Answer:
(a)
(b) 
Explanation:
Let us take the north direction to be the positive y-axis and the east to be positive x-axis.
First day:
25.0 km southeast, which implies 
south of east. The y-component will be negative and the x-component will be positive.
Second day:
She starts off at the stopping point of last day. This time, both the y- and x-components are positive.
Therefore, total displacements:
Magnitude of displacements,
Direction,
What are the options so that I can help.
Answer:
atmosphere
Explanation:
majority of nitrogen found in atmosphere,it's about 78% and present in form of gas
Answer: UVA rays occupy the frequency range between 7.1 . 10¹⁴ and 9.4. 10¹⁴ Hz.
Explanation:
UV rays are simply electromagnetic waves, which wavelength is just below the visible spectrum (hance the name ultraviolet, meaning beyond violet).
As any elecromagnetic wave, propagates in the free space at the same speed that light does, i.e. 3.10⁸ m/s.
Also, we know that there exists a direct relationship between the wave speed, her wavelength (distance travelled by the wave during one cycle time) and the frequency (the inverse of the time needed to complete one cycle).
This relationship can be written as the following equation:
v = λ . f ⇒ f = v/λ
Replacing by the extreme wavelengths, we find the corrresponding limit frequencies as follows:
f₁ = 3.10⁸ m/s / 320 . 10⁻⁹ m ⇒ f₁ = 9.4 . 10¹⁴ Hz.
f₂ = 3.10⁸ m/s / 400 . 10⁻⁹ m ⇒ f₂ = 7.1 . 10¹⁴ Hz.
What are the statements? both of the objects do move attract and maybe that is the answer
