Answer: Her velocity magnitude (v) relative to the shore is 5.70 km/h.
Explanation:
Let Q be the speed of the boat, and P be the speed of the river flow.
R represents the resultant velocity combining boat velocity and river current.
According to vector addition using the law of triangles:

From the diagram:
P = 3.5 km/h, Q = 4.5 km/h




Therefore, her velocity magnitude relative to the shore is 5.70 km/h.
Answer:
The overall length of the spiral, designated as L, is calculated to be 5378.01 m
Explanation:
Provided information:
Inner radius R1=2.5 cm
and outer radius R2= 5.8 cm.
The thickness of the spiral winding is (d) =1.6 \mu m = 1.6x 10^{-6} m
The total length of the spiral can be computed as



= 5378.01 m