galilea was the first scientist to do which of the following

Following the image of the ball that have been shown;

1. Potential energy

2. Kinetic energy

3. Kinetic energy

4. Potential energy

5. Kinetic energy

6. Kinetic energy

7. Kinetic energy

Due to its position or elevation, an object has potential energy while it is at rest or is elevated above the ground. Depending on the circumstances, this potential energy may either be elastic or gravitational.

Kinetic energy, or the energy connected to motion, is present when an item is in motion. An object's kinetic energy is determined by its mass and velocity .

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Answer:

1: Potential and kinetic

2: Potential and kinetic

3: Potential and kinetic

4: potential

5: Potential and kinetic

6: Potential and kinetic

7: NEITHER

Explanation:

4 is potential because its the highest point

7 is neither because the question states "the image shows the path of a ball from the time it's thrown to the time it lands on the ground" so... 7 is when the ball has landed on the ground. therefore it has neither potential nor kinetic because it is resting.

Answer:

Explanation: If a net force of 50 N pulls on a 10 kg object, how much acceleration will it cause? Then an answer is possible. Equation: Net force = mass * acceleration.

Answer:

all I know is C

are there more questions? anyone?

-KARL IS STOOPID

Explanation:

The question "What happens when an unstoppable force meets an immovable object?" is a paradox that cannot be resolved logically.

If an unstoppable force is moving towards an immovable object and collides with it, the force will stop moving. Similarly, if an immovable object is struck by a force, it will not move.

This paradox raises the issue of what happens when two opposing ideas are brought together.

What occurs when an unstoppable force meets an immovable object is a paradox. The question is illogical, and no answer can be given with certainty.

The term "unstoppable force" indicates something that cannot be stopped, while the term "immovable object" refers to something that cannot be moved.

When put together, the two phrases contradict each other.

In this scenario, if an unstoppable force encounters an immovable object, it would imply that the force cannot move forward and the immovable object cannot move or be moved.

Hence, it is a paradox.

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Answer:

I am not very sure of the first question

The second one which is why it discarted it is that because someone named Friedrich Wohler showed that it was possible to obtain an organic compound in the laboratory.

Answer:

umm im confused

Explanation:

Answer:

larger mass more the molecule more heat absorbed

and vice versa .Thats the reason ok?

Once charge has been transferred onto the plates of a capacitor, the electric field between the plates is established, causing a potential difference to be created across the capacitor. This potential difference, or voltage, is directly proportional to the amount of charge stored on the plates.

Given data ,

The capacitor's stored charge can flow across a closed circuit, creating a current, if it is linked to one. The capacitor is being discharged throughout this procedure.

When the circuit is interrupted, the charge on the plates stays constant, and the capacitor keeps its charge until it is depleted or until it leaks away owing to flaws in the leads or dielectric material.

Charge flows onto the plates of an initially uncharged capacitor when a voltage source is attached to it until the potential difference across the capacitor equals the voltage of the source. The capacitor is considered to be completely charged at this moment since the charge flow has stopped.

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The answer to the given question is option C: 40.4°F. Let's see the explanation below.How to find the temperature difference across a properly operating electric furnace?

]We know that the temperature difference across a properly operating electric furnace is given by:ΔT = (Q / (1.08 * CFM))where,Q is the rate of heat input in BTU/hr,1.08 is the factor to convert CFM to lb/min,and CFM is the rate of air flow in cubic feet per minute.So, here,ΔT = (Q / (1.08 * CFM))

Given,The rate of heat input = 10 kW = 34,120 BTU/hrThe rate of air flow = 900 CFMPlugging these values in the above equation, we get:ΔT = (34,120 / (1.08 × 900))ΔT = 40.4°FTherefore, the temperature difference across a properly operating electric furnace that is using a 10-kW electric heater and is moving 900 cfm of air is 40.4°F. Hence, the main answer is option C.

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The temperature difference across the electric furnace is approximately 30.2°F (option A).

To calculate the temperature difference across the electric furnace, we can use the formula:

Temperature difference (ΔT) = Heat (Q) / (Airflow rate * Specific heat capacity * Density)

First, let's convert the power of the electric heater from kilowatts (kW) to watts (W):

10 kW = 10,000 W

Next, we need to determine the specific heat capacity of air. Typically, it is around 0.24 BTU/lb°F.

Since the given airflow rate is in cubic feet per minute (cfm), we need to convert it to pounds per minute (lb/min) using the density of air. The density of air at standard conditions is approximately 0.075 lb/ft³.

Converting 900 cfm to lb/min:

900 cfm * 0.075 lb/ft³ = 67.5 lb/min

Now we can substitute the values into the formula:

ΔT = 10,000 W / (67.5 lb/min * 0.24 BTU/lb°F * 0.075 lb/ft³)

Simplifying the equation:

ΔT = 10,000 W / (67.5 * 0.24 * 0.075) (lb/min * BTU/lb°F * lb/ft³)

Calculating the result:

ΔT ≈ 30.2°F

Therefore, the temperature difference across the electric furnace is approximately 30.2°F, which corresponds to option A.

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Nichrome is used as a heating element in electric irons

High resistance: Nichrome has a high electrical resistance, which means that it converts electrical energy into heat energy efficiently. This makes it ideal for use in heating elements where heat generation is the primary requirement.

Good temperature stability: Nichrome has a high melting point and a low coefficient of thermal expansion. This means that it can maintain its structural integrity even at high temperatures and does not deform or break easily.

Corrosion resistance: Nichrome is resistant to corrosion, which makes it suitable for use in electrical appliances that are exposed to moisture, such as electric irons.

Long lifespan: Nichrome has a long lifespan and does not degrade easily even with repeated use. This makes it a reliable and durable choice for heating elements.

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Answer:

D3

Explanation:

To determine the note, you will have to find the frequency of that sound wave

frequency is no. of cycles or oscillation that occurs per second

so according to the question for 3 oscillations, it took 20ms which is 20 × 10^-3 seconds then for 1 second that'd be

3×10^3 ÷ 20 = 150 Hz

then the note corresponding to frequency is D3

The wavelength of an electron with a mass of 9.11 x 10^-28 g that has been accelerated to a speed of 2.1 x 10^7 m/s is 1.23 x 10^-10 meters.

To find the wavelength of an electron that has been accelerated to a speed of 2.1 x 10^7 m/s, we can use the de Broglie equation:

wavelength = h / mv

where h is Planck's constant (6.626 x 10^-34 J*s), m is the mass of the electron (9.11 x 10^-28 g), and v is the velocity of the electron (2.1 x 10^7 m/s).

First, we need to convert the mass of the electron from grams to kilograms:

m = 9.11 x 10^-28 g = 9.11 x 10^-31 kg

Now we can plug in the values into the equation:

wavelength = h / mv
wavelength = 6.626 x 10^-34 J*s / (9.11 x 10^-31 kg)(2.1 x 10^7 m/s)
wavelength = 1.23 x 10^-10 m

Therefore, the wavelength of an electron with a mass of 9.11 x 10^-28 g that has been accelerated to a speed of 2.1 x 10^7 m/s is 1.23 x 10^-10 meters.

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Answer:

2ms-¹ means that the body under consideration moves 2m in a second, and may be it will continue to move 2m in every 1 second, if there's no external unbalanced force acting on that body (those forces do include frictional forces). mark its brainlist plz. Kaneppeleqw and 6 more users found this answer helpful. Thanks 3.

Answer:

that the student has travels 2 meters every 1 second that passes

After considering the given data we conclude that the wavelength of visible light emitted by a hydrogen atom when its excited electron drops from n = 6 to n = 2 is approximately 102.55 nm.

To evaluate the wavelength (in nm) of visible light emitted by a hydrogen atom when its excited electron drops from n = 6 to n = 2, we can apply the Rydberg formula:
\(1/\lambda = R(1/n_1^{2} - 1/n_2^{2} )\)
Here:
λ = wavelength of the emitted light
R = Rydberg constant \((1.097 *10^7 m^{-1} )\)
\(n_1\) and \(n_2\) = initial and final energy levels of the electron
Applying substitution of the given values, we get:
\(1/lambda = (1.097 * 10^7 m^{-1} )(1/6^{2} - 1/2^{2} )\)
Evaluating for λ, we get:
λ = 102.55 nm
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The diameter of the disk would need to be approximately 1.08 m to store 13.7 MJ of kinetic energy when spinning at 92.0 rpm. The centripetal acceleration of a point on the rim of the disk would be approximately 332.6 m/s².

The moment of inertia of a uniform disk rotating about an axis perpendicular to the disk through its center is given by the formula:

I = (1/2) * M * R²

where I is the moment of inertia, M is the mass of the disk, and R is the radius of the disk.

The mass of the disk can be calculated using its volume and density:

M = ρ * V =

= ρ * π * R² * h

where ρ is the density of the iron, π is the mathematical constant pi, R is the radius of the disk, and h is the thickness of the disk.

Substituting the given values, we get:

M = 7800 kg/m³ * π * (0.116 m/2)² * 0.116 m

M = 8.4 kg

The kinetic energy of the spinning disk can be calculated using the formula:

K = (1/2) * I * ω²

where K is the kinetic energy, I is the moment of inertia, and ω is the angular velocity of the disk.

Substituting the given values, we get:

13.7 MJ = (1/2) * (8.4 kg * (0.116 m/2)²) * (92.0 rpm * 2π/60)²

Solving for R, we get:

R = 0.539 m

The centripetal acceleration of a point on the rim of the disk can be calculated using the formula:

a = ω² * R

where a is the centripetal acceleration, ω is the angular velocity of the disk, and R is the radius of the disk.

Substituting the given values, we get:

a = (92.0 rpm * 2π/60)² * 0.539 m

a = 332.6 m/s²

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Answer:

Projectile motion is the motion of an object thrown or projected into the air, subject to only the acceleration of gravity. The object is called a projectile, and its path is called its trajectory. The motion of falling objects, as covered in Problem-Solving Basics for One-Dimensional Kinematics, is a simple one-dimensional type of projectile motion in which there is no horizontal movement. In this section, we consider two-dimensional projectile motion, such as that of a football or other object for which air resistance is negligible.

Explanation:

B the dropped ball

Explanation:

The average speed of a modern cruise ship is roughly 20 knots (23 miles per hour), with maximum speeds reaching about 30 knots (34.5 miles per hour).

If the cornea, which serves as a border between the aqueous humor and the air, has a focal length of 3.0 cm, its radii is equal to 0.76 cm.

The radius of curvature of both the spherical mirror is the diameter of the hollow sphere that contains the object that serves as the mirror. The radius of curvature of a spherical mirror is, in other language, the distance between its pole and center of curvature.

Let's calculate the distance in meters (m) and the time in minutes (sec). Then, the units for torsion and curvature are both m1. Explanation #1, which is short and nasty but at least accounts for curvature: As you are likely aware, the radius of a circle has a curvature of 1/r.

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The reaction force applied by the floor of the elevator on the cardboard box is 93.1N.

The mass of the cardboard box is 4.75 kg.

The elevator is moving in the upward direction with an acceleration of g.

According to Newton's law of motion, each and every action has an equal and opposite reaction.

Now, the reaction force that is going to be applied on the box by the floor of the accelerating elevator will be equal to that of the weight of the box felt by the floor of the elevator.

The net acceleration of the box is (g+g),

Net acceleration = 2g.

Now, the weight W of the boc,

W =4.75(2g)

W = 4.75 x 2 x 9.8

W = 93.1 N.

The reaction force Fₙ₂ on the box is 93.1 N.

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Complete question-A cardboard box rest on the floor of the elevator. The box has a mass m = 4.75 kg and the elevator has an upward acceleration a,  if the elevator's acceleration had a magnitude of g in the upward direction, what would the normal force fn2 be in newtons?

The current in the flashlight is 0.50 A, and the voltage is the sum of the voltages of the three individual batteries of 2.3 W & 4.1×\(10^2\) electric energy is delivered to the bulb.

To calculate the power delivered to the bulb of the flashlight:

Power (P) = Current (I) * Voltage (V)

Power (P) = 0.50 A * 4.5 V

Power (P) = 2.25 W

Hence the delivered power is 2.25 W.

To calculate the electric energy delivered to the bulb, we can use the formula:

Time (t) = 3.0 min * 60 s/min

Time (t) = 180 s

Electric Energy (E) = 2.25 W * 180 s

Electric Energy (E) = 405 J

So, the electric energy delivered to the bulb is 405 J.

Thus, the correct answer is option: 2.3 W & 4.1×\(10^2\) .

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"Power electronics" includes inverters, charge controllers, rectifiers, chargers, dc-dc converters, maximum power point trackers, and power quality equipment.

Power electronics refer to the field of engineering that deals with the conversion, control, and conditioning of electrical power using electronic devices. This field plays a crucial role in various applications, including renewable energy systems, electric vehicles, power supplies, and industrial automation.

Within the context of the question, power electronics devices such as inverters are used to convert DC power to AC power, charge controllers regulate the charging of batteries from solar panels,

rectifiers convert AC power to DC power, chargers replenish the energy stored in batteries, dc-dc converters convert DC voltage levels, maximum power point trackers optimize the power output of solar panels, and power quality equipment ensures the stability and reliability of the power supply.

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Answer:

First of all you should give more then 5 points for this.And the errors are you should add a space between all of the steps and info of the lab. And read everything over again and where you take a breath at or if you stop add a coma or a period.

According to the given statement the swimmer will travel 21.53 m from her starting point.

One of the variations is when the boat goes downstream in the same direction as the river. We refer to this as the upstream motion. However, we refer to the motion of a boat traveling upstream when it's doing inside the opposite direction as a stream or river.

Speed of swimmer in still water = Speed along river's width = 1.20 m/s

Thus, the swimmer's time to cross the river was 47/1.20, or 39.16 seconds.

Consequently, the swimmer is moving at 0.55 m/s downstream for 39.16 seconds.

During that period, the distance was equal to 0.55 * 39.16, or 21.53 m.

As a result, the swimmer will travel 21.53 m from her starting point.

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The complete question is -

A swimmer is capable of swimming 1.20 m/s in still water, if she is to arrive at a point directly across the stream of a 47- m -wide river whose current is 0.50 m/s, how far downstream (from a point opposite her starting point) will she land?

Answer: the answer given below

(a) Explanation: The impulse on an object is given by the change in momentum of the object. Before the collision, the bullet has momentum p1 = mv0 and the brick has momentum p2 = 0, since it is stationary. After the collision, the combined bullet-brick system has momentum p3.

Conservation of momentum requires that the total momentum before the collision is equal to the total momentum after the collision:

p1 + p2 = p3

mv0 + 0 = (m + M)V

where V is the velocity of the combined bullet-brick system after the collision. Solving for V, we get:

V = (mv0) / (m + M)

The impulse on the bullet during the collision is equal to the change in momentum of the bullet:

J_bullet = p3 - p1 = (m + M)V - mv0

Substituting the expression for V we found earlier:

J_bullet = (m + M)(mv0) / (m + M) - mv0 = 0

Therefore, the impulse on the bullet is zero during the collision.

On the other hand, the impulse on the brick during the collision is:

J_brick = p3 - p2 = (m + M)V - 0 = (m + M)(mv0) / (m + M) = mv0

Therefore, the magnitude of the impulse acting on the brick is equal to the initial momentum of the bullet, mv0, and it is in the same direction as the initial velocity of the bullet.

In summary, during the collision of the bullet and the brick, the impulse acting on the bullet is zero, while the impulse acting on the brick is mv0 in the direction of the initial velocity of the bullet.

(b) We can use the principle of conservation of momentum to solve for the velocity of the brick-bullet combination just after the collision. The total momentum of the system (bullet, brick, and Earth) is conserved before and after the collision. Initially, only the bullet has momentum, which is given by p1 = m*v0, and the momentum of the brick and Earth is zero. After the collision, the bullet becomes embedded in the brick, and the combined system of the brick-bullet has momentum p2. Since the momentum of the Earth is negligible compared to that of the bullet and brick, we can treat the system as closed and apply conservation of momentum:

p1 = p2

m*v0 = (M + m)*v

where v is the velocity of the combined system just after the collision.

Solving for v, we get:

v = (m*v0) / (M + m)

Therefore, the magnitude of the velocity of the brick-bullet combination just after the collision is:

|v| = |(m*v0) / (M + m)|

The direction of the velocity is upward, as the system swings up after the collision due to the conservation of momentum.

(c) The initial kinetic energy of the system is the kinetic energy of the bullet just before the collision, which is given by:

KE1 = (1/2)mv0^2

The final kinetic energy of the system is the kinetic energy of the combined brick-bullet system just after the collision, which is given by:

KE2 = (1/2)*(M + m)*v^2

Substituting the expression we found for v:

KE2 = (1/2)(M + m)[(mv0) / (M + m)]^2

KE2 = (1/2)(m*v0^2) / (1 + M/m)

The ratio of the final kinetic energy to the initial kinetic energy is:

KE2 / KE1 = [(1/2)(mv0^2) / (1 + M/m)] / [(1/2)mv0^2]

KE2 / KE1 = 1 / (1 + M/m)

Therefore, the ratio of the final kinetic energy of the brick-bullet combination immediately after the collision to the initial kinetic energy of the brick-bullet combination is:

KE2 / KE1 = 1 / (1 + M/m)

(d)To determine the maximum vertical position reached by the brick-bullet combination, we can use conservation of energy, assuming there is no energy loss due to friction or other dissipative forces. At the maximum height, the kinetic energy of the system is zero, and all the initial kinetic energy has been converted to potential energy due to the height above the initial position.

The initial total energy of the system is the sum of the initial kinetic energy of the bullet and the gravitational potential energy of the brick:

E1 = (1/2)mv0^2 + Mgh1

where h1 is the initial height of the brick above the ground, and g is the acceleration due to gravity.

At the maximum height, the final total energy of the system is the potential energy due to the height above the ground:

E2 = (M + m)gh2

where h2 is the maximum height reached by the brick-bullet combination above the initial position.

Since there is no energy loss, we can set the initial energy equal to the final energy:

E1 = E2

Substituting the expressions for E1 and E2 and solving for h2, we get:

(M + m)gh2 = (1/2)mv0^2 + Mgh1

h2 = [(1/2)mv0^2 + Mgh1] / [(M + m)*g]

Simplifying, we get:

h2 = (1/2)v0^2 / g + h1(M/m) / (1 + M/m)

Therefore, the maximum vertical position above the initial position reached by the brick-bullet combination is:

h2 = (1/2)v0^2 / g + h1(M/m) / (1 + M/m)

Hope this helps :)

We will have the following:

So, the nergy is 2.3 J.

There are several lines of evidence that suggest the Milky Way contains dark matter. One of the most significant pieces of evidence is the observation of the galactic center, which reveals a massive black hole that is believed to be composed of dark matter.

In addition, observations in different wavelengths, such as infrared and radio, have revealed objects that are invisible in visible light, which is consistent with the presence of dark matter.
Another piece of evidence comes from the observation of dark voids between stars in the halo of the Milky Way. These voids cannot be explained by the presence of ordinary matter, suggesting that there must be some other source of mass, such as dark matter.
Furthermore, the observation of stars and gas clouds far from the galactic center reveals that they are orbiting the galaxy at higher speeds than would be expected based on the visible matter alone. This suggests that there is additional mass in the galaxy that we cannot see, which is consistent with the presence of dark matter.
Finally, the observation of dark lanes blocking out the light of stars behind them along the band of the Milky Way provides further evidence for the existence of dark matter. These lanes cannot be explained by the presence of ordinary matter, and their presence is consistent with the idea that there is a significant amount of dark matter in the Milky Way.

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Answer:

Preoperational

Explanation:

According to Piaget's theory of cognitive development, the preoperational stage is the second stage. This stage includes children between the age group of 2 to 7 years. Children can understand conservation tasks and learn to manipulate various symbols during this stage.

So, the answer is the preoperational stage.

Answer:

B Preoperational

Explanation:

This is the answer the person above is correct!

This is for edge 2021/2022

Hope this helps!!

Answer:

air is the answer your WC be safe

The correct option is C. Only for AC, use the zero crossing to our advantage.

Circuit breakers are devices used to interrupt current flow in case of faults or abnormal conditions in electrical circuits. They are designed to protect the electrical system and connected components from damage due to excessive current.

Option A is correct because circuit breakers are indeed used to interrupt current flow in case of a fault. They detect abnormal current levels and open the circuit to prevent damage.

Option B is correct as well because circuit breakers are designed to open automatically when the current exceeds predetermined values. This helps protect the circuit from overloading and potential hazards.

Option D is also correct because circuit breakers often operate through a solenoid mechanism that responds to a signal from an operator or an automated control system.

Option E is correct because one of the functions of circuit breakers is to isolate components or sections of a circuit. They can be used to disconnect specific parts of the circuit for maintenance or troubleshooting purposes.

Option C is the exception because circuit breakers are used for both AC (Alternating Current) and DC (Direct Current) circuits. They are not limited to AC circuits and do not rely on zero crossings for their operation.

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Answer:

1200cm^2

Explanation:

length of the box (L) = 40 cm

width of the box (W) = 30 cm

Area of the base is obtained as the area of the rectangle. Recall that the base of a box is a rectangular shape.

Therefore;

Area of base = 40cm * 30cm =1200cm^2

1864+7397=8199436 thats it

Answer:0.45s

Explanation:

Trust me