Answer:
D. Electromagnetic waves can travel through empty space
Explanation:
After a few Google searches, this answer seems the most correct
Electromagnetic waves differ from mechanical waves by the fact that electromagnetic waves can travel through empty space.
What are electromagnetic waves?The electromagnetic radiation consists of waves made up of electromagnetic field which are capable of propogating through space and carry the radiant electromagnetic energy.
The radiation are composed of electromagnetic waves which are synchronized oscillations of electric and magnetic fields . They are created due to change which is periodic in electric as well as magnetic fields.
In vacuum ,all the electromagnetic waves travel at the same speed that is with the speed of air.The position of an electromagnetic wave in an electromagnetic spectrum is characterized by it's frequency or wavelength.They are emitted by electrically charged particles which undergo acceleration and subsequently interact with other charged particles.
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The Appalachian mountain range in the Eastern United States was once much taller than the Rocky mountain range in the Western United States. Currently, however, the Appalachian mountain range is much smaller than the Rocky mountain range
What do you think may have caused this change in height?
Answer:
The answer is erosion
Explanation:
I did this before
which of the following is greater:A.7.8grams per millilitre or 4.1 microgram per microlitre
B.3×10¬²kilograms/cm³ or 3×10¬1 milligrams/cm³
Answer:
A : 7.8 grams per millilitre
B : 3×10^-2 kilograms/cm^3
What type of wave does NOT need matter to carry energy? *
1 point
Sound wave
Ocean wave
Electromagnetic wave
Answer:
I guess sound wave I s gonna be d right answer
Explanation:
cos sound doesnt has weight and occupies space
Answer:
Electromagnetic wave
Explanation:
Which aspect of health is best illustrated by the following example? I work well in a group and
respect my other classmates.
O social
O physical
O emotional
Which scientist was the first to propose the heliocentric model of the universe?
Answer:
Nicolaus Copernicus
-He was a Mathematician
Explanation:
HIIIIII I NEED HELPPPPPP
You may choose to answer them all, but if you'd like, just answer a few of them :)
1. The unit of electric potential or electromotive force is the _____.
volt
ohm
ampere
franklin
2. In a circuit, a battery is used to _____.
conduct current
slow down current
raise the potential of electrons
convert electrical energy to some other form of energy
3. Why is current supplied to consumers from generating plants in the form of alternating current?
Direct current cannot be generated in the amount necessary to supply enough consumers.
It is a much more efficient mode of transmitting electricity than direct current.
This is the only form that current can be transmitted over the long distances.
It is way too dangerous to transmit direct current to consumers' homes.
4. When you turn on a television, the electrical circuit _____.
closes
opens
does not move
Answer:
voltraise the potential of electronsIt is a much more efficient mode of transmitting electricity than direct current does not movesArrange the movement/act/organization in ascending order of occurrence. Energy Supply and Environmental Coordination Act Nature Conservancy Intergovernmental Panel on Climate Change (IPCC) Clean Water Act Federal Water Pollution Control Act Eastern Wilderness Act Water Quality Act Toxic Substances Control Act Clean Air Act Endangered Species Preservation Act ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓
Answer:
PLATO!!!!! THESE ARE RIGHT!!! OTHERS ARE NOT CORRECT. I JUST GOT IT RIGHT ON PLATO
Explanation:
1. federal water pollution control act
2.nature conservancy
3. clean air act
4. water quality act
5. endangered species preservation act
6. clean water act
7. energy supply and environmental coordination act
8. eastern wilderness act
9. toxic substance act
10. intergovernmental panel on climate change (IPCC).
Where does the rest of the energy 90% go?
Answer:the 90% is spent performing other functions
Explanation:
Which statement is true about the loudness of a sound?
A.) it is directly proportional to the distance of the listener from the source.
B.) it is inversely proportional to the square of the distance of the listener from the source.
C.) it is directly proportional to the square of the distance between the listener from the source.
D.) it is inversely proportional to the distance between the listener from the source.
Answer:
The Answer is B
Explanation: The loudness is shared among the listener and source
Answer : The correct option is, (B)
Explanation :
There is a direct relation between the loudness of sound and the intensity of sound.
[tex]L=10 log \frac{I}{Ia} }[/tex] ..........(1)
where,
L = loudness of sound
I = intensity of sound
= intensity of reference
From this we conclude that the loudness is directly proportional to the intensity of the sound.
There is an indirect relation between the intensity of sound and the distance of the listener from the source.
[tex]\frac{I_1 }{I_2 } = (\frac{d_1}{d_2} )^{2}[/tex] ...................(2)
From this we conclude that the intensity of sound is inversely proportional to the square of the distance of the listener from the source.
From equation (1) and (2) we conclude that the loudness of sound is inversely proportional to the square of the distance of the listener from the source.
Hence, the correct option is, (B)
How do we know what is inside of Earth ?
Answer:
Most of what we know about the interior of the Earth comes from the study of seismic waves from earthquakes. Seismic waves from large earthquakes pass throughout the Earth. These waves contain vital information about the internal structure of the Earth.
Calculate the pressure in pascals if a 140N force is applied to an area of 0.1m².
Answer:
Pressure = 1400 pascals
Explanation:
The formula to measure pressure is Pressure equals force in pounds over the area in square inch. The written abbreviated formula is P= F/A. By looking at the formula one can see that top obtain the pressure on an object, one must divide the the force by the area of an object.
P = 140/0.1
P = 1400
[tex]\\ \rm\longmapsto Pressure=\dfrac{Force}{Area}[/tex]
[tex]\\ \rm\longmapsto Pressure=\dfrac{140}{0.1}[/tex]
[tex]\\ \rm\longmapsto Pressure=1400Pa[/tex]
Rachel is looking at a swamp. She sees sandhill cranes swooping by, algae on a pond, small snails, fungi, and some fish. Explain how the organisms Rachel sees are connected and how they all help the swamp ecosystem thrive.
Answer:
The organisms Rachel see are all inter dependent on one another to survive in the form of a food chain. This relationship helps the swamp ecosystem thrive.
Explanation:
In this swamp ecosystem, the Sandhill crane relies on the fishes for food, Some of the fishes rely on the algae or the snail for food and the snail also rely on the algae for food. This relationship not only serves to nourish the organism above the food chain but serves a general purpose of controlling the ecosystem. The absence of one or more of these organisms, say the algae can offset the ecosystem in a chain reaction that might go as far as affecting the cranes. Also, the absence of algae feeders can lead to an algae boom which might overpower the oxygen concentration in the pond further killing other organisms in the pond that need oxygen for respiration.
who is the founder of pelincilin
Answer:
Alexander Fleming
Explanation:
the founder of pelincilin is Alexander Fleming
what are the first 20 elements and their chemical symbols
Jane is standing directly behind Kevin.
Would Jane be able to attract Kevin's attention by just staring at him?
Yes/ No ...................................
Explain your answ
Answer:
NO
Explanation:
It is just impossible to know if someone is staring at you while they are standing behind you. UNLESS they turned around OR was able to see them though a mirror of some sort. :)
Many automatic processes use circuits to accomplish a task. Thermostats, automatic light switches, motors, and home security systems all use circuits. Besides common electronic devices such as stereos, iPods, computers, cell phones, video games, TVs, DVD players, what other things in our world use circuits?
Answer:
homes and cars
Explanation:
There are many devices in our day to day lives that use circuits in order to function. Aside from all those that are listed in the question some others include, our entire homes and cars, with the main difference being the amount of voltage that is being used. Just like tv's and computers, houses and cars use electrical circuits on a much larger scale in order to provide electricity to different parts of the system.
The diagram shows the results when two parents are
crossed. The letters represent alleles for a trait that is
controlled by three different genes.
Which best describes this inheritance pattern?
multiple allele because a trait is controlled by three different genes
polygenic because the offspring have alleles from both parents
multiple allele because the offspring have alleles from
both parents
polygenic because a trait is controlled by three different
genes
Answer:
Polygenic because a trait is controlled by three different genes
Explanation:
In the given question, the diagram of the question is not found anywhere therefore the question has been answered based on previous knowledge.
The traits of an organism are determined by the sequences of nucleotide present on the DNA called genes. One gene-one protein hypothesis suggests that usually one trait is determined by 2 alleles of a gene but there are few traits which are either determined or influenced by more than one gene.
These traits are known as the polygenic trait as the traits are controlled by more than one or "poly (many) genes" like human eye color, height, and others.
Thus, the selected option is the correct answer.
Answer:
Polygenic because a trait is controlled by three different genes
Explanation:
got 100%
Think about the oscillation of the toy shown in the video. when the toy is at the highest point of its motion, its velocity is _____ and its acceleration is _____.
Answer: i dont really get what u are asking but here is what im guessing u mean.
Explanation:Refer to the diagram shown below.
m = 50 g = 0.05 kg, the mass of the ball
A = 6 cm = 0.06 m, the amplitude
The oscillatory motion relative to the equilibrium position is
x(t) = A cos(ωt)
where
x = displacement at time t
A = amplitude, 0.06 m
ω = circular frequency
Therefore
x(t) = A cos(ωt)
The velocity function is
v(t) = - ωA sin(ωt)
The maximum velocity occurs when sin(ωt) = 1. Because the maximum velocity is 3.2 m/s, therefore
(ω 1/s)*(0.06 m) = (3.2 m/s)
w = 53.33 1/s
Therefore
x(t) = 0.06 cos(53.33t)
v(t) = 3.2 sin(53.33t)
When the spring is compressed by 4.5 cm (0.045 m) from the equilibrium position, then
0.06 cos(53.33t) = -0.045
cos(53.33t) = -0.75
53.33t = cos⁻¹ (-0.75) = 2.4189
t = 0.0454 s
The velocity when t = 0.0454 s is
v = 3.2 sin(53.33*0.0454) = 2.111 m/s
The kinetic energy is
KE = (1/2)*m*v²
= 0.5*(0.05 kg)*(2.111 m/s)²
= 0.1114 J
Answer: 0.1114 J
When the toy is at the highest point of its motion, its velocity is zero and its acceleration is negative.
Why is acceleration 0 at the highest point?Any projectile's instantaneous speed at its maximum height is zero. Because gravity gives the ball the same acceleration on the way up as it does on the way down, the time it takes to reach maximum altitude is the same as the time it takes to return to its launch position.
Because of the -ve acceleration along the vertical direction, velocity decreases until it reaches zero.
The velocity of a projectile is zero at its highest point. A projectile's acceleration is zero at its highest point.
When going up, the acceleration is negative because the speed is decreasing. When going down, the acceleration is negative because it is moving in the opposite direction, down.
Thus, When the toy is at the highest point of its motion, its velocity is zero and its acceleration is negative.
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state any differences between Mass and weight
Answer:
The difference between mass and weight is that mass is the amount of matter in a material, while weight is a measure of how the force of gravity acts upon that mass. Mass is the measure of the amount of matter in a body. ... Weight usually is denoted by W. Weight is mass multiplied by the acceleration of gravity.
Answer:
mass is present in the substance and weight is the force exerted by gravity
(0) Calculate the momentum of the vehicle when it moves at the maximum speed of 90 km/h with load of 3000 kg
Answer: [tex]75000kg*m/s[/tex]
Explanation:
[tex]p=mv[/tex]
where;
p = momentum
m = mass = 3000kg
v = velocity = 25m/s
--------------------------------------------------------------------------------------------------
The first thing we need to do is convert 90km/h to m/s. Our conversion factors here are: 1km = 1000m and 1h = 3600s
[tex]90km/h(\frac{1000m}{1km})(\frac{1h}{3600s} )=25m/s[/tex]
Plug your values in the formula:
[tex]p=(3000kg)(25m/s)\\p=75000kg*m/s[/tex]
At t= 0, a particle moving in the xy plane with constant acceleration has a velocity of Vi= (3.00i -2.00j) m/s and is at the origin. At t= 3.00 s, the particle's velocity is V = (9.00i + 7.00j) m/s . Find (a) the acceleration of the particle and (b) its coordinates at any time t.
Answer:
(a) a = (2i + 4.5j) m/s^2
(b) r = ro + vot + (1/2)at^2
Explanation:
(a) The acceleration of the particle is given by:
[tex]\vec{a}=\frac{\vec{v}-\vec{v_o}}{t}\\\\[/tex]
vo: initial velocity = (3.00i -2.00j) m/s
v: final velocity = (9.00i + 7.00j) m/s
t = 3s
by replacing the values of the vectors and time you obtain:
[tex]\vec{a}=\frac{1}{3s}[(9.00-3.00)\hat{i}+(7.00-(-2.00))\hat{j}]\\\\\vec{a}=(2\hat{i}+4.5\hat{j})m/s^2[/tex]
(b) The position vector is given by:
[tex]\vec{r}=\vec{r_o}+\vec{v_o}t+\frac{1}{2}\vec{a}t^2[/tex]
where vo = (3.00i -2.00j) m/s and a = (2.00i + 4.50j)m/s^2
The velocity time- graph of a body undergoing uniform acceleration is
Select one:
a. not a straight line
b. straight line parallel to x-axis
c. straight line inclined to x-axis
What is the VR if a slope of length 20 m that rises
to a height of 5 m?
Answer:
vR= effort distance/ load distance
VR = height / length
VR. = 5/20
VR = 0.25
3. If the tyre of a car has a diameter of 0.7 m and if the wheel has an angular velocity of 10 radians per second, what is the speed of the car in m/s
Answer:
speed = radius x angular velocity
= 0.7/2 x 10
= 3.5 m/s
In the formula V =E ^b d ^a, if V, E and d are the velocity longitudinal waves, bulk modulus of elasticity and density of the gaseous medium respectively, then calculate the values of a and b
Answer:
[tex]b=\frac{1}{2}[/tex] and [tex]a=-\frac{1}{2}[/tex]
Explanation:
The velocity longitudinal waves depends on the bulk modulus and the density. It is given by the formula:
[tex]V=\sqrt{\frac{\beta }{\rho} }[/tex]
Where V is the velocity , β is the bulk modulus and ρ is the density.
[tex]V=\sqrt{\frac{\beta }{\rho} }\\V=\frac{\beta^\frac{1}{2} }{\rho^\frac{1}{2} } \\V=\beta^\frac{1}{2} \rho^-\frac{1}{2}[/tex]
Therefore comparing with [tex]V =E ^b d ^a[/tex], where V, E and d are the velocity longitudinal waves, bulk modulus of elasticity and density, the values of b and a can be gotten.
Therefore, [tex]b=\frac{1}{2}[/tex] and [tex]a=-\frac{1}{2}[/tex]
does earths surface heat up the same everywhere
the correct answer is no ;)
Answer:
. .
Explanation
. .
.
Water at the Antarctica usually exits as ice, making it very difficult to use the water or conduct experiment requiring the water to be in liquid state. A coffee addicted physicist stationed at a research base requires about 0.8 kg of ice for his coffee on the hour. a. How much heat is required to convert 0.8 kg of ice at -35 "C into steam at 100 C7 b. Plot the temperature - energy graph for the processes in (a). 5] [5] c. The surface tension of water was determined in a laboratory by using the drop weight method. 100 drops were released from a burette the inner diameter of whose opening is 1.8 mm. The mass of the droplets was 3.78 g. 1. Determine the surface tension of the water and comparing it with the tabulated value, i. Calculate the relative error of the measurements: [6] [4]
Answer:
water or conduct experiment requiring the water to be in liquid state. A coffee
addicted physicist stationed at a research base requires about 0.8 kg of ice for
his coffee on the hour.
a. How much heat is required to convert 0.8 kg of ice at -35 °C into steam
at 100°C?
[5]
b. Plot the temperature - energy graph for the processes in (a). [5]
C. The surface tension of water was determined in a laboratory by using
the drop weight method. 100 drops were released from a burette the
inner diameter of whose opening is 1.8 mm. The mass of the droplets
was 3.78 g.
i. Determine the surface tension of the water and, comparing it
with the tabulated value,
161
ii. Calculate the relative error of the measurements.
A green light has a wavelength of 485 nm.
What is its frequency? (1 nanometer is 10-9 m)
Answer:
Explanation:
C bro
The table lists pressure and volume values for a particular gas. Which is the best estimate for the value of V at P = 7.0 × 103 pascals?
P (pascals) V (liters)
5.0 × 103 6.0
1.5 × 104 3.0
2.0 × 104 2.0
2.5 × 104 1.5
Answer:
2.0 × 104 2.0
According to the Premable to Bill of Rights what is the purpose of the bill of rights guaranteed everyone's rights to stop people from depriving others of their rights
Answer:
to prevent the government from abusing people's rights
Explanation:
Bill of rights is made up of the first ten amendments to the United States Constitution.
The bill of right include Freedom of religion, speech, press, assembly and petition.
The Right to keep and bear arms in order to maintain a well regulated militia.
The Right to due process of law, freedom from self-incrimination, double jeopardy.
The purpose of this bill is to protect the rights of citizens against infringement from the government,public officials and private citizens.