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3 years ago

What is the critical angle for light going from crown glass to air?

Physics

1 answer:

GarryVolchara [31]3 years ago

3 0

Answer:

The critical angle for a diamond in air is 24 degrees, while the critical angle for glass is 41 degrees.

Explanation:

Rays exiting the material at an angle less than the critical angle will be refracted, and rays incident on the interface at greater than the critical angle will be totally reflected back inside the material.

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A particle begins to move with uniform acceleration. If in the first second it travels 3m

nataly862011 [7]

Answer:6m

Explanation:

8 0

3 years ago

Let's say you have a plot for Pendulum experiment. Let's assume g for this experiment was measured (from the slope of the plot)

Gemiola [76]

Answer:

0.0052 m

Explanation:

$T^2=0.021\ s^2$

g = Acceleration due to gravity = 9.78 m/s²

Time period

$T=2\pi \sqrt{\frac{L}{g}}\\\Rightarrow T^2=4\pi^2 \frac{L}{g}$

$\Rightarrow L=\frac{T^2g}{4\pi^2}$

$\Rightarrow L=\frac{0.021\times 9.78}{4\pi^2}\\\Rightarrow L=0.0052\ m$

The length of the pendulum is 0.0052 m

3 0

3 years ago

The main two factors that control the metabolic rate are __________________.

kkurt [141]

5 and 3

Hope I helped

8 0

3 years ago

Read 2 more answers

The sum of the digits of a two-digit number is 6. When the digits are reversed, the number decreases by 18. Find the original nu

Setler [38]

<h2>The number is 42 </h2>

Explanation:

Let the digits be a and b.

The sum of the digits of a two-digit number is 6

That is

a + b = 6

When the digits are reversed, the number decreases by 18

ab - ba = 18

We need to find the number

Since ab - ba = 18, we know that a is greater than b.

Take a = 4

4 + b = 6

b = 6 - 4 = 2

That is the number is ab = 42

When it is reversed the number is 24.

42 - 24 = 18, hence correct

The number is 42

7 0

3 years ago

How fast must an object move before its length appears to be contracted to one-fourth its proper length? (Give your answer in te

Tresset [83]

Answer:

Explanation:

From the relativistic equation for length contraction, we have

$l$ = $l_{0}\sqrt{1 - \beta }$

where

$l$ is the final length of the object

$l_{0}$ is the original length of the object before contraction

β = $v^{2} /c^2$

where v is the speed of the object

c is the speed of light in free space = 3 x 10^8 m/s

The equation can be re-written as

$l$ / $l_{0}$ = $\sqrt{1 - \beta }$

For the length to contract to one-fourth of the proper length, then

$l$ / $l_{0}$ = 1/4

substituting into the equation, we'll have

1/4 = $\sqrt{1 - \beta }$

substituting for β, we'll have

1/4 = $\sqrt{1 - v^2/c^2 }$

squaring both side of the equation, we'll have

1/16 = 1 - $v^2/c^2$

$v^2/c^2$ = 1 - 1/16

$v^2/c^2$ = 15/16

square root both sides of the equation, we have

v/c = 0.968

v = <em>0.97c</em>

3 0

3 years ago