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d1i1m1o1n [39]
3 years ago
15

A rough surface does not shine why?​

Physics
2 answers:
ANTONII [103]3 years ago
8 0

Explanation:

Smooth surfaces could reflect light, and rough surfaces do not. Because of the nature of the substances. Things with a rough surface could scatter light, or reflect it in all directions. This makes them look dull and doesn't shine.

bonufazy [111]3 years ago
7 0
This is the answer to the question
I hope this help you
Thank you for your question.!

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Can someone please explain how to solve 13?
frozen [14]

Hello!

Everything you've done so far seems to be correct. However, you need to get rid of the sin. To do this, use ssin^{-1}.

This is known as the inverse of sin, which is where you go from a fraction to the actual angle itself.

When you run sin^{-1}(1/5) through a calculator, you get about 11.537 degrees, or θ = 11.537.

To verify this, all you need to do is run sin (11.537), and the calculator returns 0.2, which is what we're looking for.

Hope this helps!

8 0
3 years ago
Express 79 m in units of (a) centimeters
dem82 [27]

Answer: a) 7,00 centimeters

(b) 259. 19 feet

(c) 3110.28 inches

(d) 0.049 miles

Explanation:

(a) We know that 1 meter = 100 centimeters

Therefore,

79\ m= 7,900\text{ centimeters}

(b)Since 1 meter = 3.28084 feet

Then, 79\ m= 79\times3.28084=259.18636\approx 259.19\text{ feet}

(c) Since, 1 feet = 12 inches.

79\ m=259.19\text{ feet}=259.19\times12=3110.28\text{ inches}

(d) \text{Since 1 feet= }\dfrac{1}{5280}\text{ mile}

79\ m=259.19\text{ feet}=\dfrac{259.19}{5280}= 0.0490890151515\approx0.049\text{ miles}

8 0
4 years ago
? is the change in position relative to an initial location
umka21 [38]

Answer: c. displacement

Explanation:

Let's begin by stating clear that motion is the change of position of a body at a certain time. So, during this motion, the body will have a trajectory and a displacement.

In the specific case of the displacement, it is defined as the distance in a straight line between the initial and final position (is a vector magnitude).

Therefore:

Displacement s the the change in position relative to an initial location.

7 0
4 years ago
Read 2 more answers
If the electric intensity between two parallel plates, placed 1cm apart is 104 NC-1and the direction of the field of this intens
ankoles [38]

The force of a charge in an electric field is:

\vec{F}_e=q\vec{E}

In this case we know the electric field is:

\vec{E}=104\hat{j}

and that the charge is that of the electron, then we have:

\begin{gathered} \vec{F}_e=-1.6\times10^{-19}(104\hat{j}) \\ \vec{F}_e=-1.664\times10^{-17}\text{ N} \end{gathered}

Therefore, the magnitude of the force is

1.664\times10^{-17}\text{ N}

and in points down.

The weight of the electron is:

\begin{gathered} W=1.67\times10^{-27}(9.98) \\ W=1.6366\times10^{-26} \end{gathered}

Making the quotient between the force we have:

\frac{1.664\times10^{-17}}{1.6366\times10^{-26}}=1.02\times10^9

Therefore, the electric force is approximately 1e9 times the weight.

3 0
2 years ago
Which of the following best describes an isotope? Which of the following best describes an isotope? an atom with an unequal numb
deff fn [24]

Answer:

a structural variation in which different atoms of the same element have different numbers of neutrons

Explanation:

An isotope is an atom of an element having the same number of protons but different number of neutrons. Different isotopes are used for different purposes. Example: some are used in medicines , food irradiation, etc.

Carbon has three isotopes  C 12, C 13, C 14. All three of them have 6 protons but have different numbers of neutrons.

C 12 is a common element and is abundant in nature

C 13 is less abundant than C 12

C 14 is used for dating fossils . It is radioactive

6 0
3 years ago
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