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Ad libitum [116K]
2 years ago
9

Which are characteristics of a ray when it hits a boundary and refracts, but not when it hits the boundary and reflects? Check a

ll that apply. A. changes direction B. changes speed C. does not change direction D. does not change speed E. bounces off the boundary F. passes through the boundary
Physics
2 answers:
pshichka [43]2 years ago
7 0

Answer: B,F

Explanation:

mrs_skeptik [129]2 years ago
6 0

Answer:

B. changes speed  

F. passes through the boundary

Explanation:

Only these two options are characteristics of a ray when it is refracted, but not when it is reflected. In fact:

Reflection occurs when a ray hits the interface between two mediums and bounces off back. When it is reflected, the ray changes direction, but does not change speed since it does not change medium.

Refraction occurs when a ray passes through the interface between two different mediums. When it is refracted, the ray changes direction, and it changes speed as well, since it changes medium.

Based on these definitions, we can say that only B. (changes speed) and F. (passes through the boundary) are properties of a refracted ray but NOT of a reflected ray. All the other choices are wrong because:

A. changes direction --> it is true for both reflection and refraction

C. does not change direction --> it is false

D. does not change speed --> it is false

E. bounces off the boundary --> it is true only for reflection

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Explanation:

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speed = 6.00 m/s.

thickness = 12

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solution

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v² - u²  = 2 × a × s    ........................1

here v = 0 is the final velocity and u = 6.0 m/s is initial velocity and s= 0.12 m is the distance covered and a is the acceleration

so we put here value and get acceleration

a = \frac{v^2-u^2}{2s}

a = \frac{0^2-6^2}{2\times 0.12}

a = -150 m/s² ( negative sign means it is a deceleration )

and

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2 years ago
Two objects are dropped from rest from the same height. Object A falls through a distance Da and during a time t, and object B f
stiv31 [10]

Answer:

Da=(1/4)Db

Explanation:

t = Time taken

u = Initial velocity

v = Final velocity

s = Displacement

a = Acceleration due to gravity = 9.81 m/s²

When s = Da, t = t

s=ut+\frac{1}{2}at^2\\\Rightarrow Da=0\times t+\frac{1}{2}\times a\times t^2\\\Rightarrow Da=\frac{1}{2}at^2

When s = Db, t = 2t

s=ut+\frac{1}{2}at^2\\\Rightarrow Da=0\times t+\frac{1}{2}\times a\times (2t)^2\\\Rightarrow Db=\frac{1}{2}a4t^2

Dividing the two equations

\frac{Da}{Db}=\frac{\frac{1}{2}at^2}{\frac{1}{2}a4t^2}=\frac{1}{4}\\\Rightarrow \frac{Da}{Db}=\frac{1}{4}\\\Rightarrow Da=\frac{1}{4}Db

Hence, Da=(1/4)Db

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2 years ago
What is the initial velocity of the object represented by the graph? ___m/s Graph:
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Answer:

On a velocity-time graph… slope is acceleration. the "y" intercept is the initial velocity. when two curves coincide, the two objects have the same velocity at that time.

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2 years ago
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Serga [27]
T= 24.5 feet per second. That is the velocity it reaches at the end of its fall
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2 years ago
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A very long uniform line of charge has charge per unit length λ1 = 4.80 μC/m and lies along the x-axis. A second long uniform li
Elodia [21]

Answer:

a) E=228391.8 N/C

b) E=-59345.91N/C

Explanation:

You can use Gauss law to find the net electric field produced by both line of charges.

\int \vec{E_1}\cdot d\vec{r}=\frac{\lambda_1}{\epsilon_o}\\\\E_1(2\pi r)=\frac{\lambda_1}{\epsilon_o}\\\\E_1=\frac{\lambda_1}{2\pi \epsilon_o r_1}\\\\\int \vec{E_2}\cdot d\vec{r}=\frac{\lambda_2}{\epsilon_o}\\\\E_2=\frac{\lambda_2}{2\pi \epsilon_o r_2}

Where E1 and E2 are the electric field generated at a distance of r1 and r2 respectively from the line of charges.

The net electric field at point r will be:

E=E_1+E_2=\frac{1}{2\pi \epsilon_o}(\frac{\lambda_1}{r_1}+\frac{\lambda_2}{r_2})

a) for y=0.200m, r1=0.200m and r2=0.200m:

E=\frac{1}{2\pi(8.85*10^{-12}C^2/Nm^2)}[\frac{4.80*10^{-6}C}{0.200m}-\frac{2.26*10^{-6}C}{0.200m}}]=228391.8N/C

b) for y=0.600m, r1=0.600m, r2=0.200m:

E=\frac{1}{2\pi(8.85*10^{-12}C^2/Nm^2)}[\frac{4.80*10^{-6}C}{0.600m}-\frac{2.26*10^{-6}C}{0.200m}}]=-59345.91N/C

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2 years ago
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