A girl walks East at 2.7 m/s. What is the y component of her velocity?

The y component of her velocity is zero

Explanation:

Given that North and South represent the positive and negative y component of the velocity vector.

And East and West represent the positive and negative x component of the velocity vector.

For a girl walking east at 2.7 m/s

The x component of velocity is;

vx = 2.7 m/s (east is positive x axis)

The y component of velocity is;

vy = 0 m/s (no movement in the northern and southern direction)

Therefore, The y component of her velocity is zero (0m/s)

half of a circle

explanation:

the arrow and the top of the circle is matching together. it is not a polygon because a polygon would always be the same shape. therefore, an half of a circle is called semicircle so you would find the radius of it.

adding a(n) to an electric circuit would increase the magnetic field around a wire;

b. solenoid

a solenoid is a type of electromagnet whose purpose is to generate a controlled magnetic field.

if the purpose of the solenoid is instead to impede changes in the electric current, a solenoid can be more specifically classified as an inductor rather than an electromagnet.