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3 years ago

Which of these is NOT a common building material?

Physics

2 answers:

Over [174]3 years ago

8 0

B Quartz. Will be your answer of thia

Bingel [31]3 years ago

8 0

Hey there

the answer is

B.quartz

thank you

OFFICIALLYSAVAGE2003

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1. A huge spool of wire, 10,000 meters long, weighs 81.34 N. You cut off a meter or so and tie it between two posts, 0.660 m apa

WARRIOR [948]

Answer:

The beat frequency is 6.378 Hz.

Explanation:

Given that,

Length of wire = 10000 m

Weight = 81.34 N

Distance = 0.660 m

Tension = 52 N

Frequency = 196 Hz

We need to calculate the mass of the wire

Using formula of weight

$W= mg$

$m = \dfrac{W}{g}$

Put the value into the formula

$m=\dfrac{81.34}{9.8}$

$m=8.3\ kg$

The mass per unit length of the wire

$m_{l}=\dfrac{m}{l}$

Put the value into the formula

$m_{l}=\dfrac{8.3}{10000}$

$m_{l}=8.3\times10^{-4}\ kg/m$

We need to calculate the frequency in the wire

Using formula of frequency

$f_{w}=\dfrac{1}{2l}\sqrt{\dfrac{T}{m_{l}}}$

Put the value into the formula

$f_{w}=\dfrac{1}{2\times0.660 }\sqrt{\dfrac{52}{8.3\times10^{-4}}}$

$f_{w}=189.62\ Hz$

We need to calculate the beat frequency

Using formula of beat frequency

$f_{b}=f_{in}-f_{w}$

Put the value into the formula

$f_{b}=196-189.622$

$f_{b}=6.378\ Hz$

Hence, The beat frequency is 6.378 Hz.

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3 years ago

When three 30-ohm resistors are connected in parallel across a 9-volt source, the total current is

PSYCHO15rus [73]

—-Answer in photo :)

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2 years ago

A force is applied to a 2.9 kg mass and pro-

adoni [48]

Answer:

5.8 or 5.77

Explanation:

I'm not sure

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3 years ago

Which of the following statements is correct regarding the polarization of a neuronal membrane and the formation of a resting me

natka813 [3]

It seems that you have missed the necessary options for us to answer this question so I had to look for it. Anyway, here is the answer. The statement that is correct regarding the polarization of a neuronal membrane and the formation of a resting membrane potential is this: <span>Sodium/Potassium pumps maintain concentration gradients; sodium and potassium move down their concentration gradients through leakage channels.</span>

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3 years ago

What is the frequency of a pendulum that is moving at 30 m/s with a wavelength of 0.35

Kitty [74]

V=f*wavelength
30m/s=f*(0.35m)
f=85.7 Hz

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3 years ago

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