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3 years ago

What is the primary atomic characteristic that Mendeleev used to organize the periodic table?

Physics

2 answers:

Fudgin [204]3 years ago

7 0

Atomic number is the answer

Svet_ta [14]3 years ago

6 0

Atomic mass is the primary atomic characteristic that Mendeleev used to organize the periodic table.

The atomic mass (ma) is the mass of an atomic particle, sub-atomic particle, or molecule. It is commonly expressed in unified atomic mass units (u) where by international agreement, 1 unified atomic mass unit is defined as 1/12 of the mass of a single carbon-12 atom (at rest).

The correct answer between all the choices given is the first choice or letter A. I am hoping that this answer has satisfied your query and it will be able to help you in your endeavor, and if you would like, feel free to ask another question.

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A 0.0130-kg bullet is fired straight up at a falling wooden block that has a mass of 1.58 kg. The bullet has a speed of 843 m/s

Genrish500 [490]

Answer:

0.352 s

Explanation:

Let g = 9.81 m/s2. Then the speed of the block after it's fall down a time t (seconds) before the collision is:

$v_o = gt$ (0)

Using the law of momentum conservation, the total momentum of the system after the collision must be same as before the collision. Let the upward be the positive direction:

$m_uv_u - m_ov_o = (m_u + m_o)v$ (1)

where $m_u = 0.013 kg, v_u = 843 m/s$ are the mass and speed of the bullet prior to the impact. $m_o = 1.58 kg$ is the mass of the block. v is the speed of the system after the impact. We will focus on v for the next part:

As the system raise and come to a momentarily halt on top of the building (speed at top $v_t = 0 m/s$ ), let the vertical distance travel be h (m). We have the following equation of motion

$v_t^2 - v^2 = 2gh$

$0^2 - v^2 = 2gh$

$v = \sqrt{2gh}$ (2)

As h is the same vertical distance that the block has fallen before the collision, we can solve for h in term of t:

$h = gt^2/2$ (3)

If we plug eq. (3) into (2):

$v = \sqrt{g^2t^2} = gt$ (4)

And plug eq (4) and (0) into eq (1), with all the numbers:

$0.013*843 - 1.58gt = (0.013 + 1.58)gt$

$10.959 = 3.173gt$

$t = \frac{10.959}{3.173*9.81} = 0.352 s$

7 0

4 years ago

Why did Aristotle's geocentric theory fail to match the expected predictions?

NNADVOKAT [17]

Aristotle's geocentric theory failed to match the expected predictions because a few celestial objects appear to have retrograde motion.

Answer: Option B

Explanation:

Aristotle’s theory states that all the bodies in universe rotate around the earth, and earth is located at the centre. But, the most serious challenge it was given was that, the difference found in the paths of revolution of mercury and Venus. They are revolving around the sun, and not the earth, periodically.

This is the significant drawback, and major factor for the Copernicus and the other models to be achieved. The mercury and Venus, closest planets to earth, and the sun too, are not following the earth’s path. And hence, upon studying clearly, all celestial bodies do not follow a path round the earth, but around a fireball, that is sun.

6 0

3 years ago

A projectile is launched at an angle above the

erica [24]

If we neglect friction/air resistance, then the horizontal component
doesn't change, and the vertical component becomes (9.8 m/s downward)
greater each second thanks to gravity.

So, after 2 seconds, the horizontal component is still 40 m/s, and the
vertical component is (30 - 2·9.8) = 10.4 m/s upward.

Choice #1 says this.

7 0

3 years ago

In a very busy off-campus eatery one chef sends a 201 g broccoli-tomato-pickle-onion-mushroom pizza sliding down the counter fro

Murrr4er [49]

Answer:

The correct answer is:

(A) to the left

(B) at speed -0.8725 m/s

Explanation:

The given values are:

Plate 1:

Mass,