Physics Middle School

Which of the following observations demonstrates the differences between speed of light and speed of sound? (Note, they are all true, but which one
represents the difference in the speed?))
A. In space you can see an explosion, but are unable to hear it.
B. A light bulb "pops" when it bums out.
C. You see lightning and then hear the thunder.
D. You are able to hear a sound coming from the apartment next to you, but you cannot see a light coming from a lamp in the apartment

Answers

Answer 1

Answer:

Definitely C.

Related Questions

please help me with these two questions... thanks

Answers

19) C because the object is stationary, the forces are balanced in all directions so no work is being done and therefore no energy is being transferred

20) B because heating it transfers thermal energy and passing a current transfers electrical energy. I think that shining a light for long enough may heat the block up so it could be D but I’m not sure if that’s what it’s asking

The fist one should be C

What is the number of daylight hours of daylight difference in the summer for two regions located at different latitudes in the northern hemisphere?

Answers

To be completely honest the answer is 74

Mahiya and Mrinmoy are in a relay around a square field with each side of length 60m. First, Mahiya runs at a speed of 6 ms−1 for 60m to pass a baton to Mrinmoy. Then Mrinmoy runs 120m at 4ms−1 while Mahiya runs through the field to reach the other corner. Then Mrinmoy passes the baton. But Mahiya is now tired since she has been constantly running. So, she only runs at 3ms−1 for the final 60m. What is the average speed of the baton in ms−1?

Answers

The average speed of the baton can be determined by dividing the total distance travelled by the total time taken for that travelling.

\(Average\ Time = \frac{Total\ Distance}{Total\ Time}\)

First, we will find the total distance, by adding the distances travelled by both Mahiya and Mrinmoy, while carrying the baton.

\(Total\ Distance = Distance\ Travelled\ by\ Mahiya\ to\ pass\ the\ baton\ to\ Mrinmoy\ +\ Distance\ Travelled\ by\ Mrinmoy\ to\ pass\ the\ baton\ to\ Mahiya\ +\ Final\ Distance\ Travelled\ by\\ Mahiya\)Total Distance = 60 m + 120 m + 60 m = 240 m

Now, we will find the total time taken for this travelling. To find out the total time we will divide each distance travelled by the speed of the traveller during that distance:

\(Total\ Time = \frac{60\ m}{6\ m/s}+\frac{120\ m}{4\ m/s}+\frac{60\ m}{3\ m/s}\\\\Total\ Time = 10\ s\ +\ 30\ s\ +\ 20\ s\)

Total Time = 60 s

Now, we finally find the average speed of the baton by using the formula:

\(Average\ Time = \frac{Total\ Distance}{Total\ Time}\\\\Average\ Time = \frac{240\ m}{60\ s}\)

Average Speed = 4 ms⁻¹

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How could you contract HIV through a cut on your finger

Answers

If the blood of someone infected gets mixed in with yours in an open wound, it could transmit the disease to you through the bloodstream.

Essentially you can get it by someone else’s blood going into yours through the cut.

If someone with HIV touched you in an open wound and they had blood on them somewhere that could cause you to get HIV

A spaceship fires a movement thruster, releasing gases at high pressure.
What are the forces in the force pair for this example?
a) the force the gasses apply to the ship
the force the ship applies to the gasses

b) the force the gasses apply to space
the force the ship applies to the gasses

c) the force the gasses apply to space
the force the ship applies to gasses

d) the force the gasses apply to the ship
the force the ship applies to space

Answers

The answer would be D

D. hope this helps :)

Which of the following forces has not changed Earth's surface?

folding
erosion
weathering
gravity

Answers

Answer:Gravity is the force among the options listed that has not directly changed Earth's surface.

Explanation:

Gravity is a fundamental force that acts on all objects with mass, including the Earth itself, but it does not cause changes or modifications to the Earth's surface features. Instead, gravity influences the movement of materials and the shape of the Earth's surface by exerting a pulling force on objects. On the other hand, folding, erosion, and weathering are all processes that directly contribute to shaping

The answer is D. Gravity

When you drop something, first of all it accelerates.
The faster it falls, the bigger the force of ______ that acts on it.
choose from the list to complete the sentence:
friction gravity air pressure

note: apparently the answer is friction but it doesn't make sense to me so please explain.

Answers

The faster an object is going, the more resistance there will be. An example of this would be if you're running the faster you run, the more air is going against you.

I hope this helps!

I think its pressure, please dont take my word for it, take this with a grain of salt, Have a great day<3

list both types of energy before skydiver jumps out of the plane and as the sky diver is diving.

Answers

Answer : This is an example of Kenitic and potential energy

Explanation:

kenitic: the act of moving or motion

potential: not. moving YET

he was not moving when he was on the plane and had potential energy cause he wasn't getting pulled down and kenitic energy was when he was getting pulled down from force of gravity when he was getting pulled to the ground when he was skydiving

Kinetic and potential

Erin is keeping a science journal. She wrote the following paragraph that explains how light travels through different mediums. But she’s made one mistake. Which sentence in Erin’s journal is incorrect?
A ray of light passes through the air and enters the water inside a metal container. The light ray bends as it crosses the boundary between air and water. Once it hits the bottom of the container, the ray gets reflected. The reflected ray passes back through the water and enters the air without bending. In this example, the ray of light is both reflected and refracted.

Answers

Answer: The first part I think

Explanation:

Im not too sure on this one

The second sentence that is marked blue.

PLEASE HELP ASAP
How are force and velocity related? Give evidence to support your answer.

Answers

It states that the time rate of change of the velocity (directed speed), or acceleration, , is directly proportional to the force F and inversely proportional to the mass m of the body; i.e., a = F / m or F = ma; the larger the force, the larger the acceleration (rate of change of velocity); the larger the mass, the smaller the acceleration.

It states that the time rate of change of the velocity (directed speed), or acceleration, , is directly proportional to the force F and inversely proportional to the mass m of the body.

Please fill in the blanks. The words are: qualitative date, quantitative date, bar graph, circle graph, and line graph. Please no fake answers

Answers

Bar graph i think tell me if im wrong

Answer:

There are many types, including: Pie charts and bar graphs are used for qualitative data. Histograms (similar to bar graphs) are used for quantitative data

Explanation:

What two gases in the atmosphere do animals and plants need to breathe and grow?

Answers

Answer: Explanation:

Plants and animals each produce the gases that the other needs to live. Plants need carbon dioxide—people and other animals exhale carbon dioxide as a waste product. People and other animals need oxygen—plants produce oxygen during an important process called photosynthesis, which turns the sun's energy into nutrients.

Carbon Dioxide for plants and Oxygen for animals

What is an example of radiation? A. The heat from a fire B. An old-fashioned radiator C. Batteries D. Touching a stove and burning your hand

Answers

Answer:

The heat from a fire is an example of radiation.

Explanation:

Another example is the heat received by the earth from the sun.

Kristin is going 90 mph. Kristin is 20 miles behind a truck that is driving 50 miles per hour. How long will it take her to catch up to the truck? How far will she go in that time? Time to catch up to truck:
Distance traveled in that time:

Answers

Answer:

She will go 50t miles, = 1000/(r-50) miles.

Explanation:

Depends oh her speed. If she goes r mi/hr, it will take t = 20/(r-50) hours to catch up. She will go 50t miles, = 1000/(r-50) miles.

She would have 50t miles

Help me pls, I'm begging.

Answers

physical scientists examine all the "stuff" or [hypothesis/questions] in the world. they also identify [conclusions] of [observation] and try to figure out what happens to the energy in the universe. the study of physical science makes it possible to understand how everything in the universe works. physical science explains what things are [? made?] of and it also explains [what makes up an object] from planets to dust

I found this so I'm not sure if its correct, but I hope it helps

1. Hypothesis
2.conclusion
3.observations
4.made
5.what make up the object

i swear this is the last question

Which of these is NOT a way to think about finding ‐12−7?

A)The number 7 units to the left of ‐12 on the number line

B)The negative distance between ‐12 and 7 on the number line

C)Changing the signs and the operation: 12+−7

D)The addition expression: −12+−7

PLSSSSSSSSSSSSS

Answers

Answer:

Explanation:

12+-7=/=-12-7

12+-7=5

-12-7=-19

Answer:

the answer is c

Explanation:

This is a science question

Answers

The air currents across the continents would determine the distribution of the air.

What are air currents?

Air currents across the continents are primarily driven by temperature differences and the rotation of the Earth. The warm air near the equator rises and flows towards the poles, while the cooler air near the poles sinks and flows towards the equator.

This creates large-scale circulation patterns known as Hadley cells, Ferrell cells, and Polar cells. These cells are responsible for the trade winds, westerlies, and easterlies, respectively. Additionally, there are also local winds caused by differences in terrain, such as sea breezes and valley breezes.

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please help need asapppp!

Answers

Answer: try invasive species can change the natural habitat of the lake

Explanation:

Maybe humans pouring toxic chemicals in the water, or taking away the things the animals needs

Which automobile is faster a chevrolet or a ford? Also explain pls

Answers

it all depends on the type of vehicle but, it most likely would be the ford.

True or False
If two unbalanced forces act on an object in opposite directions, the object will move in the direction that the stronger force is acting.

Answers

Answer:

true

Explanation:

If two unbalanced forces act on an object in opposite directions, the object will move in the direction that the stronger force is acting. If two forces act in the same direction on an object, the forces add together and the object experiences a greater force in that direction

True
An object in the opposite direction will act on the strongest force

Which technological advancement made the Pony Express unnecessary?
Steamships
Cotton Gin
Telegraph
Steel Plow

Answers

Telegraph! Because telegraphs were used to communicate and to (at that time) send messages rapidly.

Answer: Option (C) is correct, Telegraph

Explanation: Hope it helps!

Good luck!!!

The creation of carbon monoxide is an effect. What is one cause?

Answers

Answer:

THE PROBLEM

Carbon monoxide (CO)—a colorless, odorless, tasteless, and toxic air pollutant—is produced in the incomplete combustion of carbon-containing fuels, such as gasoline, natural gas, oil, coal, and wood. The largest anthropogenic source of CO in the United States is vehicle emissions.

Explanation:

The incomplete burning of the natural gases petrol or diesel is one of the causes of the creation of carbon monoxide.

What is pollution?

It can be defined as the origination of the contaminant substance that poisonous or harmful to our natural environment.

In our environment, pollution can take many different forms depending on the quantity and nature of the contaminant. For instance, the eutrophication process can result in water pollution.

Air pollution persists due to the contaminants present in atmospheric air such as smog.

Land pollution exists because of contaminated soil in the lithosphere.

There are several other types of pollution as well such are sound pollution, radioactive pollution, plastic pollution, oil spill pollution, etc.

When hydrocarbon fuels (such as natural gas, gasoline, and diesel) are burned, carbon monoxide is also produced as a pollutant. The effectiveness of combustion determines the relative amount of CO produced. During their MOT test, older vehicles are inspected yearly for CO emissions. It's interesting to note that only one of the two carbon oxides inhibits combustion; for this reason, carbon dioxide is used in fire extinguishers.

One of the factors contributing to the production of carbon monoxide is the incomplete burning of natural gases such as gasoline or diesel.

Learn more about pollution from here

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Compare two processes we use to measure the age of Earth and its parts.

Answers

Answer:

The three primary methods are: Radiation Measurement. Stratigraphic Superposition. The Fossil Record.

Explanation:

Cuz I know

Cold air masses tend to originate from: Question 3 options: tropical areas an area where it's wintertime an area where it's summertime polar areas

Answers

Answer:

Polar areas

Explanation:

From what I know Arctic, Antarctic, and polar air masses are cold. Polar (cold), Arctic (very cold), Equatorial (warm and very moist), and Tropical (warm).

With the options you gave, you can immeditaly elimate 1. tropical areas and 2. an area where its summertime. Your then left with two options 1. an area where its wintertime and 2. polar areas

I then concluded that cold air masses tend to originate from POLAR AREAS.

Polar areas, Hope this helps

Can someone help me with this science question

Answers

Mechanical layers of the earth:

-Lithosphere
-Asthenosphere
-Mesosphere
-Outer Core
-Inner Core

Chemical layers of the earth:

-Crust
-Mantle
-Core

Hope this helps

Have a great weekend! :)

A.Answers is crust metal and rust hopes this helps you

A white blood cell that destroys pathogens by engulfing them and breaking them down is called please help

A Antigen

B B-cell

C Antibody

D Phagocyte

Answers

Answer: D

Explanation: Its a type of white blood cell that moves by amoeboid

The answer is D. Phagocyte

What causes air to move or circulate from one place to another?

Lesson 1.06

Question 3 options:

Difference in water pressure causes the horizontal motion of air known as wind.

Differences in air pressure cause the horizontal motion of air known as wind.

Difference in water temperature causes the horizontal motion of air known as wind.

Difference in the exosphere causes the horizontal motion of air known as wind.

Answers

Answer:

Explanation:

simple

Differences in the air pressure

HELP 20 POINTSS!!
A 24N force makes a box accelerate 6m/s/s. What is the mass?

(I REALLY NEED A ANSWER) (Science)

Answers

Mass = force/acceleration
M=24/ 6
m=4 N

Energy that comes from the sun—solar energy—is clean. It does not cause pollution the way energy from fossil fuels (like gas and oil) does. However, solar energy must be collected before it can be used. The instruments used to collect solar energy are quite costly.

This paragraph states that solar energy ________.

A) causes a lot of pollution
B) is expensive to collect
C) is one kind of fossil fuel
D) is a cheap way to get energy

Answers

The answer is B
Is expensive to collect

B is the answer because once it is analyzed you can see .

Which of the following statements regarding electric insulators is correct?

Electric insulators are good heat conductors.

Electric insulators have high tensile strength.

Electric charges move freely in electric insulators.

Charges within electric insulators do not readily move.

Answers

Answer:

d because they are poor electricity and heat conductors

charges within electric insulators do not readily move.

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