How far will a free falling object fall in 8.7 secs if it started from rest? Remember acceleration is negative for free fall. Do
1 answer:
Answer:
h~=371.26m
Explanation:
when an object falls we use the equations of accelerated motion. There is only one that gives distance.
Since we have no initial velocity (started from rest) we can get rid of the (ut) term
where a we substitute g (gravitational acceleration, constant for given heights and almost 9.81m/s^2).
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Answer:
The missing species is carbon-12 .
The nuclear equation should be .
Explanation:
Let represent the mass number of the missing species, and let
represent its atomic number.
.
For this question, there are three things to consider:
- The sum of the mass numbers should be conserved.
- Since there's no beta particle (
or
) involved, the sum of the atomic numbers should also be conserved.
- The atomic number of the missing species should correspond to atomic symbol.
The sum of the mass numbers on the left-hand side of this reaction is: .
The sum of the mass number on the right-hand side (including that of the missing species) is .
These two numbers should be the same. In other words, . Therefore, the mass number of the missing species would be
.
The sum of the atomic numbers on the left-hand side of this reaction is: .
The sum of the mass number on the right-hand side (including that of the missing species) is .
These two numbers should be the same. In other words, . Therefore, the mass number of the missing species would be
.
The atomic number of the missing species is
. Look up a modern periodic table. The element with atomic number