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4 years ago

What is the atomic number of an atom

Physics

1 answer:

Sindrei [870]4 years ago

3 0

The atomic number of an atom is the number of protons in the nucleus of an atom.

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How can we prevent ear-problems often encountered by passengers after a flight journey?

slamgirl [31]

<u>Follow these tips to prevent ear-problems often encountered by passengers after a flight journey:-</u>

Yawn and swallow during ascent and descent. ...

Use the Valsalva maneuver during ascent and descent. ...

Don't sleep during takeoffs and landings. ...

Reconsider travel plans. ...

Use an over-the-counter nasal spray. ...

Use decongestant pills cautiously. ...

Take allergy medication.

3 0

3 years ago

Which electromagnetic waves have the greatest frequencies?

Ket [755]

Answer:

Gamma rays

Explanation:

Gamma rays have the highest frequency in the electro magnetic spectrum

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3 years ago

A 2.2-m-long steel rod must not stretch more than 1.2 mm when it is subjected to a 8.5-kN tension force. Knowing that E = 200 GP

kodGreya [7K]

Answer:

a) 0.00996 m

b) 109090909 Pa

Explanation:

Unit conversions:

$E = 200GPa = 200\times10^9 Pa$

1.2 mm = 0.0012 m

8.5 kN = 8500 N

If the 2.2m rod cannot stretch more than 0.0012 m, its maximum strain is

$\epsilon = \frac{\Delta L}{L} = \frac{0.0012}{2.2} = 0.000545455$

With elastic modulus being E = 200 GPa, then its maximum stress must be

$\sigma = E\epsilon = 200\times10^9*0.000545455 = 109090909 Pa$

Knowing the tension force being F = 8500 N, we can calculate the appropriate cross section area

$A = \frac{F}{\sigma} = \frac{8500}{109090909} = 7.79\times10^{-5}m^2$

And its corresponding diameter is

$A = \pi d^2/4$

$7.79\times10^{-5} = \pi d^2/4$

$d^2 = \frac{4*7.79\times10^{-5}}{\pi} = 9.92\times10^{-5}$

$d = \sqrt{9.92\times10^{-5}} = 0.00996 m \approx 1 cm$

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3 years ago

Which scientist is known for contributions to a scientific discipline that is different from that of the other three scientists?

Nookie1986 [14]

Archimedes is known for contributions to a scientific discipline that is different from that of the other scientists.

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3 years ago

A substance maintaining a uniform appearence throught is called

BabaBlast [244]

A substance maintaining a uniform appearance throught is called homogeneous

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4 years ago