Clarify the concept of refrection index with example

1 answer:

3 0

The refractive index is used to measure how much light bends as it goes from one medium to another the refractive index of air =1 as light doesn’t bend in it

When looking into a glass of water with a straw the straw may appear bent or morphed as the water has a different refractive index to air (and the light is passing from air to glass of water)

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If there is a negative sign in front of the Hooke's Law equation, what does the force, F, represent?

SashulF [63]

Answer:

Hooke's law, given by $F=-kx$ is denoted with a negative sign to regard that the direction of restoring force that occurs opposite in direction of the force that caused the displacement $x$ . F represents the force required to create a spring displacement of $x$ .

Explanation:

As with many things in physics, the negative sign represents direction. In this case, after a spring is displaced a distance of $x$ from equilibrium, the restoring force created by the spring will be in opposite direction of the force applied to move the spring there, represented by F.

6 0

3 years ago

Mimas, a moon of Saturn, has an orbital radius of 1.62 × 108 m and an orbital period of about 23.21 h. Use Newton’s version of K

Drupady [299]

Answer:

$3.60432\times 10^{26}\ kg$

Explanation:

a = Orbital radius = $1.62\times 10^8\ m$

T = Orbital period = 23.21 hours

G = Gravitational constant = 6.67 × 10⁻¹¹ m³/kgs²

From Kepler's third law we get

$M=\frac{4\pi^2a^3}{GT^2}\\\Rightarrow M=\frac{4\pi^2\times (1.62\times 10^8)^3}{6.67\times 10^{-11}\times (23.21\times 3600)^2}\\\Rightarrow M=3.60432\times 10^{26}\ kg$