99pts. I can't find isotope, pottasium-15 or k-15. Is this even possible, I have a fill-in-the-blanks worksheet with a table like example:Element Name: Nitrogen-20 Symbol: N-20 Atomic Number: 7 Atomic Mass: 20 Charge: 0 Protons: 7 Neutrons: 13 Electrons: 7
I remember finding the isotope number, Nitrogen-20 by adding the Protons and Neutrons, then I get a new atomic mass. But on here Pottasium-15 is confusing! What neutrons do I add from 19 protons to get 15? Sometimes the teacher throws in impossible problems.
Answers
Yes, that's what [s]he has done this time.
First of all, the number of protons in every atom of an element
is the same. That's the "Atomic number" of the element. If
somehow the nucleus of the atom gained or lost a proton, then
that would change the Atomic number of the atom, and it would
be an atom of a different element.
Potassium is element #19. Every atom of Potassium has 19 protons
in its nucleus. Any atom that has 19 protons in its nucleus is an atom
of Potassium, and any atom that has more or less than 19 protons in
its nucleus is an atom of some other element, not Potassium.
In addition to protons, atoms also have some neutrons in the
nucleus. Neutrons have no charge, so they don't change the
atomic number of the atom. But they have mass ... almost the
same as the mass of a proton ... so the neutrons add to the atom's
"atomic weight". The atomic weight of an atom is
(number of protons) plus (number of neutrons).
The numbers you see next to the names are the atomic weights.
Notice that the atomic weight of an atom of Potassium can't be
less than 19 ... in order for it to be Potassium in the first place,
it has 19 protons, so its atomic weight would be 19 even if it had
no neutrons at all.
There can be no such thing as an atom of Potassium-15.
Atoms of the same element can have different numbers of
neutrons in their nucleii. Those are called "isotopes" of the
element.
There are three isotopes of Potassium that occur in nature ...
atoms with 19 protons plus 20, 21, or 22 neutrons. So the
atomic weight of any naturally occurring atom of Potassium
is either 39, 40, or 41. If you ever see a big chart that lists
natural isotopes of the elements, then in slot-#19, you'll see
Potassium-39, Potassium-40, and Potassium-41.
I hope my explanation is good enough for 50 points.
super super late ans but im up late n looking 4 interesting Qs...
Potassium-15 is confusing indeed! What neutrons can one add to a nucleus with 19 protons to get a mass of 15? anti-matter cannot do it as scientists have generally agreed that anti-matter has the same mass as regular matter but with an opposite spin.
the ans actually doesnt exist when the Q was originally asked but in 2017, Washington State University physicists created a fluid with negative mass. so theoretically a "negative neutron" will have a mass of -1. combining 4 of such exotic particles to 19 protons will create K-15; assuming there is no explosion from the combination.
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Answer: It takes 365 days for earth to complete one revolution.
Explanation: Earth takes 365 days to complete one revolution around the sun.
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Answers
When the separation between two masses is doubled, the gravitational force between them decreases by 4.
What is meant by gravitational force ?
Gravitational force is defined as the force of attraction experienced by a body due to the gravity of earth.
Here,
The separation between two masses is doubled.
That means the distance, r₂ = 2r₁
We know that the equation of gravitational force is given by,
F = GMm/r²
where G is the gravitational constant
From the equation, we know that the gravitational force obeys the inverse square law.
That means the gravitational force is inversely proportional to the square of the distance between the masses.
So, F 1/r²
Therefore,
F₂/F₁ = (r₁/r₂)²
F₂ = F₁(1/2)²
F₂ = F₁/4
Hence,
When the separation between two masses is doubled, the gravitational force between them decreases by 4.
To learn more about gravitational force, click:
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Answer:
increase by a factor of 4.
Explanation:
If the separation distance between two objects is doubled (increased by a factor of 2), then the force of gravitational attraction is decreased by a factor of 4 (2 raised to the second power).
Answers
So good luck.
I hope this helps you.
equal in magnitude and equal in direction
B.
equal in magnitude and opposite in direction
C.
opposite in magnitude and equal in direction
D.
opposite in magnitude and opposite in direction
Answers
the answer of the question is A
B.This is true because weight is the amount of matter in an object. Because gravity is a force, and force is proportional to weight, both gravity and weight vary in different places in the universe.
C. This is true because gravitational force is the magnitude of weight acting on an object and since weight varies in different places in the universe, gravitational force also varies.
D. This is true because weight is the magnitude of gravitational force acting on an object, and since gravitational force varies in different places in the universe, weight also varies.
Answers
Explanation :
We know that the weight of an object is given by :
Where,
m is the mass
g is the acceleration due to gravity.
The value of g changes from one location to another.
An object's weight is dependent upon its location in the universe. This statement is true. This is because g varies in different places so the weight also varies.
Hence, the correct option is (D) " This is true because weight is the magnitude of gravitational force acting on an object, and since gravitational force varies in different places in the universe, weight also varies ".
Because an object's weight is the measure of the gravitational
forces between the object and other things that have mass.
In its travels around the universe, the object can be in the
neighborhood of other things with huge mass or tiny mass,
and it can be nearer to them or farther away from them. So
the gravitational forces between the object and other things
can have widely different values in different places.
Read the choices very carefully.
I think 'D' is the one that says this.