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sweet [91]
4 years ago
14

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. ...

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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

3 0
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

7 0
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.

3 0
3 years ago
A substance maintaining a uniform appearence throught is called
BabaBlast [244]
A substance maintaining a uniform appearance throught is called homogeneous
6 0
4 years ago
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