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The four variables that must be controlled for the results of Maria and Elena to be valid are
TemperatureAmount of lightHumidity Time.Variables in an experiment are those values that can change.
When conducting an experiment, there are usually different types of variables that are used and one of such is the Controlled variables.
The Controlled variables are known as those extraneous variables that can affect the results ( dependent variables) of an experiment. Therefore they should be held constant in order to obtain a valid result.
Examples of such controlled variables are Temperature, Amount of light,
Humidity and Time.
Take for instance, If the experiment conducted by Maria and Elena has to do with the rate at which an enzyme acts on different substrates. The temperature of the experiment needs to be constantly maintained to achieve a valid result.
This is because an increased temperature leads to increased rate of reaction between the enzyme and the substrate.
Therefore the variables that must be controlled for Maria and Elena results to be valid are the controlled variables which includes Temperature, Amount of light, Humidity, Time.
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The acceleration of a particle is given by a = c1 + c2v, where a is in millimeters per second squared, the velocity v is in millimeters per second, and c1 and c2 are constants. If the particle position and velocity at t = 0 are s0 and v0, respectively, determine expressions for the position s of the particle in terms of the velocity v and time t.
The expression for the position of the particle in terms of velocity and time is given as, s = vt
The given expression:
[tex]a = c_1 + c_2v[/tex]the unit of a = mm/s²the velocity, v = mm/sc₁ and c₂ are constantthe position of the particle at time, t = 0, is s₀ and v₀To find:
The expression for the position s of the particle in terms of the velocity v and time tDetermine the value of the constants from second equation of motion given as:
[tex]s = vt + \frac{1}{2}at^2\\\\substitute \ the \ given \ value \ of \ a\\\\s = vt + \frac{1}{2}(c_1 + c_2v)t^2\\\\s = vt + \frac{1}{2} c_1 t^2 + \frac{1}{2} c_2vt^2\\\\divide \ through\ by \ t^2\\\\\frac{s}{t^2} = \frac{v}{t} + \frac{1}{2} c_1 + \frac{1}{2} c_2v\\\\multiply \ through \ by \ 2\\\\\frac{2s}{t^2} = \frac{2v}{t} + c_1 + c_2v\\\\when \ t = 0\\\\0 = 0 +c_1 + c_2v\\\\c_1 + c_2v = 0\\\\from \ the \ original \ equation;\\\\s = vt + \frac{1}{2} (c_1 + c_2v)t^2\\\\[/tex]
[tex]s = vt + \frac{1}{2}(0)^2\\\\s = vt[/tex]
Thus, the expression for the position of the particle in terms of velocity and time is given as, s = vt
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Schrodinger's cloud model for electrons is an alternate theory to Bohr's orbit model. True or False
Answer:
it's true...
Explanation:
hope it helps you
define about the different types of silk found around the world
Answer:
In short, there are four types of natural silk produced around the world: Mulberry silk, Eri silk, Tasar silk and Muga silk. Mulberry silk contributes around as much as 90% of silk production, with the mulberry silkworm generally being regarded as the most important.
1. Review the data collected in the lab and explain the movement of the cart relative to the reference point(starting point). Be sure to mention how far from the origin the cart gets in each time interval.
2. Review the data collected in the lab and determine the relationship between the position of the car relative to the reference point and the amount of time in each time interval in other words as time goes by how does the position change?
3. For this response he will show your work on calculating the speed of the car during the lab remember you are used to change and slope equation or (y^2-y^1)/(x^2-x^1).
Now let’s make connections to the data table the horizontal variable is the time which we will represent with t and the vertical variable is position which we will represent with an x using this we can rewrite the equation above to the following
(final position - initial position)/
(final time - initial time)
When the data of the position and time are available, the velocity which is the ratio of change in position to change in time which is the same as the slope of the graph of the data can be calculated. For the car, we have;
1. The car moves progressively further as the time interval increases
2. The relationship between the position of the car and the time interval is that the car moves approximately 0.02 units of distance for each change in time of 0.05
3. The speed of the car is 0.398
The reason for arriving at the above values are as follows:
1. From the given data, we have that the cart moves progressively further from the start for each time interval increase, such that the cart moves progressively further from the origin in each time interval increases
[tex]\begin{array}{|c|c|} \mathbf{ Time} & \mathbf{ Position}\\2.2&0.8963\\2.25& 0.9164\\2.3 & 0.9375\\2.35 & 0.9581\\2.4 & 0.9759\end{array}\right][/tex]
2. From the given data, we have;
At time t = 2.2, the position = 0.8963
At time t = 2.25, the position = 0.9164
The change in position for a change in time from 2.2 to 2.25 is, Δx = 0.9164 - 0.8963 = 0.0201
Similarly, for the change in time from 2.25 to 2.3, which is a change of 0.05 seconds, we have;
Δx = 0.9375 - 0.9164 = 0.0211
The next interval is 2.3 to 2.35, Δx = 0.9581 - 0.9375 = 0.0206
Therefore, the change in the distance from the origin increases by approximately 0.02 for each increase in tome by Δt = 0.05 seconds
3. The slope equation is presented as follows;
[tex]Slope = \dfrac{y_2 - y_1 }{x_2 - x_1}[/tex]
The speed of the car is given by the slope of the distance time graph, where;
The horizontal variable, x, is the time, t (x = t)
The vertical variable, y, is the position, x (y = x)
Based on the given assignment of the variables to the x, and y, variables, we have;
[tex]Slope = Speed = \dfrac{y_2 - y_1 }{x_2 - x_1} = \dfrac{x_2 -x_1}{t_2 - t_1} = \mathbf{\dfrac{Final \ position - Initial \ position }{Final \ time - Initial \ time}}[/tex]
Plugging in the values in the table, we have;
[tex]Speed = \dfrac{Final \ position - Initial \ position }{Final \ time - Initial \ time} = \mathbf{\dfrac{0.9759 - 0.8963 }{2.4 - 2.2}} = 0.398[/tex]
The speed of the car = 0.398
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How many bones does the baby have and why does the baby has more bones than the older ones
Answer:
300
Explanation:
when the baby are born then they would have 300 bones but when they grow they would have 206 cause when they grow that 94 bones would convert into different kind of proton and energy I guess
What is the economical application of change of state of matter
Answer:
Changes of state are physical changes in matter. They are reversible changes that do not change matter's chemical makeup or chemical properties. For example, when fog changes to water vapor, it is still water and can change back to liquid water again.
A student drops a feather off the top a building. The feather averages 1.5m/s while
fluttering to the ground.
Determine all unknowns.
The acceleration with which an object falls through a fluid decreases as the speed of the object increases under gravity, to the point where the speed becomes constant, which is known as the terminal speed of the object
The unknown parameters are the mass of the feather, the density of the air, the feather's projected area and the coefficient of drag
The reason the above selected parameters are the correct unknowns is as follows;
The known parameter;
The speed of the feather the student drops off the building's top = 1.5 m/s
The required parameter;
The unknown parameters
Method;
Determine the terminal velocity parameters of the feather
The terminal velocity, [tex]\mathbf{V_t}[/tex], of an item is the maximum steady speed the item reaches as it falls through a fluid. The terminal velocity of the feather is given by the following equation
[tex]Terminal \ velocity, V_t = \mathbf{\sqrt{\dfrac{2 \cdot m \cdot g}{\rho \cdot A \cdot C_d} }}[/tex]
Where;
[tex]\mathbf{V_t}[/tex] = Terminal velocity = The constant speed of the feather
m = Mass of the feather
g = Gravitational acceleration
ρ = Air density
A = The feather's projected area
[tex]C_d[/tex] = Drag coefficient
The average speed of the feather = 1.5 m/s = The feathers typical or most common speed = The terminal velocity of the feather, [tex]\mathbf{V_t}[/tex];
Plugging in [tex]\mathbf{V_t}[/tex] = 1.5 m/s gives;
[tex]V_t = 1.5 \ m/s = \mathbf{\sqrt{\dfrac{2 \cdot m \cdot g}{\rho \cdot A \cdot C_d} }}[/tex]
Therefore, the unknown parameters with regard to the feather falling are the parameters that are to be specified, including;
The mass of the featherThe density of air at the locationThe feather's projected areaThe drag coefficientLearn more about terminal velocity here:
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Slove these problem physics
Answer:
element name = neon
no of proton = 10
no. if neutron = 9
atomic no. = 10
atomic weight = 20.17179u
it lies in group 18 and period 2
it is nonmetal because it is a noble gas .
hope this helped you ☺️
Help would be very appreciated :)
Answer:
c. is the answer i think
Explanation:
Answer:
d. is the the naswer I'm sure with it and not much sure but it would be ryt option
what occurs at the end of a negative cell if an electric cell is placed in a closed circuit?
1. Current means flow of electrons and electrons are negative charged and so are attracted to the positive end of the battery and repelled by the negative end.
2. When battery is connected in a circuit that lets the electron flow through it, they flow from negative to positive.
3. When negative terminal of cell is connected to other negative terminal of the cell in a particular circuit then, current will not flow in circuit as electrons cannot flow from negative to negative terminal.
What is Measurement?
Answer:
Measurement is a comparison of an unknown quantity with a known fixed quantity of the same kind. The value obtained on measuring a quantity is called its magnitude. Magnitude of a quantity is expressed as numbers in its units.Explanation:
measurement is necessary to express the amount or rate of any physical quantity
Q=U+pV solve for p please
Answer:
Q = U + pv
Q - U = pv
(Q - U) / v = p
Name the type of forces involved in the following situations:
a) A rolling ball stops after covering some distance.
b) A magnet attracts a piece of iron.
c) Every object in the universe is attracted to each other.
Answer:
a. Frictional force
b. Magnetic force
c. Gravitational force
Answer:
frictional force
magnetic force
gravitational force
hope this helps!
True or false: the largest planet in the solar system is saturn
Answer:
nope! it's actually Jupiter
Explanation:
Jupiter is your answer
BRAINLIEST PLS HELP
Imagine that you tested 20 high school students (15 male, 5 female). Twelve males and four females reported feeling a calming effect after exposure to the color blue.
In two to three sentences, explain what conclusions could be drawn from this information.
Answer:
Answer:
Explanation:
It means that out of 20 students, 3 males and 1 female were digital screen addicts because they were getting dangerous amount of blue light. Thus couldn't feel calming sensation that a human feels while seeing blue light. The rest students were getting balanced blue light. So they were getting relaxed feeling while being exposed to blue light.
14 km = m on conversions using a ladder method
Physical Science Essential Question: How can the scientific process be used to help us investigate and understand natural phenomena? Elaborate: Challenge students to pretend they are on the scientific journey to develop a vaccine to stop the zombie apocalypse and they need to design an experiment as a result of working in a laboratory. Ask the students to write 2-3 paragraphs describing what they would test and why might this be important in science and the real world. They might need to include the following terms: Experimental design
Test variable
•Outcome
•Control variable
•Hypothesis
•Testable
•Graphs and charts
Answer:
It C 100% bc i alrweady learn this
if a body covers a distance of 25m in a straight line in 5sec ,calculate the averge velocity of the body
Displacement (s)=25m
Time taken (t)=5 sec
Average Velocity (v)= ?
now,
v= d÷ t
v= 25m÷ 5
v= 5m/s
Answer:
[tex]displacement= 25m \\ time = 5 \: sec \\ avarage \: velocity = \frac{displacement}{time} \\ = \frac{25}{5} = 5 \frac{m}{sec} \\ thank \: you[/tex]
How long would it take a runner to go 5000 meters at a speed of 5 meters per second.
[tex]\\ \sf\longmapsto Speed=\dfrac{Distance}{Time}[/tex]
[tex]\\ \sf\longmapsto Time=\dfrac{Distance}{Speed}[/tex]
[tex]\\ \sf\longmapsto Time=\dfrac{5000}{5}[/tex]
[tex]\\ \sf\longmapsto Time=1000s[/tex]
Metallic bonds are responsible for many properties of metals, such as conductivity. Why is this possible? (1 point)
Metals have low electronegativity, so they are conductive because they pass charges easily.
An attraction between a positive charge and a negative charge is created.
O The bonds can shift because valence electrons are held loosely and move freely.
OTwo metals bonded together are going to be more conductive than a metal bonded with a nonmetal.
Answer:
The bonds can shift because valence electrons are held loosely and more freely
Explanation:
Please give brainliest if you can,have a good day<3 :)
Answer:
The bonds can shift because valence electrons are held loosely and move freely.
Explanation: got it right
Which information about an atom can a period number give you?(1 point)
how many energy levels it has
the number of valence electrons it has
how many bonds it will make
the ionic charge it forms
Answer:
How many energy levels it has
The period to which an atom belongs can tell how many energy levels it has.
The period table of an element are categorised into horizontal rows (periods) and vertical columns (groups).
Each elements falls under a particular row (i.e period) and column (i.e group).
The group number talks about the number of valence electron(s) in the outermost shell of the atom while the period number talks about the number of energy levels (or number of shells) the atom has.
This is the most reason why elements in the same group have the same number of valence electron(s) while elements in the same period have the same number of energy levels
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what is the value of acdeleration due to gravity on the surface of the moon and on the surface of the eatrh
Answer:
Explanation:
moon is 1.6metre per second and earth is 9.8 meters per second square
Have a nice day bye
en and Karen are travelling for the weekend. They both leave from Jen's house and meet at their destination 250 miles away. Jen drives 45mph the whole way. Karen drives 60mph but leaves a half hour after Jen. How long does it take for Karen to catch up with Jen
Answer:
1 1/2 hours. for Karen to catch Jen.
Explanation:
Karen needs to make up 22.5 km which is the distance Jen travels in 1/2 hour.
The distance where they meet must be equal from the starting point.
Jen
Jen is out 1/2 hour longer.
Let the Karen's time = t
d = r * t
d = 45 * (t + 1/2 hour)
Karen
d = 60 * t
The distances are equal
so
Meeting time
45*(t + 1/2 hour) = 60 * t
45t + 22.5 = 60t Subtract 45t from both sides
22.5 = 15t Divide by 15
t = 22.5 / 15
t = 1 1/2 hours = 1.5 hours.
Now you have to interpret the results.
Remember that Jen has travelled 1/2 hour more than Karen
Her time is 2 hours.
Karen's time is 1.5 hours.
Jen travels 2 hours which is 2 * 45 = 90 miles
Karen travels 1 1/2 hours which is 1.5 * 60 = 90 miles
Which term describes the repeated arrangement of the same molecule? (1 point)
O molecular model
O atoms
O bonds
o extended structure
The term which best describes the repeated arrangement of the same molecule is: D. extended structure.
An atom can be defined as the smallest unit which comprises the matter that forms all chemical elements. Thus, atoms are typically the fundamental building blocks of matter and as such determines (defines) the structure of a chemical element.
Generally, atoms are typically made up of three (3) distinct particles and these are;
Protons.Neutrons.Electrons.In Chemistry, a molecule can be defined as a group of two or more atoms that are chemically bonded together by means of shared electrons and represents the smallest fundamental unit of a substance or chemical compound.
Basically, when the same molecule are arranged repeatedly it is typically referred to as an extended structure.
In conclusion, the term which best describes the repeated arrangement of the same molecule of a chemical compound or substance is an extended structure.
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Pls answer this quastion
A ____________ is the smallest functional and structural unit of all living organisms.
An ___________ is any living thing that carries out its own life processes.
____________ was the first to describe cells. He looked at the bark of a cork tree under a microscope.
Why are most cells small?
Cells are small because their size is __________ by their outer barrier.
As the cell grows, they will require _______ nutrients and produce ______ waste products.
If cells get too large, they cannot take in ________ nutrients or get rid of enough wastes.
The __________to _________ ratio of a cell is the ratio of the outer surface to the cell’s volume.
The ________ the cell, the ________ this ratio.
What is cell theory?
The cell theory lists three basic characteristics of all cells and organisms.
________________________________________________________
________________________________________________________
________________________________________________________
Notable scientists:
Robert Hooke was the first to describe cells. He looked at the bark of a cork tree under a microscope.
_____________________ was the first to describe living cells.
_____________________ concluded that all plants are made of cells
_____________________ determined that all animal tissues are made of cells
_____________________ proposed that cells could form only from the division of other cells
Which theory does this fall under? ______
______________ organisms
Multicellular organisms
Made up of one cell
Made up of _____ than one cell
The single cell must carry out all life functions
These organism have _____________ cell functions
Describe the differences between the two types of cells.
Prokaryotes
Eukaryotes
_____________________
_____________________
_____________________
DNA is found in the __________________
_____________________
_____________________
_____________________
DNA is found in the _____________________
Answer:
1. Cell
2.Cells
3.Robert Hooke
plz help i will mark brainlyist.
describe how gravitational force is related to mass and distance
compare the magnitude and range of the four basic forces—gravitational, electromagnetic, weak nuclear and strong nuclear
Answer:
please mark me brainliest
Explanation:
Gravitational force -an attractive force that exists between all objects with mass; an object with mass attracts another object with mass; the magnitude of the force is directly proportional to the masses of the two objects and inversely proportional to the square of the distance between the two objects.
The Four Fundamental Forces of Nature are Gravitational force, Weak Nuclear force, Electromagnetic force and Strong Nuclear force. The weak and strong forces are effective only over a very short range and dominate only at the level of subatomic particles. Gravity and Electromagnetic force have infinite range.
Critical Thinking If there is a difference
between a substance's atomic number and
its atomic mass, which measure must be the
larger number?
what do you think the benefits of nuclear energy are
The benefits of nuclear energy should involve less energy cost, accurate, release zero emissions of carbon, cost-effective, etc.
The information related to nuclear energy is:
It is to used for nuclear reactions in order to generate electricity.Nuclear power could be received from nuclear fission, decay, and its reactions.The majority of electricity should be generated via nuclear fission of both uranium & plutonium for nuclear power plants.Therefore we can conclude that The benefits of nuclear energy should involve less energy cost, accuracy, release zero emissions of carbon, cost-effective, etc.
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a heat engine gives out 400J of heat energy as the useful work.calculate the energy given to it as input if its efficiency is 40%?
Answer:
E(efficiency) = E(out) / E(in)
.4 = 400 J / E (in)
E (in) = 1000 J
Heat input : 1000J
What is efficiency of a heat engine ?
The efficiency of a heat engine is defined as the ratio of work done by the heat engine absorbed per cycle.
Given : work output = 400 J
Efficiency = 40 % = 0.4
heat input = ?
Efficiency = work output / heat input
0.4 = 400/heat input
heat input : 1000J
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What is the name given to a celestial object with a known brightness, used to establish distances in astronomy?