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4 years ago

Which statement is most accurate

Physics

2 answers:

Aloiza [94]4 years ago

6 0

Answer:

Statement 2: The more optically dense the material, the higher the refractive index

Explanation:

The optical density of the material is different than the physical density of the material. Physical density is mass per unit volume. Whereas optical density of a material is the tendency of its atoms to absorb the energy of incident photons, maintain that in the form of vibrating electrons and then re emitting it as a new Electro-magnetic disturbance.

Higher the optical density, lesser will be speed of light in the medium and refractive index will be higher as it is related to speed of light in the medium as

$n_{medium} = \frac{3\times 10^{8}}{v_{medium}}$

Where,

n = refractive index of the medium

v = speed of light in the medium in m/s

-BARSIC- [3]4 years ago

3 0

Answer:

B. The more optically dense the material, the higher the refractive index.

Explanation:

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A rope is wrapped around a pulley many times. The pulley can be modeled as a solid disk of radius R and mass M, and a mass mA ha

aleksandr82 [10.1K]

The magnitude of the tangential acceleration of the hanging mass is 2mg/MR

<h3>Tangential acceleration of the hanging mass</h3>

The tangential acceleration of the hanging mass around the pulley is determined from the principle of conservation of angular momentum as shown below;

τ = Iα

Where;

I is the moment of inertia
α is the angular velocity

$\alpha = \frac{\tau}{I} \\\\\alpha = \frac{mgR}{3/2MR^2} \\\\\alpha = \frac{2mgR}{3MR^2} \\\\\alpha = \frac{2mg}{3MR}$

Where;

m is the hanging mass
M is the mass of solid disk

The tangential acceleration is calculated as follows;

$a = \alpha R\\\\a = \frac{2mg}{3MR} \times R\\\\a = \frac{2mg}{3M}$

Thus, the magnitude of the tangential acceleration of the hanging mass is 2mg/MR

Learn more about tangential acceleration here: brainly.com/question/11476496

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3 years ago

A ball of 0.5kg slows down from 5m/s to 3m/s. Calculate the work done in the process

ivann1987 [24]

Answer: Cannot determine cause we need to know the change of time to calculate the work.

Explanation:

m = 0.5kg

V = 3m/s - 5m/s = -2m/s

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F = ma

W = Fvt

W = (0.5)(9.8)t = 4.9t

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2 years ago

How do astronauts overcome this obstacle when communicating in space?

DochEvi [55]

Answer:

By having specialized instruments onboard NASA spacecrat, they do this to detect how they behave

Explanation:

I really hope this is right have a stellar day.

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3 years ago

The change of an atom from an excited state to the ground state always requires

Vilka [71]

Answer:

c. emission of electromagnetic radiation.

Explanation:

When an atom changes its state from an excited one to the ground state, it means that the atom is changing from a state with higher energy to a state of lower energy.

This can occur, for instance, in the presence of an electronic transition (an electron moving from a higher energy level to a lower energy state) or of a nuclear transition (the nucleus get de-excited). In both cases, since the total energy must be conserved, there must be energy released. This energy is released as a photon (electromagnetic radiation), whose energy is equal to the difference between the two energy levels involved in the transition.

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3 years ago

With what average speed must you drive your car if your average speed for the entire 23 km is to be 25 km/h?

aksik [14]

Answer:

25km/h

Explanation:

This is a trick question, the average speed in this case does not really depend on calculation or extrapolation, it just refers to an event that is yet to occur,

In other words, if you want to achieve an average speed of 25km/h for 23km, then you should drive your car at a constant speed of 25km/h, any variation in speed may cause a change in your average speed at the end.

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3 years ago