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3 years ago

What does a refractive index from medium 1 to medium 2 mean? Isn't one of the medium must be vacuum?

Physics

1 answer:

Musya8 [376]3 years ago

6 0

Refractive index is the measure of bending of a ray of light when passing from one medium into another. It is not necessary that one medium must be vaccum.

For example, the image below shows refraction, where first medium is air and second medium is water.

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If each of the three rotor helicopter blades is 3.50 m long and has a mass of 120 kg , calculate the moment of inertia of the th

devlian [24]

Answer:

1470kgm²

Explanation:

The formula for expressing the moment of inertial is expressed as;

I = 1/3mr²

m is the mass of the body

r is the radius

Since there are three rotor blades, the moment of inertia will be;

I = 3(1/3mr²)

I = mr²

Given

m = 120kg

r = 3.50m

Required

Moment of inertia

Substitute the given values and get I

I = 120(3.50)²

I = 120(12.25)

I = 1470kgm²

Hence the moment of inertial of the three rotor blades about the axis of rotation is 1470kgm²

7 0

3 years ago

A Boeing 747 "Jumbo Jet" has a length of 59.7 m. The runway on which the plane lands intersects another runway. The width of the

tia_tia [17]

Answer:

t = 1.48 s

Explanation:

As we know that length of the Boeing plane is

$L = 59.7 m$

width of the intersection is given as

$w = 25.0 m$

now we know that deceleration of the plane is given as

$a = -5.4 m/s^2$

Also the final speed of the plane while it clears the intersection is given as

$v_f = 53 m/s$

now we have

$d = (\frac{v_f + v_i}{2}) t$

$(25 + 59.7) = (\frac{53 + v_i}{2}) t$

also we know that

$v_f - v_i = at$

$53 - v_i = -5.4 t$

now we have

$84.7 = (\frac{53 + 53 + 5.4t}{2})t$

by solving above equation we have

$t = 1.48 s$

5 0

3 years ago

Calcular el volumen de un cubo 36 cm

3241004551 [841]

Answer:

vol = 46,566 cm³

Explanation:

calcular el volumen de un cubo 36 cm

find: volume

let side of a cube = 36 cm

vol = side ³

vol = 36 ³

vol = 46,566 cm³

8 0

3 years ago

A toy car (0.50 kg) runs on a frictionless track and has an initial kinetic energy of 2.2 J, as the drawing shows. The numbers b

steposvetlana [31]

Answer:

Height will be equal to 0.4489 m

Explanation:

We have given mass of the toy m = 0.50 kg

Initial kinetic energy K = 2.2 J

We have to fond the height of the hill over which car roast

When car will roast the hill its kinetic energy will be converted into potential energy and at maximum height all kinetic energy will be converted into potential energy

So at maximum height $mgh=K$

Acceleration due to gravity $g=9.8m/sec^2$

So 0.50×9.8×h = 2.2

h = 0.4489 m

6 0

3 years ago

A book is sitting on a table at rest. Which of the following best describes the forces acting on the book

ser-zykov [4K]

Gravity is pulling the book towards the center of the earth, and the rebounding effect of the table cancelling out gravity allowing for the book to sit at rest.

3 0

3 years ago

Read 2 more answers