The answer is 1.5....
The refractive index n = (Speed of light, c) /( Speed of light, v)
So c= n x v
comparing to c= 1.5 x v in this situation we see that n= 1.5
Hi! i’m really really sorry but i’m answering to get pts. i tried to answer and I hope i’m right, I think A is 784. And B is 294. I’m in 5th grade btw
The correct order is dashboard> seat belt > airbag.
<h3>What is the momentum?</h3>
- The object's change in momentum is equal to the impulse it experiences. When two objects collide, an impulse occurs, which both causes and equals the change in momentum. This equation states that F • t = m • v.
- Mass in motion is described by momentum, which is the result of an object's mass and velocity. Impulse: An impulse is a force used to change the motion of an object.
- The change in momentum (P) over the change in time (t) equals force (F). And the impulse is equal to the change in momentum (P) (J). The units for momentum and impulse are kg*m/s and N*s, respectively.
- The aggregate of the momentum changes brought on by force is what is referred to as an impulse. A change in momentum is caused by force, not by impulse. Keeping track of the entire amount of force exerted to an object is all that the term "impulse" really means.
a) impulse = change in momentum
Now for all three cases, the change in momentum is the same, so the impulse is equal for all cases.
b) now average force = impulse/time
for the dashboard, time is very less as the person stops suddenly
for seat, belt time is a bit more, and for air bad, time is the greatest
so the average force is the least for airbag.
So the correct order is dashboard > seat belt > airbag.
To learn more about momentum, refer to:
brainly.com/question/402617
#SPJ4
To develop this problem we will apply the concepts related to the conservation of momentum. For this purpose, the initial momentum will be equivalent to the initial momentum of the two objects when they have the same speed. Mathematically this can be expressed as,
Where,
= Mass of bullet
= Velocity of bullet
= Mass of wooden block
Velocity of Wooden block
Inititally 
then we have that the expression can be rearrange to find the velocity of the bullet,
Replacing with our values
Therefore the velocity of the bullet before striking the block is 319.6m/s
Answer:
11.56521 m/s
Explanation:
= Area of first section = 
= Area of second section = 
= Velocity in first section = 1.9 m/s
= Velocity in second section
From the continuity equation we get
The speed of the river through the section of rapids is 11.56521 m/s
