Answer:
(a) 
(b) 1.71
Explanation:
(a) The difference in the times of travel in the two case = 
This difference is the time in the transparent material. With a thickness of 35.0 cm, the speed in the material is

(b) The refractive index of the material is the ratio of the velocity of light in vacuum to its velocity in the material. Using speed of light in vacuum as
, the refractive index,
, is

Answer:
The magnitude of the horizontal displacement of the rock is 7.39 m/s.
Explanation:
Given that,
Initial speed = 11.5 m/s
Angle = 50.0
Height = 30.0 m
We need to calculate the horizontal displacement of the rock
Using formula of horizontal component

Put the value into the formula


Hence, The magnitude of the horizontal displacement of the rock is 7.39 m/s.
The net force acting on the two (2) kids is equal to 180 Newton.
<u>Given the following data:</u>
- Mass of kid 1 = 40 kilogram.
- Mass of kid 2 = 50 kilogram.
- Acceleration = 2

To determine the net force acting on the two (2) kids:
First of all, we would calculate the total mass of the two (2) kids:

Total mass = 90 kg.
<h3>
How to calculate net force.</h3>
In this exercise, you're required to calculate the magnitude of the net force that is acting on these two (2) kids running down the hall. Thus, we would apply Newton's Second Law of Motion.
Mathematically, Newton's Second Law of Motion is given by this formula;

Substituting the given parameters into the formula, we have;

Net force = 180 Newton.
Read more on acceleration here: brainly.com/question/1121817
I THINK it is C. KEYWORD is THINK
Answer:
Mandaloun won the race.
Explanation:
First, we will calculate the time taken by the Hot Rod Charlie:

where,
t = time taken by Hot Rod Charlie = ?
s = distance covered = 1.25 miles
v = speed of Hot Rod Charlie = 0.79 miles/min
Therefore,

Since Hot Rod Charlie took more time (1.58 min) than the Mandaloun (1.52 min).
<u>Therefore Mandaloun won the race.</u>