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3 years ago

What was the significant change that Glenn Seaborg made to Mendeleev’s periodic table?

Physics

1 answer:

stira [4]3 years ago

7 0

Answer:

The Seaborg introduced the whole new row to the periodic table called actinides.

Explanation:

The american scientist Glenn Seaborg has many important contribution the chemistry. His work made a significant change in the mendeleev's periodic table. He introduced new row that is placed below the lanthanides row, called actinides.

He was co-discoverer or principle discoverer of plutonium and einsteinium. He was responsible for the discovery of more than 100 medical isotopes.

Thus, the Seaborg introduced the whole new row to the periodic table called actinides.

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Give an example of when a conscientious objector might exercise their right:

Mariana [72]

Am sorry what can you be more specific

7 0

3 years ago

Which division of time on the geologic time scale is the shortest?

Scrat [10]

Explanation:

In geology, there are 5 divisions of time on the time scale. They are:

eons
eras
periods
epochs
ages

Eons are the largest time period, while ages are the shortest time period. The rest of the above listed are in between the two.

8 0

3 years ago

Sixty identical drippers, each with a hole of diameter 1.00 mm, are used to water a yard. If the water in the main pipe of diame

VashaNatasha [74]

Answer:

$V = 5.30 *10^{-2} \ m^3$

$v_1 = 0.3127 \ m/s$

Explanation:

From the question we are told that

The number of identical drippers is n = 60

The diameter of each hole in each dripper is $d = 1.0 \ mm = 0.001 \ m$

The diameter of the main pipe is $d_m = 2.5 \ cm = 0.025 \ m$

The speed at which the water is flowing is $v = 3.00 \ cm/s = 0.03 \ m/s$

Generally the amount of water used in one hour = 3600 seconds is mathematically represented as

$V = A * v * 3600$

Here A is the area of the main pipe with value

$A = \pi * \frac{d^2}{4}$

=> $A = 3.142 * \frac{0.025^2}{4}$

=> $A = 0.0004909 \ m^2$

=> $V = 0.0004909 * 0.03 * 3600$

=> $V = 5.30 *10^{-2} \ m^3$

Generally the area of the drippers is mathematically represented as

$A_1= n * \pi \frac{d^2}{4}$

=> $A_1 = 60 * 3.142 * \frac{0.001 ^2}{4}$

=> $A_1 = 4.713 *10^{-5} \ m^2$

Generally from continuity equation we have that

$Av = A_1 v_1$

=> $0.0004909 * 0.03 = 4.713 *10^{-5} * v_1$

=> $v_1 = 0.3127 \ m/s$

3 0

3 years ago

The place kicker on a football team kicks a ball from ground level with an initial speed of 5.80 m/s at an angle of 17.0° above

Likurg_2 [28]

Answer:

0.34 s

Explanation:

Given that,

Initial speed of a ball, u = 5.8 m/s

It is kicked at an angle of 17.0° above the horizontal.

The vertical component of velocity will be,

$u_y=u\sin\theta\\\\=5.8\times \sin 17\\\\=1.69\ m/s$

Let it takes t time in the air before it lands on the ground again. It can calculated as :

$t=\dfrac{2u_y}{g}\\\\t=\dfrac{2\times 1.69}{9.8}\\\\t=0.34\ s$

So, it will take 0.34 seconds.

8 0

3 years ago

Which evidence supports the big bang theory? Select three options.

tatiyna

`1.Many galaxies exist.

3.Most galaxies are moving away from us.

4.Uniform background radiation is detected in every direction.

Explanation:

The Big bang theory is a theory explaining the formation of the universe from the early stages to today.According to the theory , the universe started as a hot ,small , & dense super-force with no singularity(atom, structure, form).The evidence of this theory include;

systematical shifting of the galaxies away from us
A radiation called cosmic microwave background radiation only explained by the theory
Larger redshifts causing great drop off in the number of quasar
Abundance of different elements in the universe such as hydrogen and lithium checked through spectra of oldest stars and gas clouds.

Learn More

Big bang theory:brainly.com/question/1581355

Keywords: evidence, supports, Big bang theory

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8 0

3 years ago