9. A cube has a mass of 40g, a volume of 8cm' and a length of 2. What
is the density?​

New observations support Hypothesis 1, as interactions between like and unlike charges follow expected attractive and repulsive behaviors.

Based on the observed interactions between like and unlike charged objects, it appears that the new observations do indeed add support to Hypothesis 1.

When like charges (similarly charged objects) come into proximity with one another, they exhibit repulsive behavior, causing them to move away from each other.

Conversely, when unlike charges (oppositely charged objects) come into contact, they display attractive behavior and move towards one another.

These observed phenomena align with our understanding of the behavior of charged objects and reinforce the validity of Hypothesis 1.

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The antenna is a tool to transmit and receive electromagnetic waves. It is shaped into a specific design to radiate electromagnetic energy. It has a null zone that represents an area in the radiation pattern.

The following is the complete response to the queries:

1. The function of an antenna is to transmit and receive electromagnetic waves.

2. Wire antennas are made of conductive wire that is shaped into a specific design to radiate electromagnetic energy. Aperture antennas use an opening in a conductive surface to radiate or receive electromagnetic waves.

3. Reflector antennas use a curved surface to reflect electromagnetic waves toward the direction of interest.

4. The main purpose of array antennas is to increase the directivity and gain of an antenna system by combining multiple antennas.

5. Side lobes are the undesirable radiation patterns that occur on the sides of the main lobe in an antenna's radiation pattern.

6. The null zone represents an area in the radiation pattern where the radiation intensity is at its minimum.

7. The stray factor is a measure of how much of the energy radiated by an antenna is lost due to factors like impedance mismatch or other inefficiencies. Beam efficiency is a measure of how much of the energy radiated by an antenna is directed toward the main lobe.

8. Gain is a measure of how much an antenna amplifies the incoming signal compared to a reference antenna. Directivity is a measure of how well an antenna concentrates the radiated energy in a particular direction.

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D&C Are the answers sorry if it's too short.

B: q magnet or a magnetic field

If two separate containers A and B have the same volume and temperature, but container A has more gaseous molecules than B, then the container A will have higher pressure than container B.

According to the approximations of ideal gas conditions, the pressure of a gas is directly proportional to the number of molecules of a gas at constant temperature and volume.

Having this in mind, at constant temperature and volume, container A has more gaseous molecules than B, then container A will have higher pressure than container B.

Below is the calculation for proof that shows which container has the higher pressure while keeping the volume and temperature the same.

So, V a = V b

n a* T a/ P a = n b* T b/ P b

Here, T a = T b

P a = n a/n b * P b

n a/n b > 1

P a/ P b > 1

P a > P b

Thus, the container A will have higher pressure than container B.

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The 80-kg person must sit 3.0 m from the fulcrum to balance the see-saw.

An 80-kg person must sit from the fulcrum to balance the see-saw with a 120-kg person sitting 2.0 m away, you can use the principle of moments.

When the see-saw is balanced, the clockwise moment equals the counterclockwise moment.

Calculate the moment for the 120-kg person.
Moment = mass x distance
Moment_120kg = 120 kg x 2.0 m = 240 kg*m

Calculate the required moment for the 80-kg person.
Since the see-saw is balanced, the moment for the 80-kg person must also be 240 kg*m.

Find the distance for the 80-kg person from the fulcrum.
Moment_80kg = mass x distance
240 kg*m = 80 kg x distance
distance = 240 kg*m / 80 kg = 3.0 m

The 80-kg person must sit 3.0 m from the fulcrum to balance the see-saw.

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Answer:

Resistencia = 12.5 Ohmios

Explanation:

Dados los siguientes parámetros;

Voltaje = 3.5 Volts

Corriente = 0.28 Amps

Para encontrar el resistencia;

La ley de Ohm establece que a temperatura constante, la corriente que fluye en un circuito eléctrico es directamente proporcional al voltaje aplicado en los dos puntos e inversamente proporcional a la resistencia en el circuito eléctrico.

Matemáticamente, La ley de Ohm viene dada por la fórmula;

Voltaje = corriente * resistencia

Resistencia = voltaje/corriente

Resistencia = 3.5/0.28

Resistencia = 12.5 Ohmios

Por tanto, la resistencia del filamento de una linterna de bolsillo es de 12,5 ohmios.

Answer:

Average speed = 60km/hr

Explanation:

Given the following data;

Time = 2.5 hrs

Distance = 150km

To find the average speed;

Average speed = distance/time

Substituting into the equation, we have

Average speed = 150/2.5

Average speed = 60km/hr

When a ferromagnetic material is placed in an electromagnetic coil and a magnetic field is applied, the magnetic induction (B) is increased.

Therefore, the correct answer is:

(a) There is a large increase in the magnetic induction (B)

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A heat engine with a total heat input of 1.3 kJ and a thermal efficiency of 51 percent will produce 0.663 kJ of work.

To find out how much work a heat engine will produce with a total heat input of 1.3 kJ and a thermal efficiency of 51 percent, follow these steps:

1. Convert the thermal efficiency percentage to a decimal by dividing it by 100. In this case, 51 / 100 = 0.51.
2. Multiply the total heat input by the thermal efficiency. In this case, 1.3 kJ × 0.51 = 0.663 kJ.

So, the answer is 0.663 kJ.

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Answer:

Explanation:

The acceleration of an object given it's velocity and time taken can be found by using the formula

\(a = \frac{v}{t} \\ \)

where

v is the velocity

t is the time

From the question

v = 450 m/s

t = 15 s

We have

\(a = \frac{450}{15} \\ \)

We have the final answer as

Hope this helps you

(a) A = B × r is a vector potential for B, where r = {x, y, 0}.

(b) The flux through a surface S can be calculated as Φ = ∫B·dA, where B is the magnetic field and dA is an infinitesimal area vector perpendicular to the surface.

(a) To verify that A = B × r is a vector potential for B, we need to show that ∇ × A = B.

Using the cross product property, we have ∇ × A = ∇ × (B × r). Applying the vector identity (A × B) × C = B(A · C) - C(A · B), we get ∇ × (B × r) = B(∇ · r) - r(∇ · B).

Since ∇ · r = 0 (as r = {x, y, 0}), and ∇ · B = 0 (as B has a constant magnitude in the z-direction), we find that ∇ × A = B, verifying A = B × r as the vector potential for B.

(b) The flux through a surface S can be calculated as Φ = ∫B·dA, where B is the magnetic field and dA is an infinitesimal area vector perpendicular to the surface.

Given that B has a constant strength b teslas in the z-direction, the flux through surface S will be Φ = ∫B·dA = ∫(0, 0, b) · (dxdy) = b∫dxdy = bA, where A is the area of the surface S.

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Answer:

d

Explanation:

Answer:

the answer for this is Letter B

Answer:

The basketball player jumped 10 m high.

Explanation:

Vertical Launch Upwards

In a vertical launch upwards, an object is launched vertically up without taking into consideration any kind of friction with the air.

If vo is the initial speed and g is the acceleration of gravity, the maximum height reached by the object is given by:

\(\displaystyle h_m=\frac{v_o^2}{2g}\)

The basketball player jumps up with a speed of vo=14 m/s. The maximum height is:

\(\displaystyle h_m=\frac{14^2}{2*9.8}\)

\(\displaystyle h_m=\frac{196}{19.6}=10\)

The basketball player jumped 10 m high.

Answer:

Electrolysis is the passing of a direct electric current through an ionic substance that is either molten or dissolved in a suitable solvent, producing chemical reactions at the electrodes and decomposition of the materials.

:

Answer:Electrolysis, process by which electric current is passed through a substance to effect a chemical change. ... The process is carried out in an electrolytic cell, an apparatus consisting of positive and negative electrodes held apart and dipped into a solution containing positively and negatively charged ions.

Explanation:

Answer:They are equal and act in opposite directions.

Explanation:Newton's third law of motion states that for every action there is an equal and opposite reaction. In the case of Bode's rocket, the pressurized air in the bottle forces the water to gush downward out of the bottle, causing the rocket to launch upward into the air. The force of the water gushing downward is equal to the upward force on the rocket. So, the two forces are equal and act in opposite directions.

The force that causes the water to leave the rocket compared to the force that causes the force to launch is equal but opposite in direction.

There is a threes law given by the scientist newton in relation to the motion. The first law tells that if a body is in stop mode, then they become in motion once an external force is applied to them. The second law tells that force is equal to the product of mass and acceleration of the body. The third law tells that if you apply force to an object, then the object also applies force in reaction.

According to Newton's third law, the rocket applies force to the water, then the water also exerts a force on the rocket.

In the instance of Bode's rocket, the bottle's pressured air causes the water to pour out of the bottle downward, which causes the rocket to shoot upward into the air. The upward force on the rocket is equivalent to the force of the water pouring down. Therefore, the two forces are equivalent and exert opposing forces.

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To determine the output voltage amplitude when the input signal is "v," we need to consider the amplification factor of the system. The amplification factor, commonly represented as "A," multiplies the input voltage to produce the output voltage. So, the output voltage amplitude (Vout) can be calculated using the formula:

Vout = A * v

Here, "v" represents the input signal, and "A" is the amplification factor. The output voltage amplitude depends on the specific system or circuit you are working with.

To find the value of "A," you will need to refer to the specifications or characteristics of that particular system. Once you have the amplification factor, you can use the formula above to calculate the output voltage amplitude.

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Answer:

The entity that decreases is the Weight.

Explanation:

Every object on the surface of the earth is usually pulled downwards by the action of gravity. The force or weight is W = mg

Now, the farther one gets away from the surface of the earth by climbing a mountain, the further the person is from the Earth's centre of gravity.

We know that the formula for Force of gravity away from the Earth's surface is given by;

F_g = GM1M2/r²

So the greater the distance, the lesser the gravitational force.

Now, the gravitational force equals the weight of the individual.

Thus, the entity that decreases is the Weight of the individual.

Answer:

Two objects that are the same volume will displace the same amount of water even if they have different masses.

Answer:

yes

Explanation:

because the planet exerts a centripetal force on the meteorold

No, the planet doesn't exert a torque on the meteoroid with respect to the center of mass of the planet.

This is defined as a form of twisting force which is responsible for rotation of objects.

The planet doesn't exert a torque on the meteoroid with respect to the center of mass of the planet because it exerts a force on the meteoroid parallel to its position vector relative to the center of mass of the planet.

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The correct option is (b) swot analysis.

The dimensions used in the general electric model are analogous to elements used in swot analysis.

What is general electric SWOT analysis?

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The correct answer is: "d) speed, displacement". Speed and displacement are merely scalar. Speed is magnitude without direction, a scalar quantity. Displacement is a scalar quantity that only measures an object's position change.

The only scalar option is "d) speed, displacement." Scalar quantities can be described solely by their magnitude or numerical value. They have no vectors. Speed is a scalar quantity since it measures distance covered. It measures speed without direction.

Displacement means moving an object in a certain direction. Displacement is a scalar quantity if just the magnitude of the position shift is considered. Velocity is a vector quantity because it comprises magnitude (speed) and direction. It shows how fast an object changes direction. Momentum, the product of mass and velocity, is a vector quantity. Direction and magnitude. Therefore only "d) speed, displacement" is scalar since it includes speed (scalar) and disregards direction for displacement.

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Answer:

9.3e-8 Meters

The term energy density tells us that the difference between the particle model and the energy interaction model lies in how the energy is distributed or spread out within a system.What is Energy Density?The amount of energy per unit volume that a substance or system contains is known as energy density.

Energy density is a measure of how much energy is stored in a given volume or mass of a substance or system. It is a vital physical property that affects how a system behaves and how much energy can be extracted from it.Particle Model Vs. Energy Interaction Model The particle model of matter refers to the view of matter as being composed of tiny, indivisible particles that are in constant motion and have kinetic energy. In this model, the behavior of matter is primarily determined by the interactions between these particles.The energy interaction model, on the other hand, views matter as being composed of different forms of energy that can be transferred or transformed from one form to another.

In this model, the behavior of matter is primarily determined by the interactions between different forms of energy.The primary difference between these two models lies in how they distribute or spread out energy within a system. In the particle model, energy is primarily distributed among the particles, while in the energy interaction model, energy is primarily distributed among the different forms of energy that are present in the system. This difference in energy distribution can have significant implications for how a system behaves and how much energy can be extracted from it.

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Answer:

C)  Total displacement = 1275 m or 1.275 km

Explanation:

We'll break this into two parts:  

1) Displacement during constant speed, and

2) Displacement during the acceleration phase.

Constant Speed

The displacement for this segment is already stated:  1 km.  But the information includes the time, which will allow us to calculate the speed of travel.  We'll need this for the next phase of acceleration.

Distance = Speed x Time

Speed = Distance/Time

Time = 1 minute + 20 sec, or 80 sec.

Speed = 1 km/80 sec

Speed = 0.0125 km/sec

Since we'll be using meters (not km) in the next step, convert 0.0125 km/sec to m/sec with a conversion factor:  

  (0.0125 km/sec)*(1000m/1 km) = 12.5 m/sec

Acceleration Phase

The obect is moving at a speed of 12.5 m/sec (from above) and then accelerates at a rate of 0.125 m/sec^2 for 20 seconds.

The distance (s) an object travels during this acceleration (a) is gven by:

  s = vi*t + (1/2)a*t^2,

where vi is the initial velocity (12.5 m/sec in this case), a is the acceleration (0.125 m/sec^2), and t is the time (20 seconds).

s = (12.5 m/sec)(20 sec) + (1/2)(0.125 m/sec^2)*(20 sec)^2

s = 275 meters

Now add the two distances:

1) Constant Speed Phase = 1000 m

2)  Acceleration Phase    =  275 m

Total displacement = 1275 m or 1.275 km

The length of the rubber band that the boy must use is 0.024 m or 24 mm.

To determine the length of the rubber band, we can use the formula for the potential energy stored in a stretched spring, which is also applicable to a stretched rubber band:

where U is the potential energy stored in the rubber band, k is the spring constant (or in this case, the rubber band constant), and x is the displacement of the rubber band from its natural length.

Since the rubber band is stretched by 0.25 of its natural length, the displacement x is 0.25 times the natural length of the rubber band.

We can solve for the rubber band constant k by using the formula for the velocity of a projectile launched by a spring (or in this case, a rubber band):

where v is the velocity of the projectile, m is the mass of the rubber band, M is the mass of the projectile, and k is the spring constant. We can rearrange this equation to solve for k:

k = (v² M) / (2 m)

We can now combine the two equations to solve for the length of the rubber band, L:

U = 1/2 k x²

U = 1/2 ((v² M) / (2 m)) (0.25 L)²

U = (v² M L²) / (32 m)

The potential energy stored in the rubber band must be equal to the kinetic energy of the projectile when it is launched:

U = 1/2 M v²

(v² M L²) / (32 m) = 1/2 M v²

L = ((16 m v²) / (k M))

L = ((16 m v²) / ((v² M) / (2 m) M))

L = √(32 m^2 / M)

L = (0.032 M)

Substituting the given values, we get:

L = √(0.032 * 0.006)

L = 0.024 m

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Answer: A I just got it wrong because of the other person.

Explanation:

The electromagnetic waves are those waves that move through space and carry electromagnetic radiant energy.  They include radio waves and microwaves. and many more.  

Hence the option A is correct.

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