30 ml= 30 ml- 26 mL 26 mL- 22 ml -22 ml- -B 18 ml 18 ml- 14 mL 14 mL- 10 ml- 10 ml- X The mass of sample X is 20.0g. It was placed in a graduated cylinder and the water level rose from A to B. What is the density of sample X? Pay close attention to significant figures.
Answers
Answer:4.0
Explanation:
Related Questions
what is the materials of seprating salt,sand,iron fillings and beads.(Be specific)
Answers
Explanation:
Generally, materials are separated according to differences in their physical properties. During the separation process, it is important not to chemically change any of the parts of the mixture if possible. This avoids costly chemical processes and loss of material. It is best to try to separate one component at a time, which means that this experiment can be expected to have at least three stages, corresponding to the removal of each component from the mixture.
Physical properties
In this experiment, the three constituent materials in the mixture are solids with significantly different physical properties, which makes separation easier.
Iron is a magnetic solid which is insoluble in water.
Salt is a non-magnetic solid which is soluble in water.
Sand is a non-magnetic solid which is insoluble in water.
IN SPECIFIC:
Iron is magnetic and the other two not, which means a magnet could be used to attract the iron filings out of the mixture, leaving the salt and sand. Salt is water soluble, while sand is not. This means the two can be mixed in water and stirred. The salt will dissolve and the sand willnot.
A machine does 2500 J of work in 1 min. What is the power developed by the machine?
Answers
Answer:
41.7 watts
Explanation:
power=work done/time
2500/60seconds
=41.6666
Mr. Mangan is in freefall on Planet Y. His velocity increases from rest to 30 m/s in 1.2 s. If his mass is 86 kg, what is his weight on Planet Y? What is the gravitational field strength on Planet Y?
Answers
Explanation:
First, we need to calculate the gravitational field strength g on Planet Y. So, we will use the following e
how much work is done by the centripetal force in your investigation 1? when you swing an object in a uniform horizontal circle on a rope over your head are you expending energy and doing work?
Answers
even though the centripetal force does no work, you are expending energy and doing work to keep the object in motion.
In Investigation 1, when you swing an object in a uniform horizontal circle on a rope over your head, the centripetal force does not do any work. The centripetal force is responsible for keeping the object moving in a circular path, constantly changing its direction but not its speed.
Work is defined as the transfer of energy that occurs when a force acts on an object and causes it to move in the direction of the force. In the case of circular motion, the centripetal force acts perpendicular to the direction of motion, towards the center of the circle. As a result, the work done by the centripetal force is zero because there is no displacement in the direction of the force.
However, while swinging the object, you are expending energy and doing work. You are providing the initial energy to set the object in motion and continuously exerting force to keep the object moving in a circular path. This work is done by the force you apply through the rope, which acts tangentially to the circular path.
The work you do transfers energy to the object, maintaining its circular motion. The energy you expend is eventually dissipated as heat due to various factors such as friction in the rope, air resistance, and internal friction within the object itself.
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Could there ever be a situation where a small sports car could have more inertia than a big bus?
Answers
What generates the energy produced when small light atoms are combined into heavier ones
A. Fusion reactions
B. Chemical reactions
C. Fission reactions
D. Nuclear chain reactions
Answers
Answer:
A. Fusion Reactions
Explanation:
“You can’t get more energy from a machine than the amount of energy you put into it,” is one way of stating the law of conservation of _____. A. work B. friction C. energy D. power
Answers
Answer:
Energy
Explanation:
One ways of stating the law of conservation of energy is that "you cannot get more energy from a machine than the amount of energy you put into it".
The law of conservation of energy states that in a system, energy is neither created nor destroyed but transformed from one form to another.
The energy in a system does not increase based on the premise of this law.
The efficiency of a machine can reduce but the energy is always conserved. This is because energy is transformed to other forms.Hosphoric acid, h3po4, has pka values of 2.15, 6.82, and 12.38. what is the charge on the predominant form of phosphoric acid at ph 9.5?
Answers
To determine the charge on the predominant form of phosphoric acid at pH 9.5, we need to consider the pKa values of its ionizable hydrogen atoms.
Phosphoric acid (H₃PO₄) has three ionizable hydrogen atoms, which can be sequentially deprotonated. The pKa values given are 2.15, 6.82, and 12.38.At pH 9.5, we need to determine which ionization steps have occurred and calculate the charge accordingly.Since pH 9.5 is between the pKa values of 6.82 and 12.38, the predominant form will be a mixture of the second and third ionizations.At pH 9.5, the predominant form of phosphoric acid will have lost two protons, resulting in the formation of HPO₄²⁻, which is the conjugate base of H₂PO₄⁻.Therefore, the charge on the predominant form of phosphoric acid at pH 9.5 is 2- (two negative charges) in the form of HPO₄²⁻.
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Use the electron arrangement interactive to complete the table
Answers
The number of electrons that is needed to fill the following sublevels are:
1s = 2 electrons. 2s = 2 electrons. 2p = 6 electrons. 3s = 2 electrons. What is the number of electrons needed to complete the table?The formula to find this out is:
= 2 x (2 x Level +1)
1s = 0 levels
Number of electrons:
= 2 x (2 x 0 + 1)
= 2 electrons
2s = 0 levels
= 2 x (2 x 0 + 1)
= 2 electrons
2p = 1 level
= 2 x (2 x 1 + 1)
= 6 electrons
3s = 0 levels
= 2 x (2 x 0 + 1)
= 2 electrons
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The completed table using the electron arrangement interactive is attached below. In this table for sublevel 1s, 2s, 2p and 3s electron needed is 2,2,6 and 2 respectively.
What is electron arrangement?The electron arrangement is the way or process to arrange the electrons in an atom. The number of electron needed per sublevel are expressed in following points.
The number of electron need to feel sublevel 1s is 2.The number of electron need to feel sublevel 2s is 2.The number of electron need to feel sublevel 2p is 6.The number of electron need to feel sublevel 3s is 2.The image of the table which fill the sublevel is attached below. In this table all the electron is fulfilled with needed electrons.
Thus, the completed table using the electron arrangement interactive is attached below. In this table for sublevel 1s, 2s, 2p and 3s electron needed is 2,2,6 and 2 respectively.
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Nuclei decay from a more stable form to a less stable form.Question 9 options:TrueFalse
Answers
ANSWER
False.
EXPLANATION
In radioactive decay (or nuclei decay), an unstable nucleus emits radiation into a nucleus that is table and has less energy and a lower mass.
Therefore, nuclei decay from a less stable form to a more stable form.
The answer is false.
Without completing the calculations, determine what the new volume will be in the problem below. Also, explain how you were able to determine the new volume without completing the calculations. Pay special attention to how the pressure is changing. An 80.0-mL sample of carbon monoxide gas (CO) is stored at a pressure of x kPa. The pressure is doubled to 2x kPa. What is the new volume?
Answers
Pressure and volume are inversely proportional as the new variable changes from the known.
Double the pressure equals 1/2 of original volume, assuming temperature remains the same.
So 40.0 mL is the new volume as it is compressed.
According to the Boyle's law, as pressure is inversely proportional to volume at constant temperature the the new volume of gas is 40 ml.
What is Boyle's law?Boyle's law is an experimental gas law which describes how the pressure of the gas decreases as the volume increases. It's statement can be stated as, the absolute pressure which is exerted by a given mass of an ideal gas is inversely proportional to its volume provided temperature and amount of gas remains unchanged.
Mathematically, it can be stated as,
P∝1/V or PV=K. The equation states that the product of of pressure and volume is constant for a given mass of gas and the equation holds true as long as temperature is maintained constant.The nature of graph obtained when gas obeys Boyle's law is hyperbolic curve.
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Un móvil viaja inicialmente con una velocidad de 55 m/s, al cabo de cierto tiempo, su velocidad es de 115 m/s, de repente frena bruscamente con una desaceleración de 14, 500 m/s2. ¿qué distancia recorrerá antes de frenar?
Answers
Answer:
Distancia, S = 2.84 metros
Explanation:
Dados los siguientes datos;
Velocidad inicial = 55 m/s
Velocidad final = 115 m/s
Deceleración = 14500 m/s²
Para encontrar qué tan lejos viajaría el automóvil, usaríamos la tercera ecuación de movimiento;
V² = U² + 2aS
115² = 55² + 2*14500*S
13225 = 3025 + 29000S
29000S = 13225 - 3025
29000S = 10200
S = 29000/10200
Distancia, S = 2.84 metros
.) Explain what an indepent variable is
Explain what an
dependent variable
Answers
Answer:
An independent variable is a variable that stands alone and isn't changed by the other variables you are trying to measure.
A dependent variable is something that depends on other factors.
which one is deposition plz help
1. Your wet hair dries after a few minutes
2. The mirror gets fogged up when you breathe on it
3. Liquid glass cools and hardens
Answers
Deposition is when a gaseous state changes to solid state by escaping liquid state. So I think it is 3. Liquid glass cools and hardens
a question about the size of the universe
Answers
Answer: The Universe has no scale, no matter and no size it is an infinite void of never-ending wonder.
Explanation:
The average kinetic energy of the molecules of an ideal gas at 10∘C has the value K10. At what temperature T1 (in degrees Celsius) will the average kinetic energy of the same gas be twice this value, 2K10? Express the temperature to the nearest integer. View Available Hint(s) T1 T 1 T_1 = nothing ∘C Part B The molecules in an ideal gas at 10∘C have a root-mean-square (rms) speed vrms. At what temperature T2 (in degrees Celsius) will the molecules have twice the rms speed, 2vrms? Express the temperature to the nearest integer. View Available Hint(s) T2 T 2 T_2 = nothing ∘C
Answers
Answer:
A) T1 = 566 k = 293°C
B) T2 = 1132 k = 859°C
Explanation:
A)
The average kinetic energy of the molecules of an ideal gas is givwn by the formula:
K.E = (3/2)KT
where,
K.E = Average Kinetic Energy
K = Boltzman Constant
T = Absolute Temperature
At 10°C:
K.E = K10
T = 10°C + 273 = 283 K
Therefore,
K10 = (3/2)(K)(283)
FOR TWICE VALUE OF K10:
T = T1
Therefore,
2 K10 = (3/2)(K)(T1)
using the value of K10:
2(3/2)(K)(283) = (3/2)(K)(T1)
T1 = 566 k = 293°C
B)
The average kinetic energy of the molecules of an ideal gas is given by the formula:
K.E = (3/2)KT
but K.E is also given by:
K.E = (1/2)(m)(vrms)²
Therefore,
(3/2)KT = (1/2)(m)(vrms)²
vrms = √(3KT/m)
where,
vrms = Root Mean Square Velocity of Molecule
K = Boltzman Constant
T = Absolute Temperature
m = mass
At
T = 10°C + 273 = 283 K
vrms = √[3K(283)/m]
FOR TWICE VALUE OF vrms:
T = T2
Therefore,
2 vrms = √(3KT2/m)
using the value of vrms:
2√[3K(283)/m] = √(3KT2/m)
2√283 = √T2
Squaring on both sides:
(4)(283) = T2
T2 = 1132 k = 859°C
A) The temperature at which the average kinetic energy will have a value of 2K10 is; T1 = 293 °C
B) The temperature at which the molecules have twice the rms speed, 2vrms is; T2 = 859 °C
A) We are given;
Initial temperature; T = 10°C = 283 K
Initial kinetic energy; KE = K10
Final kinetic energy; KE1 = 2K10
Now,formula for average kinetic energy of the molecules of an ideal gas is given as;
KE = (3/2)kT
Where;
k is Boltzmann constant
T is temperature
We are told that in the second case, KE = 2K10. Thus;
2K10 = (3/2)kT1
K10 = ¾kT1 - - - (eq 2)
In the first instance, we have;
K10 = (3/2)kT - - - (eq 1)
Put (3/2)kT for K10 in eq 2 to get;
(3/2)kT = ¾kT1
k will cancel out to get;
(3/2)T = ¾T1
Make T1 the subject to get;
T1 = 2T
Thus;
T1 = 2 × 283
T1 = 566 K
Converting to °C gives;
T1 = 293 °C
B) We want to find the temperature T2 (in degrees Celsius) at which the molecules will have twice the rms speed, 2v_rms.
Formula for kinetic energy is also;
KE = ½mv²
Thus;
½m(v_rms)² = (3/2)kT
v_rms = √(3kT/m) - - - (eq 1)
When rms speed is 2v_rms, we have;
½m(2v_rms)² = (3/2)kT2
v_rms = √(¾kT2/m) - - - (eq 2)
Thus;
√(3kT/m) = √(¾kT2/m)
Square both sides to get;
(3kT/m) = (¾kT2/m)
4T = T2
T2 = 283 × 4
T2 = 1132 K
Converting to °C gives;
T2 = 859 °C
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Which statements are true? [ Particles of different masses have the same average speed at & given temperature, II: The larger molecule, the slower it will effuse_ III. In real gases, the corrected volume is less than the ideal volume predicted by the ideal gas law. IV. For & given gas, the lower the temperature; the faster it will effuse. and IV III and IV 8 I, II and IV I[ and II L,I and III
Answers
The statements that are true are II: The larger the molecule, the slower it will effuse and III: In real gases, the corrected volume is less than the ideal volume predicted by the ideal gas law.
Which statements are correct regarding the relationship between particle masses and average speed, the effusion of larger molecules, and the volume of real gases?Statement I, "Particles of different masses have the same average speed at a given temperature," is false. According to the kinetic theory of gases, at a given temperature, particles of different masses will have different average speeds. Lighter particles tend to have higher average speeds compared to heavier particles.
Statement II, "The larger the molecule, the slower it will effuse," is true. Effusion refers to the escape of gas molecules through a small opening. Larger molecules have a lower average speed due to their greater mass, resulting in slower effusion rates compared to smaller molecules.
Statement III, "In real gases, the corrected volume is less than the ideal volume predicted by the ideal gas law," is true. Real gases deviate from ideal behavior at high pressures and low temperatures. This deviation is accounted for by corrections such as the van der Waals equation, which adjusts the predicted volume to account for intermolecular forces and molecular size.
Statement IV, "For a given gas, the lower the temperature, the faster it will effuse," is false. The rate of effusion is inversely proportional to the square root of the molar mass of the gas, but it is not directly dependent on temperature.
In summary, statements II and III are true, while statements I and IV are false.
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Which of the following statements is best supported by the data in the table?
Choose 1 answer:
Choose 1 answer:
(Choice A)
A
The genes for having large fruit became more common in the S. lycopersicum population over time due to selection of the large fruit trait by humans.
(Choice B)
B
During the process of tomato domestication, humans likely crossed plants with a higher-than-average number of fruits per inflorescence to create each new generation.
(Choice C)
C
Having many fruits per cluster is a disadvantageous trait for S. pimpinellifolium in the wild, likely because of the energy costs associated with fruit development.
(Choice D)
D
The genes for having large fruit became more common in the S. pimpinellifolium population over time, likely because the large fruit trait increased the probability of seed dispersal.
Answers
Answer: Choice A)
Explanation:
What can you infer about a wave with a short wavelength? Question 5 options: It has a low amplitude. It has a high amplitude. It has a high frequency. It has a low frequency.
Answers
Option C is correct. It has a high frequency. Wavelength is inversly proportional to the frequency. For short-wavelength, the frequency will be high.
Describe the connection between wavelength & frequency?Frequency and wavelength have an inverse connection with one another. As a result, the wave with a high frequency should have a short wavelength.
For short-wavelength, the frequency will be high.
Hence Option C is correct. It has a high frequency.
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Answer:
c <33
Explanation:
What ionic compound would bond in a 1 to 2 ratio?
Answers
An ionic compound that would bond in a 1:2 ratio would be one in which the cation has a charge of 2+ and the anion has a charge of 1-. This is because the total charge of the compound must be neutral.
An ionic compound is a type of chemical compound that is formed through the transfer of electrons between atoms. In an ionic compound, one or more positively charged ions (known as cations) are attracted to one or more negatively charged ions (known as anions) to form a stable structure. The cations and anions are held together by electrostatic forces known as ionic bonds.
Ionic compounds typically have high melting and boiling points, are usually crystalline solids at room temperature, and are often soluble in water. They can conduct electricity when dissolved in water or when melted, but not when in a solid state. Ionic compounds have a wide range of applications, including as building blocks for ceramics, in the production of batteries, and as components of various chemical processes. Examples of common ionic compounds include sodium chloride (table salt), calcium carbonate (chalk), and potassium iodide (used in medicine).
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A crate of mass 5 kg is pushed along a rough horizontal surface by a constant horizontal force of magnitude 40 N. The speed of the crate increases from 1 ms⁻¹ to 4 ms⁻¹ in a time of 2 seconds. a) Calculate the magnitude of the acceleration of the crate. b) The magnitude of the frictional force between the crate and the surface.
Answers
a) To calculate the magnitude of the acceleration of the crate, we can use the formula:
acceleration = (change in velocity) / time The change in velocity is given as 4 m/s - 1 m/s = 3 m/s, and the time is given as 2 seconds. Plugging these values into the formula, we have: acceleration = (3 m/s) / (2 s) = 1.5 m/s² So, the magnitude of the acceleration of the crate is 1.5 m/s². b) To find the magnitude of the frictional force between the crate and the surface, we can use Newton's second law: frictional force = mass * acceleration The mass of the crate is given as 5 kg, and the acceleration is 1.5 m/s² (from part a). Plugging these values into the formula, we have: frictional force = (5 kg) * (1.5 m/s²) = 7.5 N So, the magnitude of the frictional force between the crate and the surface is 7.5 N.
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5) A 4.0 kg box slides on a surface on a ramp that rises at do above the horizontal. The coefficient of kinetic friction
between the box and the surface of the ramp is 0.55. What are the magnitude and direction of the acceleration of
the box if it is sliding down the ramp?
Answers
The magnitude and direction of the acceleration of the box if it is sliding down the ramp is 5.39 m/s² downwards.
What is the magnitude of the acceleration?The magnitude and direction of the acceleration of the box if it is sliding down the ramp is calculated as follows;
F(net) = ma
F - μmg = ma
where;
F is the applied force on the boxμ is the coefficient of frictionm is mass of the boxa is the acceleration of the boxg is acceleration due to gravity0 - 0.55 (4)(9.8) = 4a
-21.56 = 4a
a = -21.56/4
a = -5.39 m/s²
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I NEED THE RIGHT ANSWER ASAP NO LINKS !!!
This is a Science question
Answers
Answer:
Control Variable
Explanation:
It must be constant throughout the experiment.
Feel free to mark this as brainliest! :D
What skills are used to move the body from one place to another? *
Answers
Answer:
Walking, Running , Hopping, Jumping, Leaping
Explanation:
Because they made you move from one place to another
A second-grade teacher dropped a box of paper clips and they scattered all over the floor. She then asked her students, "Why will a magnet be a useful tool to pick the paper clips?"
Answers
The magnet will be a useful tool to pick the paper clips because the magnet can attract the paper clips.
Attraction of magnetsThe like poles of magnets repel while unlike poles of magnets attracts. Magnets attracts irons or metallic materials.
The paper clips are mettalic or made of iron and hence the magnet will attract them.
There we can conclude that the magnet will be a useful tool to pick the paper clips because the magnet can attract the paper clips and will help to gather them together for easy picking.
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1. What is the speed of an object and the direction it is moving?
Answers
Answer:
Velocity
Explanation:
what creates a magnetic field? more than one answer may be correct. a difference in electric potential a charged capacitor disconnected from a battery and at rest a moving object with electric charge a stationary conductor carrying electric current a stationary object with electric charge
Answers
Electricity can be applied to a wire to produce a magnetic field.
Charged particles that are in motion produce all magnetic fields. Due to the continually moving electrons inside, even the magnet on your refrigerator is magnetic.Magnetic field can be defined as the area around a magnet in which the effect of magnetism is felt.
Magnetism is the strongest attractive force which occurs when any metallic substance lies around a magnet or magnet like substances.Magnetic compass needles and other permanent magnets line in the direction of magnetic fields similar to those found on Earth. Electrically charged particles are forced to move in a circular or helical path via magnetic fields. The operation of electric motors is generated by this force, which is applied to electric currents in wires in a magnetic field.To know more about magnetic field,
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please help me! Fill in all the blanks using the highlighted words. All 23 please. Thank you!!
Answers
Blood travels throughout the body as follows:
oxygen inhale red blood cellsblood vena cavaright atriumright ventriclelungs pulmonary deoxygenated lungs Gas exchangecapillaries oxygenated pulmonaryleft oxygenated heart left atrium ventricle aortaupper lowerHow does circulation work?Circulation is the continuous movement of blood throughout the body by the circulatory system. It consists of the heart, blood vessels (arteries, veins, and capillaries), and blood. The heart acts as a pump, sending oxygen-rich blood through the arteries to the body's cells, and then returning oxygen-depleted blood through the veins back to the heart.
The exchange of oxygen, nutrients, and waste products between the blood and cells occurs through the capillaries. This continuous flow of blood helps to maintain the body's functions and overall health.
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The wave take 0.12 to reach the satellite. Calculate the height of the orbit of the communications satellite
Answers
Answer:
x = 3.6 10⁷ m
Explanation:
The speed of an electromagnetic wave is constant, in a vacuum its value is c = 3 10⁸ m / s, this speed decreases when entering a material medium,
v = c / n
where n is the refractive index, but in this case the refractive index of air is n = 1.00002. The refractive index of a vacuum is n = 1, so we can assume that the change in velocity is negligible.
For the calculation we can use the relations of the uniform motion
v = x / t
x = v t
let's calculate
x = 3 10⁸ 0.12
x = 3.6 10⁷ m
i NEED THE RIGHT ANSWER FOR THIS ASAP NO LINKS !!!
Answers
Answer:
it is the dependent since it keeps changing over time get it :)
Explanation: