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3 years ago

Calculate the index of refraction for a medium in which the speed of light is 2.290 x 10^8 m/s?

Physics

1 answer:

yaroslaw [1]3 years ago

6 0

Answer:

The idex of refraction of the medium is 1.31.

Explanation:

the relationship between the index of refraction of a medium and the speed at which light travels is given by:

n = c/v

where n is the index of refraction, c is the speed of light and v is the speed of light in the medium.

n = c/v

= (3×10^8)/(2.290×10^8)

= 1.31

Therefore, the idex of refraction of the medium is 1.31.

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Does an athlete do work on a trophy as she lifts it overhead

bogdanovich [222]

No she/he is doing work for her muscles

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3 years ago

The hour and minute hands of a tower clock like Big Ben in London are 2.79 m and 4.44 m long and have masses of 58.2 kg and 90 k

LuckyWell [14K]

Answer: 895.85 x 10^-6 J or 8.96 x 10^-4 J

Explanation:

Angular kinetic energy E in Joules

E = ½Iw^2

W is angular velocity in radians/sec

1 radian/sec = 9.55 rev/min

I is moment of inertia in kgm^2

I = cMR^2

M is mass (kg), R is radius (meters)

c = 1/3 for a rod around its end, R = length

For minute hand

I = (1/3)(90)(4.44)^2 = 0.33 x 90 x 19.7136 = 585.49

w= 1 rev/hour = 1 rev/3600sec = 2pi/ 3600 = pi/1800 rad/s

KE = 1/2(1/3)(90)(4.44)^2(pi/1800)^2 = 0.5 x 0.33 x 90 x 19.7136 x 3.05 x 10^-6

KE = 0.00089 J

For hour hand

I = (1/3)(58.2)(2.79)^2 = 0.33 x 58.2 x 2.79^2 = 149.5

w = 1 rev/12hour = 1 rev/(12x3600sec) = 2pi/ 12x3600 = pi/21600 rad/s

KE = 1/2(1/3)(90)(4.44)^2(pi/21600)^2 = 0.5 x 0.33 x 90 x 19.7136 x 2.12 x 10^-8

KE = 5.85 x 10^-6 J

Therefore total kinetic energy = 895.85 x 10^-6 J

4 0

4 years ago

The hypotenuse of a right triangle is 29.0 centimeters. The length of one of its legs is 20.0 centimeters. What is the length of

SVEN [57.7K]

C2 = a2 + b2
29^2 = a^2 + 20^2
841 = a^2 + 400
441 = a^2
a = 21

3 0

3 years ago

Read 2 more answers

A physics student spins a bucket of water over her head in a circular path in order to demonstrate centripetal force. She fills

Ronch [10]

Answer:

The first case requires more force to spin de bucket.

Explanation:

As we know, the centripetal force is directly proportional to the mass, the equation is given by:

$F_{c}=ma_{c}$

The first case has a quarter more water than the second case, therefore the first case requires more force to spin de bucket.

I hope it helps you!

3 0

3 years ago

An object experiences an acceleration of -6.8m/s^2. As a result, it accelerates from 54m/s to a complete stop. how much distance

Kipish [7]

Answer:

210 m

Explanation:

Given:

a = -6.8 m/s²

v₀ = 54 m/s

v = 0 m/s

Find: Δx

v² = v₀² + 2aΔx

(0 m/s)² = (54 m/s)² + 2 (-6.8 m/s²) Δx

Δx ≈ 210 m

6 0

3 years ago