3) when is the angular momentum of a system constant?

mechanical energy

Explanation:

its right

Answer:

lol i went by 1 cubic inches and the answer i got was 91.3834

Explanation:

Answer:

F' = 64 F

Explanation:

The electric force between charges is given by :

\(F=\dfrac{kq_1q_2}{r^2}\)

Where

q₁ and q₂ are charges

r is the distance between charges

When  each charge is doubled and the distance between them is 1/4 its original magnitude such that,

q₁' = 2q₁, q₂' = 2q₂ and r' = (r/4)

New force,

\(F'=\dfrac{kq_1'q_2'}{r'^2}\)

Apply new values,

\(F'=\dfrac{k\times 2q_1\times 2q_2}{(\dfrac{r}{4})^2}\\\\=\dfrac{k\times 4q_1q_2}{\dfrac{r^2}{16}}\\\\=64\times \dfrac{kq_1q_2}{r^2}\\\\=64F\)

So, the new force becomes 64 times the initial force.

The molar mass of a compound can be found by adding the molar masses of all of the atoms in the compound.

The molar mass of an atom can be found on the periodic table by looking at the atomic mass listed for that element.

For example, to find the molar mass of water (H2O), we would add the molar masses of two hydrogen atoms (2 x 1.01 g/mol) and one oxygen atom (16.00 g/mol) to get a total molar mass of 18.02 g/mol.

Another way is by finding the molecular formula of the compound, it can be done by analyzing the compound's chemical and physical properties and then using the mass spectrometer to determine the molecular weight.

In conclusion, the molar mass of a compound can be found by adding the molar masses of the atoms in the compound using the atomic masses listed on the periodic table, or by determining the molecular formula of the compound and using a mass spectrometer to find the molecular weight.

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Answer:

Constructive interference

Explanation:

Answer:

C. Constructive interference

Explanation:

The output current is 0.38A and the voltage on the secondary coil is 10V in a transformer.

a) Using the formula for transformer voltage ratio, we can find the voltage on the secondary coil:
V1/V2 = N1/N2
Where V1 is the voltage on the primary coil (120V), V2 is the voltage on the secondary coil (unknown), N1 is the number of turns in the primary coil (408), and N2 is the number of turns in the secondary coil (34).
120/V2 = 408/34
Simplifying this equation, we get:
V2 = (34/408) x 120V = 10V
Therefore, the voltage on the secondary coil is 10V.
b) Using the formula for transformer current ratio, we can find the output current:
I2/I1 = N1/N2
Where I1 is the current on the primary coil (4.50A), I2 is the current on the secondary coil (unknown), N1 is the number of turns in the primary coil (408), and N2 is the number of turns in the secondary coil (34).
I2/4.50A = 34/408
Simplifying this equation, we get:
I2 = (34/408) x 4.50A = 0.38A (rounded to two decimal places)
Therefore, the output current is 0.38A.

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Answer: The part of the microscope that is the circular area is the APERTURE

I hope this helped!

One possible trigonometric function that models the ocean tide for a period of 12 hours is:
y = A*cos(2πt/12 + φ) + B

In this trigonometric function, y represents the water level (in meters) at a given time t (in hours), A represents the amplitude (in meters) of the tide, φ represents the phase shift (in radians) that determines the starting point of the tide cycle, and B represents the average water level (in meters) at the location.
The cosine function is used because it is a periodic function that oscillates between -1 and 1, which is similar to the behavior of ocean tides. The coefficient 2π/12 in the argument of the cosine function represents the frequency (in cycles per hour) of the tide, which is equal to one cycle every 12 hours. The phase shift φ can be adjusted to match the observed data or the expected behavior of the tide. The amplitude A can be determined by measuring the difference between the highest and lowest water levels over a full cycle of the tide.
Of course, this is just one possible model for ocean tides, and there are many factors that can affect the actual behavior of tides, such as the geography of the coastline, the gravitational pull of the moon and sun, and the wind and weather patterns. So, it is important to gather as much data as possible and to refine the model accordingly.

Therefore, y = A*cos(2πt/12 + φ) + B is a trigonometric function that models the ocean tide for a period of 12 hours.

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False. The grounded neutral of a balanced 3-wire delta circuit or balanced 4 wire wye circuit is not considered a current carrying conductor.

Current flows through the phase conductors in the circuit, and the grounded neutral serves as a reference point and a path for fault current to return to the source.

In a balanced system, the currents in each phase are equal in magnitude and evenly distributed, resulting in a net current of zero in the neutral conductor. Therefore, the grounded neutral is not considered a current-carrying conductor in this situation. It is typically used as a reference point for voltage measurements and as a return path for unbalanced current in the circuit. The current is carried by the other two or three conductors in the circuit.

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In order to compare the eletrostatic forces, let's calculate each one using the formula:

Where k = 9 * 10^9, q1 and q2 are the charges and r is the distance between them.

So we have:

So the weakest force is the one in the third case (bottom left option): charges of -3 uC and +3 uC, and distance of 3 meters.

Answer:

The SI unit of Area is meter square (represent as m2)

The SI unit of pressure is one newton per square metre ( represent as N/m2).

Answer:

dont know

Explanation:

need points

Answer:

In the human thoughts, there is possible and impossible. In God's world everything is possible. If you keep thinking this you'll never start to study. Just get up, open the book and start to study like you do. Believe in yourself!

EAC( Low-energy lightbulb )=18.47 EAC( Conventional lightbulb )=7.33 Conventional lightbulb is cheaper to operate. Option D

To calculate the Equivalent Annual Costs (EAC), we need to consider the initial cost, maintenance costs, and the present value of future costs, taking into account the discount rate.

The EAC (Equivalent Annual Cost) is calculated by summing up the annual costs of the lightbulb over its lifetime, discounted at the real discount rate of 4%.

For the low-energy lightbulb:

EAC = Cost of bulb + Present value of annual electricity cost

= $3.60 + ($2.00 / (1 + 0.04)^1) + ($2.00 / (1 + 0.04)^2) + ... + ($2.00 / (1 + 0.04)^9)

≈ $18.47

For the conventional lightbulb:

EAC = Cost of bulb + Present value of annual electricity cost

= $0.60 + ($7.00 / (1 + 0.04)^1) + ($7.00 / (1 + 0.04)^2) + ... + ($7.00 / (1 + 0.04)^1)

≈ $7.33

Since the EAC for the low-energy lightbulb is $18.47 per year and the EAC for the conventional lightbulb is $7.33 per year, the conventional lightbulb is cheaper to operate assuming a burnt-out bulb is replaced by an identical bulb.

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Answer: Force

In physical science, a force is something that acts on an object by pushing or pulling it. If the force is strong enough, it changes the position or shape of the object. Forces such as friction, air resistance and simple physical contact touch the object directly, while forces like gravity, magnetism and electrostatics act on the object from a distance. Force is a vector quantity, meaning you can measure both its strength and its direction. The formula to find the measure of a force is force = mass times acceleration, written as f = ma.

Velocity

The faster something is moving, the higher its velocity.

When an object is moving, one way to measure how fast it is moving is by finding its velocity, which is the rate at which it is changing position. Like force, velocity is a vector quantity, so it includes direction. To find the average velocity of an object, divide the change in its position by the time the movement took, and state its direction. For example, if a car is driving north and in one hour's time it travels 30 miles, its velocity is 30 miles per hour, north.

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Answer:

it A texture and colour I

Explanation:

I just did this

Answer:

Shapes and space

Explanation:

3D crafts use shapes and space.

The purpose of space: Distance, area, volume; physical space independent of what occupies it; absolute space.

The purpose of shapes: Positive and negative

Positive shape is the totality of the mass lying between its contours; in three-dimensional work, the visible shape or outer limit of a form changes as the viewer's position is changed. These outer limits are seen as shapes moving back and forth between major contours.

Negative space is empty space defined by a positive shape. Sometimes referred to as occupied and unoccupied space.

Following are the differences between substance and mixture

A material is said to be pure if it just contains that substance and cannot be broken down into any other components. It is possible to separate a mixture into two or more pure substances. Pure substances have distinct physical and chemical properties, whereas mixtures have various qualities depending on the pure substance amounts and placement within each mixture.

Pure substances might be molecules made up of two or more different elements, or they can be elements composed solely of one type of atom. Depending on how thoroughly the components are combined, mixtures can either be homogeneous or heterogeneous.

Following are the differences between element and compound

Compounds are chemical unions of two or more elements and can potentially be pure substances, whereas elements are invariably pure things. Real-world substances, such as elements and compounds, are rarely pure because they are frequently tainted during manufacturing, storage, or by their environment. In theory, pure denotes the absence of any discernible imperfections. The majority of the time, it is achievable to purify substances to that standard, albeit it frequently necessitates a lot of work.

Following are the differences between heterogeneous and homogeneous mixtures.

Mixtures can be physically separated since they contain multiple types of atoms and molecules. When a combination is homogenous, the particles are so small that the entire mixture appears to be formed of the same substance. When a mixture is heterogeneous, the qualities of the mixture vary depending on which section of the mixture is being analyzed. Typical homogeneous mixtures include solutions. For instance, a salt-water solution is a homogenous combination since it is possible to separate the water and salt using distillation to create pure water and crystalline salt.

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Answer:

The pressure of the air molecules inside the pen cap increases and the volume occupied by the air decreases such that the combined volume occupied by the pen cap and the air volume reduces while the combined mass of the pen cap and the air molecules remain the same

Given that density = The mass/Volume, we have that the density varies inversely as the volume, and as the volume reduces, the density increases

Upon squeezing, therefore, as the new combined density of the pen cap and the air molecules rises to more than the density of the water in the bottle, then, the pen cap air molecule is relatively more denser than the water, which will result in the pen cap sinking to the bottom of the bottle

Explanation:

Concrete must be carefully poured, mixed, cured, and tested to assure a safe building material. Option three is the most suitable answer

A cement is a binder, a substance used for construction that sets, hardens, and adheres to other materials to bind them together. Cement is seldom used on its own, but rather to bind sand and gravel together.

There are four stages in the manufacture of port land cement:

1) crushing and grinding the raw materials

2) blending the materials in the correct proportions

3) burning the prepared mix in a kiln

4) grinding the burned product, known as “clinker,” together with some 5 percent of gypsum (to control the time of set of the cement).

The three processes of manufacture are known as

a) wet

b) dry

c) semidry processes

So termed when the raw materials are ground wet and fed to the kiln as a slurry, ground dry and fed as a dry powder, or ground dry and then moistened to form nodules that are fed to the kiln.

The whole paragraph is a process that ensures formation of good quality cement and ensures formation of quality structures which are capable of withstanding time.

Therefore, Option three is the most suitable answer , Concrete must be carefully poured, mixed, cured, and tested to assure a safe building material.

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The viscosity of the experimental lubricant is 83.63 cP. The calculated viscosity can be confirmed by comparing it with known viscosity values and conducting additional tests for validation.

To calculate the viscosity of the liquid, we can use the formula for terminal velocity in a viscous medium. The terminal velocity (V) is given by the equation V = (2/9)(g)(r^2)(ρb - ρl) / η, where g is the acceleration due to gravity, r is the radius of the ball, ρb is the density of the ball, ρl is the density of the liquid, and η is the viscosity of the liquid.

Rearranging the formula, we can solve for viscosity η, which gives us η = (2/9)(g)(r^2)(ρb - ρl) / V.

Plugging in the given values, we have g = 9.8 m/s^2, r = 0.001 m, ρb = 2120 kg/m^3 (converted from 2.12 g/cm³), ρl = 1060 kg/m^3 (converted from 1.06 g/cm³), and V = 0.0138 m/s (converted from 1.38 cm/s).

Substituting these values into the formula, we can calculate the viscosity in cP (centipoise) by multiplying the result by 1000, giving us 83.63 cP. To validate the calculated viscosity, it is important to compare it with known viscosity values for similar lubricants and conduct additional tests to ensure consistency and accuracy.

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Answer:

The formula for calculating Density is:

= Mass / Volume

From this formula, we can say that the relationship between Mass and Density is a direct one. In other words, if mass is increasing - all else being equal - then density will increase as well.

If mass however was decreasing, density would have to decrease as well.

For example, assume 3 bricks have masses of 5kg, 10kg and 15kg. Also assume that the bricks all have the same volume of 5 m³.

Density of 5kg brick = 5 / 5 = 1 kg/m³

Density of 10kg brick = 10 / 5 = 2kg / m³

Density of 15kg brick = 15 / 5 = 3 kg /m³

Notice how density increases as mass increases and decreases when mass decreases.

All electromagnetic waves travel at the same speed in a vacuum, which is 300,000 km/sec (186,000 mph). This results from the electromagnetic waves' oscillating nature.

In general, we say that light moves in waves and that all electromagnetic radiation moves through a vacuum at a speed of around 3.0 * 108 meters per second. Nothing can move faster than the speed of light, which is what we refer to as.

The universal scientific constant known as c—the speed of light in a vacuum—is significant in many branches of physics. The exact value of the speed of light, c, is 299,792,458 meters per second.

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Answer: Kinetic energy is the energy an object has because of its motion

(if it needs to be a one worded answer than just type motion)

The potential energy of an object depends on its mass and its height.

The law of conservation of energy states that energy can be neither created nor destroyed, but it can change its form.

Answer:Kinetic energy is the energy an object has because of its motion. If we want to accelerate an object, then we must apply a force. Applying a force requires us to do work.

As expressed by the equation, potential energy depends upon the mass and the height of the object. Any increase in these two quantities will lead to an increase in the amount of potential energy possessed by the object.

The law of conservation of energy states that energy can neither be created nor destroyed - only converted from one form of energy to another. This means that a system always has the same amount of energy, unless it's added from the outside.

The mass of the sample of silver is approximately 21.4 grams.

To calculate the mass of the silver sample, we can use the formula for heat transfer:
q = mcΔT
where q is the heat transferred (255 J), m is the mass of the sample (which we want to find), c is the specific heat capacity of silver (235 J/kg°C), and ΔT is the change in temperature (23.1°C).
Rearranging the formula to solve for mass (m):
m = q / (cΔT)
Plugging in the given values:
m = 255 J / (235 J/kg°C × 23.1°C)
m ≈ 0.0214 kg
To convert to grams, multiply by 1000:
m ≈ 21.4 grams

Summary: When 255 J of heat was applied to a sample of silver, and its temperature increased by 23.1°C, the mass of the sample was approximately 21.4 grams.

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The  distance from Earth to the sun is approximately 1.5 x 10^8 kilometers.

To convert miles to kilometers, we can use the conversion factor 1 mile = 1.609344 kilometers.

So, to find the distance from Earth to the sun in kilometers, we can multiply the given distance in miles by the conversion factor:

d (km) = 9.3 x 10^7 miles x 1.609344 km/mile
d (km) = 1.496 x 10^8 km

Therefore, the distance from Earth to the sun is approximately 1.5 x 10^8 kilometers.

The closest answer choice is A) 1.5 x 10^8 km, which is the correct answer.

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Answer:

thanks

Explanation:

The correct answer is C. greater than the speed of sound.

A sonic boom is a loud, explosive sound caused by the shock waves that are generated when an object travels through the air at or above the speed of sound. When an airplane flies through the air, it creates pressure waves that move outward in all directions.

As the plane reaches the speed of sound, these pressure waves combine to create a single shock wave that moves along with the aircraft. The shock wave produces a sudden change in air pressure, resulting in the characteristic loud noise of the sonic boom.

The speed of sound is dependent on various factors such as altitude, temperature, and humidity, but at sea level, it is approximately 1,225 kilometers per hour (761 miles per hour). So, an airplane traveling at a speed greater than 1,225 kilometers per hour (761 miles per hour) would create a sonic boom.

As the airplane exceeds the speed of sound, the shock wave produced moves away from the aircraft and eventually reaches the ground, where it is heard as a loud boom by observers on the ground.

However, if an aircraft is traveling just below the speed of sound, the pressure waves created by the aircraft do not combine to form a single shock wave. Instead, they move away from the aircraft as separate pressure waves, resulting in a series of smaller sonic booms, which are not as loud as a single, larger sonic boom.

In summary, an airplane flying at a speed greater than the speed of sound creates a sonic boom that can be heard by observers on the ground.

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The thick distribution of hot gases and stars surrounding the center of a galaxy is called the galactic bulge.

The bulge is a key component of spiral and barred spiral galaxies, including our own Milky Way. It is characterized by a dense concentration of stars, gas, and dust, which makes it appear as a bright, central region in the galaxy.

The galactic bulge is primarily composed of older, red stars, but it can also contain younger, blue stars and star-forming regions. This area has a higher rate of star formation compared to the galactic disk due to its higher density of gas and dust. The bulge's shape can be influenced by the gravitational interaction between stars and the presence of a central supermassive black hole, which is common in most galaxies.

Understanding the galactic bulge is crucial for astronomers to study the formation, evolution, and structure of galaxies, as well as to investigate the role of central black holes in shaping their host galaxies.

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