A block of wood is floating with one half of its volume out of the water. Then it is pushed down so that it is completely underneath the water. Use your understanding of buoyant force and Archimedes' principle to determine what happens to the forces on the block of wood.
A. The buoyant force on the block is the same in the two cases because the weight per unit volume of the wood has not changed.
B. The buoyant force on the block is the same in the two cases because the weight per unit volume of the water is the same in each case.
C. The buoyant force on the block is greater when the block is completely submerged than it is when the block is floating.
D. The buoyant force on the block is greater when it is floating than when it is totally submerged.
E. The buoyant force on the block is the same in the two cases because the block loses weight as it is submerged.

Answer:

Below

Explanation:

Specific heat has units of    J / (kg C)  

  ( a degree of C is the same as one K)

Sub in the values

   678 J / (3.78 kg * 4.25 C) = spec heat = 42.2   J/(kg-K)

The light gathering power of telescope b is 25 times that of telescope a

The light gathering power of a telescope is determined by its collecting area, which is proportional to the square of the diameter of the primary mirror.

Assuming both telescopes have the same quality of optics and are used under similar conditions, the ratio of their light gathering powers is,

(telescope b collecting area) / (telescope a collecting area)

= (telescope b diameter)^2 / (telescope a diameter)^2

= (100 cm)^2 / (20 cm)^2

= 25^2 / 5^2

= 25

Therefore, the light gathering power of telescope b is 25 times that of telescope a.

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False. Under electrostatic conditions, there is no electric field inside a solid conductor only if the conductor is in a state of electrostatic equilibrium. In other words, if the conductor is charged, there will be an electric field inside the conductor, but it will decrease rapidly as you move away from the surface of the conductor.

The electric field is a field that represents the force that would be exerted on a charged particle at a particular point in space. It is a measure of the intensity of the electric force that a charged object would experience if placed at that point in space.

The electric field can be represented mathematically as a vector field and is typically denoted by the symbol "E". It is a measure of the force per unit charge & has units of volts per meter (V/m). The direction of the electric field at a particular point is the direction of the force that would be exerted on a positive test charge placed at that point.

Electric fields are a fundamental concept in electricity and electromagnetism and play an important role in a wide range of applications, including electric motors, generators, and electronic devices. They are used to describe the behaviour of charged particles and the interactions between charged particles, and are an essential tool for understanding and describing the behaviour of electric and magnetic fields.

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Distance between the two fluid levels in the manometer is 0.00916 meters or 9.16 millimeters.

A manometer is a device used to measure pressure by comparing it to the pressure of a fluid in a column. In this case, the manometer is filled with water, and is connected to the compressed air tank alongside a pressure gauge. The pressure gauge indicates that the pressure inside the tank is 11 kPa, but the manometer measures the difference between the pressure inside the tank and the atmospheric pressure. To calculate the distance h between the two fluid levels in the manometer, we need to use the following formula:

ΔP = ρgh

where ΔP is the pressure difference, ρ is the density of the fluid, g is the acceleration due to gravity, and h is the height difference between the two fluid levels.

First, we need to calculate the pressure difference between the air inside the tank and the atmospheric pressure:

ΔP = [tex]P_t - P_a[/tex] = 11 kPa - 101 kPa = -90 kPa

The negative sign indicates that the pressure inside the tank is lower than the atmospheric pressure. Next, we can plug in the values of ρ and g, which are [tex]1000 kg/m^3[/tex] and [tex]9.81 m/s^2[/tex], respectively:

[tex]-90 kPa = 1000 kg/m^3 * 9.81 m/s^2 * h[/tex]

Solving for h, we get:

h = [tex]-90 kPa / (1000 kg/m^3 * 9.81 m/s^2)[/tex] = -0.00916 m

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Rock that has partially weathered can be found in a soil profile's C horizon.

horizon: an unique layer of soil that is roughly parallel to the land surface and whose characteristics are the result of the interactions between living things and percolating water. The topsoil, for instance, is referred to as the A horizon, while the subsoil B horizons are the name given to horizons.

"Eye level" and "horizon line" are frequently used interchangeably. The term "horizon line" or "eye level" refers to a physical/visual line dividing sky from land or sea. Whether viewing an object, an interior scene, or an external scene, it refers to the real height of the viewer's eyes.

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According to the question: the units of t in the equation d = rt are seconds.

An equation is a mathematical statement that expresses the equality of two expressions or the relationship between different quantities. It usually consists of an equal sign and two expressions that are separated by the sign. Equations are used in a variety of different disciplines, including mathematics, engineering, and physics. They are used to solve problems and to analyze relationships between different variables.

This is because feet per second (r) is a unit of speed,
which is the rate at which distance is covered (d).
Since speed is the rate of change of distance over time, the units of time (t) must be seconds in order to cancel out the units of speed (feet per second). Therefore, the units of t in the equation d = rt are seconds.

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The force of gravitational attraction increases by 9 as the two point masses increase by 3.

Gravitational force of attraction, F is the force that pulls two point masses, m and M which are separated by a distance, d.

Mathematically,

Fg = GMm/r^2

Initially,

M1 = M1

M2 = M2

The remaining parameters are unchanged.

Fg1 = G * M1 * m1/(d/2)^2

Then,

M1 = 3M1

M2 = 3M2

Fg2 = G * 3M1 * 3M2/(d/2)^2

Making the constants G/(d/2)^2 the subject of formula and then comparing both equations,

= Fg1 = (M1 * M2); Fg2 = (9 * M1 * M2)

= Fg2 = 9 * Fg1

The force of gravitational attraction increases by 9 as the two point masses increase by 3.

What is gravitational force?

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The unit of electrical capacitance is the farad (abbreviated F), named after the English physicist and chemist Michael Faraday.

Electrical capacitance is a property of a circuit that describes its ability to store electrical charge. It is defined as the ratio of the magnitude of electric charge stored on a conductor to the potential difference (voltage) across the conductor. Capacitance is measured in farads (F), which is a very large unit, so capacitors are typically rated in smaller units such as microfarads (µF) or picofarads (pF).

Capacitors are electronic components that are designed to provide capacitance and are commonly used in electronic circuits for a variety of applications, such as filtering, timing, and energy storage. Capacitance is determined by the geometry of the conductors, the distance between them, and the dielectric constant of the material between them. A capacitor consists of two conductors separated by a dielectric material, which can be air, paper, ceramic, or some other non-conductive material.

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The spot where 0° longitude meets 0° latitude is located in the Atlantic Ocean. This point is known as the Prime Meridian.

The Prime Meridian is an imaginary line that runs from the North Pole to the South Pole and is defined as 0° longitude. It is used as a reference line from which longitudes are measured, with longitudes to the east being positive and longitudes to the west being negative. The Prime Meridian is important because it helps to establish a global coordinate system that can be used to accurately describe the location of places on the Earth's surface. The Prime Meridian was first established by the British in 1851 and is now recognized as the standard by which the world measures longitude. It is also known as the Greenwich Meridian because it passes through the Royal Observatory in Greenwich, London, England. The Prime Meridian and the International Date Line (located at 180° longitude) divide the Earth into the Eastern Hemisphere and the Western Hemisphere.

The Prime Meridian is now widely recognized as the standard for measuring longitude, and is used by geographers, navigators, and cartographers around the world. It is also the reference point for the Greenwich Mean Time (GMT), which is the time standard used by many countries around the world, including the United Kingdom.

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One teaspoon is equal to approximately 5 milligrams (mg).

Milligrams (mg) is a unit of measurement commonly used to quantify the quantity of a substance found in a given sample or dose. One milligram is identical to one-thousandth of a gram, and it's far regularly used in medicine to measure the efficiency of a drug or complement.

While a medicine is prescribed, it is generally measured in milligrams, with the dosage being decided by way of the patient's age, weight, and scientific circumstance. as an instance, a patient might be prescribed 500 mg of ibuprofen to control pain and infection. further to its use in medicinal drug, milligrams also are used in medical research, food and nutrients labeling, and industrial production. know-how the connection between milligrams and other gadgets of size, inclusive of grams and micrograms, is important for correctly measuring and administering substances.

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Complete Question: -

How many mg in one teaspoon ?

Answer: The answer provided describes the difference between wind speed and wind velocity, and explains why a statement made by a meteorologist that only mentions wind speed is inaccurate.

Explanation:

The statement made by the meteorologist is false because wind speed and wind velocity are not the same things. Wind speed refers to how fast the wind is moving, while wind velocity refers to both the speed and direction of the wind.

To accurately describe the wind's velocity, the meteorologist would need to include both the speed and direction of the wind.

For example, if the wind is moving at 30 miles per hour from the southeast, the meteorologist could say "High wind advisory! The wind is expected to reach a velocity of 30 miles per hour from the southeast.

In the original statement, the meteorologist only described the wind's speed, not its velocity. By only mentioning the wind speed, it is unclear whether the wind is moving in a specific direction and the statement becomes inaccurate.

Answer:

Locks

Explanation:

Locks were used to raise and lower boats. They pump water in and/or out of "locked" chambers to get boats to the same level as the water.

12V is the potential (relative to infinity) at the center when each of the other corners is also contains a point charge of +q

What constitutes a potential difference?

Potential difference that might exist between any two points is the amount of work required to move a unit positive charge along any path from one point to another without accelerating in an electric field.

V = kq /r

Due to the fact that each charge in the square has the same charge and is located at an equal distance from the point, they will all result in the same potential (the distance from a corner to the center of a square is the same for every corner). Therefore, all four charges must create a potential of 3.0 V if only one charge does. In other words, the supplied potential must be multiplied by four to represent the total potential.

Required potential will be 4*3 i.e. 12V

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A faint splash of colour and hydration and nourishment are both provided by the "Good Vibrations" Kab Cosmetics Mini Tinted Lip Oil.

Product Kab Cosmetics Mini Tinted Lip Oil in "Good Vibrations" is a lip product that provides a sheer wash of color while also hydrating and nourishing the lips. The lip oil is formulated with a blend of natural oils, including jojoba oil, coconut oil, and vitamin E, which work together to moisturize and protect the delicate skin of the lips.

The product comes in a mini size that is convenient for on-the-go touch-ups, and the shade "Good Vibrations" is a coral-pink hue that adds a natural-looking pop of color to the lips.

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Micro is 1 in 1000000 where as nano indicates the amount as 1 in 10⁹. Thus, the micro is 10³ times or 1000 times greater than the amount in nano.

There are different kinds of units for the same physical quantity which are used in different national and international systems or using based on the size etc. These units can be interchanged based on certain relationship between them.

Micro , nano, milli , kilo etc are various prefix used to indicate the size of a measurement. For example if they are used in mass, they are called as micrograms, nanograms etc. If in volume they are microliters, nanoliters etc.

Now, micro indicates 10⁻⁶ and one nano unit  is 10⁻⁹.

lets take mass.

1 g = 10⁶ micrograms

1 g = 10⁹ nanograms.

then 1 nanogram =  10⁻⁹ grams

1 microgram = 10⁻⁶ grams

Then one microgram is  10⁻⁶ /  10⁻⁹ = 10³ or 1000 times greater than one nanogram.

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Length of the pendulum, l=1.5m

Mass of the bob  =m

Energy dissipated =5%

According to the law of conservation of energy, the total energy of the system remains constant.

At the horizontal position A:

Potential energy of the bob, EP =mgl

Kinetic energy of the bob, EK =0

Total energy =mgl ------   (i)

At the lowermost point (mean position) B:

Potential energy of the bob, EP =0

Kinetic energy of the bob, EK = ½ mv²

Total energy Ex = ½ mv²        ....(ii)

As the bob moves from the horizontal position to the lowermost point, 5% of its energy gets dissipated.

The total energy at the lowermost point is equal to 95% of the total energy at the horizontal point, i.e.,

½ mv² = 95/100​ mgl

v=( 2×95×1.5×9.8/100 )^(½)

v=5.28m/s

What is a pendulum?

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No, everyone does not see the same side of the Moon. The Moon is tidally locked with the Earth, which means that it rotates on its axis at the same rate that it orbits around the Earth.

The Moon is Earth's only natural satellite, a celestial body that orbits our planet. It is the fifth-largest moon in the solar system, with a diameter of 3,474 km, about a quarter the size of Earth. The Moon's surface is covered in craters, mountains, and flat plains called maria. The Moon's gravity is about one-sixth of Earth's gravity, which allows astronauts to jump much higher and walk much more easily on its surface.

The Moon is thought to have formed around 4.5 billion years ago, shortly after the formation of the solar system. It is believed to have been created when a Mars-sized body collided with the early Earth, and the debris from the collision eventually coalesced to form the Moon. The Moon's phases are caused by its orbit around Earth, which takes about 27.3 days to complete.

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The gravitational force between the two spheres of mass 1 kg will be 1.6675 × 10⁻¹¹ Newtons.

The gravitational force could be described as a force of attraction or the attractive force which attracts all the physical forms which are having some mass. Gravitational force is by far the weakest recognized natural force on this planet.

F = Gm₁m₂/ r²

F = Gravitational force,

G = Gravitational constant,

m₁ and m₂ are the masses of the two objects,

r is the distance between the two objects.

F = Gm₁m₂/ r²

F = 6.67 × 10⁻¹¹ × 1 × 1/ (2)²

F = 6.67 × 10⁻¹¹/ 4

F = 1.6675 × 10⁻¹¹ N

Therefore, the gravitational force will be 1.6675 × 10⁻¹¹ Newtons.

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The characteristics that apply to atomic orbitals is, defined by the square of the wave function (ψ2), defined by the wave function (ψ), a region around the nucleus of an atom where the probability of finding an electron is high. Correct options are B, D, F.

An atomic orbital is a region around the nucleus of an atom where the probability of finding an electron is high. It is defined by the wave function (ψ) and the square of the wave function (ψ2). An orbital is identified by a unique combination of three quantum numbers, and in the case of many-electron atoms, four quantum numbers.

An orbital is not a shell in an atom containing the valence electrons, which is a different concept. Therefore, the characteristics that apply to an atomic orbital are: B, D, and F.

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60 arcseconds makes 1 arcminute and 60 arcminutes makes 1 degree. This can be converted by multiplying the decimal points by 60.

So 24.2 degrees = 24 degrees and 12 arcminutes

     1.56 degrees = 1 degree 33 arcminutes and 12 arcseconds

     0.1 degrees is 6 arcminutes

      0.01 degrees = 36 arcseconds

      0.001 degrees = 3.6 arcseconds

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The magnitude of the electric field E created by a charged sphere at a distance r from its center is given by:

E = kQ/r^2

For sphere A, since it is a good conductor, the charge is distributed uniformly on its surface. So the total charge Q is given by:

Q = 2μC

The electric field E created by sphere A at a distance of 4 cm from its center is:

EA = kQ/r^2 = k(2μC)/(0.04m)^2

For sphere B, since its charge is distributed uniformly throughout its volume, the total charge Q is given by:

Q = (4/3)πr^3ρ

Q = (4/3)πr^3ρ = (4/3)π(0.05m)^3(2μC/((4/3)π(0.05m)^3)) = 2μC

EB = kQ/r^2 = k(2μC)/(0.04m)^2

Therefore, we can see that EA = EB, which means that option 3 is correct: EA = EB > 0.

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The force applied on the object will be 5 newton in the downward direction due to the gravitational force acting on it.

if 5N force is applied in the upward direction then the force is said to be applied in +ve y axis where as the force of 10N due to gravitation applied downwards is said to be applied in the -ve y axis.

Both the forces hence will cancel out each other.

The total force applied on the objet can be represented as:

+5N + (-10N) = -5N

hence the force applied on the object is 5N in the downward direction.

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The density of water at standard temperature and pressure (STP), which is defined as 0 °C (273.15 K) and 1 atm (101.325 kPa), is approximately 1000 kilograms per cubic meter (kg/m³).

This value is commonly used as a reference value for the density of liquids and is often abbreviated as 1 g/cm³ or 1 g/mL.

Temperature is a measure of the degree of hotness or coldness of an object, substance, or environment. It is a physical quantity that quantifies the average kinetic energy of the molecules in a substance or object. The unit of measurement for temperature is degrees Celsius (°C) or Fahrenheit (°F), and the international standard unit is Kelvin (K).

Temperature is an essential factor in determining the physical, chemical, and biological properties of a substance or object. It affects the rate of chemical reactions, the conductivity of materials, and the behavior of living organisms. Temperature can be measured using thermometers, which are devices that detect changes in the thermal energy of a substance or object.

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The spectral series of hydrogen atoms, lying in a visible range of electromagnetic waves is Balmer series. The correct answer is (D).

A series of wavelengths organised sequentially that describe light or other electromagnetic radiation emitted by energised atoms is known as a spectral series.

The Balmer series of hydrogen atoms is the spectral series that lies in the visible range of electromagnetic waves. This series corresponds to the electron transitions from higher energy levels (n>2) to the second energy level (n=2).

The visible range of electromagnetic waves includes wavelengths between 400 and 700 nm, and the Balmer series includes wavelengths within this range.

The other spectral series of hydrogen atoms, including the Paschen series (infrared), Pfund series (infrared), and Lyman series (ultraviolet), lie outside of the visible range of electromagnetic waves.

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At the temperature -40°C (-40°F), can you throw water in the air and it freezes.

This is known as the "flash freezing" point. It is the temperature at which water droplets instantly freeze when they come into contact with cold air.

This will occur in some actual temperature also. That will depend on various factors such as the size of the water droplets, the humidity of the air, and the speed of the wind.

The air around the freezing water droplets does not necessarily have to be in the temperature -40°C. For water to freeze in the air, the air temperature must be below this given temperature in at least some of the places. In many places the this is true also.

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Answer:

Explanation:

The force on an electron moving through an electric field is given by:

F = qE

where q is the charge of the electron, and E is the electric field.

The force on an electron moving through a magnetic field is given by:

F = qvB

where v is the speed of the electron, and B is the magnetic field.

Since the electron is experiencing no net force, the electric force must be balanced by the magnetic force. Thus:

qE = qvB

Solving for v, we get:

v = E/B

Substituting the given values, we get:

v = 400 N/C / 0.15 T

v = 2666.67 m/s

Therefore, the speed of the electron is 2666.67 m/s.

Answer:

Below

Explanation:

Your mass is irrelevant....here is why:

All of your POTENTIAL energy (mgh)

           will be converted to KINETIC energy  ( 1/2 m v^2)

so

mgh = 1/2 m v^2     divide both sides by 'm' <====then 'm' is gone !

gh = 1/2 v^2            now multiply by 2

2 gh  = v^2              sqrt both sides

v = sqrt (2gh)     = sqrt  [ 2 ( 9.81)(3.4)]   = 8.2 m/s

Temperature. The average kinetic energy of the molecules of an object is related to its temperature.

Kinetic energy is the energy of an object in motion. It is the energy associated with the movement of an object or particle, and it is equal to the work done by a force on an object to put it into motion. Kinetic energy is often referred to as the energy of motion and can be found in many forms, from the energy stored in objects such as a car or truck to the energy stored in the movement of electrons within an atom.

As the average kinetic energy of the molecules increases, the temperature of the object increases. Thus, a change in the average kinetic energy of the molecules of an object can be detected by measuring a change in the object's temperature.

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