The chemical properties of an element are determined by the configuration of its electrons in orbit around its nucleus. ... See a Periodic Table of the Elements. The number of protons in the nucleus of an atom is its Atomic Number.

3 0

3 years ago

In the nucleus ______________<br> tell cells what to do and how to change.

anyanavicka [17]

Answer:

i believe it is dna

Explanation:

if i remember correctly if the dna tells the cell what to do and how to do it

7 0

3 years ago

A cylindrical specimen of some metal alloy 11.1 mm (0.4370 in.) in diameter is stressed elastically in tension. A force of 14000

Burka [1]

To develop this problem it is necessary to apply the concepts related to the uni-axial deflection of bodies.

From the expression of Hooke's law we have to

$\sigma = E\epsilon$

Where,

E= Young's modulus

$\epsilon =$ The strain

And substituting P/A for stress and $\delta/L$ for strain gives that

$\frac{P}{A} = E\frac{\delta}{L}$

Where,

P = Force

A = Area

L = Length

Therefore this can be re-arranged to give

$\delta = \frac{PL}{AE}$

If we want to calculate the deformation per unit area then we can also rewrite the equation as

$\frac{delta}{L} = \frac{P}{AE}$

Replacing with our values we have to

$\frac{delta}{L} = \frac{14400}{(\pi/4 (11.1*10^{-3})^2)(100*10^9)}$

$\frac{delta}{L} = 0.001488$

Therefore the posion ratio would be

$\upsilon = \frac{\frac{\delta_{decreased}}{d}}{\frac{\delta_l}{L}}$

$\upsilon = \frac{\frac{7*10^{-3}}{11.1}}{0.001488}$

$\upsilon = 0.4238$

Therefore the Poisson's ratio for this material is 0.4238

4 0

3 years ago

What is heliocentric model?​

What is heliocentric model?