Answer:
When something is lifted, work is done on the object against the pull of gravity. This work is converted to a form of potential energy called gravitational potential energy. When the item falls towards Earth like an apple from a tree, gravitational potential energy is converted into kinetic energy.
The particles of a substance can have kinetic energy (KE) and potential energy (PE). Which equation best summarizes the internal energy (U) of the substance?
Answer:
The internal energy of a substance is equal to the total amount of potential energy and kinetic energy of ALL the particles in the substance.
For example, when the temperature increases (more temperature means more energy), the kinetic energy of the particles in the substance increases.
And when we reach a point near a change of phase (like near fusion point) there is energy used to break the bonds between the particles, then we have an increase in potential energy.
Then we could write the internal energy as:
U = ∑(KEₙ) + ∑(PEₙ)
Where ∑(KEₙ) and ∑(PEₙ) are the sums of the kinetic energy and potential energy of all the particles in the substance.
The equation that best summarizes the internal energy (U) of a substance that has both kinetic and potential energy is U = ∑(KEₙ) + ∑(PEₙ).
WHAT IS INTERNAL ENERGY:The internal energy of a substance is equal to the total amount of potential energy and kinetic energy of all the particles in the substance.According to this question, the particles of a substance can have kinetic energy (KE) and potential energy (PE). This means that the internal energy is the sum of the kinetic energy and potential energy of all the particles in the substance.Therefore, equation that best summarizes the internal energy (U) of a substance that has both kinetic and potential energy is U = ∑(KEₙ) + ∑(PEₙ).
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which two options are examples of wave refracting?
A. Your image in a mirror
B. Light bending as it travels through glass.
C. A voice echo.
D. An object appearing broken when partly seen through water.
Someone please help me! Please help
Answer:
Explanation:
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(Physics) Help !! I’ll give brainliest if you answer both the question in the picture and this question :
The loudness or intensity of a sound is related to its…
A. Amplitude
B. Frequency
C. Pitch
D. Wavelength
Answer:
Explanation:
i think the first questions answer is A. amplitude
the second questions answer is also A. transverse wave
Answer:
B. Frequency and transverse
Show the steps im confused.
The answer is 14 m/s
Answer:
14 m/s
Explanation:
KE=1/2mv^2
5880J= 1/2(60kg)v^2
5880J=(30)(V^2)
5880/30=V^2
196=v^2
square root of 196 is 14
Which equation should be used to calculate the speed of a wave?
speed = frequency x wavelength
speed = frequency x hertz
speed = period x wavelength
speed = period x hertz
The equation should be used to calculate the speed of a wave is speed = frequency x wavelength.
What is the formula for wave speed?The speed of a wave is calculated by the equations: V = λ . f or V = λ/T, and the unit of measurement is m/s. This speed depends on the medium: in gaseous media, the speed is lower than in solid media.
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The equation should be used to calculate the speed of a wave is speed = frequency x wavelength.
What is Speed of wave?Wave speed is the movement of a progressive wave, which is an energy-moving disturbance that takes the shape of an oscillation and moves from one place to another.
The wavelength and frequency of a wave both affect its speed. A wave's speed is a crucial factor because it enables us to estimate how quickly the wave will disperse in the medium, which is the substance or material that will carry it.
This is the water in the case of ocean waves and the air in the case of sound waves. The kind of wave and the physical properties of the medium in which it is flowing also affect a wave's velocity.
Therefore, The equation should be used to calculate the speed of a wave is speed = frequency x wavelength.
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How could you explain that two objects of the same volume have different buoyancy in water???
HELP ITS URGENT
Answer:
Explanation:
Take for example you place two eggs in the water. One starts to sink and one remains floating. They have the same volume but the one that sinks is cracked just a little, which as soon as it hits the water, water starts to go in the egg. Then that changes the volume of the egg. (I've done this expirement before) It can also be the way you place the object in the water, or one object has been in the water longer. The buoyancy can be the way they are positioned/placed in the water. One may be more absorbant to the water as well.
I hope you understand what I am trying to say.
The time for a sound wave to travel between two people is 0.80 s,
The people are 256 m apart
Calculate the speed of sound in air.
Answer:
Explanation:
Using the below formula
Speed of sound = ( distance between observers) *2/(total time taken)
Now putt the given values ,
time taken = 0.80 sec
distance = 256 m
hence
V of sound= 256*2/0.80
V of sound = 640 m/sec
A bag weighing 20 N is pushed horizontally a distance of 35 m across a
level floor by a force of 10 N, How much work is done on the bag in
Joules? W=Fd *
Answer:
350J
Explanation:
Given parameters:
Weight of bag = 20N
Distance moved horizontally = 35m
Force applied = 10N
Unknown:
Work done on the bag = ?
Solution:
Work done is the force applied to move a body through given distance.
Work done = Force applied x distance
So;
Work done = 10 x 35 = 350J
examine this diagram of the human heart. what is the structure indicated by the arrow?
I unfortunately can't post a picture because I am uploading this question from my computer but I will do my best to describe the image.
It's a normal picture of a human heart, but there is an artery going down and there is an artery going to the right, I need the name of the artery going to the right because that is what the arrow is pointing at.
A. The Pulmonary Artery
B. The Pulmonary Vein
C. The Superior Vena Cava
D. The Aorta
Answer:
Right coronary artery
Explanation:
Right coronary artery (RCA). The right coronary artery supplies blood to the right ventricle, the right atrium, and the SA (sinoatrial) and AV (atrioventricular) nodes, which regulate the heart rhythm.
Answer:
A.) Pulmonary artery
Explanation: Someone told me Aorta and i got it wrong....
1. If an object starts at 0 m/s and 0.0001 seconds later the object is travelling at
400 m/s what is the objects acceleration?
Answer:
4 x 10⁶m/s²
Explanation:
Given parameters:
Initial velocity = 0m/s
Time = 0.0001s
Final velocity = 400m/s
Unknown:
Acceleration of the object = ?
Solution:
Acceleration is the rate of change of velocity with time;
Acceleration = [tex]\frac{Final velocity - Initial velocity }{Time }[/tex]
Acceleration = [tex]\frac{400 - 0}{0.0001}[/tex] = 4 x 10⁶m/s²
Calculate the momentum of a boat with a mass of 95kg moving at 2m/Ss
Answer:
190 kg m/s
Explanation:
Momentum = Velocity × Mass
→ Substitute in values
2 × 95 = 190 kg m/s
The momentum of the boat of mass 95 Kg moving at 2 m/s will be 190 Kg m/s.
What is Momentum?Momentum is defined as the product of mass of velocity. Momentum is a vector quantity. Mathematically, we can write momentum as -
p = mv
It is also the measure of the impact force imparted by any moving object, when it comes in contact with some other body.
Given is a boat with a mass of 95 Kg moving at 2 m/s.
Mass [m] = 95 Kg
Velocity [v] = 2m/s
We can write the momentum as -
p = mv
Substituting values, we get -
Momentum [p] = 95 x 2 = 190 Kg m/s
p = 190 Kg m/s
Therefore, the momentum of the boat of mass 95 Kg moving at 2 m/s will be 190 Kg m/s.
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Find the electric field E⃗ (r⃗ )E→(r→)E_vec(r_vec) inside the sphere (for rrr< aaa) in terms of the position vector r⃗ r→r_vec. Express your answer in terms of r⃗ r→r_vec, rhorhorho (Greek letter rho), and ϵ0ϵ0epsilon_0.
Solution :
Using the Gauss law, the electric field intensity of a sphere is given by :
[tex]$E. 4 \pi r^2 = \frac{Q_{enc}}{\epsilon_0}$[/tex]
[tex]$E = \frac{Q_{enc}}{4 \pi r^2 \epsilon_0}$[/tex]
Now the enclosed charge inside the sphere (r<a) is
[tex]$Q_{enc}= \rho V$[/tex]
[tex]$Q_{enc}= \rho \left( \frac{4}{3} \pi r^3 \right)$[/tex]
Hence, the electric field intensity becomes as follows :
[tex]$E= \frac{\rho \left(\frac{4}{3} \pi r^3\right)}{4 \pi \epsilon_0 r^2}$[/tex]
[tex]$E =\frac{\rho r}{3 \epsilon_0}$[/tex]
Thus, the electric field inside the sphere is given by :
[tex]$\vec {E} = \frac{\rho \vec{r}}{3 \epsilon_0}$[/tex]
Scientists have made predictions about the universe today based on the big bang theory. Observations that match these predictions support the big bang theory. Which of the following observations have scientists made that provides evidence of the big bang?
A. Light from the moment of the big bang has been observed.
B. The percentages of hydrogen and helium match the predicted percentages.
C. Galaxies are moving toward each other as predicted by the big bang theory.
D. Many galaxies that are similar to the Milky Way have been observed.
Answer:
the answer is b
Explanation:
Answer:
b
Explanation:
I just did it on a p e x
A spring has a constant of 875 N/m. What hanging mass will cause this spring to stretch 4.5 m?
Answer:
8) A hanging 7.5 kg object stretches a spring 1.1 m. What is the spring constant? 1 . 1 66. 82 NIMO 9) A spring has a constant of 875 N/m. What hanging mass will cause this spring to stretch 4.5 m? Iouliply then divide 875 X 4. 2- - (4 04. 7919) 10) A spring with a spring constant of 25 N/m is stretched 65 cm. What was the force used? 11) A 25 N force stretches a spring 280 cm. What was the spring constant? 12) A 75 N force stretches a spring 175 cm. What was the proportionality constant? 8) 66.82 N/m 9) 401.79 kg 10) 16.25 N 11) 8.93 N/m 12) 42.86 N/m
Explanation:
A spring has a constant of 875 N/m. and the mass which will cause this spring to stretch 4.5 meters is 401.78 kg.
What is Spring constant?The spring constant is a characteristic of a spring which is defined as the ratio of the force affecting the spring to the displacement which is caused by that force. The SI unit of spring constant is N.m⁻¹ (Newton per meter).
The spring constant is:
F = -k/ x
where, k is the spring constant
F denotes the force,
and x denotes the change in the length of the spring.
k = 875N/m
x = 4.5m
We know that
Kx = mg
m= kx/ g
m = 875 × 4.5/ 9.8
m = 401.78kg
Therefore, the mass which will cause this spring to stretch 4.5 meters is 401.78 kg.
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Can a solution be separated by filtration?
Answer:
Filtration is a method for separating an insoluble solid from a liquid. When a mixture of sand and water is filtered: the sand stays behind in the filter paper (it becomes the residue ) the water passes through the filter paper (it becomes the filtrate )
Explanation:
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Need help ASAP
Thanks+ BRAINLIST only for correct answers it’s due in 10 mins I really need help
1.what is the order if visible light in increasing energy?
-violet, indigo, blue, green, yellow, orange, red
-red, orange, yellow, green, blue, indigo, violet
2.visible light is a mixture of
-refraction and reflection
-atoms and molecules
-many colors
-ultra violet and non violet rays
Explanation:
1A. The visible light portion of the electromagnetic spectrum shows the rainbow of colors, with violet and blue having shorter wavelengths, and therefore higher energy. At the other end of the spectrum toward red, the wavelengths are longer and have lower energy.
so its option 2
2A. Atom and molecules
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I had to show a screenshot of this because brainly thinks it detects a bad word
which statements describe kinetic and potential energy? check all that apply.
Answer:
ACDE
Explanation:
Energy is generally described as the ability to do work by a body. There are two main forms of energy which are the kinetic energy and the potential energy.
Other energy forms stems from these two energy types.
Potential energy expressly deals with the position of a body. It is mathematically given as:Potential energy = mass x acceleration due to gravity x height
It is the energy stored based on the position of particles within a mediumThese description satisfies options A, C
Kinetic energy is the energy due to the motion of body. It is mathematically given as:Kinetic energy = [tex]\frac{1}{2}[/tex] x mass x velocity²
Also, kinetic energy is directly proportional to the velocity of a body.The description satisfies DE
When we stretch a spring, which two factors affect how much elastic
potential energy is stored in it
3.5 x 10^-3 as a regular number (convert from scientific notation to a real number)
Answer: 0.0035
============================================
Explanation:
The exponent is -3, so we move the decimal point 3 spots to the left to go from 3.5 to 0.0035
If the exponent was positive, then we would move the decimal point to the right that amount of spaces.
What was the name of the first oil well in the UAE?
A.Murban
B.ADNOC
C.Murhabba
D.OLPEC
Answer:
B.ADNOCExplanation:
the Abu Dhabi Petroleum Company
The first commercially viable oil discovery was made at Bab in 1960. In 1962, the company was renamed the Abu Dhabi Petroleum Company. Exports began to flow from the Jebel Dhanna terminal on December 14, 1963.
Answer:
hiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii
What does the speed of air have to do with air pressure?
Detailed answer pls!!! i will give brainliest!!!!
Answer:
The air speeds up, and as it speeds up, its pressure—the force of the air pressing against the side of the object—goes down. ... This means that if the area in which the air is moving narrows or widens, then the air has to speed up or slow down to maintain a constant amount of air moving through the area.
Please give brainliest!!!!
What are two ways in which ultrasound technology produces images
According to the label, what is the estimated cost of running this air conditioner for 3,000hours if electrical energy costs 10 cents per kilowatt-hour?
a.$40
b.$19
8c.$238
d.$300
True or false: in our solar system, only the sun creates radio waves
Which is a disadvantage of storing data digitally?
A.The parts of devices that store data are unstable compared to analog storage.
B. Other people can access personal data when a virus is copied with the data.
C. Noise makes digital data unreliable when copied.
D. The quality of copies stays the same as more copies are made.
Answer:
I thinks it’s b sorry if it didn’t help
Explanation:
One of the disadvantage of storing data digitally is that, other people can access personal data when a virus is copied with the data. Hence, security of data cannot be ensured.
What is digital storing?Nowadays there are many technological ways to store our credentials and essential documents. These data can be stored in virtual space such as in computers phones like electronic gadgets.
Compared to the conventional storage methods or paper format, digital storage is easy and fast easily accessible from anywhere in any format and can be shared. These data cannot damaged as paper document.
However, the digital storing have some drawbacks. Sometimes these data goes insecure and other people can access personal data when a virus is copied with the data.
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What is the action and reaction if a person takes a step back
Answer:
action is backward and i guess reaction is sad
2. Which animal is a primary consumer in the Ethiopian Highlands?
walia ibex
tiger
black lion
prairie dog
Answer: Wallia Ibex
Explanation: Black lions and tigers are not primary consumers. However, the Wallia Ibex is a primary consumer, hope it helps :D.
Martha, a first-grade teacher, is worried that if doesn't stay In at work to grade papers her principal will think she is lazy She is also worried that if she stays late at work her partner will be angry. This of conflict is known as
Answer:
Character vs self
Explanation:
The reason is because Martha is thinking to much about the negative things and it is making her feel like she is fighting her own body for control.
how much energy must be absorbed by water with a mass of 0.5kg in order to raise the tempature from 30c to 65c
Answer:
62760J
Explanation:
Given parameters:
Mass = 0.5kg = 500g
Initial temperature = 30°C
Final temperature = 65°C
Unknown:
How much energy is absorbed by the water = ?
Solution:
To solve this problem, we use the expression below:
H = m C Δt
H = m x C x (t₂ - t₁ )
m is the mass
C is the specific heat = 4.184J/g°C
t₂ is the final temperature
t₁ is the initial temperature
So;
H = 500 x 4.184 x (65 - 30) = 62760J
