Answer:
A control variable is any factor you control or hold constant during an experiment and a negative control group is a control group that is not exposed to the experimental treatment or to any other treatment that is expected to have an effect
A train slows down as it pulls into a station. if the train is moving from your left to your right, what are the directions of the vectors for velocity and acceleration?
The directions of the vectors for velocity and acceleration are in the opposite directions.
The velocity vector is always in the direction of motion of the object. So, the direction of velocity is in the right from our point of view.When there is a positive acceleration in the object the acceleration vector is in the direction of motion of the object. When there is a negative acceleration in the object the acceleration vector is in the opposite direction of motion of the object. So, the direction of velocity is in the left from our point of view.Velocity vector is the rate of change of position of an object. Acceleration vector is the rate of change of velocity of an object.
Therefore, the directions of the vectors for velocity and acceleration are in the opposite directions.
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As shown in the figure below, a seal and shark are playing a fun game of tag. The seal swims
leftward 10 m then dodges rightwards another 20 m. The seal swims a total time of 6
20m
10m
What is the seal's average velocity during the chase?
What is the seal's average speed during the chase?
The seal's average velocity during the chase is 1.67 m/s.
The seal's average speed during the chase is 5 m/s.
What is average velocity?
The average velocity of an object is the change in the displacement of the object with time.
The seal's average velocity during the chase is calculated as follows;
Δx = xf - xi
Δx = 20 m - 10 m = 10 m
v = Δx/t
v = 10 m / 6 s
v = 1.67 m/s
Average speed of the sealThe average speed is the ratio of total distance to total time of motion.
v = (10 m + 20 m) / 6 s
v = 30 m / 6s
v = 5 m/s
Thus, the seal's average velocity during the chase is 1.67 m/s.
The seal's average speed during the chase is 5 m/s.
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As shown in the figure below, a seal and shark are playing a fun game of tag. The seal swims leftward 10 m then dodges rightwards another 20 m. The seal swims a total time of 6 s.
Answer:
What is the seal's average velocity during the chase?
Answer: 1.67 m/s
What is the seal's average speed during the chase?
Answer: 5 m/s
You are looking at yourself in a plane mirror, a distance of 3 meters from the mirror. your brain interprets what you are seeing in the mirror as being a person standing ______ meters from you.
You are looking at yourself in a plane mirror, a distance of 3 meters from the mirror. your brain interprets what you are seeing in the mirror as being a person standing 6 meters from you.
CalculationThe plane mirror shows an exact replica of the real world. that means the distance of you from the mirror is the same distance as your reflection form the mirror at the opposite side of the mirror.
Thus, distance of image from the plane mirror is same as the distance of object (person) from the plane mirror but the image is formed behind the mirror.
Thereby we have v=u=3 m
Thus, distance between image and the person
is d = v + u = 3 + 3 = 6 m
Thus, the person is 6 meters away from the image.
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Calculate the wavelengths in air at 20∘c for sounds in the maximum range of human hearing. The speed of sound in air is 343 m/s.
The wavelengths in air is 8.8x10^-6 m for sounds in the maximum range of human hearing.
Wavelength is the distance between identical points (adjacent crests) in the adjacent cycles of a waveform signal propagated in space or along a wire.
The following equation can be used to compute wavelength: wavelength = wave velocity/frequency. In most cases, wavelength is measured in metres. Greek letter lambda is used to represent wavelength, so = v/f.
speed = wavelength x frequency or wavelength = speed / freq
for f = 20Hz, wavelength = 343m/s / 2.0 x 10^1 Hz = 17.2m
for f = 20,000 Hz, wavelength = 343m/s / 20,000Hz = 0.017 m
39MHz = 39x10^6 Hz so wavelength = 343m/s / 39x10^Hz = 8.8x10^-6 m
Hence, the wavelengths in air is 8.8x10^-6 m
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Stare at a piece of bright colored paper for 45 seconds or so. then look at a plain white surface. what do you see?
Your blue receptors will become fatigued if you stare at a blue image for too long, and the afterimage will be the opposite colour: orange.
Why do we first perceive blue and then yellow?A yellowing of the optical medium of the eye causes Xanthopsia, a colour vision impairment in which blue dominates in perception. Digoxin's inhibition of the sodium pump as well as cataract formation, which can have the effect of a yellow filter, are the most frequent causes.
A blue-green, or cyan, afterimage of the same size and form can be seen if you stare at a red item and then look at a white region shortly after.
Digibind or Digifab, also known as digoxin-specific antibody antigen-binding fragments (DSFab), are a potent antidote that binds digoxin directly.
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What tools would u bring if u were lost in forest to survive?
Explanation:
two strings fire sticks water
Answer: i would bring a flashlight, cans of food , water filter, swiss army knife, rope, and a radio
Explanation:
An electron travels 3.31 m in 5.83 x 10 to the -8 s. How fast is it traveling?
Speed of electron with which it is traveling is
0.56 x 10^8 m/s
It is given that
distance travelled by electron is 3.31 m
time taken to travel = 5.83 x 10^-8 s
We have to find Speed of electron with which it is traveling
Velocity is the pace and direction of an object's movement, whereas speed is the time rate at which an object is travelling along a path. In other words, velocity is a vector, whereas speed is a scalar value.
Speed = distance/time = 3.31/5.83 x 10^-8
Speed = 0.56 x 10^8 m/s
Hence, Speed of electron with which it is traveling is 0.56 x 10^8 m/s
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A bike accelerates from rest at 4 m/s/s. what is the velocity 3.5 s after the bike starts moving?
A car can go from 0 to 60 mph in 6.0 s .assuming that it could maintain the same acceleration at higher speeds, how long would it take the car to go from 0 to 120 mph?
The time taken for the car to reach 120 mph speed is 12 seconds.
Acceleration of the carThe acceleration of the car is the rate of change of velocity of the car with time.
a = Δv/t
where;
t is time = 6 sa = (60 mph) / (6 s)
when the speed increases to 120 mphThe time of motion at the given constant speed is calculated as follows;
t = v/a
t = (120 mph) / (60 mph / 6s)
t = (120 mph x 6 s) / (60 mph)
t = 2 x 6 s
t = 12 seconds
Thus, the time taken for the car to reach 120 mph speed is 12 seconds.
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a skateborder traviling at 7.0m/s/s rolls to a stop at the top of a ramp in 3.0 seconds what is the skateborder's acceleration?
Answer:
-2.33 m/s^2
Explanation:
initial speed u = 7m/s
final speed v= 3s
acceleration a = (v-u)/t
a= -7/3= -2.33 meter per second square.
What happens to most of the neutrinos produced by the nuclear reactions in the core of the sun? group of answer choices
The neutrinos produced by the nuclear reactions in the core of the sun escape from the sun into space.
The neutrinos produced by the nuclear reactions in the core of the sun is called solar neutrinos. These solar neutrinos are the decay product of nuclear fusion reaction in the sun.
These neutrinos then gets released into space which also reaches earth as light and heat.
Therefore, the neutrinos produced by the nuclear reactions in the core of the sun escape from the sun into space.
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If an elevator is accelerating upward, in which direction is a passenger in the elevator accelerating.
They are not accelerating
Upward
Downward
Falling
The illustration shows a class one lever, which is being used to lift an object with a weight of 8 Newtons.
4m
What is the output force of this lever?
2 N
The output force of the given lever is determined as 32 Joules.
What is output force?
The output force of an object is the product of load or weight of an object being lifted and distance through which the load moves.
The output force of the given lever is calculated as follows;
Output force = Load x distance moved load
Output force = 8 N x 4 m
Output force = 32 Joules
Thus, the output force of the given lever is determined as 32 Joules.
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A mass suspended from a spring bobs up and down one complete cycle every 2 s. its period is?
The period is 2 seconds.
A period is a time taken to make one simple harmonic motion. It can be described as time divided by how many waves do. We can write the period formula as
T = t / n
where T is period, t is time and n is the amount of simple harmonic motions.
From the question above, we know that the mass travel up and down, it means that the cycle is one simple harmonic motion.
n = 1
t = 2s
Hence
T = t / n
T = 2 / 1
T = 2 second
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An object weighing 1.840 kg has a volume of 0.0015 m 3. what is the density of the object in g/cm3?
Answer:
1,226,666.6666 g/cm3
Explanation:
Density =Mass/Volume
=1.840 kg(×1000g) / 0.0015
=1,226,666.6666666 g /cm3
i need help please thanks
The burning of fossil fuels is a threat to the environment.
What is pollution?The term pollution has to do with the introduction of harmful material and energy into the environment. We know that the burning of fossil fuels is one of the chief sources of pollution in the environment. This is can be seen from the images attached.
The burning of fossil fuels introduces carbon dioxide into the environment which in turn causes the temperature of the earth to rise. This is the situation that we call global warming.
The greatest concern of the earth is to ensure that the carbon burden is reduced and that the emission of the carbon to the atmosphere is mitigated in order to reduce the impact of this carbon on the earth.
Thus, the burning of fossil fuels is a threat to the environment.
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Definition of covalent compound?
Answer:
Explanation:
Covalent, or molecular, compounds are formed when two nonmetals react with one another. By sharing electrons, the elements combine to form a compound, resulting in an electrically neutral molecule. Covalent Compounds Gilbert N. Lewis, an American physical chemist, first described covalent bonding in a 1916 article, though he did not use the term.
How did planck find the correct curve for the specturm of light emitted by a hot obkect?
Planck find the correct curve for the specturm of light emitted by a hot object by vibrational energies of the atomic resonators were quantized.
Briefing :The energy density of a black body between λ and λ + dλ is the energy E=hc/λ of a mode times the density of states for photons, times the probability that the mode is occupied. This is Planck's renowned equation for a black body's energy density. According to this, electromagnetic radiation from heated bodies emits in discrete energy units or quanta, the size of which depends on a fundamental physical constant (Planck's constant). The basis of infrared imaging is the correlation between spectral emissivity, temperature, and radiant energy, which is made possible by Planck's equation.Learn more about the Planck's constant with the help of the given link:
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with what speed do the molecules move towards the piston if it moves down?
The volume of the space would decrease if the piston were to quickly move out, and the process would then reverse itself, taking another hundredth of a second to complete before everything was back to normal. The time it takes for the molecules to balance out is constant, regardless of how quickly or how far the piston is driven.
In mechanical engineering, a piston and cylinder are two sliding cylinders with closed heads that move reciprocally within a somewhat larger cylindrical chamber under pressure from a fluid, as in an engine or pump. The piston rod, which is rigidly coupled to the piston, can pass through one of the end cover plates of a steam engine's cylinder, which is closed by plates at both ends, using a gland and stuffing box (steam-tight joint).
An internal combustion engine's cylinder is open at one end to allow the connecting rod, which connects the piston to the crankshaft, to freely oscillate and is closed at one end by a plate known as the head.
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A mechanic working on a 100-m radar tower drops a hammer weighing 44.5 n. the work done on the hammer as it falls is:________
A 44.5 n hammer falls from a 100 m radar tower being repaired by a mechanic 4450 J worth of work is done on the hammer as it falls.
Briefing:Work= Force *Distance
= 44.5*100
= 4450 J.
What Is Distance?Distance is a measurement of the distance between two objects or location. In physics, the term "distance" can refer to an actual length or, more commonly, to an estimate based on several other parameters. The sign |AB| may occasionally be used to denote a distance between two places.
What is the formula for calculating distance?To calculate the distance, use the formula d = st, or distance equal speed multiplied by time.
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A chemical process with an e-factor of 1 creates less waste than an e-factor of 25?
The statement given "A chemical process with an e-factor of 1 creates less waste than an E-factor of 25" is True.
E factor :The E factor takes into account all waste that may be classified as trash, including byproduct waste, residual reactants, solvent losses, spent catalysts and catalyst supports, and any other waste that can be classified as waste. The computation is based on the definition of waste. Since water is typically safe and a considerable byproduct of many chemical processes, its bulk is typically excluded from the calculation of the total mass of waste. Higher E values are generally less desirable and 0 is the ideal E factor. The volume of product produced and the product's value determine the e variables that may be tolerated. Tolerable E factors for bulk chemicals generated in quantities ranging from hundreds of thousands to millions of tons per year typically fall between 1 and 5.Learn more about the Green chemistry with the help of the given link:
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A wire rope sling with a strength of 10,000 pounds and a total working load of 2,000 pounds has a design factor (multiplier) of ___.
The design factor or multiplier of the wire rope is 5.
What is design factor?
Design factor means the ratio of the ultimate failure strength of a member or piece of material or equipment to the actual working stress or intended safe load.
The design factor or multiplier of the wire rope is calculated as follows;
D.F = maximum strength / load
D.F = 10,000 / 2000
D.F = 5
Thus, the design factor or multiplier of the wire rope is 5.
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Three liquids have densities of 1.15 g/ml, 0.79 g/ml and 0.95 g/ml. when the liquids, which do not mix, are poured into a graduated cylinder, the liquid at the top is the one with a density of:________
The liquid at the top is the one with a density of 0.79 g/ml.
The matter with most density will stay at the bottom of the graduated cylinder. So when comparing the three given densities of 1.15 g/ml, 0.79 g/ml and 0.95 g/ml, the lowest density is 0.79 g/ml.
Density is nothing but weight of the matter. So basically the lighter one stays at top.
Therefore, the liquid at the top is the one with a density of 0.79 g/ml.
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What type of boundary is depicted in the image below?
a.
transform
b.
collisional
C.
convergent
d.
divergent
Compare the melting point and the melting temperature range of a pure substance and an impure substance. for a pure substance, the melting temperature range is:________
For a pure substance, the melting temperature range is low
The melting point range is widened as a result of impurity addition, which lowers the melting point. The melting point range is reduced because pure substances have greater melting points.
The typical definition of the melting point is the temperature at which a substance transforms from a solid to a liquid.
The melting point of a liquid is the temperature at which the liquid transforms from a solid to a liquid under atmospheric pressure. This is the location where the liquid and solid phases are equally present.
By placing a tiny amount of an organic solid into a tiny capillary tube, affixing it to the stem of a thermometer centred in a heating bath, slowly heating the bath, and observing the temperatures at which melting begins and is complete, it is possible to determine the melting point of an organic solid.
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What would be the average fixed cost per unit at an activity level of 5,200 units? assume that this level of activity is within the relevant range.
The average fixed cost per unit at an activity level of 5,200 units is $6.00.
What is the average fixed cost?The average fixed cost (AFC) is fixed cost that does not change with the change in the number of goods and services produced by a company. To put it in a nutshell, average fixed cost (AFC) is the fixed cost per unit and is calculated by dividing the total fixed cost by output level.
Since no cost is fixed for a long time, average fixed cost is only for a short run. When units of production increase, the average fixed cost per unit decreases. Similarly, when the business produces less units, average cost increases per unit.
However, only one unit, mostly capital, is fixed. Examples of average fixed cost are the salaries of permanent employees, mortgage payment on machinery and plant, rent, more.
Average Fixed Cost Formula:
AFC = Total fixed cost/Output (Q)
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What is the correct number of p orbital electrons in cyclopentadienyl anion?
a) 6
b) 2
c) 5
d) 4
The number of p - orbital electrons in cyclopentadienyl anion are
6 electrons.
We have Cyclopentadienyl anion.
We have to determine number of p - orbital electrons in it.
What are Orbitals ?Atomic orbitals are the 3-dimensional spaces around the nucleus where the probability of finding an electron is maximum.
According to the question -
The Cyclopentadienyl Anion is planar and has a continuous overlap of 5 p-orbitals with 6 electrons. It is an aromatic system which is highly stable and has a closed shell configuration. The deprotonated form of cyclopentadiene is represented as the cyclopentadienyl anion C5H5⁻.
Hence, the number of p - orbital electrons in cyclopentadienyl anion are
6 electrons.
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Hi can someone explain me to find the answer of this equation?
I am not able to calculate because there is different units such as kg/m^3,m/s^2
(1000kg/m^3)x(9.8m/s^2)x(1.2m)
I have test tommorow, I will mark you as Brainliest!
Answer:
11760 kg / (m-s^2)
Explanation:
Just do the units FIRST
kg m m
m^3 s^2 1
now you can see that the two m's in the top cancel two m's in the denominator and you are left with
kg/ (m-s^2) as units
Now do the numbers
1000 * 9.8 * 1.2 = 11760
so answer is 11 760 kg / (m-s^2)
The operation of preparing illustrations for enlargement or reduction is known as:_____.
Proportional scale or Proportion wheel are terms used to describe the process of preparing illustrations for expansion or reduction.
A proportionate scale is a logarithmic scale with indicated portions that are proportional to the natural number logarithms.Graphic designers utilize a traditional proportion wheel, often known as a proportion scale, to adjust an image to fit within a specified width (or height).In general, the goal is to keep the same aspect ratio while translating a picture with a specific width and height to prevent distortion.What is the proportional principle?
The relationship between two or more elements in a design and how they stack up against one another is known as proportion. When there is a proper size or quantity relationship between the elements, proportion is said to be harmonic.
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The vernal equinox is now just entering the constellation aquarius. In what constellation will it lie in the year a. D. 10000?.
The vernal equinox in the year AD 10000 will lie in the constellation Scorpio.
Once every 25800 years a full cycle of precession is completed. There are 12 constellations which means it takes 25800 / 12 = 2150 years to move from one constellation to the next one. The order in which the vernal equinox moves from Aquarius is Capricorn, Sagittarius, Scorpio, Libra etc.
Now the year is 2022 AD where the vernal equinox just entered constellation Aquarius. In 4172 AD it would have entered constellation Capricorn, then constellation Sagittarius in 6322 AD, then constellation Scorpio in 8472 AD and then constellation Libra in 10622 AD. This means that in 10000 AD it is still in constellation Scorpio and yet to enter constellation Libra.
Therefore, In the year 10000 AD, the vernal equinox will lie in the constellation Scorpio.
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