2. An element is a mixture of two isotopes. One isotope has an atomic mass of 34.969 amu and an
2 answers:
Answer: The average atomic mass of an element is 35.67 amu and the unknown element will be chlorine.
Explanation:
Mass of isotope 1 = 34.969 amu
% abundance of isotope 1 = 64.88% =
Mass of isotope 2 = 36.966 amu
% abundance of isotope 2 = (100-64.88)% =
Formula used for average atomic mass of an element :
Therefore, the average atomic mass of an element is 35.67 amu and the unknown element will be chlorine.
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Answer:
1. 3
2. 1.5
3. 3 seconds
4. 0
5. 2.2 seconds
Explanation:
(1)
From v= u + at where v is final velocity, u is initial velocity, a is acceleration and t is time.
Making a the subject we have
Substituting u=0 since it’s at rest, v=30m/s and t=10 seconds
a =
(2)
From v= u + at where v is final velocity, u is initial velocity, a is acceleration and t is time.
Making a the subject we have
Substituting u=10m/s, v=22m/s and t=8 seconds
a =
(3)
From v= u + at where v is final velocity, u is initial velocity, a is acceleration and t is time.
Making t the subject we have
Substituting u=0m/s since at rest, v=15m/s and a=5
=
(4)
When initial and final velocity are constant, there’s no acceleration as proven below
From v= u + at where v is final velocity, u is initial velocity, a is acceleration and t is time.
Making a the subject we have
Substituting u=20 since it’s at rest, v=20m/s and t=10 seconds
a =
(5)
From v= u + at where v is final velocity, u is initial velocity, a is acceleration and t is time.
Making t the subject we have
Substituting u=9m/s since at rest, v=0m/s and a=-4.1
=