Answer:
Y
Explanation:
by adding all the numbers
Answer:
C ) 1.53
Explanation:
The critical angle of a material is given by the formula

where
c is the critical angle
n is the refractive index
This formula is valid if the second medium is air (which is the case of the problem).
In this problem, we know the critical angle:

Therefore we can rearrange the equation to find the refractive index:

This is false. I hope this helps.
Explanation:
speed : • how fast an object changes position
• miles per hour.
• distance/time.
velocity: • speed in a direction
• miles per hour North
• distance/ time in a direction
The center of mass is given with this formula:

Velocity is:

So, for the velocity of the center of mass we have:

In our case it is: