A school bus moves slower and slower. Using what you have learned about forces, explain why the bus moves slower and slower.

The velocity with which the observer is moving towards the tuning fork is 12.9 m/s.

The frequency of sound emitted by the tuning fork, f = 346 Hz

The apparent frequency of sound from the tuning fork, f' = 333 Hz

Velocity of sound at 20°C, v = 343 m/s

The frequency actually perceived is different from the frequency of the source when there is relative motion between the source of a sound or light wave and an observer along the line joining them. The term Doppler's Effect refers to this phenomenon.

According to Doppler's Effect,

f' = f [(v - v₀)/v]

f'v/f = v - v₀

Therefore, the velocity with which the observer is moving towards the tuning fork is,

v₀ = v - (f'v/f)

v₀ = v(1 - f'/f)

v₀ = 343 (1 - 333/346)

v₀ = 343 x 13/346

v₀ = 12.9 m/s

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Answer:thermal energy

Explanation:

please mark this answer as brainliest

Answer:

0.5m

Explanation:

v=f×lamda

v is 300m/s, f is 600Hz, lamda is ?

lamda=v/f

lamda=300/600

lamda =3/6=1/2m

Answer:

I = 50 A

Explanation:

The magnetic field created by a wire with a current can be calculated as:

Where μ is a constant equal to 4π x 10^(-7) T m/A, I is current, and r is the distance from the wire. So, replacing the values, we get:

Then, solving for I, we get:

Therefore, the current that is traveling through the wire is 50 A.

On the other hand, if the current is moving upward, the direction of the magnetic field can be found by the rule of the right hand, so the magnetic field will have the following direction:

P-waves are the first seismic waves to arrive and travel at the fastest speeds when compared to other seismic wave types like S-waves and surface waves

The Primary wave, or P-wave, is the fastest kind of seismic wave. The initial tremors experienced during an

are brought on by these waves. P-waves are exceptional in that they can pass through both solid and liquid substances. The astounding speeds that P-waves can reach are up to 14,000 metres per second, or 45,932 feet per second.

P-waves are the first seismic waves to arrive and travel at the fastest speeds when compared to other seismic wave types like S-waves and surface waves. Predicting the size and location of earthquakes requires a thorough understanding of P-wave behaviour.

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Where the rod contacts the ball, the negative charges remain on the surface.The negative charges from the plastic rod are transferred to the rubber ball when Harper touches it to a negatively charged object.

B They stay on the surface where the rod touches the ball

The surface where the rod hits the ball at the point of contact between the two items is where the negative charges are most likely to remain.

These charges won't equally disperse inside the rubber ball or on the bottom surface of the ball; they'll stay on the rubber ball's surface.

Static electricity is a stationary electric charge that is produced by rubbing together two dissimilar objects. A static electric charge is produced when an object with an excess of electrons and an object with a deficiency of electrons are brought together. As a result, the negatively charged particles present in the objects will be redistributed to establish equilibrium, resulting in an electric current.

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Answer:

true

Explanation:

because global helps local

When electrons are emitted from the cathode, they can have zero velocity, one velocity, or a range of velocities depending on the conditions under which they are emitted.

For example, in a vacuum tube, electrons are emitted from the cathode due to thermionic emission and they typically have a range of velocities.

However, in a photoelectric effect experiment, electrons are emitted from the cathode due to the absorption of photons and they typically have a well-defined velocity determined by the energy of the incident photons.

Similarly, in a field emission experiment, electrons are emitted from the cathode due to a high electric field and they typically have a high velocity.

Therefore, the velocity of the electrons emitted from the cathode depends on the mechanism of emission and the conditions under which they are emitted.

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Asteroids are made up of metals and rocky material, while comets are made up of ice, dust and rocky material. Both asteroids and comets were formed early in the history of the solar system about 4.5 billion years ago.

Answer:

0,146 L

Explanation:

Según la ley de Charles; el volumen de una determinada masa de gas es directamente proporcional a su temperatura a presión constante.

A partir de los datos proporcionados;

V1 = 0,2 L

T1 = 100 ° C + 273 = 373 K

V2 =

T2 = 0 ° C + 273 = 273 K

V1 / T1 = V2 / T2

V1T2 = V2T1

V2 = V1T2 / T1

V2 = 0,2 × 273/373

V2 = 0,146 L

The flow meter ball is designed to measure the rate of gas flow through a system. It is a simple mechanical device that relies on the buoyancy of the gas to float at a certain height in the flow tube. The position of the ball indicates the rate of flow of the gas.

However, the buoyancy of the gas is affected by a number of factors, including the type of gas being used, the temperature and pressure of the gas, and the presence of other gases or contaminants in the system. In the case of shielding gases, different gases have different densities and viscosities, which can affect the buoyancy of the flow meter ball.

In summary, while the shielding gases may be flowing at the same rate, the position of the flow meter ball can be affected by a number of factors, including the type of gas being used, the temperature and pressure of the gas, and the presence of other gases or contaminants in the system.

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a ) When they reach the ground, rock B has greater velocity.

b ) Both rocks have the same acceleration

c ) Rock A and Rock B arrives at the same time

According to law of conservation of energy,

1 / 2 m u² + m g hi = 1 / 2 m v² + m g hf

u = 0

hf = 0

m g hi = 1 / 2 m v²

v = √ ( 2 g / m ) √ hi

v ∝ √ hi

a ) hi of rock A will be higher because it reaches a certain height above the ground which will be considered as initial height for rock A. So, the final velocity of rock A is higher.

b ) Both the rock are affected by only the force of gravity. So they will have the same acceleration of 9.8 m / s²

c ) If air resistance is ignored,

s = u t + 1 / 2 at²

For an object that is dropped,

u = 0

a = g

s = at² / 2

t = √ ( 2 s / g )

It can clearly be seen that no matter what height an object might be dropped from, if air resistance is ignore they will fall at the same time.

Therefore,

a ) When they reach the ground, rock B has greater velocity.

b ) Both rocks have the same acceleration

c ) Rock A and Rock B arrives at the same time

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Answer:

These deep-ocean currents are driven by differences in the water's density, which is controlled by temperature (thermo) and salinity (haline). This process is known as thermohaline circulation.

Explanation:

The answers is 30 miles per hour, the driver is speeding the car up,     section-H, 12 minutes, section-D, and 65 miles per hour.

Answer:

Pressure means physical force that is another person or object.

No, the addition of a parallel capacitor does not necessarily decrease both the electric field and voltage. The electric field and voltage depend on the specific configuration of the circuit and the characteristics of the components involved.

When you add a capacitor in parallel to an existing circuit, it introduces an additional path for current to flow. The capacitor stores electric charge and can affect the distribution of voltage and electric field in the circuit. The effect on voltage and electric field depends on the relative capacitance of the added capacitor and the other components in the circuit. In some cases, adding a capacitor in parallel can cause a decrease in voltage across the capacitor itself. This is because the capacitor can initially act as a short circuit, allowing current to flow through it and reducing the voltage across it. However, the voltage across the other components in the circuit may not necessarily decrease. Regarding the electric field, the electric field is primarily determined by the voltage difference across a component and the physical arrangement of the circuit. Adding a parallel capacitor may affect the electric field locally around the capacitor, but it does not necessarily cause a decrease in the overall electric field throughout the entire circuit.

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Fusion reactions are reactions that occur when two or more atomic nuclei come close enough to form one or more different atomic nuclei and subatomic particles like protons and neutrons.

These reactions are important for a variety of reasons, including the energy they provide in the form of sunlight, the helium that forms during these reactions which is used in balloons, and the potential for fusion to provide a sustainable source of energy.

In stars, fusion reactions could not occur without the pressure created by the inward force of gravity. Fusion requires high temperatures and pressures to overcome the electromagnetic repulsion between positively charged atomic nuclei. In the core of a star, the high temperature and pressure created by gravity causes hydrogen nuclei (protons) to come together and form helium through a series of nuclear reactions known as the proton-proton chain.

This process releases a tremendous amount of energy in the form of light and heat, which provides the energy that stars need to shine and support life on planets like Earth.

Fusion reactions are incredibly important to our understanding of the universe and our ability to harness energy from sources that do not contribute to climate change.

While scientists have made great strides in developing fusion reactors that can produce energy on Earth, there is still much work to be done before we can fully realize the potential of this technology.

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Answer:

A. 0.5m/s².

B. –0.5m/s².

C. –0.5m/s².

D. 100m.

Explanation:

A. Determination of the acceleration in the first 20s.

Initial velocity (u) = 0

Final Velocity (v) = 10m/s

Time (t) = 20secs.

Acceleration (a) =..?

Acceleration = change in Velocity /time

a = (v – u)/t

a = (10 – 0)/20 = 10/20

a = 0.5m/s²

Therefore, the acceleration of the cyclist in the first 20secs is 0.5m/s²

B. Determination of the acceleration between 20 and 30s. This can be obtained as follow:

Initial velocity (u) = 10m/s

Final Velocity (v) = 5m/s

Time (t) = 30 – 20 = 10s

Acceleration (a) =..?

Acceleration = change in Velocity /time

a = (v – u)/t

a = (5 – 10)/10 = –5/10

a = –0.5m/s²

Therefore, the acceleration of the cyclist between the 20 and 30secs is

–0.5m/s².

C. Determination of the acceleration in the last 10s.

Initial velocity (u) = 5m/s

Final Velocity (v) = 0

Time (t) = 10s

Acceleration (a) =..?

Acceleration = change in Velocity /time

a = (v – u)/t

a = (0 – 5)/10 = –5/10

a = –0.5m/s²

Therefore, the acceleration of the cyclist between the last 10secs is

–0.5m/s².

D. Determination of the distance travelled by the cyclist when he was moving at a constant speed.

Velocity (v) = 5m/s

Time (t) = 50 – 30 = 20secs

Displacement (d) =?

Velocity = Displacement /Time

v = d/t

5 = d/20

Cross multiply

d = 5 x 20

d = 100m

Therefore, the distance travelled by the cyclist at constant speed is 100m

Answer:

54 W

Explanation:

Power = Voltage* Current =V*I = 120V*0.45A =54 Watt

A block of aluminum has a volume of 15.0 ml and a mass of 50.5 g. the density is: 3.36 g/ml

To solve this problem the density formula and the procedure that we have to use is:

d = m/v

Where:

Information about the problem:

Applying the density formula we get:

d = m/v

d = 50.5 g/15.0 ml

d= 3.36 g/ml

It is a physical quantity that expresses the ratio of the body mass to the volume it occupies.

What is volume?

It is the space occupied by a body, it is calculated by multiplying its dimensions, for example: length, height and width.

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1 - Incident ray

2 - Refracted ray

3 - Angle of incidence

4 - Angle of refraction

Refraction is the bending of light as it passes through a medium of a different refractive index. When light travels from one medium (such as air) to another (such as water or glass), its speed changes, and this causes the light to bend or change direction.

The amount of bending that occurs depends on the angle at which the light hits the interface between the two media, as well as the difference in refractive index between the two media. If the angle of incidence is large enough, the light may be totally reflected back into the original medium, in a phenomenon called total internal reflection.

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Depends on the capacity of the battery. Mainly the flashlight on our phones can be used for up to 8 to 10hrs continuously

The capacity of the battery is the level to which the battery is charged, & the amount of current drawn by the flashlight, you can calculate the answer yourself if you know the capacity of that light.

Moreover, you can calculate this by using the equation,

         E =Pt

So, for time

      t=E/P

Batteries are rated in Amp-hours, like 10 amp hours will supply us 1 amp for 10 hours

2 amps will give us 5 hours of light.

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To obtain a solution with a boiling point of 103.5 °C, a mass of ethylene glycol (C2H6O2) equal to [insert numerical value] grams must be added to 221.0 g of water.

To calculate the mass of ethylene glycol required, we need to use the equation for boiling point elevation. The boiling point elevation (ΔTb) is given by the formula ΔTb = Kbm, where Kb is the molal boiling point elevation constant and m is the molality of the solution. Rearranging the formula to solve for m, we have m = ΔTb / Kb.

We know that the boiling point elevation is 103.5 °C (the difference between the boiling point of the solution and the boiling point of pure water), and Kb for water is 0.512 °C/m. By substituting these values into the equation, we can calculate the molality.

Since molality (m) is defined as moles of solute per kilogram of solvent, we can convert grams of water to kilograms (kg) and calculate the molality (m).

Finally, by using the formula m = moles of solute / kilograms of solvent, we can determine the moles of ethylene glycol required. Using the molar mass of ethylene glycol (62.07 g/mol), we can convert moles to grams to obtain the mass of ethylene glycol needed.

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Answer:

A ball is thrown straight up with a speed of 30

m/s. What is the maximum height reached by

the ball?

Answer:

no the earth gravitational force field

Answer:

yes, it acts on everything within the earth

Explanation:

Answer:

-2.5 m/s²

Explanation:

The acceleration of a body is the change in it's velocity with time.

The change in velocity with time can be obtained as the slope of a velocity time graph ;

Acceleration = (change in velocity / change in time)

Taking the slope :

Change in Velocity = △y = y2 - y1

Change in time = △x = x2 - x1

(10, 15) ; (0, 40)

△y / △x = y2 - y1 / x2 - x1 = (40 - 15) / (0 - 10)

△y / △x = 25 / - 10 = - 2.5 m/s²

Given:

The mass on the table is,

The hanging mass is,

THe coefficient of friction is,

let the acceleration of the whole system is a (for the hanging mass it is downward and for the mass on the table it is rightward). the tension towards The fixed point of the pulley is T.

we can write,

Adding these equations we get,

Substituting the values we get,

Hence the acceleration is 6.66 m/s^2.