligned

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