Physics Middle School

What is power the quotient of?

Question 7 options:

work and time

speed and distance

work and distance

speed and energy

Answers

Answer 1
Power is equal to work divided by time
Answer 2

Answer:

Power the quotient of work and time.

Explanation:

Power is the quotient of work and time. It is also defined as the rate at which any work is done. Work done is equal to the product of force and the displacement. The mathematical formula of power is given by :

[tex]P=\dfrac{W}{t}[/tex]

The SI unit in which power is measured is watts. It is equivalent to Joules per second.Hence, the correct option is (a).

Related Questions

Which statement accurately describes what happens when water turns to steam in terms of energy?

A.The water absorbs energy which causes chemical bonds to break, changing water to steam.

B. The water releases energy which causes the water molecules to have less kinetic and potential energy, changing their configuration from liquid to gas.

C. The water releases energy which causes chemical bonds to break, changing water to steam.

D. The water absorbs energy which causes the water molecules to have more kinetic and potential energy, changing their configuration from a liquid to a gas.

C. The water releases energy which causes chemical bonds to break, changing water to steam.

PLEASE HURRY!!!

Answers

Answer:

D  The water absorbs energy which causes the water molecules to have more kinetic and potential energy, changing their configuration from a liquid to a gas.

Explanation:

Good Luck ^^

The water absorbs energy which causes the water molecules to have more kinetic and potential energy, changing their configuration from a liquid to a gas. The correct option is D.

What is kinetic energy?

The energy an object has as a result of motion is known as kinetic energy. A force must be applied to an object in order to accelerate it.

We must put in effort in order to apply a force. After the work is finished, energy is transferred to the item, which then moves at a new, constant speed.

Energy is absorbed by the water, increasing the kinetic and potential energy of the water molecules and converting them from a liquid to a gas.

Water molecules usually have the highest kinetic energy in the steam phase.

Thus, the correct option is D.

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Describe an environment in which the sound of a ringing cell phone could not be transmitted, and explain why the ringing wouldn't be heard. Justify your reasoning using complete sentences.

Answers

The sound of a ringing cellphone could not be transmitted or heard
if the cellphone is enclosed in some sort of closed container from which
the air has been removed. 

Sound is a mechanical wave, and so it must have some material substance
to travel through.  Otherwise sound cannot travel from one place to another. 

The sound of the ringing could not travel through the vacuum inside
the container if all the air were removed.

Answer:

Explanation:

The sound of a ringing cellphone could not be transmitted or heard if the cellphone is enclosed in some sort of closed container from which the air has been removed.  Sound is a mechanical wave, and so it must have some material substanceto travel through.  Otherwise sound cannot travel from one place to another.  The sound of the ringing could not travel through the vacuum inside the container if all the air were removed.

When the moon is waning, what do we see?

A. none of the moon is visible
B. more and more of the moon
C. a full moon
D. less and less of the moon

Answers

D. less and less of the moon
Hope it helps!

Answer:

D. Less and less of the moon.

Explanation:

Waning has the meaning decreasing. A waning moon is the moon that decreases in size and its illumination . Moon starts waning a day after the full moon. Its size keeps decreasing and ultimately it is not visible on the new moon day .

A day after the new moon, it starts increasing in size and brightness and is slowly visible each night, until it is completely shining on the full moon day again. This is the waxing of the moon, where its size keeps increasing.

Calculate the acceleration of a car that begins at rest at a stop light and accelerates to a speed of 20m/s in a 10 sec time period. Be sure to include the acceleration formula and the final units.

Answers

a = delta v over delta t delta v is calculated with final velocity less initial velocity then delta v is equals to 20 - 0 that is 20m/s and to calculate delta t is like delta v is final time less initial time as initial time always is 0 the delta t is equals to 10s then a = 20/10 then acceleration is 10m/s^2 (remember that is squared)

Brainiest for Right Person!

1. What is the force on an object due to its mass and gravity called?

A)Kilograms
B)Velocity
C)Weight
D)Pounds

2. Which of the following best describes gravitational force?

A)An attraction between two objects that have mass
B)An attraction between two objects due to their electrons
C)The force that keeps atoms and molecules bound together
D)The force that keeps objects from moving when they are at rest

3. How does distance between two objects affect their gravitational force?

A) Force increases as distance increases.
B)Force decreases as distance increases.
C)Force decreases as distance decreases.
D)Force is not related to distance.

4. Imagine you are an astronaut and you travel to a planet with a much larger mass than Earth. How would this affect your weight? Explain your answer.

Answers

C)Weight

A)An attraction between two objects that have mass

B)Force decreases as distance increases.

grav force of massive planet increases your weight

Answer:

C)Weight

A)An attraction between two objects that have mass

B)Force decreases as distance increases.

Explanation:

What is the mass of an object that weighs 55N on earth?

Answers

Weight on earth is 55kg
Force = Mass x Acc.
55N=mass x 9.8
so mass =55/9.8=5.61 aprox.
Now on the planet gravity mass is doubled
F =M x 2a
F =5.61x2x9.2
F=110N=110kg weight

With Earth's gravity being [tex]9.80 m/s^2[/tex] the mass is approximately 5.61 kg.

To calculate the mass of an object that weighs 55N on Earth, we need to use the formula for weight, which is w = mg, where w is weight, m is mass, and g is the acceleration due to gravity.

On Earth, g is typically [tex]9.80 m/s^2[/tex]

Therefore, we can find the mass of an object by dividing its weight by this acceleration due to gravity.

To calculate the mass (m) of an object that weighs 55N on Earth:

m = w / g

[tex]m = 55 N / 9.80 m/s^2[/tex]

This calculation results in a mass of approximately 5.61 kg.

what is the shape of the orbit of satellites

Answers

Every closed orbit is an ellipse.

If the big body just bends the small body's path but doesn't capture it, then the small body's path is a hyperbola.

Answer:

The shape will be elliptical hopefully this helps!



Suppose Eratosthenes’ results for Earth’s circumference were quite accurate. If the diameter of Earth is 12,740 km, what is the length of his stadium in kilometers?

Answers

The Results For Earth's Circumcised were quite accurate. the diameter of earth is 12,740 km, the length of the stadium would be 1,140 km. 

Answer:

Length of one stadium = 0.1556 km

Explanation:

We have the diameter of Earth = 12740 km

Thus, circumference (C) of Earth is

[tex]=2\pi \frac{Diameter}{2} \\[/tex]

[tex]=2\times \pi \times \frac{12740}{2}[/tex]

C = 40023.89 km

Eratosthenes was a Greek polymath. He was the first to calculate the circumference of Earth. He had observed that at local noon on day of Summer Solstice, when Sun is overhead for the locations on Tropic of Cancer, a place named Syene had zero shadow day. Also on the same day the objects in Alexandria casts shadow. This proved that Earth is spherical and not flat. He went further and calculated the Sun angle ([tex]\theta[/tex]) for Alexandria by using a Rod (Gnomon). He found the angle to be about 7°. He also knew the distance (D) between Alexandria and Syene which was 5000 Stadia.

Lets say length of one stadia = S km

He used this data and simple concept of geometry as given below:

[tex]\frac{\theta }{360}=\frac{D}{C}[/tex]

[tex]=\frac{7}{360}=\frac{5000 \times S}{40023.89}[/tex]

[tex]=5000 \times S = \frac{7\times 40023.89}{360}[/tex]

[tex]=S = \frac{7\times 40023.89}{360\times5000}[/tex]

S = 0.1556 km

Magnet A and B are of equal magnetic strength and which position will magnets A&B have the greatest attraction for toward each other

Answers

When they are facing each other, almost touching
Its D.

(sorry the picture got cut off)


What is the periodic table of elements? 

Question 5 options:a chart that organizes all the elements by their atomic number a chart that organizes all the naturally-occuring elements a chart that organizes all the elements by their atomic mass a chart that organizes all the elements created by humans 

Answers

a chart that organizes all elements by their atomic number.

Based on the diagram, which of these conclusions is correct? The frequency of Wave 1 is double the frequency of Wave 2. The frequency of Wave 2 is double the frequency of Wave 1. The wavelength of Wave 1 is four times the wavelength of Wave 2. The wavelength of Wave 2 is four times the wavelength of Wave 1.

Answers

The frequency of wave 1 is double wave 2

Answer: The frequency of Wave 2 is double the frequency of Wave 1.

Explain mass defect in terms of atomic mass number and atomic mass and explain how gamma radiation is produced.

Answers

The atomic nucleus is made up of neutrons and protons. If you measure its mass, it turns out that, it is always smaller than the sum of individuals masses of protons and neutrons that it is made of.
We call this difference a nuclear binding energy. This energy is used to hold the nucleus together. According to Einstein's famous formula:
[tex]E=mc^2[/tex]
Mass and energy are the same thing, or rather, a manifestation of the same thing. They are interchangeable. 
Some of the nucleus mass is used as energy to keep it together:
[tex]\Delta m=mc^2[/tex]
Gamma radiation is produced during gamma decay. 
When a nucleus undergoes alpha or beta decay it can be left excited. 
An excited nucleus is unstable, it has an excess energy. A nucleus that is excited emits a photon to get rid of this excess energy and we call this process gamma decay. During a gamma decay, no particles are eject from the nucleus. Gamma rays are simply photons that have very high energies.




Why was the Constitution written, according to the Preamble? A. to create a more perfect Union B. to end slavery C. to break free from Britain D. to give women the vote

Answers

Hello,

The answer is option A "to create a more perfect Union".

Reason:

The constitution was created in order to form a better Union. Its not option B because the constitution is the very first step to forming the better country slavery wasn't abolished then Its also not option C because we broke free of Britain using "taxation without representation" which helps the colonists break free from Britain. Its also not option D because the country was already before women gained there rights.

If you need anymore help feel free to ask me!

Hope this helps!

~Nonportrit

what i the difference between a wedge and an inclined plane

Answers

This is what I found! I hope this helps :)

anybody wanna help me ? 10 points !!

Answers

Hello!

The answer is D. 6 because, in a balanced atom, the number of protons is equal to the number of electrons.

I hope this helps :))
As far as we can see there are 6 electrons. Electrons are negative and protons are positive. The answer is 6 because to have a balanced charge, there needs to be an equal number of electrons and protons.

Hope this helps! Message me if you have any questions!

According to its periodic table entry, how many electrons does nitrogen have in its valence level? 2 5 7 14

Answers

It has 5 electrons.
hope it helps. :)
b) 5 

Hope this helped!

process where sediment and other material is moved from one place to another is called blank?

Answers

deposition is the movement of sediment and other materials

The Sierra Nevadas are an example of a fault-block mountain range. Based on this information, which of the following processes formed the Sierra Nevadas?

Answers

This question may require more information to provide a more accurate answer.

A fault block mountain range is formed by tension as rocks are pulled away from each other. A fault block is a section of rock bounded on at least two sides by faults.
Faults commonly break the crust into large, fault bounded blocks. If normal faults down drop one fault block relative to other blocks on either side, the resulting feature is called a Graben.
A block that is uplifted relative to blocks in either side is called a horst.

Answer:

Explanation:

The uplift caused a wide range of elevations and climates in the Sierra Nevada, which are reflected by the presence of five life zones (areas with similar plant and animal communities).


please help me i will mark beainliest
Which would be the best element to use in a semiconductor?



Question 5 options:

lithium (Li)


chlorine (Cl) )


silicon (Si)


carbon (C)




Answers

If it is an electronic application, then Silicon would be the best semiconductor . Silicon is more resistant to heat

Light from a distant star has undergone a red shift. Which of these conclusions is correct about the star? Its pitch is increasing. Its parallax is increasing. It is moving towards Earth. It is moving away from Earth.

Answers

We've never discovered any way for wavelengths of light to
appear to get longer after they leave the source, except for
the Doppler effect ... when the observer and the source of
the light are moving apart.  

Since we don't know any other way for it to happen, whenever
we see a star or a galaxy whose light is red-shifted, we conclude
that it is moving away from Earth.

If you think about this for a few seconds, there are two things
about it that should blow your mind:

#1). "Red-shifted" means that the wavelengths of the light we see
are longer than the wavelengths of the light that left the star.
How do we know what the wavelength was when it left the star ?

#2). Our whole picture of the "expanding universe" ... which is a
big part of the foundation that supports the whole picture of the
"big bang" ... rests on the red-shift of light from distant galaxies,
and our conclusion that they are all moving away from us.
If we ever discover a DIFFERENT way that light can become
red-shifted, that may be IT for the expanding universe and the
big bang, both.  They may both be out the window. 

Answer:

It is moving away from Earth.

Explanation:

As the source comes closer to the observer then we can say that its frequency will increase.

So here we know that

[tex]\frac{\Delta \nu}{\nu} = \frac{v}{c}[/tex]

here we know that

v = speed of the star

c = speed of light

now if we know that speed of the star is towards us then the frequency will increase and hence the wavelength will decrease.

So it is known as Blue shift

While if the star is moving away from us then in that case the frequency will decrease and hence the wavelength will increase.

So here it is known as Red Shift.

So here correct answer will be

It is moving away from Earth.

A boat sails along the shore. To an observer, the boat appears to move at a speed of 22 m/s, and a man on the boat walking forward appears to have a speed of 23.1 m/s. How long does it take the man to move 3 m relative to the boat?

Answers

The boat is moving at 22 m/s while the man is moving at 23.1 m/s.

That means the man, relative to the boat, is moving at 23.1-22 = 1.1 m/s.

v =d/t, so t = d/v --> t = 3/1.1 = 2.7 s

Which formula can be used to find tangential speed of an orbiting object?

Answers

According to my calculation the answer for this question would have to be the first one! 

Answer:

A) [tex]v = \frac{2\pi r}{T}[/tex]

Explanation:

As we know that the speed of the object is defined as the the ratio of total distance and total time taken

now as we know that here the distance along the path of the orbiting object is total length of the circle

so it is given as

[tex]L = 2\pi r[/tex]

also we know that

time period to complete the orbit is given as

[tex]t = T[/tex]

now the speed is given as

[tex]v = \frac{d}{t}[/tex]

[tex]v = \frac{2\pi r}{T}[/tex]

From which sphere does most water evaporate?

A. Lithosphere
B. Hydrosphere
C. Biosphere
D. Atmosphere

Answers

This would actually be known to be called "Hydrosphere". This unit is what would contain all of the water which makes the sphere does most of the evaporation.
The Answer to your question is B. Hydrosphere

What best describes the degree to which a material can transmit heat

- melting point
- boiling point
- thermal conductivity
- electrical conductivity

Answers

BOILING POINT BECAUSE BOILING POINT IS THE POINT AT WHICH A MATERIAL OR SUBSTANCE IS MADE PURE AND FOR A SUBSTANCE TO BE MADE PURE IT NEED TO ABSORB AND GIVE OUT HEAT COS BOILING REACTION IS EXOTHERMIC

The correct answer is C. Thermal conductivity

Explanation:

Conduction occurs as heat, electricity, etc. are transmitted from one body to another. In the case of thermal conductivity, this refers to the property of one material or body to transmit or conduct heat. This property is measured in Watts (energy) per meter(distance)-Kelvin (temperature). For example, the thermal conductivity of copper is around 385 while the one of ice is 1.6, which indicates copper has a higher capability to conduct heat. Thus, the degree to which a material can transmit heat is thermal conductivity.

give an example of fluid friction

Answers

Hailstones falling from the atmosphere.
Also, the drag of air on an airplane. I hope this helps.
 Static Friction 
Sliding Friction 
Rolling Friction 
Fluid Friction 



PLEASE HELP ME!

C. What organelle is missing from E. coli?

Answers

The answer is : There is no nuclear membrane. This is because there is no need for a nuclear membrane to protect a non-existent nucleus. Also, bacteria cells are prokaryotes and all prokaryotes do not contain a nucleus.

Answer:

The organelle missing from E.coli is nuclear membrane.

Explanation:

A nuclear membrane is a double membrane that surrounds and protects the nucleus of a cell. The nuclear membrane is lacking because there is no need for one to protect a nucleus that does not exist. Bacteria cells are also prokaryotes, and all prokaryotes lack a nucleus.

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what is one joule work

Answers

It's a Newton Meter Those two are multiplied to get a joule.

please do the Venn diagram

Answers

A compound is a combination of 2 or more elements. They are chemically combined at fixed proportions. The resulting compound changes the original property of the components. 

A mixture on the other hand is physically combined at variable proportions. The components retain their properties. But like compounds, they also are made up of elements and they can have more than 2 components. 

Attached is a Venn Diagram that shows their differences and similarities. 

An atom with 7 protons, 6 neutrons, and 7 electrons has an atomic mass of _____ amu. (Enter a whole number.)

Answers

It would be 13, the number of protons is equal to the atomic number. Which makes this nitrogen. You then add the protons and neutrons to make the mass
7+6=13

PLEASE HELP ME ANSWER THIS!
Which direction will the molecules pass through the cell membrane?

a. From bottom to top
b. From left to right
c. From right to left
d. From top to bottom

Answers

this is biology,
and molecules will move from left to right.
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