A wheel and axel because the axel is a rod in the door and the knob is the wheel portion. However, these things can also be considered a lever.
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More commonly used
Answer:
SI unit of k (spring constant) = N/m
Explanation:
We have expression for force in a spring extended by x m given by
F = kx
Where k is the spring constant value.
Taking units on both sides
Unit of F = Unit of k x Unit of x
N = Unit of k x m
Unit of k = N/m
SI unit of k (spring constant) = N/m
The sciatic nerve is a part of the Sacral Plexus