the answer is rust so the answer is rust
'Pressure' is (force) / (area).
The only choice with those units is #1 .
To calculate for the force in a spring, we use Hooke's Law which relates force and the displacement of the spring. It is said that the force is directly proportional to the displacement. So, it will have the equation F = kx where k is a constant and it is the spring constant.
F = kx
F = 45 N/m (0.03)
F = 1.35 N
Answer:
Normal force, 
Explanation:
Let 
is the weight of suitcase. A man attempts to pick up his suitcase by pulling straight up on the handle. The weight of the suitcase in downward direction. The normal force is acting in upward direction. Let F is the force with which it is pulled straight up.
So, the normal force is given by :
N = mg - F
mg is the weight of the suitcase.
Hence, this is the required solution.
