7. It takes 1 second to hear the reflection of a loud noise made in front of a large barrier. If
the speed of sound in air is 340 m/s, how far away is the barrier?
A. 85 m
B. 170 m
C. 340 m
D. 680 m

Answers

Answer 1

Answer:

C 340 m

Explanation:

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Related Questions

How are radio waves modified to send information?

Answers

Answer:

Radio waves can be modified by their amplitude or frequency in order to transmit sound or data.

Explanation:

Hope this helped!!!

What do scientists use satellites for?
(there is no science colum)

Answers

Answer:

NASA satellites help scientists study Earth and space. Satellites looking toward Earth provide information about clouds, oceans, land and ice. They also measure gases in the atmosphere, such as ozone and carbon dioxide, and the amount of energy that Earth absorbs and emits. And satellites monitor wildfires, volcanoes and their smoke.

Explanation:

Hope this helps! :) have a great day.

1. GPS

2. Internet

3. Weather forecast

4. Observation

5. Experiments

6. Discovery

Which changes in surface water movement are likely
to occur when vegetation is removed from the side of
a hill?
A) infiltration decreases and runoff decreases
B) infiltration decreases and runoff increases
C) infiltration increases and runoff decreases
D) infiltration increases and runoff increases

Answers

Answer:

infiltration decreases and runoff increase

Explanation:

The changes in surface water movement which is likely to occur when vegetation is removed from the side of a hill is infiltration decreases and runoff increases.

What is surface overflow?

Surface overflow is the flow of water which take place on the surface of the ground. The extra water due to rain or flood arises on the ground or at the surface, flows in the nearby lacks or ponds.

Now if the vegetation is removed, great amount of water started to come from the hills. The result of it, more water started to overflow on the land of the surface. This way the runoff increases.

Infiltration is the way by which the ground level water enters into the soil of the earth.

Now, if the vegetation is removed, a lot of amounts of water started to come from the hills. This excess amount of water does not enter in to the soil of the earth.

The changes in surface water movement which is likely to occur when vegetation is removed from the side of a hill is infiltration decreases and runoff increases.

Learn more about the Infiltration here;

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what is the line that joins northen and southren hemisphere of the earth is called a

Answers

The line is called equator.

GIVING BRAINLIEST PLEASE HELP!!
-if you answer correctly ill give you brainliest which will give you 25pts-

Answers

Answer:

mechanic and potential?

Explanation:

I comment so u can give her brainliest

A magnet can generate an electric current in a wire if the magnet is close enough to the wire and if the magnet is also
A.)strong
B.)weak.
C.)at rest.
D.)in motion.

Answers

Answer:a stro

Explanation:

A magnet can generate an electric current in a wire if the magnet is close enough to the wire and if the magnet is also in motion. The correct answer is D) in motion.

What is electromagnetic induction?

When a magnetic field is in motion with respect to a conductor, such as a wire, it induces an electric current in the wire. This is because the changing magnetic field creates a changing electric field around the wire, which causes electrons to flow. The induced electric current is proportional to the rate of change of the magnetic field. This consequence is known as electromagnetic induction.

The strength of the magnetic field does affect the magnitude of the induced electric current, but the magnetic field must be in motion in order to generate an electric current.

A weak magnetic field can still generate an electric current in a wire if it is in motion with respect to the wire.

If a magnetic field is at rest, it will not induce an electric current in a wire. The magnetic field must be in motion in order to generate an electric current.

Thus, the correct answer is D) in motion.

Learn more about electromagnetic induction here:

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As distance increases, gravitational force________

Answers

Answer:

Decreases

Explanation:

Answer:

Decreases

ExplanatIon:

A bowling ball with 218 J of kinetic energy is moving at 8.0 m/s. What is the mass of the bowling ball?

Answers

EK= 0.5mv^2
218= 0.5(m)(8)^2
218= 32m
M= 6.8125

Lee knew that certain events occur to create new material in the process of sea-floor spreading. Rearrange the steps into the correct order by placing the event that happens first at the top. Place the event that occurs last at the bottom.

Answers

Answer:

Seafloor spreading is a geologic process in which tectonic plates—large slabs of Earth's lithosphere—split apart from each other. ... As tectonic plates slowly move away from each other, heat from the mantle's convection currents makes the crust more plastic and less dense.

Explanation:

did this help???

The correct order for in a breach in the Earth's crust, molten material pours upward is (2), (3) and (4).

What is the earth's crust?

The Earth's Crust is the planet's outermost layer. The Crust is a portion of the lithosphere that lies above the mantle and comprises tectonic plates that provide a platform for all land on Earth.

We have:

Lee knew that certain events occur to create new material in the process of sea-floor spreading.

The correct order for in a breach in the Earth's crust, molten material pours upward:

The molten material hardens into solid strips of rock on both sides of the crack.The ocean floor on both sides of the crack moves farther away from the mid-ocean ridge.The ocean floor gradually becomes wider.

Thus, the correct order for in a breach in the Earth's crust, molten material pours upward is (2), (3) and (4).

Learn more about the earth's crust here:

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This parallel circuit has three resistors R1-120 ohm; R2-45 ohm: R3=360
ohm and a power source of 240 volts.. Find the total resistance of the
circuit.
O 2.491 ohm
O 1.382 ohm
O 0.582 ohm
O 0.033 ohm

Answers

Answer:

the answer is 30 Ohms. Not found in the options provided

How much force required to prevent a book from falling if the mass of the book is 50 grams?

Answers

Answer:

The gravitational force on a mass is its weight. We can write this in vector form, where  

w

is weight and m is mass, as

w

=

m

g

.

In scalar form, we can write

w

=

m

g

.

Since  

g

=

9.80

m/s

2

on Earth, the weight of a 1.00-kg object on Earth is 9.80 N:

w

=

m

g

=

(

1.00

kg

)

(

9.80

m/s

2

)

=

9.80

N

Explanation:

A 10cm3 sample of copper has a density of 897g/cm3. What is the mass of the sample?

Answers

Question:-

A 10cm³ sample of copper has a density of 897g/cm³. What is the mass of the sample ?

Answer:-

Given:-

Density of sample of copper is 897g/cm³.

Volume of sample of copper is 10cm³.

To Find:-

The mass of the sample.

Solution:-

We know,

[tex] { \boxed{\bf{\rm \red {Mass \: = \: Density \: × \: Volume}}}} [/tex]

So, Mass = 897g/cm³ × 10cm³

Mass = 8970 g

The mass of the sample is 8970 g. [Answer]

True or false? In a linear relationship, a change in one variable will always result in a change of the
same size in the other variable.

Answers

The statement 'in a linear relationship, a change in one variable will always result in a change of the same size in the other variable' is FALSE.

What is a linear relationship?

A linear relationship is a type of association between two variables where a change in one produces a direct modification in the another one.

A linear relationship may change depending on the rate of change and therefore the size of this variation is not the same.

In conclusion, the statement 'in a linear relationship, a change in one variable will always result in a change of the same size in the other variable' is FALSE.

Learn more about linear relationships here:

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what is th resistance force when you walk up an inclined plane?

Answers

Explanation:

Friction is a force that offers resistance to movement when one object is in contact with another

Answer:

Friction is a force.

Explanation:

Have a wonderful day.

What is the momentum of a 4 kg object moving west at 4 m/s?*
O 12 kg*m/s (east)
O 1.33 kg*m/s (west)
O 16 kg*m/s (east)
16 kg*m/s (west)

Answers

Answer:

16kg*m/s west

Explanation:

P=M*V

Momentum= Mass time velocity, plug it into the formula,

M is 4 and V is 4, 4*4=16, and since the object is moving west its going to be west.

basically saying in simpler terms,

16=4*4

I Need Help, Thank you! ^^ <3
How can global warming lead to changes to the Earth’s surface?
a.
Global warming can lead to an increased number of earthquakes, which change the Earth’s surface.
b.
Global warming can lead to glaciers melting, causing flooding to areas and the decrease of glacial land masses.
c.
Global warming leads to a decrease in water levels of coastal wetlands.
d.
Global warming cannot lead to changes to the Earth’s surface.


Please select the best answer from the choices provided

A
B
C
D

Answers

Answer:

A

Explanation:

But global warming will have additional, far-reaching effects on the planet. Warming modifies rainfall patterns, amplifies coastal erosion, lengthens the growing season in some regions, melts ice caps and glaciers, and alters the ranges of some infectious diseases.

Answer:

I think it is B since Global warming can lead to glaciers melting and cause flooding since the water will get warmer resulting in the ocean rising, which causes flooding

Explanation:

How many cups of water should you drink in a day?

Answers

Answer:

about 2.7liters for women and 3.7liters for men

Explanation:

After rubbing a rubber brush on wool, Gilbert is able to use the brush to pick up small strips of paper. What causes the paper to be attracted to the brush?
A.) gravity
B.)electric current
C.) static electricity
D.)magnetism

Answers

Static electricity because when you rub something against a surface, there is friction aka static electricity.

After rubbing the a rubber brush on the wool it gets a charge acquired by the passage of electrons. The electrons from the wools escapes to the brush and thus the paper get attracted to electrons in the brush. Hence, option B is correct.

What is electric current?

Electric current is the passage of electrons from the negative end to positive end of a  potential difference.

When a an object is rubbed on a conducting material it gets some electrons into it.  When this material comes in contact with another object which have random distribution of charges will attracts the electrons by its positive end.

The rubber brush gets negatively charged on rubbing.  Paper have positive and negative charges in random. When it comes in contact with the negatively charged brush the electrons in the paper repelled away.

The positive charges thus accumulates on the other end of the paper and attracted to the brush. This is an example of static current. Hence option B is correct.

To find more about static current, refer the link below:

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Gamma ray technology can be used to do which of the following?
A. Monitor human activity at night
B. Treat tumors in the body
C. Speed up the process of hardening paint
D. Communicate across long distances

Answers

Answer:

b

Explanation:

radiation can treat tumors.

Answer:

B. Treat tumors in the body

Explanation:

took quiz

Samantha is identifying different minerals she found on vacation. Which property of the minerals will Samantha be LEAST able to determine by using only her eyes? A. Color B. Hardness C. Luster D. Texture

Answers

Answer: b

Explanation:

Given

Samantha is identifying different minerals by her eyes only. She will able to make a certain judgment for color, luster, and texture but not for hardness.

Hardness is the property of the material which tells about the resistance to the deformation. So, it is impossible to determine the hardness just by looking at the material. We need to perform certain tests like Brinell's hardness test, Vicker's hardness test.

Can someone help me with this science one please

Answers

I AM MEMELORD!!!!! SLAYER OF THE KARENS!!! SPEAKER OF THE THE MEMES. APPROACH SPEAKER AND ASK YOUR QUESTION!

Given equal time periods, which statement about radioactive waste is correct?
A. Radioactive decay and nuclear fission always generate the same amount of waste.
B. Nuclear fusion generates less radioactive waste than radioactive decay does.
C. Nuclear fusion generates less radioactive waste than nuclear fission does.
D. Nuclear fission generates less radioactive waste than radioactive decay does.

Answers

I think the answer is C


A positive charge moving with a constant velocity v enters a region
of a uniform magnetic field pointing to the top of the page. What
is the direction of the magnetic force on the charge?
A. Left.
B. Right.
C. To the bottom of the page.
D. To the t&p of the page.
E. There is no magnetic force on the charge.

Answers

answer is Answer is E , using the right hand rule

Explain how energy that comes from the outside of the Earth system drives the flow of water on surface currents.

Answers

Answer:

The ocean and atmosphere are connected. They work together to move heat and fresh water across the globe. Wind-driven and ocean-current circulations move warm water toward the poles and colder water toward the equator. ... The majority of the thermal energy at the Earth's surface is stored in the ocean.

Explanation:

The ocean and atmosphere are connected. They work together to move heat and fresh water across the globe. Wind-driven and ocean-current circulations move warm water toward the poles and colder water toward the equator. ... The majority of the thermal energy at the Earth's surface is stored in the ocean.

Julio has a green plant on his bedroom window sill. This summer Julio and his family will be traveling. No one will be home for month. Which is julio most likely to find when he returns home from his trip

Answers

Answer:

Explanation:

A withered plant. Unless the plant is one of the many plants that have huge water retention capacity, for example, cactus. Such plants also don't need water to gr6, they just need a tiny amount of water, ba sufficient sunlight to enable them complete photosynthesis.

Any other plants asides one of the many like that, he will definitely come back to a dead, or at best, withered plant. A month is too long a time to not take care of your plant and expect it to still be up and running

GIVING BRAINLIEST PLEASE HELP!!
-if you answer correctly ill give you brainliest which will give you 25pts-

Answers

Answer:

A, and D are the answers

Explanation:

The pulley. It is located where the bicycle chain and gears are. The chain is wrapped around the pulley which turns and causes the wheel to turn on its axle.

How was our galaxy formed?

Answers

Answer:

according to big bang theory our galaxy was formed 13billion years ago and then made the stars and galaxies we see today. ... The universe began as a very hot, small, and dense superforce (the mix of the four fundamental forces), with no stars, atoms, form, or structure (called a "singularity).

LITERALLY HELP IMBEGGING YOU GUYS ANYONE IM NEEED HELP

Answers

Explanation:

The energy of a photon is given by :

[tex]E=\dfrac{hc}{\lambda}[/tex]

Where

h is Planck's constant

c is the speed of light

[tex]\lambda[/tex] is wavelength

or

[tex]E=hf[/tex], f is the frequency

Energy is directly proportional to the frequency of an object.

The energy transported by a wave is directly proportional to the square of the amplitude.

The magnetic field of a bar magnet Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a Always points from north to south, whether we look outside the magnet or inside the magnet. b Always points from south to north, whether we look outside the magnet or inside the magnet. c Points from north to south outside the magnet, but south to north inside the magnet. d Points from south to north outside the magnet, but north to south inside the magnet.

Answers

Answer:

A: Always points from north to south, whether we look outside the magnet or inside the magnet

Explanation:

When we freely suspend a bar magnet, it's magnetic field will always rest in the north to south direction due to the fact that the Earth's magnetic south pole usually lies in the direction of the geographic north while the Earth's magnetic north pole usually lies in the direction of the geographic south.

Now, we all know that in magnets, like poles will repel and unlike poles will attract. What this now means is that the magnet will always point from the north to the south direction.

Is weight AFFECTED by gravity?
YES, the force of gravity determines how much you weigh.
NO, regardless of gravity, you will always weigh the same. w​

Answers

Answer:

This answered one of my questions, thanks

Explanation:

Answer:

the answer is NO regardless of gravity, you will always weigh the same.

Explanation:

Look up about 3 centimeters ⬆️

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