The work done on the box by the static friction force is zero.
What is work done ?Work is a measure of the energy transferred to or from an object by a force when the object is displaced. The amount of work done is defined as the product of the magnitude of the force and the distance over which the force is applied. It could be written as
Work (W) = Force (F) x Distance (d) x cos(theta)
where theta is the angle between the force and the displacement.
When a force is applied to an object, work is done if there is displacement in the direction of the force. If there is no displacement, no work is done. If the force is perpendicular to the displacement, no work is done, as the cosine of 90 degrees is zero.
Work is a scalar quantity and is measured in joules (J) in the SI system. One joule of work is done when a force of one newton (N) is applied over a distance of one meter (m) in the direction of the force.
Work can be either positive or negative, depending on the direction of the force and the displacement. When the force and displacement are in the same direction, the work is positive. When the force and displacement are in opposite directions, the work is negative.
The work done on the box by the static friction force is zero.
This is because the static friction force acts perpendicular to the displacement of the box. Therefore, the angle between the static friction force and the displacement of the box is 90 degrees. In this case, the work done by the static friction force is given by the dot product of the force and the displacement, which is equal to Fdcos(theta), where theta is the angle between the force and the displacement. Since cos(90) = 0, the work done by the static friction force is zero.
Note that although the static friction force does no work on the box, it does provide the necessary force to keep the box in place and prevent it from sliding around as the truck accelerates.
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If an objects acceleration is zero, then its speed must remain constant. True/False?
It is untrue to say that an object's speed must be constant if its acceleration is zero.
Is velocity constant? If acceleration is constant, then?A shift in velocity can occur in either its magnitude (speed), its direction, or both. Even if the speed may be constant in uniform circular motion, there is always an accompanying acceleration since the direction of the velocity is continually changing.
Is speed varying or constant?Explanation: In contrast to velocity, which has both magnitude and direction, speed is a vector and is therefore more than just a number. To keep the velocity constant, the speed must remain constant. A body can change directions while maintaining a constant speed (velocity).
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Suppose an asteroid orbiting the Sun had an orbital period of 7.5 years. What would its orbital radius be? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a. 3.8 AU b 20.5 AU с 422 AU d 56.3 AU e 2.7 AU
The orbital radius of the asteroid would be approximately 3.8 AU.
What is Kepler's third law?We can use Kepler's third law to calculate the orbital radius of the asteroid. Kepler's third law states that the square of the orbital period of a planet is proportional to the cube of its semi-major axis. Mathematically:
[tex]T^2[/tex] ∝ [tex]a^3[/tex]
where T is the orbital period and a is the semi-major axis.
Rearranging the equation, we get:
[tex]a = (T^2)^(1/3)[/tex]
Substituting T = 7.5 years, we get:
[tex]a = (7.5 years)^2/3 = 3.79 AU[/tex]
Therefore, the orbital radius of the asteroid would be approximately 3.8 AU.
Answer: a. 3.8 AU
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a student from sidney, australia compares the distance he obtained from the 1-st spark mark to the 25-th spark mark, with the similar result of a student who did the experiment in gaithersburg, maryland. both students operated identical setups powered with 60 hz ac, reported no missing spark marks, and achieved precision of their measurements in four significant figures. what difference in the results was found? data for the gravity acceleration on the two locations is provided in the text.
Answer
As the earth is an oblate spheroid, its radius near the equator is more than its radius near poles. Since for a source mass, the acceleration due to gravity is inversely proportional to the square of the radius of the earth, it varies with latitude due to the shape of the earth.
Explanation:
What causes long run equilibrium?
Long-run equilibrium is a dynamic process that is influenced by a variety of factors, including market forces, competition, technological progress, and government intervention.
In economics, there are several factors that can contribute to long-run equilibrium, including:
Market forces: In a free market economy, prices are determined by the forces of supply and demand. If the demand for a good or service increases, the price will rise, which will encourage suppliers to produce more, eventually resulting in long-run equilibrium.
Competition: In a competitive market, firms will strive to produce goods and services as efficiently as possible, which will drive down costs and result in lower prices. This will increase demand and eventually lead to long-run equilibrium
Technological progress: Technological progress can lead to increased productivity and efficiency, which can lower costs and increase the supply of goods and services. This can result in lower prices and increased demand, leading to long-run equilibrium.
Government intervention: Government policies such as price controls, subsidies, and taxes can affect the supply and demand for goods and services, and can either help or hinder the achievement of long-run equilibrium.
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How many hours in 480 minutes?
480 minutes is equal to 8 hours.
Any specific period of time that is used to measure or represent duration on a regular basis is referred to as a unit of time.
The second, which is specified as about 9 billion oscillations of the caesium atom, is the fundamental unit of time in the International System of Units and, by extension, throughout the majority of the Western world.
There are 60 minutes in one hour. To convert minutes to hours, we can use the following formula:
Time in hours = Time in minutes ÷ 60
So, to find the number of hours in 480 minutes, we can plug in the values into the formula:
Time in hours = 480 minutes ÷ 60
Time in hours = 8 hours
Therefore, there are 8 hours in 480 minutes.
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When a boxer moves into an oncoming punch, the force experienced is
A) no different, but the timing is different
B) decreased
C) increased
D) all of the above
When a boxer moves into an oncoming punch, the force experienced is (C) increased
The reason that moving into an oncoming punch increases the force experienced is due to the principles of momentum and force. When two objects collide, the total momentum of the system is conserved,
A boxer moving into an oncoming punch, the force experienced is increased. This is because the force of the punch is added to the force of the boxer's movement. When the boxer moves into the punch, the relative speed between the punch and the boxer is increased, which increases the momentum and thus the force of the impact.
In addition, moving into the punch can also reduce the distance over which the punch is applied, which further increases the force experienced.
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What is the value of 31c to fahrenheit
The value of 30° Celsius is equal to 86° Fahrenheit.
Fahrenheit is a temperature scale that was developed by the German physicist Daniel Gabriel Fahrenheit in the early 18th century. The Fahrenheit scale is based on dividing the range between the freezing point and boiling point of water into 180 equal parts, with 32 degrees Fahrenheit (°F) representing the freezing point of water and 212 °F representing the boiling point of water at standard atmospheric pressure.
Fahrenheit is still commonly used in the United States, particularly for weather forecasts and measurements of air temperature. However, most other countries and scientific fields use the Celsius (or Centigrade) scale, which is based on dividing the range between the freezing and boiling points of water into 100 equal parts, with 0 °C representing the freezing point and 100 °C representing the boiling point of water at standard atmospheric pressure.
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What is the light source for terrestrial telescope?
A terrestrial telescope is a refracting telescope used to view distant earthly objects. The light source is the light falling from a distant object.
A terrestrial telescope is used to view enlarged, erect images of distant objects on the earth surface. There are three lenses in a terrestrial telescope. Objective lens, eye lens and erecting lens.
The working principle is refraction. The three convex lenses converge the rays to produce an image. The light from a distant object fall on the telescope. The incident rays falling on the objective lens is refracted and the intermediate image is formed. This image falls on the erecting lens and another intermediate image is formed.
The image from the erecting lens will act as the object for the eye lens. As light passes through the eye lens, an enlarged erect image is formed.
So the light source is the light from the distant object.
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What is the mass of a
dog that weighs 382 N?
[?] kg
The mass of a dog that weighs 382N is 38.94kg
How to calculate mass?Weight of a substance refers to the force on an object due to the gravitational attraction between it and the Earth (or whatever astronomical object it is primarily influenced by).
The mass can be calculated from the weight using the following formula:
Weight = mass × acceleration due to gravity.
Acceleration due to gravity on Earth is 9.81 m/s²
382N = m × 9.81m/s²
m = 38.94kg
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what would happen if the earth stopped spinning for 1 second
Answer:
It would be as if everything on the surface were suddenly given a speed of over 1000 mph.
V = S / t
V = 25000 mi (1 rotation of earth) / 24 hours in one day)
V > 1000 mph speed of objects on surface due to rotation
7N
2 kg
17 N
Net Force:
Balanced or Unbalanced
Direction of Motion:
The net force is obtain as the effective force.
What is the net force?The question is unclear but I will try to explain the concept of the net force.
The net force is the sum of all the forces acting on an object. In other words, it is the overall force that is causing an object to accelerate or change its motion. If the forces acting on an object are balanced, then the net force is zero and the object will remain at rest or continue moving with a constant velocity.
If the forces are in the same direction, then the net force will be equal to their sum. If the forces are in opposite directions, then the net force will be the difference between them.
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why are near- infrared telescopes located on mountaintops and ultraviolet telescopes in earth orbit?A. the primary infrared blocker, water vapor, is mostly in the lower atmosphere and the primary ultraviolet blocker, ozone, is located high in the atmosphere, far above mountaintops.B.there would be some chromatic aberrationC. light gathering power and resolving power.D. the primary lenses of refracting telescopes.
To minimise atmospheric interference brought on by water vapour and ozone, respectively, near-infrared telescopes are situated on mountaintops and ultraviolet telescopes in Earth's orbit.
Because of option A, near-infrared telescopes are situated on mountaintops and ultraviolet telescopes are positioned in Earth's orbit. The majority of incoming radiation at both ends of the spectrum is absorbed by the atmosphere of the Earth, with water vapour and ozone serving as the main absorbing materials for near-infrared and ultraviolet wavelengths, respectively. Astronomers can get clearer observations of infrared sources by mounting near-infrared telescopes atop mountaintops, which reduces the amount of atmospheric interference. The opposite is also true; by positioning ultraviolet telescopes in Earth's orbit, it is possible to detect sources that would otherwise be hidden by the atmosphere while avoiding the majority of atmospheric interference. This is also the rationale for why further telescopes that focus on other wavelengths of the electromagnetic spectrum, such as X-rays and gamma rays.
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which subatomic particle is responsible for creating electrial charge?
Electrons are responsible for creating electrical charge.
Describe electrical charge.
When two materials rub against one another or come into touch, an electrical charge is produced. Electrons can actually rub off of one thing and onto another when the materials are in touch. This does not imply that any two materials will move electrons when rubbed together.
There are instances when the protons and electrons in an atom's outermost shells are not strongly attracted to one another. It is possible to force these electrons out of their orbits. They can move from one atom to another by exerting force. Electricity is made up of these moving electrons.
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NASA is conducting a test with the Perseverance Rover to investigate the gravity on Mars. They test a pendulum with a length of L on the Earth and find it has a period of 1.0 s. The Perseverance Rover has a similar pendulum with a length of L/2. If the acceleration due to gravity on Mars is 1/3 the acceleration due to gravity on the Earth, what is the period of the Perseverance Rover's pendulum on Mars?
If the time period of the pendulum in earth is 1 seconds, then the length L is 0.24 m. If length in mars is L/2 and acceleration due to gravity is 1/3rd of that of earth, the time period of the pendulum on mars is 1.216 seconds.
What is time period of oscillation ?The time period of oscillation of a pendulum is the time taken to complete oscillation. It is related to the length l, and acceleration due to gravity g as:
T = 2π √l/g
T for earth = 1 s
g for earth = 9.8 m/s²
then l = T/4π² × g
l = 1/4π²× 9.8 m/s²
= 0.24 m
If in mars L = L/2 = 0.24 /2 = 0.12 m
g = 9.8 m/s²/3 = 3.22m/s²
Then time period T = 2π × √0.12 m/3.22m/s²
T = 1.216 s.
Therefore, the time period of the Rover's pendulum in mars is 1.216 seconds.
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How long does it take for an electromagnetic wave pulse to reach the Moon from the Earth?
Pls with calculations!
The population of country x is 250,000, and the labor force is 200,000 persons. If 175,000 people are employed, what is the unemployment rate?.
To find the unemployment rate, we first need to determine the number of unemployed individuals in Country X. We can do this by subtracting the number of employed individuals from the labor force:
How to find unemployment rate ?Employment = Workforce - Working200,000 - 175,000 people are unemployed.
25,000 unemployed people
Thus, Country X has 25,000 unemployed people. By dividing the number of jobless people by the labour force and multiplying the result by 100, we may get the unemployment rate:(Unemployed / Labor force) x 100 equals the unemployment rate.(25,000 / 200,000) times 100 equals the unemployment rate.
12.5% is the unemployment rate.
Therefore, Country X has a 12.5% unemployment rate.
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rods play a key role in dark adaptation and detects gray, black, and white. true or false?
Rods play key role in dark adaptation and detect gray, black and white. : true.
What is the role of Rods?Rods are photoreceptor cells in the retina of eye that are specialized for low-light vision and they contain a photopigment called rhodopsin, which is sensitive to light and helps in seeing in dimly lit environments.
In dark conditions, rods become highly sensitive, allowing to see even in very low light levels and this is known as dark adaptation. It takes about 30 minutes for the rods to fully adapt to the dark. As the light levels increase, sensitivity of the rods decreases and cones takes over as the primary source of visual input.
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Which color of the light has the longest wavelength?
A. Red
B. Blue
C. Green
D. Violet
Red color of the light has the longest wavelength. The correct answer is A.
Red light has the longest wavelength of all the colors in the visible light spectra.
Wavelengths of red light range from 620-750 nm (nanometers), while the other colors have shorter wavelengths. Blue light has a wavelength of 450-495 nm, green light has a wavelength of 495-570 nm, and violet light has a wavelength of 380-450 nm.
The longer the wavelength, the lower the energy of the light. This is why red light is often associated with warmth and heat, as it has lower energy than other colors of light. Conversely, blue and violet light have the shortest wavelengths and therefore have the highest energy.
Red light has the longest wavelength of all the colors in the visible spectra.
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on what planet were rock formations that looked like bears recently discovered?
On Mars planet were rock formations that looked like bears recently discovered. NASA astronomers have found a bizarre rock formation on the surface of the red planet, resembling a bear's face.
NASA (National Aeronautics and Space Administration) is a United States government agency that is responsible for the country's civilian space program and for research in space exploration, aeronautics, and science. NASA was established in 1958 in response to the Soviet Union's launch of the first artificial satellite, Sputnik. The agency's mission is to explore space, conduct research, and develop new technologies that benefit society.
NASA has achieved many significant accomplishments in space exploration, including sending the first humans to the moon and launching numerous spacecraft to explore the planets and other celestial bodies in our solar system. The agency also operates the International Space Station, a collaborative effort with other countries to conduct research and study the effects of long-term space travel on the human body.
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Based on astronomy from space-based telescopes, select all of the correct statements from the following list.
(a) Most types of electromagnetic waves are not visible to ground-based telescopes.
(b) There would be no limit to what an optical telescope in space could see.
(c) Enough infrared energy gets to Earth's surface that infrared telescopes do not need to be put in orbit.
(d) The Chandra and Spitzer telescopes are all in space.
(e) The Hubble Space Telescope makes observations at all wavelengths.
(f) Cosmic rays are the absolute highest-energy type of electromagnetic wave.
(g) Earth's atmosphere has no effect on visible light, so there is no need to place an optical telescope in space.\
From the following list, option a, d and e are correct options based on astronomy from space-based telescopes.
Describe astronomy.The study of astronomy includes all of the universe besides our planet's atmosphere. That includes celestial bodies like the Sun, Moon, planets, and stars that we can see with our unaided eyes. It also contains objects that humans can only see via telescopes or other technologies, like as distant galaxies and tiny particles.
Who made astronomy possible?Galileo's studies of the Moon, Venus's phases, the moons orbiting Jupiter, sunspots, as well as the discovery that the Milky Way Galaxy is made up of what appears to be an infinite number of individual stars helped give rise to modern astronomy.
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Fill The Blank? During the Full Moon and New Moon days, the Sun, the Moon and the Earth are in the same line and the tides are at their highest level. These tides are called ______
Answer:
Spring Tides
Explanation:
The capacitance of a capacitor does not depend onA.the separation between the platesB.the size of the platesC.the charges on the platesD.none of the above
The capacitance of a capacitor depends on the area of the plates, the distance between the plates, and the permittivity of the dielectric material and the correct option is (D)
The capacitance of a capacitor depends on the area of the plates, the distance between the plates, and the permittivity of the dielectric material between them.
It is clear that capacitance is directly proportional to the area of the plates and the permittivity of the dielectric material, and inversely proportional to the distance between the plates.
Now, let's come back to the question, which asks about the factor that does not affect the capacitance of a capacitor. The options given are the separation between the plates, the size of the plates, the charges on the plates, and none of the above.
The correct answer is option D, i.e., none of the above.
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How many shells does phosphorus have according to the Bohr model?
Phosphorus has three shells according to the Bohr model.
The Bohr model is a simplified atomic model that represents electrons orbiting the nucleus in discrete energy levels or shells. The first shell can hold up to two electrons, the second shell can hold up to eight electrons, and the third shell can hold up to 18 electrons.
Phosphorus has 15 electrons, so according to the Bohr model, the first shell has two electrons, the second shell has eight electrons, and the third shell has five electrons. .
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In which direction will a negatively charged particle experience a force in an electric field?
A.
in the same direction as the electric field
B.
in the opposite direction as the electric field
C.
at right angles to the electric field
D.
always downward
Answer:
D always downward because it is negative
When ABS activates do you need to pump the brakes?
No, when ABS (Anti-lock Braking System) activates, you do not need to pump the brakes.
ABS is a safety feature in modern cars that prevents the wheels from locking up during hard braking or in slippery conditions, which could cause the car to skid and lose control. When the ABS system detects that a wheel is about to lock up, it rapidly pulses the brakes on that wheel to prevent it from stopping rotating. This helps to maintain traction between the tires and the road, allowing the driver to maintain steering control and come to a stop safely. When ABS activates, you should keep your foot firmly on the brake pedal and let the system do its job. The pulsing or vibrations that you may feel in the brake pedal are normal and indicate that the ABS system is working properly. You should continue to steer the car in the desired direction and avoid any sudden movements, while the ABS system helps to slow down the car safely.
Pumping the brakes can actually interfere with the ABS system and reduce its effectiveness. So, it's important to trust the ABS system and let it do its job to ensure maximum safety during emergency braking situations.
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a parallel-plate capacitor of capacitance c has plate area a and distance between plates d. the capacitor is connected to a battery with voltage v, fully charged and then disconnected. a slab of dielectric material with dielectric constant 4.0 is then inserted into capacitor, completely filling region between plates.
25% Part (a) After inserting the dielectric, the capacitance is now: 25% Part (b) After inserting the dielectric, the voltage across the capacitor is now: A 25% Part (c) After inserting the dielectric, the charged stored in the capacitor is now: 25% Part (d) After inserting the dielectric, the electric field in the capacitor is now:
The new electric field in the capacitor is E = V/d = (Q/A)d/εoεr/d = (Q/Aεoεr).
An electric field is a physical preach and it by the electric charges that extra a force and other charges extracting or appealing them electric conducted by electric charges with a statinary or moving the electric field is a vector field meaning that it is both electric and direction strength of electric field is measured in moles per meter electric field and used in a variety of application from our generation to medical treatment.
Part (a) After inserting the dielectric, the capacitance is now:
The capacitance of a parallel-plate capacitor can be calculated using the equation C = εoεrA/d, where εo is the permittivity of free space, εr is the relative permittivity of the medium between the plates, A is the area of the plates, and d is the distance between the plates. Since the dielectric medium has a relative permittivity of 4.0, the new capacitance of the capacitor is C = εoεrA/d = εo(4.0)(a)/d.
Part (b) After inserting the dielectric, the voltage across the capacitor is now:
The voltage across a capacitor is related to the amount of charge stored on it, which is proportional to the capacitance. Since the capacitance has increased, the voltage across the capacitor has also increased. The new voltage across the capacitor is V = Q/C = Q/(εoεrA/d) = (Q/A)d/εoεr, where Q is the charge stored in the capacitor.
Part (c) After inserting the dielectric, the charge stored in the capacitor is now:
The charge stored in a capacitor is related to the capacitance, so the charge stored in the capacitor has increased due to the increase in capacitance. The new charge stored in the capacitor is Q = Cv = (εoεrA/d)v = (A/d)vεoεr, where v is the voltage across the capacitor.
Part (d) After inserting the dielectric, the electric field in the capacitor is now:
The electric field in a capacitor is related to the voltage across the capacitor and the distance between the plates. Since the voltage across the capacitor has increased and the distance between the plates has not changed, the electric field has increased. The new electric field in the capacitor is E = V/d = (Q/A)d/εoεr/d = (Q/Aεoεr).
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Bodily injury due to slips and falls is considered a physical hazard from conditions involving:
Bodily injury due to slips and falls is considered a physical hazard from conditions involving: surface residues.
Causes of InjuryIn general, injuries can be caused by:
Accidents and trauma, such as falls or hard knocks. Not warming up properly before exercising. Using inappropriate equipment or improper technique while exercising. Too push yourself (excessive exercise). Almost any part of the body can be injured, including muscles, bones, joints, and connective tissue (tendons and ligaments). The ankles and knees are particularly susceptible to injury.Learn more about bodily injury at
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1. Magnetic fields created by currents and magnets ___________ forces due to other magnetic fields.
A.
cannot be affected by
B.
cannot affect
C.
can affect
D.
always cancel out
2. In which direction will a negatively charged particle experience a force in an electric field?
A.
in the same direction as the electric field
B.
in the opposite direction as the electric field
C.
at right angles to the electric field
D.
always downward
3. A moving charge in a magnetic field experiences a force that acts perpendicularly to both ________.
A.
the charge's strength and its velocity
B.
the charge's velocity and the electric field
C.
the charge's velocity and the magnetic field
D.
the magnetic field and the charge's acceleration
4. Electric fields are MOST associated with ________.
A.
neutrons
B.
moving particles
C.
charged particles
D.
permanent magnets
Answer:
1. C. can be affected
2. B. in the opposite direction as the electric field
3. C. the charge's velocity and the magnetic field
4. I am sorry I have no answer for this one :(
Explanation:
1. Yes they actually can be affected because they are interacting with another magnectic field
2. The force exerted on a negatively charged particle by the electric field is always in " the direction opposite that of the electric field itself. "
3. In the context of the electric field as the set of almost all electric field vectors in a region of space, the most simplest kind of an electric field is a uniform electric field
how would the amount of incoming solar radiation change at the equator if earth’s axis were vertical instead of tilted?
If the Earth's axis were vertical instead of tilted, there would be no seasonal variation in the amount of incoming solar radiation at the equator.
Currently, the Earth's axis is tilted at an angle of approximately 23.5 degrees relative to its orbit around the sun. This causes the amount of incoming solar radiation at the equator to vary over the course of the year, with the highest amounts of incoming radiation occurring during the solstices and the lowest amounts occurring during the equinoxes.
If the axis were vertical, the amount of incoming solar radiation would be more consistent throughout the year, but the poles would receive less solar radiation overall.
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A pipet is used to measure out 10 mL of water. If the mass of this volume of water is 9.990 g and the density of water is given as 0.9978 g/mL, what is the actual volume of water measured out? a.10.000 mL b. 9.990 mL c. The actual volume measured out is impossible to tell d. 10.012 mL
The correct working of this question with the given information is as follows:
mass of water taken = 9.990 gram ,
density of water taken = 0.9978 gram/ml
The formula to find out the volume of the water measured out is as follows:
volume in ml = mass in gram/density in gram per ml
We can now substitute values in this given formula to find volume of water taken in ml, which is
volume of water taken in ml = 9.990/0.9978 = 10.012 ml
Therefore the correct option to this question is option d. The actual volume of water measured is 10.012 ml
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