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2 years ago

Define refractive index.

2 answers:

8 0

The refractive index of a material is a dimensionless number that describes how fast light travels through the material. It is defined as n={\frac {c}{v}}, where c is the speed of light in vacuum and v is the phase velocity of light in the medium.

the ratio of the velocity of light in a vacuum to its velocity in a specified medium.

irga5000 [103]2 years ago

5 0

Answer:

In optics, the refractive index of a material is a dimensionless number that describes how fast light travels through the material. It is defined as n={\frac {c}{v}}, where c is the speed of light in vacuum and v is the phase velocity of light in the medium.

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Calculate the acceleration due to gravity at a point 1000km above the surface of the earth?

klio [65]

Answer:

g' = 6.74 m/s²

Explanation:

R = 6400km

h = 1000km

g = 9.81m/s

g' = g(1 - 2h/R)

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4 years ago

The term “distance” refers to ?

Mnenie [13.5K]

Answer:

numerical measurement of how far apart objects or points are.

Explanation:

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4 years ago

A woman drives a car from one city to another with different constant speeds along the trip. She drives at a speed of 80.0 km/h

romanna [79]

Answer:

Total distance traveled= 75.36km (point at which she reaches her destination.)

Explanation:

With the speed and time data we can calculate the distance traveled on each path, but first we must transform the time units from minutes to hours:

First ride:

v=80km/h t=25min*1h/60min=0.42h

distancie= v*t = 80km/h * 0.42h =33.6km

Second ride:

v=65.0km/h t= 20min*1h/60min= 0.33h

distance= 65.0km/h*0.33h=21.67km

Stop: 60min= 1h distance=0km

third ride:

v= 40.0km/h t= 30.0min *1h/60min= 0.5h

distance= 40.0km/h*0.5h=20km

Total distance traveled= 33.6km +21.76km+20km

Total distance traveled= 75.36km

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3 years ago

There were many different microorganisms on the pillows. Dr. Tierno stated that these germs were probably causing the kids to ha

malfutka [58]

Answer:

What kinds of microorganisms were found on the pillow and what kinds of allergy symptoms were caused by these microorganisms?

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3 years ago

Read 2 more answers

A rock is thrown upward from level ground in such a way that the maximumheight of its flight is equal to its horizontal rangeR.

Snowcat [4.5K]

A) The vertical component of velocity v is taking the rock to a height

Vertical component = $vsin\theta$
The time taken to reach maximum height = $\frac{vsin\theta}{g}$
So total time of rocks flight = $\frac{2vsin\theta}{g}$
Range of rock is due to the horizontal component of velocity = $vcos\theta$
Range = $\frac{2*v*sin\theta*v*cos\theta}{g}$ = $\frac{2*v^2*sin\theta*cos\theta}{g}$
Maximum height = $\frac{g*t^2}{2}$ = $\frac{v^2*sin^2\theta}{2*g}$
Since range = maximum height
We have $\frac{2*v^2sin\theta*cos\theta}{g} = \frac{v^2*sin^2\theta}{2*g}$
$tan\theta = 4$
$\theta = 75.96^0$
So when angle of projection is $\theta = 75.96^0$ range is equal to maximum height reached.
b) We have range = $\frac{2*v^2*sin\theta*cos\theta}{g}$ = $\frac{2*v^2*sin2\theta}{g}$
Maximum of range is reached when $\theta = 45^0$
Maximum range = $\frac{2*v^2}{g}$
c) For range to be equal to maximum height only condition is $tan\theta = 4$ , it does not depend upon acceleration due to gravity and velocity. That angle is a constant.

5 0

3 years ago

Define refractive index.​

Define refractive index.