An atomic mass unit is equal to
2 answers:
Answer: c. one-twelfth the mass of a carbon-12 atom.
Explanation: An atomic mass unit ( amu) is defined as of the mass of an atom of carbon with mass number 12 , which is the most abundant isotope of carbon. Thus the carbon-12 atom has six protons and six neutrons in its nucleus.
1 amu is approximately equal to or
. The mass of an atom in amu is roughly equal to the sum of the number of protons and neutrons in the nucleus.
amu is used to differentiate between isotopes as they would have different mass.
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Given :
Vector A has a magnitude of 63 units and points west, while vector B has the same magnitude and points due south.
To Find :
The magnitude and direction of
a) A + B .
b) A - B.
Solution :
Let , direction in north is given by +j and east is given by +i .
So , and
Now , A + B is given by :
Direction of A+B is 45° north of west .
Also , for A-B :
Direction of A-B is 45° south of west .
( When two vector of same magnitude which are perpendicular to each other are added or subtracted the resultant is always 45° from each of them)
Hence , this is the required solution .