The 2.4 m measurement of a plank might be inappropriately reported if the meter rule used doesn't have the precision to report to tenths of a meter. The proper reporting of a length measurement should match the precision of the measurement tool, and include any measurement uncertainty using significant figures.
Explanation:The reading of the length of a plank measured as 2.4 m may be inappropriately reported if the measuring instrument, such as the meter rule, is not precise enough to report the measurement to the nearest tenth of a meter. When measurements yield inexact numbers, it's important to report them to the appropriate degree of precision based on the measuring tool used. A common meter stick may not have the necessary granularity to estimate beyond whole centimeters effectively, and therefore, reporting the length to a precision of tenths of a meter, like 2.4 m, might not be possible. If the meter rule used only has markings for each centimeter, the more appropriate reading would be to the nearest whole centimeter. It's also vital to include measurement uncertainty when expressing measurements, as suggested by the principles of significant figures.
Furthermore, while a meter stick is useful for measuring objects that are a few meters in length, for larger measurements, different units like kilometers might be used. For smaller measurements, centimeters or millimeters are more appropriate. The standard unit of length in the SI system is a meter, which is suitable for measuring everyday objects, like furniture or components of a small structure such as a doghouse. When a more granular measurement is required, millimeters (mm) or centimeters (cm), which are subdivisions of a meter, are used.
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Ken’s community is completely dependent on agriculture for their income. They cultivate and breed domestic species for their food. Ken lives in which society?Ken’s community is completely dependent on agriculture for their income. They cultivate and breed domestic species for their food. Ken lives in which society?Ken’s community is completely dependent on agriculture for their income. They cultivate and breed domestic species for their food. Ken lives in which society?
Ken lives in an agricultural society where his community engages in farming and animal domestication for subsistence and income. The community is settled, which contrasts with nomadic hunter-gatherer or pastoral societies, and revolves around horticulture or intensive agriculture.
Explanation:Ken lives in an agricultural society. This type of society is rooted in farming and domestication of animals for subsistence and income. With settled communities, Ken's society has shifted from the nomadic lifestyle of hunter-gatherer or pastoral societies to a more stationary form of living where they cultivate land and breed domestic species for food. As agriculture allows for surplus production, it also enables the development of specialized occupations, trade, and the creation of settled villages, which can develop into more complex sociopolitical structures.
In Ken's community, where extensive horticulture or intensive agriculture is practiced, members of the community may be part of a peasant class in their nation-states, working small plots of land within a larger regional economy. Despite the advancements that technology brings to smooth out the harshness of existence, such societies are dependent on their environmental ecosystems, and any changes to them can significantly impact their way of life.
Suppose a vector V makes an angle ϕ with respect to the y axis. Part A What could be the x and y components of the vector V ? Express your answers in terms of the variables V and ϕ separated by a comma.
The variables in the terms of V and ϕ separated by a comma are Vx = v sin phi, Vy = V cos phi
What are vectors?A quantity or phenomenon with independent qualities for both magnitude and direction is called a vector. The term can also refer to a quantity's mathematical or geometrical representation.
The vector V makes an angle with the Y axis, as indicated by the question.
Calculating the x component and y component, which stand for the horizontal and vertical components, is required. Take into consideration a two-dimensional coordinate system with two perpendicular axes, the X and Y axes.
The Y axis and the vector V are at an angle θ. Let's use the symbols for the x and y components, Vx and Vy respectively.
Therefore, the variables are Vx = v sin phi, Vy = V cos phi.
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Kinetic energy and mass are____ proportional.
Answer:
Kinetic energy and mass are directly proportional.
Explanation:
The kinetic energy of an object is given by:
[tex]K=\frac{1}{2}mv^2[/tex]
where
m is the mass of the object
v is the speed of the object
From the equation above, we see that the kinetic energy (K) depends linearly on the mass (m), so kinetic energy and mass are directly proportional to each other.
URGENT!
What makes some collisions elastic and and other inelastic?
A. If the collision involves bouncing, it is elastic.
B. If the collision involves sticking together, it is elastic.
C. If there is no loss of kinetic energy, it is elastic.
D. If there is energy lost in the collision to sound, heat, etc., the collision is elastic.
look at me answering a question from 2017 its 2021 \(^o^\) (/^o^)/
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C is correct tho I just took the test '^'
Why do elements within a group have similar chemical properties
Elements in the same group of the periodic table have similar chemical properties because they have the same number of valence electrons.
Explanation:The elements in the same group of the periodic table have similar chemical properties because they have the same number of valence electrons. Valence electrons are the outermost electrons in an atom, and they determine how the atom will react with other atoms. For example, elements in Group 1 (alkali metals) all have one valence electron, so they tend to lose that electron and become positively charged ions. Similarly, elements in Group 17 (halogens) have seven valence electrons, so they tend to gain one electron and become negatively charged ions.
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which of the following best describes gravity
a molecular pull
a description of mass
a fundamental force
a kind of acceleration
Answer:
a fundamental force is the correct answer.
Explanation:
gravity is a fundamental force that attract two objects towards each other.
fundamental forces that work among elementary bodies and that are mediated by more than one particle.
There are four types of fundamental force
strong forceWeak forceelectromagnetic forcegravitational force.Gravity is the weakest force.
You can calculate the acceleration of an object moving on a straight line by dividing the blank by the time.
How might you cause an endothermic Chemical change to begin keep going?
URGENT!!
What makes some collisions elastic and others inelastic?
A. If there is energy lost in the collision to sound, heat, etc., the collision is inelastic.
B. If there is no loss of kinetic energy in the collision, it is inelastic.
C. If the collision involves bouncing, it is elastic.
D. If the collision involves sticking together, it is elastic.
To solve this we must be knowing each and every concept related to collisions. Therefore, the correct option is option A among all given options.
What is collisions?Two items collide when they briefly come into touch with one another. To put it another way, a collision is a brief reciprocal encounter between two masses in which the momentum or energy of the masses change.
Total momentum, total energy, and full kinetic energy are all conserved in an elastic collision. The forces engaged in the brief encounter are preserved in nature, therefore the entire mechanical energy also isn't changed into a different energy type. If there is energy lost in the collision to sound, heat, etc., the collision is inelastic.
Therefore, the correct option is option A.
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discuss the difference between molarity and molality, state the units of each, state the symbol of each, and give an example of how each can be used when you are determining the concentration of a solution
Final answer:
Molarity, symbolized by M, is the moles of solute per liter of solution and is useful for stoichiometric calculations. Molality, symbolized by m, is the moles of solute per kilogram of solvent and is beneficial for temperature-dependent calculations like boiling point elevation. Both have distinct units, molarity in mol/L and molality in mol/kg.
Explanation:
The difference between molarity and molality lies in their definitions and units of measurement. Molarity, denoted by the symbol M, is a measure of concentration defined as the number of moles of solute per liter of solution (mol/L). It is commonly used in chemistry to discuss reactions where solute is a reactant or product, allowing conversion from moles to grams using molar mass.
On the other hand, molality, represented by the symbol m, is defined as the number of moles of solute per kilogram of solvent (mol/kg). Molality is independent of temperature and pressure because it's based on mass, which is particularly useful when dealing with reactions that involve significant temperature changes. For example, in calculating the freezing point depression or boiling point elevation, molality is used due to its temperature-independent nature.
Example of molarity: To determine the amount of sodium chloride needed to prepare 2 liters of a 0.5 M NaCl solution, you would use the formula M=moles/L and rearrange it to calculate moles = M × L. Therefore, you need 1 mole of NaCl (0.5 moles/L × 2 L).
Example of molality: When calculating the change in boiling point of water with a dissolved non-volatile solute, molality is used to determine the moles of solute per kilogram of water, which can then be plugged into the boiling point elevation formula.
The decomposition of dinitrogen tetraoxide into nitrogen gas and oxygen gas is shown by which balanced chemical equation?
A) N2(g) + 2O2(g) → N2O4(g)
B) N2O4(g) → N2(g) + O2(g)
C) N2O4(g) → N2(g) + 2O2(g)
D) N2O4(g) + 2O2(g) → N2(g)
Answer : The correct option is, (C) [tex]N_2O_4(g)\rightarrow N_2(g)+2O_2(g)[/tex]
Explanation :
Decomposition reaction : It is a type of reaction in which a single compound decomposes into two or more new compounds.
The decomposition of dinitrogen tetraoxide into nitrogen gas and oxygen gas is shown by balanced chemical equation.
The balanced decomposition reaction will be,
[tex]N_2O_4(g)\rightarrow N_2(g)+2O_2(g)[/tex]
By the stoichiometry, 1 mole of dinitrogen tetraoxide decomposes into 1 mole of nitrogen gas and 2 moles of oxygen gas.
Hence, the correct option is, (C)
a school bus travels 15 kilometers in 0.75 hours. What is the speed of the school bus?
A school bus travels 15 kilo-meters in 0.75 hours. The speed of the school bus is 20 Km/h.
What is speed?The speed of an object is the magnitude of the change of its position over time or the magnitude of the change of its position per unit of time; it is thus a scalar quantity.
Given in the question there is a school bus travels 15 kilo-meters in 0.75 hours, So, to find the speed of the school bus
Speed = total distance/ time taken
Speed = 15/ 0.75
Speed = 20 Km/hr
A school bus travels 15 kilo-meters in 0.75 hours. The speed of the school bus is 20 Km/h.
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Final answer:
The speed of the school bus is 20 kilometers per hour.
Explanation:
To calculate the speed of the school bus, we need to divide the distance it traveled by the time it took to travel that distance. In this case, the bus traveled 15 kilometers in 0.75 hours. So:
Speed = Distance / Time = 15 km / 0.75 h = 20 km/h
Therefore, the speed of the school bus is 20 kilometers per hour.
Natural selection. Darwin hypothesized that there requisites for natural selection to occur and that there are definite steps to natural selection. Note the two models seen here. Both of the models illustrate an important requisite for natural selection. That is:
A) sexual reproduction must occur.
B) there is survival of the fittest.
C) variation in the population exists.
D) genetic sameness reduces the chances of natural selection.
Answer:c) variation in the population exists
Explanation:
Answer: C) variation in the population exists.
Explanation:
Based on Darwin, the most important requisite for natural selection is the variance in the genetics of the individuals of some species.
These differences, produced by mutations, may have a positive effect or a negative effect in the life of the subjects, where, statistically, the positive mutations will prevail as the species reproduces.
So the right answer would be C, Variation in the population exists.
A scientific theory _______.
a. Describes what occurs every time in a given situation
b. Is not a validated bu experimentation
c. Can never be changed
d. Is an explanation for a set of events
Aliens from planet Moby have three alleles for skin color: R (red) W(white) and B (Blue). If all of these alleles are codominant and aliens on planet moby can only inherit two alleles for a gene, what are the six possible genotypes for skin color in these aliens?
The aliens from planet Moby can present six possible genotypes resulting from combinations of the three codominant alleles R, W, and B: RR, WW, BB, RW, RB, and WB. Each genotype would result in a unique phenotype, with RW being a mix of red and white, RB a mix of red and blue and WB a mix of white and blue. This is an example of a multiple allele system, which is basic to studying genetics.
Explanation:Because aliens from planet Moby can only inherit two alleles for a gene and all the alleles (R for red, W for white, and B for blue) are codominant, the six possible genotypes would be: RR - for red, WW - for white, BB - for blue combinations like RW - for red and white, RB - for red and blue, and WB - for white and blue. It's worth noting that in this codominant system, each genotype corresponds to a unique phenotype completely different from the others.
For instance, the genotype 'RW' would be expressed as a mix of red and white, 'RB' would be a mix of red and blue, and 'WB' would be a mix of white and blue. Such systems where multiple alleles are controlling a single trait are known as multiple allele systems, and they often display more than just two phenotypes in the population.
Understanding multiple allele systems and codominant systems is a fundamental aspect of the study of genetics. This knowledge helps scientists understand genetic diversity and inheritance patterns among populations more comprehensively.
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A thin, rectangular sheet of metal has mass M and sides of length a and b. Find the moment of inertia of this sheet about an axis that lies in the plane of the plate, passes through the center of the plate, and is parallel to the side with length b.
Which simple machine is best used to split apart an object?
a screw
a lever
a wedge
a pulley
Answer:
c) wedge
Explanation:
1) What would the average acceleration be for a car at a stoplight that speeds up to 20 m/s in 10 seconds (in m/s^2)
2) Imagine that a car traveling at 100 m/s must slam on the brakes to avoid hitting a raccoon. If it takes 4 seconds for the car to slow down to a stop, what is its acceleration (in m/s^2)
Answer:
Part a)
a = 2 m/s/s
Part b)
a = - 25 m/s/s
Explanation:
As we know that the average acceleration id defined as the rate of change in the velocity of the object
so here it is given by formula
[tex]a = \frac{v_f - v_i}{\Delta t}[/tex]
now we know that
[tex]v_f = 20 m/s[/tex]
[tex]v_i = 0[/tex]
[tex]\Delta t = 10 s[/tex]
now we have
[tex]a = \frac{20 - 0}{10} = 2 m/s^2[/tex]
Part b)
here car is travelling with speed 100 m/s
now driver slams brakes and car finally stop in t = 4 s
so the average acceleration is given as
[tex]a = \frac{v_f - v_i}{\Delta t}[/tex]
now we know that
[tex]v_f = 0 m/s[/tex]
[tex]v_i = 100[/tex]
[tex]\Delta t = 4 s[/tex]
now we have
[tex]a = \frac{0 - 100}{4} = -25 m/s^2[/tex]
Is the momentum of a 0.1 kg Mass moving with a velocity of 5 miles per second West
The momentum for the given mass will be 804.6 kgm/s. Momentum is occurring due to the applied force. Its unit is Kg m/s.
What is momentum?The momentum is defined as the product of mass and the velocity of the body. It is denoted by the letter P. It occurs due to the applied force. Its unit is Kg m/s².
The given data in the problem is;
Mass(m)= 0.1 kg
Velocity(v)=5 miles per second =8046.72 m/sec
Momentum = mass × velocity
P=0.1 × 8046.72 m/sec
P=804.6 kgm/s
Hence, the momentum for the given mass will be 804.6 kgm/s
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Final answer:
Momentum is the product of an object's mass and velocity, calculated using the formula Momentum = mass x velocity. In the scenario provided, a 0.1 kg mass moving at 5 miles per second west has a momentum of -0.5 kg*miles/s west.
Explanation:
Momentum is the product of an object's mass and its velocity. It is a vector quantity, meaning it has both magnitude and direction.
To calculate momentum, you can use the formula: Momentum = mass x velocity.
In the given scenario, the momentum of a 0.1 kg mass moving at 5 miles per second west would be 0.1 kg x (-5 miles/s) = -0.5 kg*miles/s west.
How could you increase the power of a wave in a spring? A. Increase the amplitude. B. Increase the frequency. C. Increase the tension on the spring. D. All of the above
The power of a wave measures the amount of energy the wave transmits in per unit time
The correct option that could increase the power of a wave in a spring is option D.
D. All of the above
The reason the selected option is correct is given as follows;
The power of a wave in a string is given by the following equation;
[tex]Wave \ power = \dfrac{1}{2} \cdot \mu \cdot \omega^2 \cdot A^2 \cdot v[/tex]Where;
μ = The string's mass per unit length
ω = The wave's angular frequency
A = The wave amplitude
v = The velocity of propagation of the wave
[tex]v = \sqrt{\dfrac{T}{\mu} }[/tex]
T = Tension in the string
Increasing the power of the wave in a string, can be done by either;
Increasing the wave amplitudeIncreasing the velocity of the wave by increasing the frequency (v = f·λ)The velocity of the wave is increased when the tension is increased, therefore, increasing the tension, increases the power of the wave in a stringTherefore, all the options are correct
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A car increases its speed from 9.6 meters per second to 11.2 meters per second in 4.0 seconds. The average acceleration of the car during this 4.0-second interval is
Because of churning rock and ash, the largest volcanic eruptions are sometimes surrounded by
Large volcanic eruptions are sometimes surrounded by lighting and calderas. That's because the flying ash and rocks rub together producing static electricity. When enough static electricity builds up flash lightning discharges it.
What is Volcanic eruptions ?"A volcano is an opening or rupture in the earth’s surface that allows magma (hot liquid and semi-liquid rock), volcanic ash and gases to escape. "They are generally found where tectonic plates come together or separate but they can also occur in the middle of plates due to volcanic hotspots. A volcanic eruption is when lava and gas are released from a volcano—sometimes explosively. The most dangerous type of eruption is called a 'glowing avalanche' which is when freshly erupted magma flows down the sides of a volcano. They can travel quickly and reach temperatures of up to 1,200 degrees Fahrenheit. Other hazards include ash fall, and lahars (mud or debris flows). Volcanoes often cause population displacement and food shortages.
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Do 3-7 for me? It is science and i hate doing science hw.
Which energy transformation converts energy from the sun’s core to light energy needed by plants?
nuclear to chemical
chemical to thermal
nuclear to electromagnetic
chemical to electromagnetic
Description
Answer:
c nuclear to eletricmagnetic
Explanation:
why did she use an red infra lamp
I need help on both questions
Where does the basketball have the greatest gravitational potential energy?
A neutral atom of potassium (K) has an average mass of 39 amu and 19 electrons. How many neutrons does it have?
Answer:
19
Explanation:
It's just basic stuff
Which of the following do all of the small objects in the four categories (dwarf planets, asteroids, comets, and meteoroids) have in common? A) They all orbit the sun, B) They all have icy compositions, C) They are all less than a kilometer in diameter, D) They are all located in the asteroid belt
Answer: A) They all orbit the sun
Explanation:
Dwarf planets are rocky bodies almost round in shape which orbit the Sun. For example- Pluto and Ceres.
Asteroids are irregular shaped and sized rocky bodies which orbit the Sun. Majority of the asteroids are found in between orbits of Mars and Jupiter.
Comets have rocky surface composed of frozen gases. Comets come from outskirts of solar system. These objects also orbit the sun.
Meteoroids are debris of comets and other celestial objects in the solar system. These meteoroids also orbit the Sun.
Thus, the common characteristic of all the given small celestial objects is that they all orbit the Sun.
imagine riding a single-speed bicycle. why do you have to push harders on the pedals to start the bicycle moving than to keep it moving at constant velocity ?
Pushing harder on the pedals when starting a bicycle is required to overcome inertia and higher static friction compared to the lesser force needed to maintain constant velocity due to rolling resistance and air resistance.
The reason you must push harder on the pedals to start a bicycle moving rather than to keep it moving at a constant velocity is due to inertia and the static friction present when the bicycle is at rest. Starting the bicycle requires enough force to overcome inertia, which is the property of matter that resists changes in its state of motion. Since the bicycle and rider are initially at rest, a greater force is needed to accelerate them to a moving state. Additionally, static friction between the tire and the ground is higher when the bike is stationary. Once the bicycle is in motion, only enough force to overcome rolling resistance and air resistance is necessary to maintain a constant velocity, which is generally less than the force required to start moving from rest.