2 years ago

The first periodic table of elements Mendeleev created contained how many elements

1 answer:

6 0

Mendeleev created a periodic table with 63 initial elements.
He left gaps for unknown elements.
To this date, there are 118 elements in the periodic table.

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What's the symbol for an ionized gallium atom?

babunello [35]

Hi there!

Gallium is chemical element 31, (meaning 31 protons, 31 electrons).

The symbol for Gallium is "Ga"

Hope this helps you!

~DoctorLex

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2 years ago

A wave has 25 wavelengths in 5 secs. The frequency of the wave is _.

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1 year ago

Suppose the block is released from rest with the spring compressed 5.00 cm. The mass of the block is 1.70 kg and the force const

IRISSAK [1]

First, let's calculate the total mechanical energy when the block is at rest and the spring is compressed 5 cm:

$\begin{gathered} ME=PE+KE\\ \\ ME=\frac{kx^2}{2}+\frac{mv^2}{2}\\ \\ ME=\frac{955\cdot0.05^2}{2}+0\\ \\ ME=1.194\text{ J} \end{gathered}$

Now, let's use this total energy to calculate the velocity when the spring is compressed by 2.5 cm:

$\begin{gathered} ME=PE+KE\\ \\ 1.194=\frac{kx^2}{2}+\frac{mv^2}{2}\\ \\ 2.388=955\cdot0.025^2+1.7v^2\\ \\ 1.7v^2=2.388-0.597\\ \\ 1.7v^2=1.791\\ \\ v^2=\frac{1.791}{1.7}\\ \\ v^2=1.0535\\ \\ v=1.026\text{ m/s} \end{gathered}$

Therefore the speed is 1.026 m/s.

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7 months ago

PLEASE HELP URGENT!!!!!!!!!!!!!

Nimfa-mama [501]

c i think sorry if wrong

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2 years ago

Which process is a form of mechanical weathering?

ICE Princess25 [194]

I would assume it is Oxidation since it would have an impact on metals t hat oxidizes in the weather

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