Answer:
The critical angle is
Explanation:
From the question we are told that
The index of refraction of the glass in the fiber is
The index of refraction of the glass in the cladding is
The critical angle is mathematically evaluated as
substituting values
Answer: 15 mph east
Explanation: Since the bicycle went east for 30 miles, in 2 hours. You divide 30 by how many hours which is 2. So, the solution is 15.
This is an example of free fall;
For free fall the gravitational acceleration is -9.8 m/s²
From the equation;
S = ut -1/2gt², where S is the height above the ground, U is the initial vertical velocity, t is the time taken.
Therefore;
1.2 = 20t - 1/2(9.8)t²
1.2 = 20t -4.9t²
Thus; the equation is -4.9t² + 20t = 1.2, this is the appropriate answer.