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2 years ago

The discovery of what element showed the usefulness of Mendeleev’s periodic table?

2 answers:

7 0

A. Gallium

'cause he predicted it's physical properties before it's discovery! After that, it was proved that Mendeleev's periodic table was useful.

Hope this helps!

jekas [21]2 years ago

4 0

<h3><u>Answer;</u></h3>

A. Gallium

<h3><u>Explanation;</u></h3>

Mendeleev arranged the elements in rows in order of increasing mass so that elements with similar properties were in the same column.
<em><u>The discovery of new elements such as gallium demonstrated the usefulness of Mendeleev’s table because the close match between Mendeleev’s predictions and the actual properties of new elements showed how useful his periodic table could be. </u></em>
Mendeleev’s efforts more successful because he provided an organizing principle that worked for all off the known elements.

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Carts A and B have equal masses and travel equal distances D on side-by-side straight frictionless tracks while a constant force

GarryVolchara [31]

Answer:

The velocity of cart B is $\sqrt{2}$ the velocity of cart A

Solution:

As per the question:

Let the masses of both the carts A and B be 'm' kg

Distance traveled by both the carts be 'D' m

Force acting on A be 'F' N

Force acting on B be '2F' N

Now,

The relation between the velocities of A and B can be derived as :

Acceleration of cart A, $a_{A} = \frac{F}{m}$

Acceleration of the cart B, $a_{B} = \frac{2F}{m} = 2[tex][a_{A}]$

Now, using the third eqn of motion for both the carts A and B:

For cart A:

$v_{A}^{2} = u_{A}^{2} + 2a_{A}D$

$v_{A} = \sqrt{2aD}$

$v_{B}^{2} = u_{B}^{2} + 2a_{B}D$

$v_{B}^{2} = 2(2a_{A})}D$

where

$u_{A} = u_{B} 0$ = initial velocity of cart A and cart B respectively

$v_{A}$ = final velocity of cart A

$v_{B}$ = final velocity of cart B

$v_{B} = \sqrt{4a_{A}}D$

Now, dividing the velocities of the cart A and B:

$\frac{v_{A}}{v_{B}} = \sqrt{\frac{1}{2}}$

$v_{B} = \sqrt{2}v_{A}$

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2 years ago

This table shows the acceleration due to gravity on four planets. Planet Gravity (m/s2) Earth 9.8 Mercury 3.7 Neptune 11.2 Uranu

son4ous [18]

Answer:

$\Large \boxed{\mathrm{Mercury, \ Uranus, \ Earth, \ Neptune}}$

Explanation:

Earth ⇒ 9.8 m/s²

Mercury ⇒ 3.7 m/s²

Neptune ⇒ 11.2 m/s²

Uranus ⇒ 8.9 m/s²

$W=m \times g$

$\sf {Weight=mass \times acceleration \ due \ to \ gravity}$

The weight of a person can differ on different planets, but the mass stays the same. The greater the acceleration due to gravity, the greater the weight.

Arranging the planets in increasing order based on a person’s weight on the planet:

Mercury, Uranus, Earth, Neptune

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2 years ago

Read 2 more answers

The space program contributes a great deal to enrich the lives of Floridians and beyond. One way that NASA brings an income to F

Ivan

Answer: Through tourism.

Explanation:

Since NASA space centre is located in Florida where NASA launches spaceflight, this is a huge tourist attraction for viewers in the United States and world entirely.

Florida generates income through people coming to view the launch of the spaceflight as tourism.

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2 years ago

Occupants in a single space shuttle in orbit feel weightless. describe a scheme whereby occupants in a pair of shuttles (or even

agasfer [191]

The scheme whereby occupants in a pair of shuttles is as follows
use a strong cable with large weight on the end
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2 years ago

How does an atom develop a positive charge

Dmitry [639]

<h3>♫ - - - - - - - - - - - - - - - ~Hello There!~ - - - - - - - - - - - - - - - ♫</h3>

➷ A normal atom has the same amount of electrons and protons, making it neutral. An atom develops a positive charge when it loses an electron(s). Once it loses an electron(s), there would now be more protons that electrons.

Short answer: by losing an electron(s)

➶ Hope This Helps You!

➶ Good Luck (:

➶ Have A Great Day ^-^

↬ ʜᴀɴɴᴀʜ ♡

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3 years ago