What is the difference between true intensity and relative intensity of sound?
Answers
Explanation:
The unit called decibel (dB) is used to indicate that this ratio is multiplied by 10. The sound intensity level is not the same as sound intensity—it tells you the level of the sound relative to a reference intensity rather than the actual intensity.
Related Questions
What is true about cooling down?
A.
It causes blood to pool in your feet.
B.
It is not an important part of exercising.
C.
It keeps your blood flowing evenly.
D.
It will cause you to do stiff and sore.
Answers
Answer:
C
Explanation:
because cooling down makes your blood flow through your body much easier and fatser.
Answer:
C.It keeps your blood flowing evenly.
Explanation:
Cora wants to draw a model of an atom for her project for the science fair. she wants to draw an atom that has two protons, four neutrons, and two electrons. which model is like cora’s? at the center, 2 unmarked red balls are interspersed with 4 blue balls marked with plus signs. a green cloud with 1 concentric white line surrounds the center, with 2 small green balls marked with minus signs on the white line. at the center, 4 unmarked red balls are interspersed with 2 blue balls marked with plus signs. a green cloud with 1 white line surrounds the center, with 2 small green balls marked with minus signs on the white line. at the center, 2 unmarked red balls are interspersed with 2 blue balls marked with plus signs. a green cloud with 1 white line surrounds the center, with 4 small green balls marked with minus signs on the white line. at the center, 4 unmarked red balls are interspersed with 2 blue balls marked with plus signs. a green cloud with 1 white line surrounds the center, with 4 small green balls marked with minus signs on the white line.
Answers
If Cora draws a model of an atom with two protons, four neutrons and two electrons, it will look like this; a green cloud with 1 concentric white line that surrounds the center, with2 small green balls marked with minus signs. At the center of her model, she will draw 4 unmarked red balls interspersed with 2 blue balls marked with plus signs.
The options to your question seems clustered, but if separated, I'm sure this is what it would look like;
A.) at the center, 2 unmarked red balls are interspersed with 4 blue balls marked with plus signs.
B.)a green cloud with 1 concentric white line surrounds the center, with 2 small green balls marked with minus signs on the white line. at the center, 4 unmarked red balls are interspersed with 2 blue balls marked with plus signs
C.)a green cloud with 1 white line surrounds the center, with 2 small green balls marked with minus signs on the white line. at the center, 2 unmarked red balls are interspersed with 2 blue balls marked with plus signs.
D.) a green cloud with 1 white line surrounds the center, with 4 small green balls marked with minus signs on the white line. at the center, 4 unmarked red balls are interspersed with 2 blue balls marked with plus signs.
E.)a green cloud with 1 white line surrounds the center, with 4 small green balls marked with minus signs on the white line.
When arranged like this, the answer to the question will be option B. The green cloud represents the nucleus of the model atom. The white line that surrounds the green cloud ( nucleus ) represents the orbit or shell. Therefore, the small green balls marked with minus signs are the electrons, as they are negatively charged and are found on the orbit/shell of an atom.
The unmarked red ball at the center of the model represents the neutron. Neutrons have no charge which is shown by the red balls not being marked by any sign. The blue balls marked with a plus sign are the protons since they are positively charged.
The atom Cora wants to draw contains two protons, four neutrons and two electrons, therefore her model will contain 2 small green balls marked with minus sign as the electrons, 4 unmarked red balls as the neutrons and 2 blue balls with a plus sign as the protons. Hence the answer is option B.
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plz help me with question ;-;
Answers
Answer:
C
Explanation:
A projectile is launched upward at 24° from the ground and lands 12.5 s later at the same height. Assuming no air resistance...
What is the magnitude of the launch velocity?
How far from its original position did it land?
Answers
Answer:
The magnitude of the launch velocity is 149.3 m/s
The distance is 74.65 m
Explanation:
Given that,
Angle = 24°
Time =12.5 sec
We need to calculate the magnitude of the launch velocity
Using equation of motion
\(y=-\dfrac{1}{2}gt^2+ut\)
\(y=-\dfrac{1}{2}gt^2+u\sin\theta\times t\)
Put the value in to the formula
\(0=-\dfrac{1}{2}\times9.8\times(12.5)^2+u\sin24\times12.5\)
\(u=\dfrac{765.625}{0.41\times12.5}\)
\(u=149.3\ m/s\)
We need to calculate the distance
Using formula of distance
\(x=u\cos\theta\times t\)
Put the value into the formula
\(x=149.3\cos24\times12.5\)
\(x=74.65\ m\)
Hence, The magnitude of the launch velocity is 149.3 m/s
The distance is 74.65 m
A) make a claim on how humans impact the distribution of resources by...
B) what evidence have you discovered to explain how humans impact mineral distributions?
C) what evidence have you discovered to explain how humans impact fuel reserves
Answers
(A) Humans impact the distribution of resources by altering the natural processes that govern the distribution of resources such as minerals, fuel reserves, and water.
(B) Mining is one way in which humans impact mineral distributions.
(C) Humans impact fuel reserves through the extraction and consumption of fossil fuels.
What is the humans impact the distribution of resources?Human activities such as mining, drilling, and deforestation, humans disrupt the natural balance of resources, which can lead to resource depletion or an uneven distribution of resources.
By extracting minerals from the earth, humans can deplete or alter the natural distribution of these resources.
Additionally, mining can result in the release of toxic chemicals and heavy metals into the environment, which can have detrimental effects on ecosystems and human health.
The burning of fossil fuels releases greenhouse gases, which contribute to climate change. Additionally, the extraction of fossil fuels can have negative impacts on ecosystems, including habitat destruction and water pollution.
The use of fossil fuels also contributes to geopolitical tensions and conflicts, as countries compete for access to these resources. In recent years, there has been a growing recognition of the need to transition to cleaner, renewable energy sources in order to mitigate the negative impacts of human activities on fuel reserves and the environment.
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what is reflection of light ? Which type of surface is required for a regular reflection
Answers
Answer:
MIRROR
Explanation:
Answer:
reflection of light is the bouncing back of light rats when it falls on a smooth surface or polish surface.
2. How did Isabella discover capoeira?
O Her friend was trying it.
O She saw it in a movie.
O Her father is a coach.
o It was a club offered at her school.
Answers
Answer:
she saw it in a movie
Explanation:
she said her mom and her saw it in Step up 3 and fell in love
how are zero gravity conditions created in simulated free fall
Answers
Thus, simulated freefall is a method of creating zero gravity conditions by allowing a spacecraft to travel in orbit, resulting in a constant state of freefall. During this process, the gravitational pull of the Earth and the centripetal force generated by the spacecraft’s motion are balanced, resulting in a state of weightlessness or zero gravity inside the spacecraft.
Simulated free fall is a process that is used to create zero gravity conditions in space. It is done by allowing a spacecraft to travel in an orbit, which results in a constant state of freefall. The conditions in a spacecraft during a simulated freefall are similar to those in a state of zero gravity. In simulated freefall, the spacecraft moves at a speed that allows it to remain in orbit while constantly falling towards the Earth. During this process, the gravitational pull of the Earth and the centripetal force that is generated by the spacecraft’s motion are balanced. This balance results in a state of weightlessness or zero gravity inside the spacecraft. In addition to being used for research and experimentation, simulated freefall is also used to train astronauts for spaceflight. By creating a zero gravity environment on Earth, astronauts can get a feel for what it will be like to work and live in space. They can practice tasks such as moving around and handling equipment, which are much different in zero gravity than they are on Earth.
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help = brainlist pls
Answers
Answer:
A) the liquid particals move slower
Explanation:
vapor has a higher temp and have more energy than liquid so it's not c or d. and liquid has a lower boiling point than vapor
a block of mass 2m is placed symmetrically on two identical wedges of mass m. all surfaces are frictionless. if the system is released from rest, what is the horizontal acceleration of the wedge?
Answers
The edge must also be given a force with a magnitude comparable to the mass of the block, or force = mg. Acceleration is the term that denotes how quickly acceleration changes.
What causes acceleration?
Acceleration is the rate at which the speed and direction of a moving object change over time. When a point or object accelerates but then slows down again, it is still moving ahead.
Why does time speed up?
A net force changes an item's momentum; the greater the net force, the more acceleration the object feels. Positive net strengths are required in order to advance in the same proportion the less galaxy clusters.
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a magnet is moved through a coil of wire
Answers
As long as the magnet is moving ...
... there is voltage between the ends of the wire in the coil, and
... if there is any kind of conductor between the ends, then there is current flowing through the coil.
why energy crisis may create big problem in the near future.
Answers
Answer:
Most energy crises have been caused by localized shortages, wars and market manipulation. Some have argued that government actions like tax hikes, nationalisation of energy companies, and regulation of the energy sector, shift supply and demand of energy away from its economic equilibrium.
In the system shown above, the pulley is a uniform disk with a mass of .75 kg and a radius of 6.5 cm. The coefficient of friction between the 5.8 kg mass and the horizontal surface is .25, and the ropes does not slip on the pulley. They system is released from rest. Use work-energy principles to determine the kinetic energy of the (a) 2.8 kg mass and (b) the pulley after the 5.8 kg mass has moved 2.2 meters.
Answers
Answer:
i am answering the same question 3rd time
please find the answer in the images attached.
what is the minimum power that the engine of a 560kg car has to deliver to accelerate the car from rest to 100km/he in 6.0second
Answers
Answer:
what is the minimum power that the engine of a 560kg has to deliver to accelerate the car from the rest to 100 kilometers/he in 6.0 seconds per feet
Explanation:
the car's weight kilometeresseconds the car is going acceleration of the speed it is going at ofWhich value is NOT equivalent to the others?
Multiple choice question.
A)
5 × 1011 nm
B)
0.5 km
C)
500 m
D)
5000 cm
Answers
Answer:
A) 5 × 1011nm
I think It's A
If a rock is thrown upward on the planet Mars with a velocity of 10 m/s, its height in meters t seconds later is given by y=10t−1.86t2. (a) Find the average velocity over the given time intervals: (i) [1,2] (ii) [1,1.5] (iii) [1,1.1] (iv) [1,1.01] (v) [1,1.001] (b) Estimate the instantaneous velocity when t=1.
Answers
To find the average velocity over the given time intervals, we can use the formula:
Average velocity = (change in position) / (change in time)
(a)
(i) [1,2]:
Change in position = y(2) - y(1) = 10(2) - 1.86(2^2) - (10(1) - 1.86(1^2)) = 20 - 7.44 - 10 + 1.86 = 4.42Change in time = 2 - 1 = 1Average velocity = (4.42) / (1) = 4.42 m/s(ii) [1,1.5]:
Change in position = y(1.5) - y(1) = 10(1.5) - 1.86(1.5^2) - (10(1) - 1.86(1^2)) = 15 - 4.185 - 10 + 1.86 = 2.675Change in time = 1.5 - 1 = 0.5Average velocity = (2.675) / (0.5) = 5.35 m/s(iii) [1,1.1]:
Change in position = y(1.1) - y(1) = 10(1.1) - 1.86(1.1^2) - (10(1) - 1.86(1^2)) = 11 - 2.046 - 10 + 1.86 = 0.814Change in time = 1.1 - 1 = 0.1Average velocity = (0.814) / (0.1) = 8.14 m/s(iv) [1,1.01]:
Change in position = y(1.01) - y(1) = 10(1.01) - 1.86(1.01^2) - (10(1) - 1.86(1^2)) = 10.1 - 1.8686 - 10 + 1.86 = -0.0086Change in time = 1.01 - 1 = 0.01Average velocity = (-0.0086) / (0.01) = -0.86 m/s(v) [1,1.001]:
Change in position = y(1.001) - y(1) = 10(1.001) - 1.86(1.001^2) - (10(1) - 1.86(1^2)) = 10.01 - 1.86006 - 10 + 1.86 = -0.00006Change in time = 1.001 - 1 = 0.001Average velocity = (-0.00006) / (0.001) = -0.06 m/s(b) To estimate the instantaneous velocity when t=1, we can find the derivative of the position function with respect to time and evaluate it at t=1.
y(t) = 10t - 1.86t^2y'(t) = 10 - 3.72tInstantaneous velocity at t=1: y'(1) = 10 - 3.72(1) = 6.28 m/s
About VelocityVelocity is a vector quantity that indicates how fast an object is moving. The magnitude of this vector is called speed and is expressed in meters per second.
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what type of image of the object will the convex mirror create? a virtual image behind the mirror. a real image in front of the mirror.
Answers
A convex mirror is a spherical mirror that curves outward, away from the observer. When an object is placed in front of a convex mirror, the image created is a virtual image behind the mirror.
The image formed is always smaller than the actual object size. The image formed by a convex mirror is always virtual and smaller than the actual object size.In a convex mirror, the reflection of the image is formed when the light rays diverge outwards, creating a virtual image behind the mirror. The image formed is always smaller than the actual object size. The image formed by a convex mirror is always virtual and smaller than the actual object size. It does not have a real image. In general, a virtual image is one that is not formed by the actual intersection of light rays but appears to be the result of their intersection by projection.
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A ball is thrown straight up 25 m/s, if it lands 10 seconds later, how high is the building?
Answers
Answer:
Explanation:
To determine the height of the building, we can use the kinematic equation for vertical motion:
h = v₀t + (1/2)gt²
Where:
h is the height of the building
v₀ is the initial velocity of the ball (25 m/s)
t is the time taken for the ball to reach the ground (10 seconds)
g is the acceleration due to gravity (approximately 9.8 m/s²)
Plugging in the values:
h = (25 m/s)(10 s) + (1/2)(9.8 m/s²)(10 s)²
h = 250 m + (1/2)(9.8 m/s²)(100 s²)
h = 250 m + 490 m
h = 740 m
Therefore, the height of the building is approximately 740 meters.
Hope it helps!! :))
What happens to the sound an object makes when the speed of vibrtions decreases (slowdown?)
Answers
Answer:
the volume increase
Explanation:
because because when the speed of the vibrations decrease the speech of the sounds become loud
When an air rocket is fired vertically into the air, where is the velocity the greatest? Where is the rockets velocity zero? What is the acceleration of the rocket during its flight?
Answers
Given that an air rocket is fired vertically into the air, lets solve for the following:
(b), At the highest height, the velocity of the rocket will be zero
The rocket's velocity will be zero when it gets to its highest height.
(c) The acceleration of the rocket during its flight will be the negative of the acceleration due to gravity.
This is because, as the rocket goes up, the force of gravity acts on the rocket.
Therefore, the acceleration of the rocket is -9.8 m/s².
ANSWER:
(b) The velocity is zero when it get's to its highest point.
(c) -9.8 m/s²
What is called the process of finding exact quantity of a substance?
Answers
Answer:
Measurement is called the process of finding exact quantity of a substances.
Nick carries out an experiment in which he swings a rubber bung around his head on a string. Name the force that causes the centripetal force in this experiment
Answers
When he swings a rubber bung around his head on a string, the centripetal force is caused by the tension in the string.
What is centripetal force?When an object travels in circular path, a force which makes an object to continue to move in circular motion is the centripetal force which is directed towards the center of the path.
Thus, When he swings a rubber bung around his head on a string, the tension force is developed in the string which is in turn balanced by the centripetal force.
Thus, the centripetal force is caused by the tension in the string.
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Help plz..,, due tommorow
Answers
Force = 20 Newton’s
Acceleration = 5.0 m/s^2
20 N = M * 5 m/s^2
M = 4 kg
Solution: mass is 4 kg
Which diagram represents the postulate that states exactly one line exists between any two points?
B
Intro
#/108 core leam edgenuit
A
B
B
0000
A
B
Done
Answers
Answer:
A.BB is 000 with A.B is 0.00
consider a steam engine whose working fluid always stays within the quality range of 0.0 to 1.0. the system operates between the pressure limits of 6.8 mpa and 1.21 mpa. if heat is supplied to the engine at a rate of 250 kw, what is the maximum power that could be produced by the engine?
Answers
The maximum power that could be produced by the steam engine is approximately 88.2 kW. The maximum power that could be produced by the steam engine can be calculated using the thermodynamic equation for the efficiency of a Carnot cycle, which is given by:
η = (T₁ - T₂) / T₁
where η is the efficiency, T₁ is the temperature of the heat source, and T₂ is the temperature of the heat sink. In this case, the heat source temperature is unknown, but we can find it using the saturation temperature at the pressure of 6.8 MPa, which is approximately 364°C. Similarly, the temperature at the heat sink pressure of 1.21 MPa is approximately 191°C.
Using the efficiency equation and the given heat input rate of 250 kW, we can calculate the maximum power output of the steam engine as:
P max = η * Qin
where P max is the maximum power output and Qin is the heat input rate. Plugging in the values, we get:
P max = η * 250 kW = (364 - 191) / 364 * 250 kW ≈ 88.2 kW
Therefore, the maximum power that could be produced by the steam engine is approximately 88.2 kW.
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regarding the oscilloscope and based on the information provided in the laboratory manual. what axis measures the voltage strength, the x-axis or the y-axis?
Answers
pertaining to the oscilloscope and in accordance with the details in the laboratory manual. what axis quantifies the voltage intensity? Voltage (on the vertical axis) versus time is plotted on the oscilloscope's graph (on the horizontal axis).
What is meant by a Oscilloscope?An oscilloscope is a class of electronic test equipment that graphically shows changing electrical voltages as a two-dimensional plot of one or more signals as a function of time.
The major goals are to show on the screen waveforms that are repeating or singular and would otherwise occur too quickly for the human eye to see. The waveform that is being presented can then be examined for characteristics like amplitude, frequency, rising time, time interval, distortion, and others.
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About how long does it take Earth to complete one revolution around the Sun?
1 year
14 days
24 hours
27.3 days
Answers
Answer:
1 year = 365 days
because Earth Revolution is the movement of the Earth around the Sun
The earth takes 1 year or 365 days to complete one revolution around the sun. Thus option A is correct.
What is the rotation and revolution of Earth?Rotation and revolution refer to the circular motion of the objects. Rotation is defined as the circular motion of the object about its own axis whereas revolution refers to the circular motion around the other object.
The Earth rotates around its own axis which is called Earth's rotation. The Earth takes 24 hours to rotate on its own axis and the Earth's rotation causes day and night on Earth.
The earth revolves around the Sun which is called Earth's revolution. The Earth takes 365 days to complete one revolution around the Sun and the 365 days is calculated as 1 year. The full revolution of Earth is responsible for climate and seasonal change.
Combined spinning and revolution of Earth lead to changes in daily weather and global climate conditions by affecting wind directions, temperature, and ocean currents, etc.
Thus the Earth takes 1 year to complete one revolution around the Sun. Hence, the ideal solution is Option A.
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A compounded reverted gear train is to be designed as a step up gear to increase the speed by 48 times. With pressure angle of 20
∘
, specify suitable numbers of teeth to minimize gearbox size and avoid interference problem in the teeth. Sketch the designed compounded reverted gear system, indicating the gear positions and their numbers of teeth.
Answers
The first gear set (12-72) provides a speed increase of 6, and the second gear set (8-64) further increases the speed by a factor of 8, resulting in an overall speed increase of 48.
To design a compounded reverted gear train as a step-up gear with a speed increase of 48 times while minimizing the gearbox size and avoiding interference problems, we need to carefully select the numbers of teeth for the gears.
The compounded reverted gear train consists of two sets of gears: the first set is the compound gear train, and the second set is the reverted gear train. The compound gear train is used to achieve a moderate speed increase, and the reverted gear train further amplifies the speed.
To determine suitable numbers of teeth, we can start by considering the speed increase ratio of 48. This ratio can be achieved by breaking it down into smaller ratios for the compound and reverted gear sets. For example, we can choose a speed increase ratio of 6 in the compound gear train and a ratio of 8 in the reverted gear train.
Next, we need to select suitable numbers of teeth for each gear to avoid interference problems and ensure smooth operation. To minimize gearbox size, we aim to keep the gears as small as possible. One approach is to use gears with a small number of teeth, which can help reduce their size.
For the compound gear train, we can select gears with, for example, 12 and 72 teeth. This gives a speed increase ratio of 6. For the reverted gear train, we can choose gears with 8 and 64 teeth, resulting in a speed increase ratio of 8.
The sketch of the designed compounded reverted gear system would show the gear positions and their numbers of teeth as follows:
---- 12 teeth ----
/ \
--- 72 teeth 8 teeth ---
\ /
---- 64 teeth ----
In this configuration, the first gear set (12-72) provides a speed increase of 6, and the second gear set (8-64) further increases the speed by a factor of 8, resulting in an overall speed increase of 48. By carefully selecting the numbers of teeth and the gear ratios, we can achieve the desired speed increase while minimizing the size of the gearbox and avoiding interference problems between the gear teeth.
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Who believe in astrology?
Answers
a car accelerates along a straight road from rest to 75km/h in 5.0s. What is the magnitude of its average acceleration? show up solutions
Answers
Answer:
4.186 m/s^2
Explanation:
First, convert km/hr to m/s:
(75 km/hr)(1000m/1km)(1hr/60min)(1min/60s) = 20.83 m/s
Then, divide 20.93 m/s by 5.0s
(20.93 m/s) / (5.0s) = 4.186 m/s^2