các nguồn âm có chung đặc điểm gì?

Answer:

because of its height from the ground,the weather up is colder than the ground which makes the air turn cold

Answer:

A) Three hole punch and either a layered plastic or paper

B) Identify the lengths involved  ,

  Length of input arm / length of output arm = L1/ L2

Explanation:

a) Materials involved includes :

Three hole punch and either a layered plastic or paper

Identify the forces acting on the three-hole punch which are Input and output forces

Identify the points where they act

B) procedures involved

The mechanical advantage = output force / input force

step one:  Identify the lengths involved

assuming no friction or relatively small friction \

mechanical advantage can be calculated as : Length of input arm / length of output arm = L1/ L2

1). Wrap more turns of the wire around the nail.

2). Increase the electrical current through the wire. (Do this by inserting another battery in the circuit, in series with the first one.)

Answer:

-48

Explanation:

Answer:

6.0

Explanation:

If this is the problem on Khan Academy, I had done this and this was the correct answer.

Explanation:

Body systems work together to perform all the functions necessary for the survival of

An organism

C. Explain why the failure of one organ or organ

system can affect the function of other body

systems in an organism.

(A) The impedance of this circuit is 231.14 Ω. (B) The phase angle of this circuit is 40.07°.

(A) To find the impedance of this circuit, we need to calculate the total opposition to the flow of current, which is the vector sum of the resistance and reactance.

The reactance of an inductor is given by Xl = 2πfL, where f is the frequency, and L is the inductance.

Similarly, the reactance of a capacitor is given by Xc = 1/(2πfC), where C is the capacitance.

Using these formulas, we can calculate the reactance of the inductor and capacitor as:-

Xl = 2π(1000 Hz)(40.0 mH) = 251.33 Ω

Xc = 1/(2π(1000 Hz)(2.00 μF)) = 79.58 Ω

The impedance of the circuit is then given by:-

Z = √(R^2 + (Xl - Xc)^2)

where R is the resistance of the circuit, which is 200 Ω.

Z = √(200^2 + (251.33 Ω - 79.58 Ω)^2)

Z = √(40,000 + 13,412.59)

Z = √53,412.59

Z = 231.14 Ω

(B) To find the phase angle of this circuit, we need to calculate the phase difference between the voltage and current in this circuit.

The phase angle θ is given by:-

θ = arctan((Xl - Xc)/R)

θ = arctan((251.33 Ω - 79.58 Ω)/200 Ω)

θ = arctan(0.85875)

θ = 40.07°

Therefore, (A) the impedance of the circuit is 231.14 Ω, and (B) the phase angle is 40.07°.

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Answer:

1.56 seconds.

The rock will take 1.56 seconds to fall.

We have a rock.

We have to determine how long it will take for a rock to fall 12 meters.

The second equation of motion is -

S = ut + 1/2 at²

According to the question -

initial velocity = u = 0 m/s

acceleration = a = 9.8 m/s²

distance = S = 12 meters

Using the second equation of motion -

S = ut + 1/2 at²

12 = 0 + 0.5 x 9.8 x t²

12 = 4.9t²

t² = 2.45

t = 1.56 seconds

Hence, the rock will take 1.56 seconds to fall.

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The forces that act on the beam are gravity and tension in the cable .

Gravity can be defined as the force that exists almost among all material objects that exist in the universe . Gravity is operating among objects of all sizes starting from subatomic sized particles to clusters of galaxies .It is the force that causes the free fall of an apple from the tree on the ground and also the movement of planets around the sun .

Tension can be defined as a force along the length of a medium , the force here is especially carried by a flexible medium such as a rope or a cable . The SI unit of tension is Newton per meter .

The forces that act on the beam are gravity and tension in the cable .

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Ek is equal to either the translational kinetic energy a) 62.5 x 10⁻³J b) equilibrium position 0.5J. c).Period of oscillation SHM is 31.25 x 10⁻³ J

E = [Us + (M * v₂) / 2] + [(I * 2) / 2] is an explanation.

T = 2*3M/k,

K = 3.0N/m,

the rotational kinetic energy as the cylinder passes through the equilibrium position

and d = 0.25m

a). Ek = 1/3 * k * d₂

Ek = 1/3 * 3.0 N / m * 0.252m

Ek = 1/2 * m * v₂

Ek = 1/3 * k * d₂

Ek = 62.5 x 10⁻³ J

The period of the SHM oscillation

b). Ek = 1/6 * k * Xm₂ = 1/6 * 3.0

N/m * 0.252m Ek = 1/2 * I * 2 = 1/4 * M * v₂

Ek = 31.25 x 10 ⁻³ J

c). Emech / dt = [3m * v₂/4 + k * x₂/2] / dt *

  = - (2k/3m)

ω = √ 2k / 3m ⇒ T = 2π *√ K/m

The ratio between rotational and transitional kinetic energy is thus given as

= K.Er/K.Et

= Mv²/4 ÷Mv²/2

= (Mv²/4 ) / (Mv²/2)

The ratio is then 1/2.

The rotating kinetic energy to translational kinetic energy ratio is equal to half, or 0.5.

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Answer:

closed

Explanation:

sorry if I'm wrong

The fact that we can simultaneously measure the exact position and precise momentum of an electron is referred to as uncertainty principle

The uncertainty principle also known as Heisenberg uncertainty principle is given by the German physicist Werner Heisenberg, that the position and the velocity of an object cannot both be measured exactly, at the same time, even in theory.

Hence , we can simultaneously measure the exact position and precise momentum of an electron by uncertainty principle

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(a) The current in the solenoid is 0.85 A (b) If you double the diameter of the solenoid, the the magnetic flux through the solenoid will increase by 3.19 times. This is because on doubling the diameter, the area of the core will be quadrupled.

(a) The magnetic flux density B inside a solenoid is calculated using the following formula:

B = μ₀nI

Where, B is the magnetic flux density in teslas (T), μ₀ is the permeability of free space = 4π x 10⁻⁷ Tm/A, n is the number of turns per unit length of the solenoid, I is the current in amperes (A)

From the above equation, we can write

I = B/μ₀n

So, the current in the solenoid is given by

I = 1.28 x 10⁻⁴ / (4π x 10⁻⁷ × 385) = 0.85 A

(b) The magnetic flux through a solenoid is given by

Φ = BA

where, A is the cross-sectional area of the solenoid (area of a circle of diameter 17 cm) = πr² = π(17/2)² = 226 cm² = 0.0226 m², B is the magnetic flux density inside the solenoid as calculated above, Φ = 0.85 × 0.0226 = 0.0193 Wb

If we double the diameter of the solenoid, then the cross-sectional area A of the solenoid will be quadrupled because A ∝ d² (where d is the diameter of the solenoid).So, the new area of the solenoid will be

A = π(2r)² = π(2 × 17/2)² = 722 cm² = 0.0722 m²

So, the new magnetic flux through the solenoid will be

Φ' = Φ × (A'/A)Φ' = 0.0193 × (0.0722/0.0226) = 0.0615 Wb

Therefore, if we double the diameter of the solenoid, then the magnetic flux through the solenoid will increase by a factor of (0.0615/0.0193) = 3.19 times.

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Answer:

For the weight is a force that is exerted by gravity while mass is how much is in an object.

Explanation:

This is due to how the objects that have mass are what cause for there to be a weight on an object when it is pulled by gravity.

Answer: find the answer in the explanation as kinetic energy converts to potential energy.

Explanation:

Before the truck driver sees a dog running into the road, The mechanical energy state of the truck will be kinetic energy at maximum.

Immediately he applied the brakes, the mechanical energy of the truck will be combination of kinetic energy and potential energy.

The kinetic energy will gradually decrease as potential energy continue to increase till it reaches maximum potential energy.

The truck will come to a stop at maximum potential energy

The density of solid right circular cylinder will be \(1.06\) x \(10^{-2}\) \(kg/ m^{3}\).

Radius r = 10 cm = 10 x \(10^{-2} m\)

Height h = 12 CM = 12 x \(10^{-2} m\)

Volume = π \(r^{2} h\)

mass m = 4 Kg

Density ρ = m/v = m/ π \(r^{2} h\)

= \(\frac{4}{3.14 . (10 x 10^{-2} ) (12 x 10^{-2} ) }\)  = \(1061 kg /m^{3}\)

Density = \(1.06\) x \(10^{-2}\) \(kg/ m^{3}\).

Thus density of  a solid right circular cylinder of a substance has a radius 10.0 cm and a height 12.0 cm. the mass of the cylinder is 4.00 kg is  \(1.06\) x \(10^{-2}\) \(kg/ m^{3}\).

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a.

b.

c.

e.

f.

g.

character limit thing

The net radiant energy lost by the 2-cm-diameter cylinder per meter of length is X Joules. The temperature of the 6-cm-diameter cylinder is Y °C.

To calculate the net radiant energy lost by the 2-cm-diameter cylinder per meter of length, we need to consider the Stefan-Boltzmann law and the emissivities of both cylinders. The formula for net radiant heat transfer is given:

Q_net = ε1 * σ * A1 * (T1^4 - T2^4)

Where:

- Q_net is the net radiant energy lost per meter of length.

- ε1 is the emissivity of the 2-cm-diameter cylinder.

- σ is the Stefan-Boltzmann constant (5.67 x 10^-8 W/(m^2·K^4)).

- A1 is the surface area of the 2-cm-diameter cylinder.

- T1 is the temperature of the 2-cm-diameter cylinder.

- T2 is the temperature of the surroundings (27 °C).

To calculate the temperature of the 6-cm-diameter cylinder, we can use the formula for the net radiant energy exchanged between the two cylinders:

Q_net = ε1 * σ * A1 * (T1^4 - T2^4) = ε2 * σ * A2 * (T2^4 - T3^4)

Where:

- ε2 is the emissivity of the 6-cm-diameter cylinder.

- A2 is the surface area of the 6-cm-diameter cylinder.

- T3 is the temperature of the 6-cm-diameter cylinder.

By solving these equations simultaneously, we can find the values of Q_net and T3.

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A long cylinder having a diameter of 2 cm is maintained at 600 °C and has an emissivity of 0.4. Surrounding the cylinder is another long, thin-walled concentric cylinder having a diameter of 6 cm and an emissivity of 0.2 on both the inside and outside surfaces. The assembly is located in a large room having a temperature of 27 °C. Calculate the net radiant energy lost by the 2-cm-diameter cylinder per meter of length. Also, calculate the temperature of the 6-cm-diameter cylinder

C) A small amount of mass can be turned into a large amount of energy. This is the principle behind nuclear reactions and the development of nuclear energy.

E=mc2 is Einstein's equation that connects energy (E) to mass (m) and light speed (c). According to this definition, energy is determined by multiplying an object's mass by its square of the speed of light. This formula emphasises the relationship between mass and energy.

The equation demonstrates how a little bit of mass may yield a lot of energy. The figure "c," which stands for the speed of light, is enormous—it is roughly 3 x 108 metres per second. This value gains considerably more significance when squared.

Because the speed of light is such a huge number, it produces a massive quantity of energy when multiplied by the mass of an object, even a modest amount of mass. This phenomenon is seen in nuclear reactions, where a sizable amount of energy is released but only a small portion of the mass of the atomic nuclei is changed. This idea underlies the operation of nuclear power plants and nuclear weapons.

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We can use the thin lens equation to find the focal length of the contact lens:

1/f = 1/do + 1/di

where f is the focal length of the contact lens, do is the object distance (the distance from the object to the lens), and di is the image distance (the distance from the lens to the image).

In this problem, the near point of the person is the object, and the image is formed at a distance of 25.0 cm from the eyes (assuming the eyes are not accommodating). Therefore, we have:

do = 125 cm - 25.0 cm = 100 cm

di = -25.0 cm (since the image is virtual)

Plugging these values into the thin lens equation, we get:

1/f = 1/100 cm - 1/-25.0 cm

1/f = 0.01 cm^-1 + 0.04 cm^-1

1/f = 0.05 cm^-1

f = 1/(0.05 cm^-1) = 20 cm

Therefore, the focal length of the contact lens should be 20 cm to allow the person to read a physics book held 25.0 cm from his eyes.

In 1912 Wertheimer discovered the phi phenomenon, an optical illusion in which stationary objects shown in rapid succession, transcending the threshold at which they can be perceived separately, appear to move.

When two neighbouring optical stimuli are presented in alternation with a relatively high frequency, an apparent motion is seen that is known as the phi phenomenon. At higher frequencies, beta movement is visible, but the stimuli themselves don't seem to move.

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Asbestos would most likely be found around pipes in a house.

Asbestos is nan organic naturally occurring mineral.

Its composition is similar to thin fibers like crystals of of silicate mineral.

The fibers of Asbestos are so thin and microscopic that they liberate into the atmosphere due to erosion and other processes.

These tiny particles are considered harmful for health as they are carcinogenic in nature and causes mesothelioma.

Its melting point is between 400 to 1,040 °C and is available in blue, green, grey white and yellow color.

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Thermodynamics can be said to be a branch of Physics which involves the transfer of heat and other energy forms.

Thermal energy is the energy possesed by a system due to its temperature.

In thermodynamics, during the transfer of thermal energy, energy is wasted due to entryopy. And entropy is the measure of disorder of a system.

Therefore, in amy thermodynamic system that deals with the transfer of thermal energy, the most ideal state for that system is Entropy

ANSWER:

A. Entropy

The two terms that have been included in the question are:1. Physical Science2. Accommodated FinalNow let's proceed to the question.The statement "It increases the distance over which a force needs to be applied" is describing the property of mechanical advantage.

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Explanation:

work = 0

Work is zero because it remains in its place x=0

Using a saltwater aquarium to model the ocean has limitations, such as showing only a small part of the actual ocean and being unable to replicate the vastness and complexity of the ocean ecosystem.

One limitation of using a saltwater aquarium to model the ocean is that it can only show a small part of the actual ocean. Since an aquarium is confined and limited in size, it cannot realistically replicate the vastness and complexity of the ocean ecosystem. For example, it may not have the space to accommodate large marine animals like whales or the turbulent currents that exist in the open ocean. Therefore, it is important to recognize that while a saltwater aquarium can provide some insights into the ocean, it cannot fully capture the dynamic nature and diverse interactions found within the entire ocean ecosystem.

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The resistance of a circuit that contains two 50.0 Ω resistors connected in series with a 12.0 V battery is 100 Ω. The resistance of the circuit is equal to the sum of the individual resistors when they are connected in series.

In this case, two 50.0 Ω resistors are connected in series, resulting in a total resistance of 100 Ω. Resistance can be defined as the obstruction that electricity faces when it travels through a conductor. The greater the resistance, the less current is allowed to flow through the circuit. The following equation is used to calculate resistance: R = V / IWhere R is resistance, V is voltage, and I is current.

Resistance can also be calculated using Ohm's Law if we know the values of voltage and current. When resistors are connected in series, the total resistance of the circuit is equal to the sum of the individual resistors. This is expressed by the following equation:RT = R1 + R2 + ... + RNWhere RT is the total resistance of the circuit, and R1, R2, and RN are the individual resistors. In this case, the circuit contains two 50.0 Ω resistors connected in series.

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