Answer:
plaster............
Explanation:
1.) An echo can be heard only if the person is in the range of both the sound waves coming directly from the source and the reflected waves and at a distance of more than 16.6 meters in front of the reflecting source.
2.) A person behind the reflecting source will likely not hear an echo. If the interval of time between the instant a sound wave reaches the ear and the instant the reflected wave reaches the ear is less than 0.1 second, the person can’t hear the echo separately from the original sound. Finally, the person can’t be too close to the reflecting surface.
3.) Clay tile would be the least efficient because it has the lowest coefficient of absorption (3%). This means that the energy remaining in a reflected wave is 97%, which is very high. (Remember that this is equal to 100 minus the coefficient of absorption). Very little of the sound energy would be absorbed.
4.) Infrasonic and ultrasonic vibrations can’t be heard by humans because they’re outside of the range of frequencies that can be detected. Infrasonic vibrations have a lower frequency than can be heard by the human ear; ultrasonic vibrations have a higher frequency than can be heard by the human ear. Infrasonic vibrations can be felt if the amplitude is great enough. Ultrasonic vibrations are utilized in sonar equipment and in applications to detect flaws in steel castings and to remove grease or foreign material from machine-part surfaces.
5.) If the sound comes from the right side, the waves reach the right ear before the left ear. If the sound comes from the left side, the waves reach the left ear before the right ear. The difference between the phases of waves reaching both ears is detected by the ears and then interpreted by the brain. If the sound comes from directly above, directly below, directly ahead, or directly behind, the sound waves reach both ears in phase and is interpreted as such by the brain.
Explanation:
PF :)
How many ohms of resistance must be present in a circuit that has 240 volts and a current of 15 amps?
ОА.
3,600 ohms
О В.
16 ohms
230 ohms
D. 0.063 ohms
Answer:
16 ohms
Explanation:
V= I ⋅ R
where, V is the net potential difference in the circuit, I is the current in the circuit and R is the net resistance of the circuit.
In this case, V = 240 volts, I = 15 amperes.
240 = 15 ⋅ R
⇒ R = 240/ 15 = 16 ohms
Answer:
b-16ohms
Explanation:
If you are using online learning/PLATO the answer is proven to be B-16 ohms
As your bike coasts downhill, your speed goes from 2 m/s to 4 m/s in 0.5 seconds. What is your acceleration?
A. 4 m/s
B. 1 m/s
C. 2 m/s
D. 8 m/s
Answer:
A.4m/s
Explanation:
(4m/s-2m/s)÷0.5s
=2m/s÷0.5s
=4m/s
Why do nitrogen molecules have triple bonds, whereas oxygen molecules have double bonds? How many valence electrons does each atom have, and how does that affect the type of bond formed in each molecule? Draw Lewis dot diagrams to support your answer.
Explanation:
Two covalent bonds form between the two oxygen atoms because oxygen requires two shared electrons to fill its outermost shell. Nitrogen atoms will form three covalent bonds (also called triple covalent) between two atoms of nitrogen because each nitrogen atom needs three electrons to fill its outermost shell.
Plz mark me as the Brainleist.. (not forcing u.. if u like the answer) amd don't forget to tell me what is "Lewis dot diagrams "??
Look at the simple machine shown below and determine the mechanical advantage.
A. 1.4
B. 0.2
C. 3.0
D. 4.9
Answer:a mechanical standpoint can be applied once more context is provided
Explanation:
An airplane with a total mass of 850 kg has an engine malfunction, causing it
to provide a constant horizontal force of 4000 N. The pilot, who has a mass
of 80 kg, decides to eject from the airplane. With the reduced total mass,
what is the new approximate acceleration of the airplane?
A. 3.1 m/s2
B. 5.2 m/s2
C. 2.8 m/s2
D. 3.7 m/s2
Answer:
B
Explanation:
If the pilot, who has a mass of 80 kg, decides to eject from the airplane. With the reduced total mass,then the new approximate acceleration of the airplane will be 5.2 m/s²
What is Newton's second law?
Newton's Second Law states that The resultant force acting on an object is proportional to the rate of change of momentum.
The mathematical expression for Newton's second law is as follows
F = m*a
where F represents the force applied
m is the mass of the object
a is the acceleration of the object
The initial acceleration of an airplane with a total mass of 850 kg has an engine malfunction, causing it to provide a constant horizontal force of 4000 N.
F =m*a
4000 N = 850×a
a= 4.7 m/s²
An acceleration of airplane when the pilot, who has a mass of 80 kg, decides to eject from the airplane. With the reduced total mass,
the horizontal force is the same 4000 N, now the total reduced mass the airplane is 770 kg
F =m*a
4000 =770×a
a = 5.2 m/s²
Learn more about Newton's second law, here
brainly.com/question/13447525
#SPJ2
Generally, branch- circuit conductors shall have an ampacity sufficient for the loads served and shall be or large? A. 22AWG B. 4 AWG C. 24 AWG D. 14 AWG
Answer:
D. 14 AWG
Explanation:
Ampacity is defined as the maximum current carry by a conductor without increasing the temperature rating.
All branch circuit conductors shall have an ampacity of at least 14 AWG.
That is why 14 AWG electric wire is a stranded copper wire widely used in circuits.
Hence, the correct option is D. 14 AWG.
Why do atoms bond? Describe examples of the two ways elements complete their valence
shell through bonding
Answer: kindly see Explanation
Explanation:
Atoms bond in other to achieve a stable valence electron shell. Through bonding, atoms with incomplete valency in the outer shell may accept, lose or share electrons with another atom in other to achieve a stable outer shell or configuration.
Ionic bonding:
Ionic or electrovalent bonding simply occurs when atoms accept or lose electrons in their outer shell in other to achieve stability. Elements that require 1 atom to achieve stability accepts from elements which requires losing 1 atom in other to achieve a stable outer shell.
Example is Sodium chloride (NaCl) sodium loses one atom, which chlorine accepts and both achieve a stable outer shell.
Covalent bonding simply refers to electron sharing between atoms. Instead of losing or accepting, the atoms bond by sharing electron to achieve stability. Such is the bonding between Hydrogen and Oxygen in the formation of H2O, oxygen requires two electrons to attain stability, each hydrogen atom requires one each to attain stability, through sharing oxygen attains two more electrons, one each from the hygrogen atoms and the oxygen atom also shares one electron with each hydrogen atom. Then all the atoms atoms stability.
Answer:
1.) Atoms bond in order to gain more stability.
2.) They can complete their valence by sharing (taking and giving) electrons for 1.)
Explanation:
Hope This Helps
beats are the resultant of
a toy airplane is flying at a speed of 8 m/s with an acceleration of 0.9 m/s^2. How fast is it flying after 2 seconds? A)9.8 m/s B)8.1 m/s C)5.2 m/s D)3.6 m/s
Answer:
A) 9.8m/s this answer is correct.
The acceleration is increasing by 0.9m/s^2 .
so, in each second it will increase by 0.9m/s^2.
Therefore, in 2 second
0.9 * 2
= 1.8m/s
Now,
8 + 1.8
= 9.8m/s
what is the value of Vo in the
diagram if maximum height attained by the object is 45m? take g = 10m/s²
Answer:
ggggg72873832737
Explanation:
What is the purpose of putting dimples on the surface of materials?
Answer:
Dimples help the golf ball convert spin into lift.
But it was quite an accident that this effect was discovered.
Explanation:
Please i need a Brainliest.
Answer: It depends on the material and its purpose.
Explanation:
at a surface level question, I would assume for the most part, less area available for friction.
What is the acceleration of an object in free fall near Earth's surface?
A. 4.9 m/s2
B. 1 m/s2
C. 0.98 m/s2
D. 9.8 m/s2
Answer:
D 9.8 m/s^2
Explanation:
The force of gravitational gravity on earth is 9.8 m/s^2
Look at the four graphs showing position versus time. Which graph describes
an object with a constant velocity?
A. Graph D
B. Graph B
C. Graph C
D. Graph A
The flat delta as shown in option C shows a situation of a constant velocity.
What is a velocity time graph?A velocity time graph is a graph that shows the velocity of an object plotted against the time. The slope of this graph is regarded as the acceleration.
Looking at the graphs as shown, we can notice that option C is a delta. This delta is the option that implies that velocity is not changing with time (constant velocity).
Learn more about velocity: https://brainly.com/question/12786977
#SPJ2
A girl runs up the down escalator in the mall. If the escalator is moving with a
velocity of 24 m/min and the girl is running with a velocity of 30 m/min, how far up the escalator can she go in 4 minutes?
A. 10 m
B. 30 m
C. 48 m
D. 24 m
Answer:
D. 24 m
Explanation:
Running up - velocity + 30 m/min
Escalator 's moving down velocity - 24 m/min
Sum velocity (30 - 24) = 6 m/min
6 m/min * 4 min = 24 m
What is the negative outcome of consolidation from many slaughterhouses across the US to only 13? A less greenhouse gas emissions B greater profits for agricultural corporations C less cost for farmers D greater possibility of contamination of our food
Answer:
D greater possibility of contamination of our food
Explanation:
Slaughterhouses are the places where animals are slaughter to supply food and when these places are consolidated, the few ones that remain receive a higher amount of animals and the meat from those animals can be combined in a batch which increases the chance of it to get contaminated. According to that, the answer is that the negative outcome of consolidation from many slaughterhouses across the US to only 13 is greater possibility of contamination of our food.
The other options are not right because they would be considered positive outcomes.
nl
AL
A beaker contained 20 mL
of water. When a marble
was added, the water level
rose to 30 mL. Using the
volume of displacement,
what is the volume of the
marble?
L
L
Answer:
10 mL= 0.01 L
Explanation:
V(water) = 20 mL
V(water + a marble) = 30 mL
V(marble) = V(water + a marble) - V(water) = 30 mL - 20 mL = 10 mL= 0.01 L
Do you believe the right to property is a natural right? Why or why not?
What is the tendency of a material to oppose the flow of charge?
I think the answer is Resistance. If the link i posted int he comment is right.
"We the people of the United States, in order to form a more perfect union, establish justice, insure domestic tranquility, provide for the common defense, promote the general welfare, and secure the blessings of liberty to ourselves and our posterity, do ordain and establish this Constitution for the United States of America." - The United States Constitution According to the Preamble, which action would be allowed by The Constitution?"We the people of the United States, in order to form a more perfect union, establish justice, insure domestic tranquility, provide for the common defense, promote the general welfare, and secure the blessings of liberty to ourselves and our posterity, do ordain and establish this Constitution for the United States of America." - The United States Constitution According to the Preamble, which action would be allowed by The Constitution? A) helping businesses pay their workers less B) giving Congress the power to create courts C) granting government the power to seize people's property D) securing the rights of the wealthy over the rights of the poor
The correct answer is B) Giving Congress the power to create courts
Explanation:
One of the principles the Constitution mentions in the preamble is Justice, this is mentioned in "We the people of the United States, in order to form a more perfect union, establish justice..." According to this, a priority is to make the country have justice, which is possible through courts, laws, among others. In this context, the action that would be allowed is "Giving Congress the power to create courts" because this might ensure the justice principle is applied in the U.S.
What would happen to a satellite if its orbit speed was reduced by half?
PLEASE ANSWER QUICKLY
Answer:
The radius of orbit will increase by 4, the satellite will move away from the Earth
Explanation:
The orbital speed of any body revolving in an orbit around another boyd is given by:
v (orbital) = √(G · M(central body)/R)
Where G is the gravitation constant.
If the body, e.g satellite is moving around the Earth, then the mass of central body M will also be a constant. Therefore, the only thing on which the orbital velocity will depend on will be Radius of the orbit R.
v ∝ 1/√R
√R ∝ 1/v
Take square:
R ∝ 1/v²
If the velocity of satellite is reduce to half, then:
R' ∝ 1/ (v/2)²
R' ∝ 1/(v²/4)
R' ∝ (4)(1/v²)
R' ∝ (4)(R)
The radius of orbit will increase by 4, the satellite will move away from the Earth
You push a cart with mass 15 kg forward , giving it an acceleration of 3 m/s ^ 2 . How much force did you apply ? O A. 0.2N O B. O 18N O D. 45 N
Answer: force = mass x accelegation
Explanation: 15x3 = 45 N
Answer:
A
Explanation:
Why don't you feel the pressure exerted by the atmosphere?
Answer:
the air within our bodies (in our lungs and stomachs, for example) is exerting the same pressure outwards so there's no pressure difference and no need for us to exert any effort.
Explanation:
Because in our body blood also exerts pressure that's why we don't feel atmospheric pressure.
A light-year is about: 6 million miles 6 million kilometers 6 billion miles 6 trillion miles
Answer: 6 trillion miles
Explanation: 1 light-year = 6 trillion miles
Place each description in the correct category.
represented by symbols
Elements
Compounds
made of one type of atom
represented by formulas
cannot be broken down
can be chemically broken down
made of two or more types of atoms
Answer:
answer in photo:
Explanation:
Elements:
They are represented by symbols.They are made of one type of atom.They cannot be broken down.Compounds:
They are represented by formulas.They can be chemically broken down. They are made of two or more types of atoms.A chemical element can be defined as a pure substance that is represented by a symbol and it comprises one type of atom that has the same atomic number (number of protons) in its nuclei.
Basically, a chemical element is a pure substance that can't be broken down, decomposed or transformed into simpler substances by chemical or physical means.
In Chemistry, some examples of a chemical element include the following:
Carbon (C). Oxygen (O). Hydrogen (H).A chemical compound can be defined as a substance that is represented by a formula and it contains two or more types of atoms, which can be chemically broken down.
Some examples of a chemical compound are:
Carbon dioxide ([tex]C0_2[/tex]).Hydrogen sulfide ([tex]H_2S[/tex]).Sodium chloride (NaCl).Find more information: https://brainly.com/question/18214726
Select the correct answer from each drop-down menu.
William finds a piece of pure iron in his garden. After a few days, the iron begins to rust. What are the two types of substances involved in the rusting process of iron?
Iron is with one kind of atom that combines with oxygen from the air to form rust (iron oxide). Rust contains two types of atoms, which means it is .
Answer:
A compound
Explanation:
Compounds are made of two or more atoms of different elements, such as water (H2O) and methane (CH4). Atoms are not drawn to scale. Molecules of compounds have atoms of two or more different elements. For example, water (H2O) has three atoms, two hydrogen (H) atoms and one oxygen (O) atom.
What would happen to a satellite if its orbit speed doubled?
Answer:
The radius of orbit will decrease by 1/4, the satellite will come closer to Earth
Explanation:
The orbital speed of any body revolving in an orbit around another boyd is given by:
v (orbital) = √(G · M(central body)/R)
Where G is the gravitation constant.
If the body, e.g satellite is moving around the Earth, then the mass of central body M will also be a constant. Therefore, the only thing on which the orbital velocity will depend on will be Radius of the orbit R.
v ∝ 1/√R
√R ∝ 1/v
Take square:
R ∝ 1/v²
If the velocity of satellite will doubles, then:
R' ∝ 1/ (2v)²
R' ∝ 1/4v²
R' ∝ (1/4)(1/v²)
R' ∝ (1/4)(R)
The radius of orbit will decrease by 1/4, the satellite will come closer to Earth
In much the same way, the sun warms you by radiation on a clear day. The space between the sun and Earth has no air to transfer thermal energy. Radiation is the transfer of energy by waves moving through space. Heat lamps used in restaurants are a familiar example of radiation.
Answer:
What's the question?
Explanation:
If each washer has a mass of 4.9 g, then the mass of two washers in kilograms would be Given that F = ma, and if 4 washers are attached to the string and car instead of 2, then the applied force on the car will be
Given that,
Mass of each washer = 4.9 g
We need to calculate the mass of two washers in kg
Using conversion of unit
Mass of each washer [tex]m= 4.9\times10^{-3}\ Kg[/tex]
So, Mass of two washers is
[tex]M=2\times m[/tex]
Put the value of m
[tex]M=2\times4.9\times10^{-3}\ k[/tex]
[tex]M=0.0098\ Kg[/tex]
If 4 washer are attached to the spring
We need to calculate the applied force on the car
Using formula of force
[tex]F=mg[/tex]
Put the value into the formula
[tex]F=4\times4.9\times10^{-3}\times9.8[/tex]
[tex]F=0.192\ N[/tex]
Hence, (i), The mass of two washers is 0.0098 kg.
(ii). The applied force on the car is 0.192 N.
Answer:
i just did it
Explanation:
A TV has a power of 130 watts and an efficiency of 80 percent. How much
power is wasted as heat?
A. 104.0 W
B. 1.6 W
C. 26.0 W
D. 6.5 W
Answer:
I think A. 104.0 W is wasted add heat.
Explanation:
130 W x 80% = 130 W x 0.8
= 104.0 W
A person on a merry-go-round is constantly accelerating away from the center?
true or false
That statement is false. It's exactly the opposite direction.
In circular motion, the "centripetal" force ... and therefore the centripetal acceleration ... points TOWARD the center.
Answer:
False
Explanation:
Took The Quiz