how to determine the center of gravity of a lamina​

If you measure the average brightness and pulsation period of a cepheid variable star, you can also determine its distance.

Cepheid variable stars belong to a class of stars that have a distinct relationship between variation period and luminosity.

Their period of cycle and luminosity are closely related to each other and they differ in temperature and diameter.

As their brightness increases and decreases, therefore, it helps out in the measurement of intergalactic and interstellar distances.

The changes in amplitude of their motion and cycle period have a definite impact on their brightness which enables us to determine their distance.

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When heating a liquid on the stovetop the heated liquid become less dance and rises and the denser liquid things to the bottom this type of thermal energy transfer is called natural convection.

There are various type of thermal energy transfer methods like radiation, Convection and conduction. While heating a liquid on the stovetop, the less dense particles rises to the surface and the denser liquid sinks to the bottom. This method is called Convection method or natural convention method.

In this method, the actual movement of particle take place and the liquid particle which are heated rises upon the surface which allows the cool/denser to get heated and eventually allows the whole liquid to get heated and increase its temperature.

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The carbon isotope was cobined with the proton to produce the nitrogen isotope hence it is a fusion reaction.

The term nuclear fusion refers to a kind of reaction in which two nuclei fuse together to give rise to a single nuclei with the evolution of energy.

We can see that the carbon isotope was cobined with the proton to produce the nitrogen isotope hence it is a fusion reaction.

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Answer:

A. Nuclear fusion

Explanation:

got it right, trust

Answer:

One atom will give electrons to another atom to fill its shell, this is an ionic bond. The atom giving away electrons becomes positive and the one recieving electrons becomes negative.

Explanation:

Answer: One atom will give electrons to another atom to fill its shell, this is an ionic bond. The atom giving away electrons becomes positive, and the one receiving electron becomes negative.

Explanation:

I did the Gizmo.

The microscope has two sets of lenses, one in the eyepiece and one in the objective lens. The amount of light is changed by adjusting the diaphragm of the microscope. The diaphragm controls the amount of light that passes through the stage and is focused on the object being viewed.

There are two types of diaphragms in a microscope: the iris diaphragm and the disk diaphragm. The iris diaphragm is adjustable, while the disk diaphragm is preset. The iris diaphragm is located near the base of the microscope and can be adjusted to control the amount of light that enters the microscope. It works like a camera aperture, opening or closing to let in more or less light. When the iris diaphragm is closed, less light enters the microscope, and the image appears darker.

When the iris diaphragm is open, more light enters the microscope, and the image appears brighter. By adjusting the iris diaphragm, you can get the best possible image of the object being viewed. To summarize, the diaphragm is the part of the microscope that you adjust to change the amount of light. The iris diaphragm is adjustable, while the disk diaphragm is preset. By adjusting the diaphragm, you can get the best possible image of the object being viewed.

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Answer:

FN=-Fg -> Fg=mg -> Fg = 238 kg*9.8 m/s^2 ->

Fg = -2432.4 so FN = 2432.4 -> FF = μs*FN ->

FF = 0.22*2332.4 N -> FF = 513.128 ->

Fapplied > 513.128 N

Explanation:

...

They might cater to the views of their advertisers and subscribing customers.

option C.

A profit media company can be defined as a type media company that operates or functions with the primary aim of making profits.

The following are the general characteristics of media companies and they include;

They also monetize these products and services across various platforms such as television, radio, film, publishing, digital media, and more.

Thus, the main goal of for-profit media companies is to make money and this might contribute to bias in their reporting as they might cater to the views of their advertisers and subscribing customers.

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The current flowing in the circuit is 4 A.

The current flowing in the circuit is the rate of flow of charges per second.

The magnitude of the current flowing in the circuit can be calculated by applying Ohm's law as shown below.

V = IR

where;

The magnitude of the current is calculated as;

I = V/ R

I = 16 V / 4 ohms

I = 4 A

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Answer:

(a) She has traveled a total distance of 28958.04 m during the entire trip.

(b) Her average velocity for the trip is 6.12 m/s

Explanation:

Here is the complete question:

A bicyclist makes a trip that consists of three parts, each in the same direction (due north) along a straight road. During the first part, she rides for 26.8 minutes at an average speed of 7.57 m/s. During the second part, she rides for 42.4 minutes at an average speed of 3.17 m/s. Finally, during the third part, she rides for 9.69 minutes at an average speed of 15.0 m/s. (a) How far has the bicyclist traveled during the entire trip?  (b) What is her average velocity for the trip?

Explanation:

(a) To determine how far the bicyclist has traveled during the entire trip, we will calculate the distance she covered in each part of the trip, and then sum up the distances to determine the total distance covered.

During the first part, she rides for 26.8 minutes at an average speed of 7.57 m/s

That is,

Average speed, \(v\) = 7.57 m/s

and time, \(t\) = 26.8 minutes

Convert the time to seconds

∴ \(t\) = 26.8 minutes = (26.8 × 60) secs = 1608 secs

\(Average speed = \frac{Distance }{ Time}\)

Then, \(Distance = Average speed\) × \(Time\)

Hence, for the first part

\(Distance = 7.57\) × \(1608\)

\(Distance = 12172.56\) m

This is the distance covered in the first part of the trip.

During the second part, she rides for 42.4 minutes at an average speed of 3.17 m/s

That is, Average speed, \(v\) = 3.17 m/s

and time, \(t\) = 42.4 minutes

Convert the time to seconds

∴ \(t\) = 42.4 minutes = (42.4 × 60) secs = 2544 secs

From,

\(Distance = Average speed\) × \(Time\)

\(Distance = 3.17\) × \(2544\)

\(Distance = 8064.48\) m

This is the distance covered in the second part of the trip.

During the third part, she rides for 9.69 minutes at an average speed of 15.0 m/s

That is, Average speed, \(v\) = 15.0 m/s

and time, \(t\) = 9.69 minutes

Convert the time to seconds

∴ \(t\) = 9.69 minutes = (9.69 × 60) secs = 581.4 secs

From,

\(Distance = Average speed\) × \(Time\)

\(Distance = 15.0\) × \(581.4\)

\(Distance = 8721\) m

This is the distance covered in the third part of the trip.

Now for the distance covered during the entire trip,

Total distance = distance covered in the first part of the trip + distance covered in the second part of the trip + distance covered in the third part of the trip

Hence,

Total distance = 12172 m + 8064.48 m + 8721 m

Total distance = 28958.04 m

Hence, she has traveled a total distance of 28958.04 m during the entire trip.

(b) For her average velocity for the trip

Average velocity is given by

\(Average velocity = \frac{Total distance traveled}{Total time}\)

Total distance traveled = 28958.04 m

Total time = 1608 secs + 2544 secs + 581.4 secs

Total time = 4733.4 secs

Hence,

\(Average velocity = \frac{28958.04}{4733.4}\)

Average velocity = 6.1178 m/s

Average velocity ≅ 6.12 m/s

Answer:

10s

Explanation:

Given parameters:

Initial velocity  = 30cm/s

Acceleration  = 3cm/s²

Unknown:

Time it takes for the car to come to rest  = ?

Solution:

To solve this problem, we apply the right motion equation;

   Our final velocity - 0

So;

       V = U + at

Since the car is slowing down, it will have a negative acceleration

Insert the parameters and solve;

       0 = 30 + (-3) x t

          -30 = -t

              t = 10s

Answer:

girl what- I can't answer this but I need points so I'ma just put this random lol sorry tho . ask the tutor

The equivalent capacitance between terminals A and B of the circuit is 40 µF. Option A is the correct answer.

Calculation of the equivalent capacitance C for the capacitors in series and parallel using these formulae:

C series = C1 + C2 + C3 + … + Cn

C parallel = C1 + C2 + C3 + … + Cn

Given that the circuit has 4 capacitors of equal capacitance Co = Ce. The given circuit has 3 capacitors in series: C1, C2, and C3. Let the equivalent capacitance of C1, C2, and C3 be Cs. Capacitor C4 is in parallel to Cs, so we can calculate their equivalent capacitance Cp.

Cs = C1 + C2 + C3Cp = Cs + C4Cp = C1 + C2 + C3 + C4Capacitance Co = Capacitance Ce

For capacitors in series with the same capacitance, they have an equivalent capacitance Cs. For capacitors in parallel with the same capacitance, they have an equivalent capacitance Cp.

Cp = Cs + CoCp = Cs + CeC1 = C2 = C3 = Co = CeC1 = C2 = C3 = 10 µF

Substitute the value of the capacitance in the formula above. Cp = Cs + CeCp = 3Co + CoCp = 4CoCp = 4CeCp = 4 (10 µF)Cp = 40 µF

Hence, A is the correct option.

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If there are both electric and magnetic fields in the room and their effects on the charged particle cancel, and the electric field points upward, then the direction of the magnetic field is downwards.

The electric force on a charged particle is provided by an electric field, whereas the magnetic force is provided by a magnetic field. The effect of the electric and magnetic fields on the motion of the particle is a function of the relative directions and magnitudes of the two fields.

If the magnetic field is perpendicular to the electric field and the particle's velocity, the magnetic force is at right angles to both the electric force and the velocity, and it does not adjust the particle's speed. If the electric and magnetic forces on a charged particle are equal and opposite, they cancel each other out, resulting in no acceleration of the charged particle. Since the electric field is pointing upward, the magnetic field should be pointing downward.

In conclusion, the direction of the magnetic field is downward if the electric field is pointing upward, according to the given condition.

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The rate of heat removal from the eggs in kW is 89.25 kW.

To calculate the rate of heat removal from the eggs, we need to determine the total amount of heat transferred and the time it takes for the transfer.

The amount of heat transferred can be calculated using the equation:

Heat transferred (Q) = mass (m) * specific heat (c) * temperature change (ΔT)

Given:

Mass of each egg (m) = 0.13 kg

Specific heat of eggs (c) = 3.27 kJ/kg·°C

Temperature change (ΔT) = 30 °C - 10 °C = 20 °C

Q per egg = 0.13 kg * 3.27 kJ/kg·°C * 20 °C

Q per egg = 8.514 kJ

Now, let's determine the total heat transferred per minute:

Rate of heat transfer = Q per egg * number of eggs per minute

Rate of heat transfer = 8.514 kJ/egg * 630 eggs/minute

Rate of heat transfer = 5,354.82 kJ/minute

Rate of heat removal in kW = 5,354.82 kJ/minute / 60

Rate of heat removal in kW ≈ 89.25 kW

Therefore, the rate of heat removal from the eggs is approximately 89.25 kW.

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Answer:

Starting speed  Vo = 6.7 m/s

Explanation:

Given:

t = 9.0 s

S = 30 m

___________

V₀ - ?

The path is numerically equal to the area of  the figure lying under the velocity graph:

S = V₀* t / 2

Starting speed:

V₀ = 2*S / t = 2*30 / 9 ≈ 6.7 m/s

The process that involves lightening the hair and then recoloring to the desired color result is called the double-process.

Double-process is a two-step hair coloring process that involves lightening the hair to a pale blonde or platinum shade, then applying the desired color. This process is often used when the desired color is lighter than the natural hair color or when a vibrant color is desired.

The first step of the double-process involves applying a lightening agent, such as bleach or a high-lift color, to the hair. This is followed by a toner or a semi-permanent color to achieve the desired lightness. The second step involves applying the desired permanent color to the hair.

Double-process coloring can be damaging to the hair, so it's important to take proper precautions to minimize damage, such as using a deep conditioning treatment before and after the process, and spacing out appointments to give the hair time to recover.

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Answer:

The statement that best describes a physical change is:

"Changes can occur to certain physical properties of a substance, but the chemical composition of the substance remains the same."

A physical change refers to a change in the physical properties of a substance, such as its size, shape, color, or state of matter, without changing its chemical composition. This means that the atoms and molecules that make up the substance remain the same before and after the change.

Explanation:

The devices used to change speed, torque, and direction of travel are known as transmission.

Transmission is a machine that controls the application of power from the engine to the driveshaft. Transmission changes the speed, torque, and direction of travel of a vehicle or machine.

A transmission is a device that is used to control the power produced by the engine. The transmission system directs power from the engine to the wheels, enabling them to spin at the appropriate speed and torque.

The transmission changes the speed and torque ratio from the engine to the wheels, allowing the vehicle to travel at different speeds and move in different directions.

There are several types of transmission, including manual, automatic, continuously variable, and dual-clutch. Each type has its own set of characteristics and is suited for a particular type of vehicle and driving style.

Manual transmission, also known as stick-shift, requires the driver to manually shift the gears. It provides the driver with more control over the vehicle and is frequently used in sports cars and high-performance vehicles. It is also more fuel-efficient and cheaper to repair than an automatic transmission.

Automatic transmission is the most common type of transmission used in vehicles today. It does not require the driver to manually shift the gears and is easier to use. It provides a smooth and comfortable driving experience but is less fuel-efficient and more expensive to repair than a manual transmission.

Continuously variable transmission (CVT) is a type of automatic transmission that does not have fixed gears. It provides a smooth and seamless driving experience and is more fuel-efficient than an automatic transmission. It is commonly used in hybrid vehicles and small cars.

Dual-clutch transmission (DCT) is a type of automatic transmission that uses two clutches to switch between gears. It provides faster gear changes than a manual transmission and is commonly used in sports cars and high-performance vehicles.

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The fraction of the volume of the board above the surface of the water is approximately 0.35 or 35%.

1. First, find the volume of the board (V_board) using the formula: V_board = width * thickness * length. Convert the dimensions to meters:
V_board = 0.20 m * 0.05 m * 3.00 m = 0.03 m³

2. Calculate the mass of the board (m_board) using the formula: m_board = density * volume:
m_board = 650 kg/m³ * 0.03 m³ = 19.5 kg

3. Apply Archimedes' principle: the buoyant force (F_b) equals the weight of the displaced water. In equilibrium, the weight of the board (W_board) equals the buoyant force:
W_board = F_b
m_board * g = ρ_water * V_submerged * g

Here, g is the acceleration due to gravity (approximately 9.81 m/s²), and V_submerged is the volume of the submerged part of the board.

4. Cancel out g and solve for V_submerged:
V_submerged = (m_board / ρ_water) = (19.5 kg / 1000 kg/m³) = 0.0195 m³

5. Find the fraction of the volume submerged (f_submerged) and the fraction above the water (f_above) by dividing V_submerged by V_board:
f_submerged = V_submerged / V_board = 0.0195 m³ / 0.03 m³ = 0.65

f_above = 1 - f_submerged = 1 - 0.65 = 0.35

The fraction of the volume of the board above the surface of the water is approximately 0.35, or 35%.

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If the weight of the object is 1.0 N and the pivot point is at the center of mass, then the torque on the object due to the weight is zero.

Torque is the product of force and the lever arm, which is the perpendicular distance from the pivot point to the line of action of the force. In this case, the weight of the object acts directly through the center of mass, which is the same as the pivot point. Therefore, the lever arm is zero and the torque due to the weight is also zero.

In order for an object to be in static equilibrium, the net torque on the object must be zero. This means that the sum of all the torques acting on the object must be zero. In this case, since the torque due to the weight is zero, the object will be in static equilibrium as long as there are no other torques acting on it.

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Radar guns are used to measure the speed of moving objects, Radar guns work by projecting radio waves of known frequencies into moving objects. The radar gun able to calculate the speed of a moving object using radio waves by  B. Radar guns work by emitting radio waves of known frequency towards a moving object.

These waves reflect off the moving object and the frequency of the reflected waves is different from the frequency of the emitted waves due to the Doppler effect. The software in the radar gun analyzes this change in frequency and calculates the speed of the moving object based on the Doppler shift. This is known as a radar speed gun.

The radar gun is able to determine the speed of the moving object by comparing the frequency of the reflected waves to the frequency of the emitted waves. The difference in frequency is proportional to the speed of the moving object. The software then uses this information to calculate the speed of the object and display it on the radar gun's screen. This technology is commonly used by law enforcement to detect and track speeding vehicles. So therefore the correct answer is option B. Radar guns work by emitting radio waves of known frequency towards a moving object.

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The statement that is true is: "The higher the velocity of a projectile, the larger the cavity it produces."low-velocity injuries produce extensive temporary wound channels. there are four levels of velocity.

A projectile is an object that is thrown, launched, or shot through the air and travels in a parabolic path under the influence of gravity. It can be a solid, liquid, or gas and can be propelled by various means such as a gun, bow, and arrow, or even by throwing with one's own body. The trajectory of a projectile is determined by its initial velocity, angle of projection, and the force of gravity acting upon it. Understanding the principles of projectile motion is important in a variety of fields, such as engineering, physics, and sports. Projectile motion is also affected by air resistance and other external factors, making it a complex area of study.

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The process of determining each of the forces that combine to make up a resultant force is called force decomposition or vector resolution.

Force decomposition, also known as vector resolution, is a process used in physics to analyze and determine individual forces that make up a combined, resultant force. This process involves breaking down a single vector, which represents the total force, into its component vectors, which represent individual forces acting on an object. By doing so, we can better understand how each force contributes to the overall motion and behavior of an object.

To perform force decomposition, we typically use trigonometry and vector algebra to determine the magnitudes and directions of the individual forces. This information can then be used to analyze the forces at play in various physical scenarios and to make predictions about the object's behavior.

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A person shakes a sealed, insulated bottle containing coffee for a few minutes, then the change in the temperature of the coffee increases slightly.

The temperature of the coffee increases when insulated bottle is sealed and shaken because the exchange of heat from the surrounding from the thermos bottle is zero. From the first law of thermodynamics, the work done on system is equal to the change in internal energy.

As thermos flask is insulated, therefore no heat energy is added to the system,

Therefore, △Q=0

Work is done  by shaking it against viscous force.

Now, △w=−ve

Internal energy , △U=△Q−△w=0−(−△w)

△U=+△w

So, △U=+ve

Hence, temperature of the system increases due to the increase in internal energy.

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Given:

The applied force is F = 23 N

The mass of the object is m = 7 kg

The object moves with a constant velocity of v = 6.1 m/s

The acceleration due to gravity is g = 10 m/s^2

Required: The coefficient of friction between the object and the surface.

Explanation:

The object moves at a constant velocity, so the acceleration will be zero.

The equation of motion can be written as

So, the applied force will be equal to the frictional force.

The coefficient of friction can be calculated as

On substituting the values, the coefficient of friction will be

Thus, the coefficient of friction is 0.33

Final Answer: The coefficient of friction between the object and the surface is 0.33.

Answer:

They have mass is always true.

Answer:

“they have mass” because if they don’t have mass they can’t exert force even if they have speed if they have no mass they can’t do anything or exert force

Explanation: