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3 years ago

11

How many neutrons does potassium have?

2 answers:

Sloan [31]3 years ago

6 0

Answer:

the answer is 20 neutrons

Explanation:

oksano4ka [1.4K]3 years ago

3 0

Answer:

20 neutrons

The nucleus of an atom of potassium contains 19 protons and 20 neutrons.

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The charge within a small volume dv is dq=ρdv. the integral of ρdv over a cylinder of length l is the total charge q=λl within t

azamat

The volume of the shell that you described would be:
$dV=2L\pi r dr$
Now we can rewrite the given integral:
$\lambda L=\int\rho dV=L\rho\int2\pi r dr \\ \lambda L =L\rho \pi r^2\\ \rho=\frac{\lambda}{\pi r^2}$
I have attached the picture explaining how we got the formula for the volume.
On the picture, I marked the rectangle. You can of this rectangle as the base, and the height would be the circumference of the cylinder.

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3 years ago

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The tub of a washing machine goes into its spin cycle, starting from rest and gaining angular speed steadily for 10.0 s, at whic

ioda

Answer:

69 revolutions

Explanation:

given,

initial angular velocity = 0

final angular velocity = 6 rev/s

when safety switch turned off

tub smoothly slows to rest in (t)= 13 s

total revolution of tub = ?

angular acceleration = $\dfrac{\omega_f-\omega_0}{t}$

angular acceleration = $\dfrac{6-0}{10}$

= 0.6 rev/s²

now,

$\theta = \omega_i t +\dfrac{1}{2}\alpha t^2$

$\theta = 0+\dfrac{1}{2}\times 0.6 \times 10^2$

= 30 revolution

now,

when safety switch turn off

angular acceleration = $\dfrac{\omega_f-\omega_0}{t}$

angular acceleration = $\dfrac{0-6}{13}$

= -0.462 rev/s²

now,

$\theta = \omega_i t +\dfrac{1}{2}\alpha t^2$

$\theta = 6 \times 13 -\dfrac{1}{2}\times 0.462 \times 13^2$

= 39 revolution

total revolution = 30 + 39 = 69 revolutions.

tub will rotate 69 revolutions

4 0

3 years ago

Mention two advantage of writing very big and small numbers in tge power of ten.<br>

Elenna [48]

Easier to write, easier to read, easier to understand, easier to compare

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3 years ago

Can you predict the speed of a car as it moves down the track?

Elan Coil [88]

Answer I will say no

Explanation:

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3 years ago

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Complete the sentence with the word "element" or "compound." O is a(n) and H202 is a(n)

Sauron [17]

Answer:

O is an element and H2O2 is a compound.

Explanation:

O is a single element while H2O2 has 2 elements, which makes it a compound.

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3 years ago