The answer is D No, smaller goals would be better
Line spectra are obtained when individual elements are heated using a high-voltage electrical discharge. This heating causes excitation of the element and a subsequent emission of distinct lines of colored light are obtained. Each element has its own unique emission line spectrum; therefore, if any of the tested substances were the same, their spectra would match. However, this is not the case so none of the substances are the same.
Answer:
Explanation:
Given
fly is at height of 
mouse is at a distance of 30 ft from bush
if 
is the angle of elevation then
using trigonometric relation
For this case we have the following equation:
h (t) = -16t ^ 2 + 36t + 36
By the time the rock hits the water we have:
-16t ^ 2 + 36t + 36 = 0
Solving the second degree polynomial we have:
t1 = -3/4
t2 = 3
We discard the negative root because we want to find the time.
Answer:
It will take for the rock to hit the water about:
t = 3 seconds
Answer:
This is due to refraction of light
Explanation:
When a straw is placed in a glass it appears to be broken as a result of refraction of light on the air-water interface.
Since, the refractive index of water is more than that of glass.
Also, water is denser than air, which means light travels slower in water than in air.
Most importantly, When light travels from rarer to denser medium it bents towards the normal and deviates from its original path which explains the broken view of straw in a glass of water.
