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ludmilkaskok [199]

3 years ago

6

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

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.

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

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 110 kg ice hockey player skates at 3.0 m/s toward a railing at the edge of the ice and then stops himself by grasping the rail

velikii [3]

Answer:

Δ KE = -495 J

Explanation:

given,

mass of the ice hockey player = 110 Kg

initial speed = 3 m/s

final speed = 0 m/s

distance, d = 0.3 m

change in kinetic energy

$\Delta K E = \dfrac{1}{2}mv_f^2 - \dfrac{1}{2}mv_i^2$

$\Delta K E = \dfrac{1}{2}mv(0)^2 - \dfrac{1}{2}\times 110\times 3^2$

Δ KE = -495 J

Hence, the change in kinetic energy is equal to Δ KE = -495 J

7 0

3 years ago

Explain why the roller coaster’s potential energy is greater at point 1 than at point 4.

Virty [35]

Potential energy is directly related to the height of an object. Point 1 is higher than point 4, so the potential energy is greater at point 1.

3 0

3 years ago

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A loaf of bread is removed from an oven and is left sitting in the kitchen to cool. Its temperature t minutes after being remove

Darya [45]

<h2>Answer:</h2>

<em><u>(a). 73° C. </u></em>

<em><u>(b). 176° C.</u></em>

<em><u>(c). 93.02°C.</u></em>

<h2>Explanation:</h2>

In the question,

We have been given an equation,

$T(t) = 103e^{-0.0182t}+73.$

(a).

We need to find the temperature of the kitchen,

So,

Time, t → ∞

On putting the value of t as infinite in the equation we get,

$T(\infty)=103e^{-0.0182*\infty}+73\\T(\infty)=103*0+73\\T(\infty)=0+73\\T(\infty)=73\\$

<em><u>Therefore, the temperature of the Kitchen is 73° C. </u></em>

(b).

The initial temperature of the bread when it is removed from the oven is at, t = 0 s

So,

On putting the value of t = 0, we get,

$T(t) = 103e^{-0.0182t}+73.\\T(0)=103e^{-0.0182\times 0} + 73\\T(0)=103+73\\T(0)=176$

<em><u>Therefore, the initial temperature of the bread is 176° C.</u></em>

(c).

On putting the value of t = 90 minutes, we get,

$T(t) = 103e^{-0.0182t}+73.\\T(90)=103e^{-0.0182\times 90} + 73\\T(90)=20.0199+73\\T(90)=93.02$

<em><u>Therefore, the temperature of the bread after 90 minutes is 93.02°C.</u></em>

<em><u></u></em>

8 0

3 years ago

microwave ovens emit microwave energy with a wavelength of 12.5 cm. what is the energy of exactly one photon of this microwave r

viktelen [127]

Answer:

1.5891x10^-24

hope this helped :)

7 0

2 years ago

Facts or naw:<br> common sense is so rare that it should be a superpower

a_sh-v [17]

Naw! Common sense should be common which is why it's called common sense...

6 0

3 years ago

Read 2 more answers