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irga5000 [103]
3 years ago
11

Which of the following is the best definition of an element?

Physics
1 answer:
Ostrovityanka [42]3 years ago
8 0

Answer:

A. chemical substance whose atoms all have the same number of protons

Explanation:

An element is a substance which contains identical atoms that have the same number of protons in the nucleus.

Elements are arranged in the periodic table according to their atomic number (= number of protons): so atoms of different elements have a different number of protons in their nuclei.

For a neutral atom, the number of electrons around the nucleus is also equal to the number of protons.

Moreover, atoms of the same element can have a different number of neutrons, despite having the same number of protons - these atoms are called isotopes.

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What is the acceleration of a 5kg mass pushed by a 10N force?
dem82 [27]

Answer:2m/s^2

Explanation:

mass=5kg

Force=10N

Acceleration=force ➗ mass

Acceleration=10 ➗ 5

Acceleration=2m/s^2

4 0
3 years ago
A possum is trying to cross the street. Its velocity v as a function of time t is given in the graph below
AlladinOne [14]

Answer:

-10

Explanation:

The rectangular area is the base bbb times height hhh.

\begin{aligned}\Delta x&= A \\\\ &=(2\,\text s)\left (-5\,\dfrac{\text m}{\text s}\right ) \\\\ &= -10\,\text m\end{aligned}

Δx

​

 

=A

=(2s)(−5

s

m

​

)

=−10m

​

The possum displaces 10\,\text m10m10, start text, m, end text to the left.

4 0
3 years ago
A 420N force act on a 400N object, and the force is from the north.
belka [17]

Answer:

I believe its forward or south :D

Explanation:

7 0
2 years ago
An electroscope has a charge of −2.0 µC while your finger has a charge of 2.7 µC. You touch the electroscope with your finger an
anyanavicka [17]

Answer:

1.39 × 10⁻¹³ electrons were transferred

Explanation:

Given:

Charge on electroscope = - 2.0 μC

charge on finger = 2.7 μC

Now,

The net charge when in contact

= Charge on electroscope + charge on finger

or

The net charge when in contact = - 2.0 μC + 2.7 μC = 0.7 μC

Also,

Charge on the electroscope and the finger is same

thus,

The charge on the electroscope = \frac{\textup{Net charge}}{\textup{2}}

or

The charge on the electroscope = \frac{0.7}{\textup{2}}

or

The charge on the electroscope = 0.35 μC

Now,

The change in charge on the electroscope

= Final charge - Initial charge on the electroscope

= 0.35 μC - (- 2.0 μC)

or

The change in charge on the electroscope = 2.35 μC

also,

Charge = Number of electrons × Charge on an electron

or

2.35 μC = Number of electron  × 1.69 × 10⁻¹⁹ C

or

2.35 × 10⁻⁶ C = Number of electron  × 1.69 × 10⁻¹⁹ C

or

Number of electron = \frac{\textup{2.35\times10^{-6}}}{\textup{1.69\times10^{-19}}}

or

Number of electron = 1.39 × 10⁻¹³ electrons were transferred.

6 0
3 years ago
What was the initial speed of the car?
Mice21 [21]
I beleve it is 15 if not sorry
4 0
3 years ago
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