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3 years ago

1. Order the materials from smallest refractive index to largest refractive index.

Physics

1 answer:

slavikrds [6]3 years ago

3 0

Air = 1

Water = 1.33

Glass = 1.52

Quartz = 1.46

Diamond = 2.42

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A horizontal disk with a radius of 23 m rotates about a vertical axis through its center. The disk starts from rest and has a co

lys-0071 [83]

Answer:

time is 0.42 sec

Explanation:

Given data

radius = 23 m

angular acceleration = 5.7 rad/s²

to find out

time

solution

we know that radius is constant so that

tangential acceleration At = angular acceleration × radius ............. 1

tangential acceleration = 5.7 × 23 = 131.1 m/s²

and

radial acceleration Ar = (angular velocity)² × radius ........................2

we consider angular velocity = ω

this is acting toward center

compare 1 and 2

At = Ar

5.7 r =ω³ r

ω = √5.7 = 2.38746 rad/s

ω = 5.7 t

2.387 = 5.7 t

t = 2.387 / 5.7

t = 0.4187

time is 0.42 sec

8 0

3 years ago

A seed can be round when parents are crossed, scientists refer to the first generation of offspring as

lora16 [44]

Hey there!

A seed can be round when parents are crossed, scientists refer to the first generation of offspring as F1. <span> This is the first generation of seeds from very different parental types.</span><span>

</span>Thank you!

4 0

4 years ago

Why is the moons surface much more heavily cratered than earths surface

wlad13 [49]

The earth has less creators because there is a protective atmosphere which makes the asteroids burn up before they hit the surface of earth. Which means by the moon not having an atmosphere small rocks are easily colliding with the moons surface.

4 0

3 years ago

Calculate the resulting speed of an airplane with an airspeed of 120 km/h pointing due north when it encounters a wind of 90 km/

STatiana [176]

Answer:

The resulting speed of the airplane is 150 Km/h

Explanation:

The airspeed of the plane is 120 Km/h due North. The wind came from West pointing to the East at 90 Km/h

Both speeds are acting in different directions, so they must be added as vectors. Both vectors and the resulting velocity (Vr) are shown in the image below

The magnitude of that velocity can be computed by using Pythagoras's theorem:

$Vr^2=120^2+90^2$