Question 18 of 25

Light is incident from air on the surface of a glass slab, which has an index of refraction of 2.5 In the air the light beam mak

djverab [1.8K]

Answer:

13.26°

Explanation:

Using Snell's law as:

$n_i\times {sin\theta_i}={n_r}\times{sin\theta_r}$

Where,

${\theta_i}$ is the angle of incidence ( 35.0° )

${\theta_r}$ is the angle of refraction ( ? )

${n_r}$ is the refractive index of the refraction medium (glass, n=2.5)

${n_i}$ is the refractive index of the incidence medium (air, n=1)

Hence,

$1\times {sin35.0^0}={2.5}\times{sin\theta_r}$

Angle of refraction= sin⁻¹ 0.2294 = 13.26°.

13.26° is the angle of the beam with the normal in the glass.

3 0

4 years ago

Suppose a child drives a bumper car head on into the side rail, which exerts a force of 3900 N on the car for 0.55 s. Use the in

-Dominant- [34]

Answer:

The impulse is 2145 kg-m/s

The final velocity is -8.34 m/s or 8.34 m/s in he opposite direction.

Explanation:

Force on the rail = 3900 N

Elapsed time of impact = 0.55 s

Impulse is the product of force and the time elapsed on impact

I = Ft

I is the impulse

F is force

t is time

For this case,

Impulse = 3900 x 0.55 = 2145 kg-m/s

If the initial velocity was 2.95 m/s

and mass of car plus driver is 190 kg

neglecting friction, the initial momentum of the car is given as

P = mv1

where P is the momentum

m is the mass of the car and driver

v1 is the initial velocity of the car

initial momentum of the car P = 2.95 x 190 = 560.5 kg-m/s

We know that impulse is equal to the change of momentum, and

change of momentum is initial momentum minus final momentum.

The final momentum = mv2

where v2 is the final momentum of the car.

The problem translates into the equation below

I = mv1 - mv2

imputing values, we have

2145 = 560.5 - 190v2

solving, we have

2145 - 560.5 = -190v2

1584.5 = -190v2

v2 = -1584.5/190 = -8.34 m/s

6 0

4 years ago

What must a magnet always have?

Rainbow [258]

Answer:

two opposite poles

Explanation:

3 0

3 years ago

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Sam and Reagan are arguing about waves. Sam says that sound waves are transverse, but Reagan says they Are longitude. Who is rig

sergij07 [2.7K]

The correct answer is Reagan is right because sound waves are compressional waves.

Reason is because Sound is transmitted through gases, plasma, and liquids as longitudinal waves, also called compression waves. It requires a medium to propagate. Through solids, however, it can be transmitted as both longitudinal waves and transverse waves.

3 0

4 years ago

Describe how a unique position of the sun , earth, and moon creates a lunar eclipse

Serggg [28]

A eclipse of the sun can only occur at a new moon when the moon passes between earth and sun. If the moons shadow happens to fall upon earths surface at a time, you'll see some portion of the suns disk covered or aka eclipsed by the moon.. I hope that helps

8 0

3 years ago

Read 2 more answers