The reflecting wave flips upside-down on a stretched string when the wave moves from a less dense part of the rope moves toward a boundary that has a higher density. Hence the correct answer is (Option E).
What is a Reflecting Wave?A reflecting wave is a wave that abruptly changes its propagation direction when it hits the boundary between two media.
An echo is a real-world example of a reflecting wave.
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The picture shows volcanoes and a trench that form where plates move toward each other.
1. This type of boundary is called_______
2. The area where one plate moves under another is called ______
1. This type of boundary is called convergent
2. The area where one plate moves under another is called the subduction zone.
Hope that helps!
4. The work output is 500 joules for a machine that is 12.5 percent efficient. The work input is
joules. 0
(1 Point)
A.4000
B.1.000
C.2,000
D.12.500
Answer:
4000 J
Explanation:
x * .125 = 500
x = work input = 500 / .125 = 4000 J
Radiant energy, capable of traveling through space is called.
Answer:
Electromagnetic Radiation
Explanation:
Which of these diagrams is a convex mirror? A vertical rectangular box with a left side that bows out. A vertical rectangular box. A vertical rectangular box with a left side that bows in.
A vertical rectangular box with a left side that bows out is a convex mirror. A convex mirror reflects light outwards, it cannot be utilized to concentrate light.
What is a convex mirror?
A convex mirror, also known as a curved mirror, has a reflecting surface that bulges toward the light source. A curved mirror's surface can be convex, or bulging outward, or concave, or bulging inward.
A convex mirror is a hollow spherical is divided into pieces, the exterior surface of each cut portion is painted. The image of the plant has real, inverted, and smaller characteristics.
A vertical rectangular box with a left side that bows out is a convex mirror. A convex mirror reflects light outwards, it cannot be utilized to concentrate light.
Hence, option A is correct.
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Answer:
the answer is a
Explanation:
The chemical combination of atom a and atom b would result in
Answer:
A molecule
Explanation:
What is average velocity?
Answer:
amount of displacement divided by the time the displacement occurs
Explanation:
Best answer of those given
Which of the following is a component of all galaxies?
A. Objects that contain dust and gas
B. Objects that orbit the stars
C. Objects that orbit the sun
D. Objects that shine in the sky
Answer:
Objects that orbit the sun
Explanation:
Answer: A. Objects that contain dust and gas
Explanation: All galaxies have dust and gas. Answer C is incorrect because the answer says "the sun" how would and how would multiple galaxies have objects that orbit our sun?
(Oh, btw it's C I'm just messing with you guys)
It's a frightening idea, but what would be the sound intensity level of 100 physics professors talking simultaneously
The sound intensity level of 100 physics professors talking simultaneously is equal to 72 decibel.
Given the following data:
Sound intensity = 52 dB.What is sound intensity?Sound intensity can be defined as a measure of the power of a sound wave per unit area. Thus, sound intensity is a quantity that can be used to measure the energy of sound and its unit of measurement is Watts per square meter.
How to calculate the sound intensity level.Mathematically, sound intensity level is given by this formula:
[tex]\beta = 10 log(\frac{I}{I_{ref}} )[/tex]
Note: The reference value of sound intensity is equal to [tex]1.0 \times 10^{-12}\;W/m^2[/tex]
Thus, the sound intensity for one (1) professor is given by:
[tex]I_1 = 1.0 \times 10^{-12} \times 10^{5.2}\\\\I_1=1.585 \times 10^{-7}\;W/m^2[/tex]
For 100 professors, the sound intensity is:
[tex]I_{100} = 1.585 \times 10^{-7} \times 100\\\\I_{100}=1.585 \times 10^{-5}\;W/m^2[/tex]
Substituting the parameters into the formula, we have;
[tex]\beta = 10 log(\frac{1.585 \times 10^{-5}}{1.0 \times 10^{-12}})\\\\\beta = 10 log(15.58 \times 10^{6})\\\\\beta = 10 \times 7.2\\\\\beta =72\;dB[/tex]
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Complete Question:
One physics professor talking produces a sound intensity level of 52 dB. It's a frightening idea, but what would be the sound intensity level of 100 physics professors talking simultaneously?
Answer:
72dB
Explanation:
The sound intensity level of one prof is given, that's your β1 (which is equal to 52dB).
Using the sound intensity level formula:
β1= 10log ([tex]\frac{I}{I_{o} }[/tex]) = 52 dB
*This will be useful later on [even if β1 is known]
Set up the formula for β2 (β2 is going to be the new sound intensity, the one for the 100 profs):
β2 = 10 log( [tex]\frac{ 100 I}{I_{o} }[/tex] )
*You need to multiply the intensity of one professor by 100 (because now there's more)
*do some algebra- pull out the 100
β2 = 10 log (100 [tex]\frac{I}{I_{o} }[/tex])
*use log laws
β2 = 10 ( log(100) + log ([tex]\frac{I}{I_{o} }[/tex]) )
*Now, isn't there a familiar part? Well, yes! The expression for β1!
β2 = 10log(100) + β1
β2 = 10log(100) + 52dB
*use your calculator
β2 = 73dB
^^^ that's your new sound intensity level
What happens to Earth’s surface when horizontal pressure is applied to rocks?
Answer:
They fold to create ridges and valleys perpendicular to the direction to which pressure is applied.
To clean the floor, David exerts a 40 N force on a broom handle to push it 2 m, what is the work done by David on the broom?
Answer:
80Nm
Explanation:
work done = force x distance
force= 40N, distance = 2m
work done= 40 x 2 = 80Nm
Determine if the data are qualitative or quantitative.
Answer:
Qualitative, Quantitative, Qualitative, Quantitative, and Qualitative.
Explanation:
[tex]\qquad\qquad\huge\underline{{\sf Answer}}♨[/tex]
Here we go ~
❖ Qualitative data determines the property or characteristics of certain object or behavior.
❖ Quantitative data determines the number or quantity of a substance. basically dealing with how much/many things are being used.
Now let's move on to questions ~
#1. Carbon is a organic molecule.
- Qualitative
#2. The forest is 25% oak trees.
- Quantitative
#3. Water contains covalent bonds.
- Qualitative
#4. Sheila's blood pressure is 120/80.
- Quantitative
#5. The bat arm and human arm have similar bone structure
- Qualitative
100 pts.
An object 8.25 cm from a lens creates a virtual image at -26.8 cm from the lens. What is the focal length of the lens?
(Mind your minus signs.) (Unit = cm)
Answer:
1 / f = 1 / i + 1 / o 1 / f = (o + i) / i o
f = i o / (o + i)
f = -26.5 * 8.25 / (8.25 - 26.8)
f = -221 / -.308 = 11.8 cm
A boy swings a 30 g fishing sinker around his head attached to his fishing line. The radius ofthe circular motion of the sinker is 65 cm. The sinker does 2 revolutions per second.
(a) What is the period of rotation of the sinker?
(b) What is the tangential velocity of the sinker?
(c) Calculate the acceleration of the sinker.
Explanation:
a) Peroid = 1/frequency
F = 2 rev. per second = 2Hz
period = 1/2 = 0.5s
b) Tangential velocity(Vt) = ωr, where ω is thr angular velocity(2 * Pi(3.142) * f(frequency)) and r is the radius
Therefore; Vt = 2 * 3.142 * 2 * 0.65(65/100)
= 8.1692
= 8.2m/s
c) a = (V^2)/r where V is the velocity and r is the radius
a = (8.2^2)/0.65
a = 103m/s^2
What is a common characteristic of outer planets?
Answer:
They are all composed of gases.
Explanation:
The inner planets are mainly composed of types of rock. The surface and interior is rocky but the atmosphere is composed of gases. The outer planets happen to be composed mainly of gas, or in other terms, elements. The two primary elements that make up these planets are hydrogen and helium. Because the inner planets are made up of primarily, they have given the nickname the "Terrestial Planets" and the outer planets are called "Gas Giants" because of their gas (elements) composed atmospheres and overall interiors.
Answer: A: they are composed of gas
Explanation:
I'm doing a gravity project and need a catchy title. Any ideas?
Answer:
Drop zone :)
Have a great day!!
Please rate and mark brainliest!!
Answer:
if it was a love story you could call it ¨falling for you¨ hehe though since it's a project I'm guessing it's not a love story lol.
Explanation:
Need help asap
Describe the subatomic particles of an atom and where they are located.
↪Nucleons include protons and neutrons. All the positive charge of an atom is contained in the nucleus, and originates from the protons. Neutrons are neutrally-charged. Electrons, which are negatively-charged, are located outside of the nucleus.
☆...hope this helps...☆
_♡_mashi_♡_
The nucleus of an atom of any chemical element comprises three (3) distinct subatomic particles and these are:
ProtonsNeutronsElectronsWhat is an atom?An atom simply refers to the smallest, basic (fundamental) and indivisible unit which comprises the matter that forms all chemical elements.
The subatomic particles of elements.Based on scientific information, the nucleus of an atom of any chemical element comprises three (3) distinct subatomic particles and these include the following;
Protons: they are positively charged and located within (inside) the nucleus of an atom.Neutrons: they are neutrally charged and located within (inside) the nucleus of an atom.Electrons: they are negatively charged and located outside the nucleus of an atom.Read more on atoms here: brainly.com/question/377844
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Analysis: (use a separate sheet of paper)
1. Write a scientific explanation about the relationship between frequency, wavelength, and
wave speed. Make sure to cite specific evidence from your investigation.
2. In one or two sentences describe how the frequencies of the different harmonic patterns
are related to each other.
3. If the frequency, increases what happens to the wavelength?
Speed, frequency and wavelength are interconnected to each other.
What happens to the wavelength if the frequency increases?As a wavelength increases in size, its frequency and energy (E) decrease. As the frequency increases, the wavelength gets shorter. As the frequency decreases, the wavelength gets longer.
The wave speed is equal to the product of its frequency and wavelength, which shows the relationship between frequency and wavelength.
So we can conclude that speed, frequency and wavelength are interconnected to each other.
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What resultant force is required to accelerate a 1600kg automobile uniformly from 8m/s to 30m/s in 10s?
Answer:
3520
Explanation: Force = Mass x Acceleration [∴ or F = ma]. Given values. mass, m = 1600 kg; initial velocity, u = 8 m/s; final velocity, v = 30 m/s; time taken, t = 10 s.
Define the following:-
1. Diffusion
2. Rigidity
3. Fluidity
[ oOBrainlyNobitaOo ]
Answer:
1.diffusion, process resulting from random motion of molecules by which there is a net flow of matter from a region of high concentration to a region of low concentration. A familiar example is the perfume of a flower that quickly permeates the still air of a room.
2.Rigidity means no bending — in that case, of the rules. Objects and substances can have rigidity as well, if they literally won't bend. Rigidity means about the same thing as inflexibility, another word that describes rock-solid, unyielding people and substances.
3.the ability of a substance to flow easily
Explanation:
Hope it helps
Which of jupiter’s moons is the largest moon in the solar system?.
Answer:
Ganymede
Explanation:
Jupiter’s Moon Ganymede is the largest Moon in the solar system. It’s even larger than the planet Murcury.
I hope it helps! Have a great day!
Muffin ^^
Answer:
Ganymede
Explanation:
The largest moon is Jupiter’s moon, Ganymede. It is the largest out of all the moons we have in our solar system.
I hope it helps! Have a great day!
.-.
PLS HELP THIS IS DUE TOMORROW!!!
A real-life example of something that uses energy and all of the energy
Answer:
A ball rolling down a hill
Explanation:
Requires an input of gravitional potential energy
outputs rotational kinetic energy and translational kinetic energy
part b
The EPA examines six air pollutants to assess air quality. These pollutants are listed in the table. To learn more about them, conduct research using the search term "EPA six common air pollutants." Use your research to fill in the table.
part c
In 1970, the US Congress passed the Clean Air Act to combat increasing levels of harmful pollution in the atmosphere. The law was amended in 1977 and 1990 to make major improvements. Read a brief summary about the Clean Air Act. Then read about how our nation's air status and trends have changed since this law was passed. As you’re reading and scrolling through the nation’s air quality trends, list three positive or negative outcomes of the Clean Air Act.
part d
This image from the EPA shows the projected benefits and costs from the most recent amendments to the Clean Air Act. A net improvement in economic welfare is projected because cleaner air leads to better health and productivity for American workers. It also reduces medical expenses for air pollution-related health problems.
Answer:
Part C is the first one and Part D is the second one. hope this helps you a lot because i did for me and I got a A+
Explanation:
Positive Outcome :
Cleaner lungs.
Decreased asthma and allergies symptoms.
Improved skin appearance.
Helps digestion.
Psychological and emotional stabilizer.
Better mood and normalized sleep patterns.
Reduce chances of lung, heart, and arterial diseases.
Negative Outcome :
According to the EPA, when we are exposed to high levels of hazardous air pollutants for an extended period of time .
We face a greater risk of suffering serious health effects, including respiratory diseases, neurological disorders, reduced fertility, damage to our immune system, and increased risks of getting cancer.
One of the health hazards that suprised me is that outdoor pollution is associated with hearth attacks. I know that outdoor pollution causes lung problems whether that's asthma attacks or bronchitis, but I didn't know about heart attacks. Apparently, air pollution can trigger heart attacks, stroke, and irregular heart rhythms. People who are already at risk for these conditions are more likely to have any of those. Air pollution causes damage to the inside walls of your blood vessels, causing them to become narrower and harder. Along with that, there are many different positives and negatives that came from the Clean Air Act some of which are more of these one that I explained on the top.
A summary paragraph evaluating the Clean Air Act in terms of cost and effectiveness given below.
What is pollution?The contamination of air or water or land by the human waste or chemicals is called as pollution.
Positive Outcomes are -
Cleaner lungs.Diminished asthma and sensitivities side effects.Further developed skin appearance.Helps absorption.Mental and close to home stabilizer.Better temperament and standardized rest designs.Lessen chances of lung, heart, and blood vessel illnesses.Negative Outcome is -
As indicated by the EPA, when we are presented to elevated degrees of perilous air poisons for a lengthy timeframe .
We face a more serious gamble of experiencing serious wellbeing impacts, including respiratory sicknesses, neurological issues, decreased fruitfulness, harm to our insusceptible framework, and expanded dangers of getting malignant growth.
The outside contamination is related with hearth assaults. Open air contamination causes lung issues like asthma assaults or bronchitis . Air contamination can set off coronary episodes, stroke, and sporadic heart rhythms. Air contamination makes harm within walls of your veins, making them become smaller and harder.
Thus, the Clean Air Act is explained.
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A sample of an unknown substance has a mass of 0.465 kg. if 3,000.0 j of heat is required to heat the substance from 50.0°c to 100.0°c, what is the specific heat of the substance?
The specific heat of the substance will be 0.129 J/g°C.
What is specific heat capacity?The amount of heat required to increase a substance's temperature by one degree Celsius is known as specific heat capacity.
Similarly, heat capacity is the relationship between the amount of energy delivered to a substance and the increase in temperature that results.
The given data in the problem is;
Q is the amount of energy necessary to raise the temperature = 3,000.0 j
M is the mass= 0.465 kg.
Δt is the time it takes to raise the temperature.=50°c
s stands for specific heat capacity=?
Mathematically specific heat capacity is given by;
[tex]\rm Q= MC \triangle t \\\\ C = \frac{Q}{M\triangle t} \\\\ C = \frac{3000}{0.465 \triangle 50} \\\\ C =129.0 J/Kg^0C \\\\ C= 0.129 J/g^0C[/tex]
Hence the specific heat of the substance will be 0.129 J/g°C.
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The mechanical energy of the diver is the same at every height. What is the mechanical energy of the diver
When the weight moves, it has kinetic energy. Is this energy the result of a transfer or a transformation of energy from the spring? A transfer of energy means that the energy does not change form but is shifted from one object to another.
Answer:
I believe the answer is transformation
Explanation:
Which purpose does a light bulb serve in a circuit?
Answer:
A light bulb is that component of circuit that lights up when electricity flows through it and vice versa. Its main function is to tell whether electricity is being supplied or not. Its function is also to light up dark places.
Explanation:
Answer:
A light bulb is that component of circuit that lights up when electricity flows
Explanation:
Which shows the correct order of processes leading up to the formation of a main sequence star?
The processes leading up to the formation of a main sequence star is that gases condense to form a nebula, gravity causes the nebula to collapse.
What is a nebula?It should be noted that nebula simply means a stellar nursery where the stars take birth. Also, gases condense to form nebula.
In this case, the processes leading up to the formation of a main sequence star is that gases condense to form a nebula, gravity causes the nebula to collapse and spin.
Lastly, a protostar forms and then nuclear fusion occurs.
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Am object with a mass of 1298 kg is accelerating at a rate of 17 m/s2 when a net force is applied to it. What is the magnitude of the net force that is acting on the object? Could show how you did it please
Answer: 22,066N
Explanation:
By Newton's second Law of Motion, the force on an object is proprtional to the acceleration of the object. The proportionality constant is the mass of the object:
[tex]F=ma[/tex]
Plug in the mass and accleration of the system:
[tex]F=(1298kg)(17m/s^2)[/tex]
[tex]F=22,066N[/tex]
The units for force are Newtons, or equivalently kg*m/s^2.
A torsional oscillator has a period of 0.45 s. If its rotational inertia is 0.25 kg-m2, what is the torsional spring constant of its spring
The torsional spring constant of the torsional oscillator (I = 0.25 kg · m² and T = 0.45 s) has a magnitude of 48.738 newton-meters.
How to determine the constant of a torsional spring
The torsional spring constant indicates the resistance of the spring to an external moment. The torsional spring constant (κ), in newtons per meter, can be found by means of this formula in function of the period (T), in seconds and the moment of inertia (I), in kilograms per square meter:
[tex]\kappa = \frac{4\cdot \pi^{2}\cdot I}{T^{2}}[/tex] (1)
If we know that I = 0.25 kg · m² and T = 0.45 s, then the torsional spring constant of the spring is:
[tex]\kappa = \frac{4\cdot \pi^{2}\cdot (0.25\,kg\cdot m^{2})}{(0.45\,s)^{2}}[/tex]
κ = 48.739 N · m
The torsional spring constant of the torsional oscillator (I = 0.25 kg · m² and T = 0.45 s) has a magnitude of 48.738 newton-meters. [tex]\blacksquare[/tex]
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Q1. Explain the conservation of energy in terms of the energy transformation(s) that occur when you strike (light) a match.
Q2. When you turn on a lamp at home you are using electricity generated by a power company or public utility. Assume the electricity powering the lamp was generated at a coal burning power plant and explain the conservation of energy in terms of the energy transformations that occur when you turn on the lamp.
Q3. Unless you push a pendulum at the start of it's swing (doing work to give it extra energy), will it ever swing higher than it's starting point? Explain your answer in terms of kinetic and potential energy.
Q4. Does a pendulum swing forever? Why or why not?
Q5. Unless you push a pendulum at the start of it's swing (doing work to give it extra energy), will it ever swing higher than it's starting point? Explain your answer in terms of kinetic and potential energy.
Q6. Describe the transformations between potential and kinetic energy when you drop a 15000 gram television from a height of 0.8 meters.
Q7. A car with a mass of 860 kg sits at the top of a 32 meter high hill. Describe the transformations between potential and kinetic energy that occur when the car rolls to the bottom of the hill and continues rolling.
Q8. How is the previous problem different from ones where the object comes to a stop at the end of moving/falling? Discuss what happens to the energy in each case and how they are different.
Q9. Describe the transformations between potential and kinetic energy that occur when a 1000 kg rock falls from the top of a 18 meter cliff.
Q10. How much kinetic energy does a 2000 gram ball have the instant before it hits the ground after falling from a height of 6 meters?
Q11. Assume the collision in problem 10 is perfectly elastic (no energy is lost) and there is no air friction. How high should the ball bounce? Describe the transformations between potential and kinetic energy that will occur from when the ball is dropped till it reaches the top of it's first bounce.
1) when we light a matchstick,the energy which got consumed in while rubbing the matchstick against the surface,turns into heat and hence ,it lights , therefore,the energy gets transferred from one type to another which proves the law of conservation of energy.
2) The coal gets burn and generate into electricity which further used by us for various purposes like lighting lamp and since the energy gets transferred from one source to another instead of ceasing, it proves the statement of conservation of energy.
3) As the pendulum swings in air , it continues to move from one point to another, changing potential energy to kinetic energy due to the motion that's taking place and unless an external force interferes, it's speed won't increase as at some point due to the friction by air will resist the movement resulting in decresement of kinetic energy and increased potential energy, thus ,at some point it will come to rest .
4) No ,it doesn't , because due to the force of friction,the disturbance in the movement of it ,takes place, making it stop at a specific point after some time.
5) As the pendulum swings in air , it continues to move from one point to another, changing potential energy to kinetic energy due to the motion that's taking place and unless an external force interferes, it's speed won't increase as at some point due to the friction by air will resist the movement resulting in decresement of kinetic energy and increased potential energy, thus ,at some point it will eventually come to rest .
6)
Mass (m)⇢15000 gram = 15 kgHeight(h)⇢0.8 metersAcceleration due to gravity(g)⇢9.8m/s²Potential energy ⇢mghPotential energy ⇢(15 x 9.8 x 0.8 )JPotential energy ⇢117.6 J7)
Mass (m)⇢15000 gram = 860 kgHeight(h)⇢32metersAcceleration due to gravity(g)⇢9.8m/s²kinetic energy ⇢mghkinetic energy ⇢(860 x 9.8 x 32 )Jkinetic energy ⇢269,696 J8) In the previous problem ,the kinetic energy increases as continues rolling and the potential energy decreases in this process of prolongation of the movement ,while ,when an object comes to rest after the process of moving or falling, it's potential energy is at the highest while the kinetic energy is just the opposite .
9)
Mass (m)⇢ 1000kgHeight(h)⇢18 metersAcceleration due to gravity(g)⇢9.8m/s²Kinetic energy ⇢mghKinetic energy ⇢(1000x 9.8 x 18 )JKinetic energy ⇢176,400 J10)
Mass (m)⇢ 2000 gm = 2kgHeight(h)⇢6metersAcceleration due to gravity(g)⇢9.8m/s²Kinetic energy ⇢mghKinetic energy ⇢(2x 9.8 x 6 )JKinetic energy ⇢117.6 J11)
In perfectly elastic collision, there's no loss of energy, hence ,the energy that got used up in the starting to bounce the ball ,will remain the same throughout the whole collision and the height would be the same 6 meters and kinteic energy would be 117.6J