Radiocarbon saying assume the half life for radioistopes change over time. The half life of C -14 is 5730 years
The main reason why wheelchair ramps are used to move people up a staircase is because it has a high mechanical advantage which leads to a greater efficiency in moving people up the staircase.
- <em>Let the height of the staircase = h</em>
- <em>Let the length of the ramp = L</em>
The mechanical advantage of the ramp is calculated as follows;

As the length of the ramp increases, people will be move up to a greater distance up the staircase.
Thus, the main reason why wheelchair ramps are used to move people up a staircase is because it has a high mechanical advantage which leads to a greater efficiency in moving people up the staircase.
Learn more about mechanical advantages of ramps here: brainly.com/question/200179
Answer:
C
Explanation:
The answer is C cause ... look at the file I added! Plz mark as brainlest! PASS THE TEST OR ASSIGNMNETT!
Explanation:
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