hey, what is rectilinear propagation of light ?​

Answers

Answer 1
Rectilinear propagation of light refers to the propensity of light to travel along a straight line without any interference in its trajectory. When light travels through a medium, say air or water, it follows a straight line.

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Related Questions

equation for power work done and time

Answers

Answer:

power can be expressed as P=work/change in time,instead of P=change of energy/change in time because the change of energy is basically the work done.

Answer:

P=W/T....is the answer

Aunt Mary needs to hang a picture in her bedroom. She uses a hammer to drive the nail into the wall. Find the force exerted by the hammer on the nail if the hammer stays in contact with the nail for 0.5s and has an impulse of 25Ns

Answers

Answer:

50N

Explanation:

Impulse = Force × Time

25 = Force × 0.5

Force = 25/0.5

= 50N

what is the electric potential difference of 5cm from a point charge of -2.0µc

Answers

Answer:

V = 360 kV

Explanation:

Given that,

Charge, q = -2µC

We need to find the electric potential difference of 5cm from a point charge.

We know that the formula for the electric potential is given by :

[tex]V=\dfrac{kq}{r}\\\\V=\dfrac{9\times 10^9\times 2\times 10^{-6}}{0.05}\\\\V=360000\ V[/tex]

or

[tex]V=360\ kV[/tex]

So, the electric potential difference is 360 kV.

A small motor uses 200 watts to do 4000 joules of work. How much time this take to occur?​

Answers

The answer is 20 seconds.


1. Which is an example of chemical potential
energy changing to kinetic energy?
A. a flag flapping in the wind
B. logs burning on a fire
C. using a battery in a flashlight
D. burning fuel to move a car

Answers

D. burning fuel to move a car

Uranium is an element. Which type of matter is uranium?
A. A pure substance
B. A homogeneous mixture
C. A compound
D. A heterogeneous mixture​

Answers

Uranium is an element. Uranium is a pure substance kind of matter. Thus, the correct option is A.

What is a pure substance?

A pure substance is a single type of matter which cannot be separated or divided into other smaller kinds of matter through any kind of physical means or chemical decomposition. A pure substance always has a definite and a constant composition. A mixture is a physical combination which is made up of two or more kinds of pure substances in which each of the substance retains its own chemical identity in the compound.

Uranium is a chemical element with the symbol of U for its representation and the atomic number of 92. Uranium element is a silvery-grey metal in the actinide series of the periodic table of elements. A uranium atom has both 92 protons and 92 electrons, of which 6 of these electrons are valence electrons.

Therefore, the correct option is A.

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Answer:

A

Explanation:

A solar eclipse may occur when:

A. when the moon is 3rd quarter phase
B. when the moon is full
C. when the moon is at 1st quarter phase
D. when the moon is new

Answers

D. When the moon is new

What will happen to a balloon filled with air when you cool the balloon in ice

Answers

Answer:

the volume of balloon decreases by the lower temperature because the gas inside is cool down

I can't understand
like which energy changes are involved
which energy it was first and which it was converted into

Answers

Answer:

turtle

Explanation:

1. Your car's engine suddenly dies as you're driving 35m/s down the highway. If the sum of friction forces on your car is 7000N and your car weighs 1300kg at what rate will you accelerate to a stop? |​

Answers

Answer:

Explanation:

Frictional force = 7000 N

mass of car = 1300 kg . Initially car was moving uniformly so no force acting on car at that time . After frictional force acts , it creates deceleration or negative acceleration .

acceleration = force / mass

= - 7000 / 1300

= - 5.38 m / s²

PHYSICS physics help me pls!

Answers

the question is not clear for me the mass of the word and the pivot the artist as the counterweight of the end we calculate the mass of the counterweight sorry

Answer:

calculate mass of the counterweight?

Explanation:

Find the magnitude of the sum of two vectors; A is 5 km , and B is 7 , when the angle btween them is 120

Answers

Answer: 6.24 km

Explanation:

Given

The magnitude of the first vector(say) [tex]\left | a\right |=5\ km[/tex]

the magnitude of the second vector(say) [tex]\left | b\right |=7\ km[/tex]

the angle between them is [tex]120^{\circ}[/tex]

The resultant vector magnitude is given by

[tex]\left | \vec{R}\right |=\sqrt{a^2+b^2+2ab\cos \theta}[/tex]

[tex]\left | \vec{R}\right |=\sqrt{5^2+7^2+2\times 5\times 7\cdot \cos 120^{\circ}}\\\left | \vec{R}\right |=\sqrt{74-35}=\sqrt{39}\\\left | \vec{R}\right |=6.24\ km[/tex]

PLS ANSWER FAST WILL GIVE BRAINLY!! BUT ONLY IF YOU KNOW!!

Fill in the blank

The atomic number is the same as the number of____in an atom

Answers

The atomic number of an element is represented by the number of PROTONS in the nuclear of the atom of that element

A reference point allows you to determine the _____________of an object state state speed speed position position dimension

Answers

Answer:

Position.

Explanation:

Motion can be defined as a change in the location (position) of a physical object or body with respect to a reference point.

This ultimately implies that, motion would occur as a result of a change in location (position) of an object with respect to a reference point or frame of reference i.e where it was standing before the effect of an external force.

Mathematically, the motion of an object is described in terms of acceleration, time, distance, speed, velocity, displacement, position, etc.

A reference point refers to a location or physical object from which the motion (movement) of another physical object or body can be determined.

For example, a point on a map is considered to be a reference point because it represents the starting point of an object or person in motion.

Hence, a reference point allows you to determine the position an object.

Anthony walks to the pizza place for lunch. He walks 1km east, and then 1 km east again. What distance did he cover? What was his displacement?​

Answers

Answer:

Distance covered by Anthony is 3 km. Don't know about displacement though.

On a box are the words 12 Volt : 50 mA
What is the resistor in Kilo-Ohm?

Answers

Answer:

R = 0.24 kilo-ohm

Explanation:

Given that,

Voltage, V = 12 volt

Current, I = 50 mA = 0.05 A

We need to find the resistance of the resistor. We can find it using Ohm's law. So,

V = IR

[tex]R=\dfrac{V}{I}\\\\R=\dfrac{12}{0.05}\\\\R=240\ \Omega[/tex]

or

R = 0.24 kohm

So, the value of resistance is 0.24 kilo-ohm.

The velocity of a car increases from 10 km/h to 50 km/h in 5 seconds. What is its acceleration?

Answers

Answer:

2.22m/s^2

Explanation:

Select the correct answer from each drop-down menu.
Two magnets are placed as shown in the image.
The force of (Attraction or repulsion)
between the poles B and C is (Maximum or minimum)
And the force of (Attraction or repulsion)
between the poles A and D is (maximum or minimum)

Answers

Answer:

The force of the (attraction) between the poles B and C is (maximum) and the force of a (attraction) between the poles A and D is (minimum).

Explanation:

Waves are observed passing under a dock. Wave crests are 8.0 meters apart. The time for a complete wave to pass by is 4.0 seconds. The markings on the post submerged in water indicate that the water level fluctuates from a trough at 6.0 meters to a crest at 9.0 meters. Calculate the velocity of the wave.

Answers

Answer:

  2 m/s

Explanation:

The crest of the wave moves 8 meters in 4 seconds, so its speed is ...

  (8 m)/(4 s) = 2 m/s

Answer:

2 m/s is the answer .

Explanation:

#CarryOnLearning

please help me i neeed help with all threeas soon as possible thank you

Answers

Answer:

4b: comets

5a: supercluster

5b: they just changed 4b's solar system for milky way. I think it is still comets. if not, then just say black holes.

2.
The IMA of an inclined plane 8m long and 2m high is ______.

16

4

2

8

Answers

Answer:

Explanation:

4

a car is traveling 20 m/s. it takes 4 seconds with a 7,500 n force to come to a stop. what is the mass of the car​

Answers

Answer:

mass equals 375 kg

Explanation:

f=ma

f=7500

a=20

m=f/a

m=7500/20

m=375

1500 kg  is the mass of the car​.

What is Newton's second law of motion?

Newton's second law of motion describes the relationship between an object's mass and the amount of force needed to accelerate it.

Newton's second law is often stated as,

F=ma, which means the force (F) acting on an object is equal to the mass (m) of an object times its acceleration (a).

According to the question,

Mass = 20m/s , Time = 4s , Force = 7500 N

a = Δv/Δt

a = 20m/s / 4s

a = 5 m/s²

If F = ma then,

7500 N =  m x 5 m/s²

m = [tex]\frac{7500 N }{ 5m/s^{2} }[/tex]

m = 1500 kg

Therefore,

1500 kg  is the mass of the car​.

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A volume of 25 milliliters is the same as a volume of ____________________ cubic centimeters.

Answers

Answer:

25 cm³

Explanation:

In the conversion of units, we know that are one cubic centimeters (cm³) in a milliliter (mL) .

1 milliliter = 1 cubic centimeter

25 milliliters = 25 cubic centimeters

Therefore, a volume of 25 milliliters is the same as a volume of 25 cubic centimeters.

This ultimately implies that, the volume of an object in milliliters is equivalent to its volume in cubic centimeters.

what allows electrons to move through it easily

Answers

They are called conductors

Answer:

materials that allow many electrons to flow freely are caused conductors such as copper, silver, aluminum, hydrochloric solution, sulfuric acid, and salt water. in contrast materials which allow few electrons to flow are called insulators such as plastic, rubber, glass, and dried paper.

Explanation:

Hope this helped Mark BRAINLEST!!

Someone plz help I’m on a time limit :(

What patterns occur in the Earth-Sun-Moon system that allow us to identify the cause of
eclipses?

Answers

Answer:

Earth's rotation and orbit and the Moon's orbit cause observable patterns (Day and night, seasons, phases of the Moon, tides).

I need help with 1-3 and 6-9

its do today need help with all of the questions plzzzzz

Answers

Answer:

56767475457345621251461

Explanation:

Answer:

1.C

2.B

3.A

i need a better picture to help with 6-9

PLEASE HELP WILL GIVE BRAINLIEST (I NEED TWO PICKED) PLZzZZZZ AND THxS

Answers

Answer:

A and B

Explanation:

They contain Chlorophyll

They are relatively tall

5. A bird flies with a speed of 3.5m/s towards the north. Determine the distance the bird flew in 3 minutes.

Answers

Answer: I believe it may be 18m/s I apologize if it isn't but have a great day :DDD

Which of the following is NOT a correct statement regarding the theory of evolution?

The offspring of a species compete with each other for limited resources.
All organisms in a species are genetically unique.
The offspring of a species with the most favorable traits have the best chance for survival.
All organisms evolve at the same rate.

Answers

the answer is "all organisms evolve at the same rate" :)

Answer:

answer is b

Explanation:

How can I skip class:

A: Fake sick.
B: Have a heating pad on my heat to have a fake fever.
C: Fake barf
D: Act fine until a test the neb sick

Answers

Answer:

c gl

Explanation:

::::::::::::::::::::::::

Thanks for the free points I would do C
Other Questions
Solve for x: 14x = 196.(Only the number) ten by: Lucas HendersonAt school the next day, there was a strange atmosphere when Hannah walked intoclass. "Hmm. This isn't right," she thought. As she walked to her desk, she noticed that severalstudents were huddled around Leo's desk and that he had red rings around his eyes. He looked upat Hannah and said, "Why are people so mean?" Hannah didn't know what to say and stopped asLeo put his head into his hands. "Are you okay, Leo?" Hannah asked. She knew it was a silly thingto ask; he obviously wasn't okay at all. One of the other students said, "Someone postedsomething nasty about Leo online last night. He's just seeing it now."Hannah felt nauseated. Things like this had happened at her school before, and she knewthat they never ended well. Leo had a very good question. Why are people so mean? That was areal mystery. Someone probably posted something online thinking it to be funny. They didn't thinkabout how Leo would feel when he found out, and they obviously didn't think about how it wouldfeel if anyone did that to them.Just then, the principal walked into the class looking stern and angry. "Will and Emily. Myoffice. Now!" he barked. The two students kept their heads down as they gathered their bags andleft the room, desperate not to look at anyone as they left. Hannah realized that they were alreadyembarrassed about what they'd done. Maybe they were already thinking about how upset theirparents would be when they found out from the principal exactly how callous, thoughtless, andmean they'd been.No one saw Will and Emily at school again that day.The next morning, when Hannah got to her classroom, she saw everyone standing outside,gazing at the lockers. As she approached, she noticed that people were smiling and laughing.There were colored sticky notes on each of the lockers. As she got closer, she began to smile - thepositive energy was contagious, and she hadn't even seen what was on there yet. Each locker had at least two sticky notes on the door. Some sticky notes had silly jokes;some said things like, "What do you call a dinosaur who likes words? A Thesaurus!" Others hadpositive statements, such as, "You are truly wonderful!" Everyone was reading each other's lockernotes and sharing the jokes. Hannah joined in and was pleased to see Leo laughing along witheveryone else. At one point, someone said, "Mine says I am clever and funny," and Leo replied, "No,it says ... ", and then didn't finish his sentence. No one else noticed, but Hannah thought this was abit strange. She caught Leo's eye and smiled at him. He smiled back before turning to someoneelse.Hannah thought about Sherlock Holmes's words. The art of investigating is in seeing whatothers don't see. All of her classmates were looking at the lockers when someone said, "Who didthis?" No one owned up, but everyone kept smiling.It took a while before people realized that Will and Emily were now on the outskirts of thegroup, trying to get to their lockers. Both of them were obviously still humiliated by their actions.Hopefully they regretted their actions. Their heads were bowed, and they didn't try to talk toanyone. Hannah saw them look at the sticky notes on their lockers. On both of them it said, "Be thebest person you can be!" No one else had the same message on his or her locker, apart from Willand Emily. Just then, everyone else moved into the classroom. Just before she went in, Hannahheard Leo say good morning to them both before he went in. Emily and Will looked surprised, notjust at their lockers, but at Leo's greeting, too.When their teacher arrived, he said, "The lockers look great, but I don't think this shouldhappen every day. Does anyone want to own up to this? No? Okay, let's just leave it then." Hannahcaught Leo's eye. 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