Answer:
[tex]v'=v_2-v_1=5\frac{km}{h}[/tex]
Explanation:
The relative speed between the trains is given by:
[tex]v'=v_2-v_1[/tex]
v1: speed of the first train
v2: speed of the second train
To find the relative velocity you write the equation of motion of both train by taking into account the information of the statement. The trains have constant velocity. Furthermore, the second train stars 10 km behind the other one. hence you have:
[tex]x=10+v_1t\\\\x=v_2t[/tex]
for t = 2 hours, the positions of both trains are equal, thus you have:
[tex]10+v_1t=v_2t[/tex]
you factor v2 - v1 from the last equation and replace t = 2h:
[tex]10=v_2t-v_1t\\\\10=(v_2-v_1)t\\\\v_2-v_1=\frac{10}{t}=\frac{10}{2}=5 \frac{km}{h}[/tex]
Hence, you have that the relative velocity is:
[tex]v'=v_2-v_1=5\frac{km}{h}[/tex]
Identify the sentence
When you can see both sides of an issue equality we’ll, you find it difficult to take a stand , but some people insist that you take one side or another .
Answer:
compound-complex sentence. two independent clauses, one dependent clause
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
who is the founder of pelincilin
Answer:
Alexander Fleming
Explanation:
the founder of pelincilin is Alexander Fleming
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]
Which action can be explained by physics?
Answer:
Actions that underlie mathematical rules, patterns or probability distributions.
For example how fast something falls at any given point or time.
More complex actions, such as human decision making in single individuals would be way too complicated to describe in physical terms.
But note that there can be physical models of such things as traffic when we can assume statistical knowledge of behavior.
Also physical models are used to plan such things as emergency exits in big stadiums, because many thousands of people can be described as particles flowing under a given pressure.
Every time we can gain good statistical knowledge and can therefore see patterns and rules in action, we can build theoretical models to make predictions and simulations (and games btw)
Since it's fair to say that mathematics is the science of patterns, it is plausible that physical descriptions often come in mathematical formulations, so that it can be understand as an efficient language of physics.
Neighboring disciplines like chemistry relay on physical theories to build on them,and then add shortcuts to fit their needs and interests, generating an own language for their field of study. But physicists may refer to them as anadd-on to physics.
Physics can basically explain all actions wich you can express in numbers.
But note that on a fundamental level physics describes 'how' things work, not necessarily 'why' they do it this way. The source of the basic and most fundamental physical constants and rules remains a mystery till this day.But of course there are theories on that as well, wich mostly can neither be proved or falsified.
The text is my own work and based of my general knowledge and quintessence of lectures on physics and other fields I attended.
(I would really appreciate the brainliest)
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.
Both X-rays and gamma rays have higher frequencies than ultraviolet rays
True or False
Answer:
i believe its True
Explanation:
Describe how energy from the sun interact with substances
Answer:
substances will move faster and become warm to the touch.
Explanation:
when the radiation from the sun comes down and hits substances, the substances absorbs the radiation making them warm. the absorbed energy is transformed into heat energy. this heat energy plays an important role in regulating the temperature of the Earths crust, surface waters, and low atmosphere.
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.
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
2. How much current is in a circuit that includes a 1.5-volt battery and a
bulb with a resistance of 2 ohms?
Answer:
V = IR
I = V/R
= 1.5 / 2
= 0.75 A
which characteristics are common to amphibians, lemurs, and humans?
vertebrae, tetrapod, hair
amniotic egg, hair, biped
tetrapod, vertebrae
tetrapod, hair
Let's see what these words mean:
Vertebrae means a backbone as well as an internal skeleton
Hair is the body's way of creating a defense for the skin (and additionally to look bigger)
Tetrapod is a four footed animal
Amniotic egg means that the embryo develops inside an egg.
Biped means using two feet to walk.
Amphibians, lemurs, and humans both have vertebrae and tetrapod. While humans do not walk on four legs it is said that humans are classified as that group
Answer:
A small, lemur-like creature may have been an early ancestor of monkeys, apes, and humans.
Explanation:
Water in the Antarctica usually exists as ice ,making it very difficult to use the water or conduct experiments reqiring the water to be in liquid state .A coffee addicted physisits stationed at a research base requires about 0.8 kg of ice for his coffe on the hour
Answer:
2730.304 KJ
Explanation:
How much heat is required to convert 0.8 kg of ice at -35°C into steam at 100 C?
Given that:
mass of ice (m) = 0.8 kg = 800 g
Initial temperature ([tex]T_i[/tex]) = -35°C = 238 K
final temperature ([tex]T_n[/tex])= 100°C = 373 K
Specific heat of ice ([tex]S_i[/tex]) = 2.108 J/g.K
Specific heat of water ([tex]S_w[/tex]) = 4.18 J/g.K
Latent heat of fusion ([tex]L_f[/tex]) = 334 J/g.
Latent heat of vaporization ([tex]L_v[/tex]) = 2230 J/g.
[tex]\Delta T=T_n-T_i=373-238=135K[/tex]
Total heat (Q) required to increase the temperature of ice from the initial temperature of 238K to final temperature of 373 K is given by the equation:
[tex]Q=m\Delta TS_i+m\Delta TS_w+mL_f+mL_v\\Q=800(135)*2.108+800(135)*4.18+800*334+800*2230\\Q=227664+451440+267200+1784000=2730304J\\Q=2703.304KJ[/tex]
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 movesWhat part of the Milky Way allows for determination of its rotational direction? A. Celestial body B. Galactic body C. Galactic disk D. Two long tails
Answer: C. Galactic disk
Explanation:
The part of the Milky Way which allows the determination of it rotational direction is known as the Galactic disk. This disc are shaped because they contain gases which are rich and dynamically young. It is also a part of a group of a galaxies disc is a component of disc galaxies, known as spiral galaxies and lenticular galaxies.
Answer:
Galactic disk
Explanation:
Galactic disc's are composed mostly of the galaxy's stars and a gaseous component mostly composed of cool gas and dust. The stellar population of galactic discs tend to exhibit very little random motion with most of its stars undergoing nearly circular orbits about the galactic center. This circular orbit maintains the galaxy's rotation momentum.
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
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
A drive is driving a car at 36 km per hour. When he applies brake they cause a deceleration of 3 ms-2. If he takes 1s to apply the brakes ______is the distance travelled by the car during this period
A)16.67m
B)16m
C)21.75m
D)15
Answer:
I would say 16m because of the power some brakes have say if you were to be going at 100 miles it would stop in about 3 seconds.
Arrange 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).
Why is it important to study rocks?
Answer:
It is imjportant to study rocks because geology gives an untouvhed pice of our history. Rocks can tell about our past, whether it is weather, animals, plants, tools, climate, or anything else, rocks can help solve world problems.
Walt ran 5 kilometers in 25 minutes going eastward what is his average velocity
Answer:
1/5 km/min
Explanation:
the formula for velocity is distance/time
so if i plug in the distance and time i get 5/25 or 1/5
Hope this helps!
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)
Where does the rest of the energy 90% go?
Answer:the 90% is spent performing other functions
Explanation:
how is a runoff created
Answer:
Runoff occurs when there is more water than land can absorb
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.
To learn more about an acceleration, follow the link;
https://brainly.com/question/12550364
#SPJ2
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
Balance the following chemical equations
Answer:
Enter an equation of a chemical reaction and click 'Balance'. The answer will appear below
Always use the upper case for the first character in the element name and the lower case for the second character.
To enter an electron into a chemical equation use {-} or e
To enter an ion specify charge after the compound in curly brackets: {+3} or {3+} or {3}. Example: Fe{3+} + I{-} =...
Substitute immutable groups in chemical compounds to avoid ambiguity. For instance equation C6H5C2H5 + O2 = C6H5OH + CO2...
Explanation:
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. :)
What is one energy conversion that doesn’t help.
What is the most significant factor in determining kinetic energy?
Answer:
Mechanical energy is the total energy of the body is made up of scientific energy and potential synergy, these two can be converted into one another without needing help.
The most determining factor of kinetic anergy is speed since it is squared
Explanation:
Mechanical energy is the total energy of the body is made up of scientific energy and potential synergy, these two can be converted into one another without needing help. Kinetic energy is the energy of movement, increasing the speed of the body increases the kinetic energy.
The energy powers an energy from the system configuration when changing to a lower energy configuration this is converted into mechanical energy.
The most determining factor of kinetic anergy is speed since it is squared