A stone tumbles into a mine shaft and strikes bottom after falling 4. 2 seconds. How deep is the mine shaft?

Answer:

102°F fever in Celsius is equivalent to 38.9°C.

1. The duty charge, MPF and HMF for the Ultrasonic Vaporizer transported via air are USD$31.50, USD$2.60 and USD$0.94, respectively.

2. The duty charge, MPF and HMF for the Ultrasonic Vaporizer transported via ocean are USD$31.50, USD$0.94 and USD$0.94, respectively.

For the Ultrasonic Vaporizer transported via air

Duty Charge:

Given information;

Duty rate = 4.2%

Value of goods = USD$750

Duty charge = Value of goods x Duty rate

Duty charge = USD$750 x 4.2%

Duty charge = USD$31.50

Merchandise Processing Fee (MPF)

MPF rate = 0.3464% (as of 2021)

Value of goods = USD$750

MPF = Value of goods x MPF rate

MPF = USD$750 x 0.3464%

MPF = USD$2.60

Harbor Maintenance Fee (HMF)

HMF rate = 0.125% (as of 2021)

Value of goods = USD$750

HMF = Value of goods x HMF rate

HMF = USD$750 x 0.125%

HMF = USD$0.94

Therefore, the total import fees for the Ultrasonic Vaporizer transported via air are:

Duty charge = USD$31.50

MPF = USD$2.60

HMF = USD$0.94

For the Ultrasonic Vaporizer transported via ocean

Duty Charge:

Given information:

Duty rate = 4.2%

Value of goods = USD$750

Duty charge = Value of goods x Duty rate

Duty charge = USD$750 x 4.2%

Duty charge = USD$31.50

Merchandise Processing Fee (MPF)

MPF rate = 0.125% (as of 2021)

Value of goods = USD$750

MPF = Value of goods x MPF rate

MPF = USD$750 x 0.125%

MPF = USD$0.94

Harbor Maintenance Fee (HMF):

HMF rate = 0.125% (as of 2021)

Value of goods = USD$750

HMF = Value of goods x HMF rate

HMF = USD$750 x 0.125%

HMF = USD$0.94

Therefore, the total import fees for the Ultrasonic Vaporizer transported via ocean are:

Duty charge = USD$31.50

MPF = USD$0.94

HMF = USD$0.94

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Duty Charge=$31.50

The MPF will be $27.23.

The HMF rate is $0.125 per metric ton.

Ultrasonic Vaporizer transported via Air:

Duty Charge: $31.50

MPF: $26.79

HMF: Not applicable

Ultrasonic Vaporizer transported via Ocean:

Duty Charge: $31.50

MPF: $27.23

HMF: HMF rate and weight of the vaporizer are needed to calculate the HMF.

Ultrasonic Vaporizer transported via Air:

Duty Charge: The duty charge is calculated by multiplying the value of the product ($750) by the duty rate (4.2%): Duty Charge = \(\$750 * 4.2\%\)

= \(\$31.50.\)

MPF: The MPF for air transport is based on the value of the merchandise. As the value of $750 is below the maximum, the MPF will be $26.79.

HMF: The HMF is not applicable for air transport.

Ultrasonic Vaporizer transported via Ocean:

Duty Charge: The duty charge is calculated in the same way as for air transport: Duty Charge = \(\$750 * 4.2\%\)

= \(\$31.50\).

MPF: The MPF for ocean transport is also based on the value of the merchandise. As the value of $750 is below the maximum, the MPF will be $27.23.

HMF: The HMF is applicable for ocean transport. The HMF rate is $0.125 per metric ton. The weight of the Ultrasonic Vaporizer is needed to calculate the HMF.

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Answer: A radio wave is generated by a transmitter and then detected by a receiver. An antenna allows a radio transmitter to send energy into space and a receiver to pick up energy from space. Transmitters and receivers are typically designed to operate over a limited range of frequencies.

Explanation:

Answer:

0.05

Explanation:

Divide the mass of the solute by the total volume of the solution. Write out the equation C = m/V, where m is the mass of the solute and V is the total volume of the solution. Plug in the values you found for the mass and volume, and divide them to find the concentration of your solution.

When you rub your hands together, the energy transformation that occurs is mechanical energy to heat energy. Therefore, the correct option is A.

Mechanical energy to heat energy. Energy is the capacity to do work or move an object. There are several forms of energy, such as mechanical energy, electrical energy, chemical energy, and heat energy. When energy is transformed from one form to another, the law of conservation of energy states that the total amount of energy in the system remains constant.

Mechanical energy is the energy associated with an object's movement or position. Rubbing your hands together is a physical movement that requires energy to be used, and that energy is then transformed into heat energy, which causes your hands to warm up. Thus, when you rub your hands together, the energy transformation that occurs is from mechanical energy to heat energy.

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The significance of a source in research is crucial as it determines the reliability and validity of the information presented. A credible source is important because it ensures that the information presented is accurate and trustworthy.

Using sources that are not credible or reliable can lead to the spread of misinformation, which can have practical consequences such as wrong decisions and actions based on incorrect information. Theoretical consequences could include flawed research or faulty arguments. It is important to consider the limitations, objections, or weaknesses of a source, as these can undermine its significance. This includes evaluating factors such as bias, sample size, and methodology used in the research.

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--The complete Question is, Identify the significance of the source—why is it important?—what practical or theoretical consequences might follow from the main point?—what limitations, objections, or weaknesses might be present that could serve to undermine the significance of the source?--

If Two slits spaced 0.300 mm apart are placed 0.700 m from a screen and illuminated by coherent light with a wavelength of 620 nm then The distance on the screen from the center of the central maximum to the first minimum is 1.44 mm.

The double-slit experiment is a proof in contemporary physics that light and matter may exhibit properties of both conventionally defined waves and particles; moreover, it demonstrates the essentially probabilistic nature of quantum mechanical events. Thomas Young initially performed this sort of experiment in 1801, as a proof of visible light's wave behaviour.

In this problem,

Given,

slit spacing a = 0.3 mm = 0.3 × 10⁻³ m

screen distance D = 0.7 m

wavelength of the light λ = 620 nm = 620 × 10⁻⁹ m

By using formula,

x/D = λ/a

x = λD/a

putting all the values,

x =  620 × 10⁻⁹ × 0.7÷ 0.3 × 10⁻³

x  = 1.44 mm

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Answer:

Benjamin Franklin, Thomas Edison

and Robert Anderson, Thomas Davenport

Explanation:

Edison was Franklin's idol in studying electricity (Edison's electric light bulb, and Franklin's metal key string kite static experiment)

Anderson and Davenport for the first electric car

The momentum of the proton is approximately 1935.5 MeV/c.

To solve this problem, we can use the relativistic energy-momentum relationship for a particle:

\(E^2 = (pc)^2 + (mc^2)^2\),

where E is the total energy, p is the momentum, m is the rest mass, c is the speed of light.

Given:

\(E = 6mc^2\),

We can substitute this into the energy-momentum equation:

\((6mc^2)^2 = (pc)^2 + (mc^2)^2.\)

Expanding and rearranging the equation:

\(36m^2c^4 = p^2c^2 + m^2c^4,\)

\(35m^2c^4 = p^2c^2.\)

Dividing by \(c^2\):

\(35m^2c^2 = p^2\).

Taking the square root:

p = √(35\(m^2c^2\)).

Now, we need to convert the mass energy (m\(c^2\)) into MeV units. The rest mass of a proton is approximately 938.27 MeV/\(c^2\).

Substituting the values:

p = √(35 * (938.27 MeV/c²)² * (299,792,458 \(m/s)^2\)).

Simplifying:

p ≈ √(35 * (938.27 MeV)²) ≈ √(35) * 938.27 MeV ≈ 1935.5 MeV/c.

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An industrial load consumes 100 kw at 0.8 pf lagging. if an ammeter in the transmission line indicates that the load current is 200 a rms, the load voltage is 625 volts.

We are provided with information about an industrial load, specifically its power consumption, power factor, and current. Our goal is to determine the load voltage. First, we calculate the apparent power (S) using the formula S = P / PF, where P is the power and PF is the power factor. The power is given as 100 kW (kilowatts), and the power factor is stated as 0.8 (lagging). Dividing 100 kW by 0.8 gives us an apparent power of 125 kVA (kilovolt-amperes). Next, we utilize the relationship between apparent power, voltage, and current. The apparent power (S) is given by the formula S = V * I, where V represents voltage and I represents current. Rearranging the formula, we find V = S / I.

Plugging in the values we have, we substitute 125 kVA for S and 200 A (amperes) for I. Dividing 125 kVA by 200 A, we calculate the load voltage to be 625 V (volts). Therefore, based on the given power consumption of 100 kW at a power factor of 0.8 lagging and an ammeter reading of 200 A rms, we conclude that the load voltage is 625 volts.

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Answer:

accurate it means trying to find accurate or exact value. or tends to find exact value,

Explanation:

Answer:

hi

Here are the answers you need

a. Romi's speed = slope of graph = 1000/15 - 0 = 66m/min

b. for 10 minute

c. I do not know the answer for this question, please forgive me

d.at 1000m from home they meet

I hope this helps you.

May god bless you and if you like this answer and think it helped you very much please mark me as brainliest because that will help me very much.

Answer:1200

Explanation:

F=ma =m(Vf-Vi)/t

F=120(25-5)/2 =1200N

Answer:

\(f = m \frac{v1 - v2}{t} \\ = 120 \times \frac{25 - 5}{2} \\ = 120 \times 10 \\ = 1200N \\ thank \: you\)

Answer:

a

Explanation:

the river over time will eroded the rock

Answer:

The small car and the truck experience the same average force.

Explanation:

Here we need to remember two of Newton's laws.

The second one says that:

F = m*a

force equals mass times acceleration.

And the third one says that;

"If an object A exerts a force on object B, then object B must exert a force of equal magnitude and opposite direction back on object A"

From the third law, if the car experiences a force F due to the impact with the truck, then the truck experiences the same force F due to the impact.

But this seems odd, because we would expect to see the car being more affected by the impact, right?

Well, this is explained by the second law.

Suppose that the mass of the car is m, and the mass of the truck is M.

such that M > m

Then for the small car we have:

F = m*a

And for the truck:

F = M*a'

Because the force is the same for both of them, we can write:

m*a = M*a'

a = (M/m)*a'

because M > m, then M/m > 1.

This means that the acceleration that the car experiences is larger than the acceleration for the truck, and this is why we would see that the car seems more affected by the impact, regardless of the fact that both vehicles experience the same force in the impact.

Inside the sphere, the total charge is 40a4/40.

Apply the formula Q=DdS, where D is the electric flux density inside the sphere and S is the sphere's surface area.

The electric flux density inside a dielectric sphere of radius a centered at the origin is represented as D=R0R (C/m2).

Substitute D for Q in the formula and integrate across the sphere's surface area.

A sphere's surface area is 4r2.

Integrate over r from 0 to a, 0 to and 0 to 2.

Simplify the integral to get Q=4a4/40.

When matter is placed in an electromagnetic field, its electric charge causes it to experience a force. Electric charge can be positive or negative (often carried by protons and electrons). Charges that are similar repel each other, but charges that are distinct attract each other. There is no net charge on an electrically neutral thing.

Classical electrodynamics is the early knowledge of how charged substances interact, and it is still true for concerns that do not need the consideration of quantum events. he nets charge of an isolated system, which is the total of positive and negative charge, is a conserved attribute; it cannot change. Electric charge is carried by subatomic particles.

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Answer: R = V / I

Explanation:

P = VI (power = voltage x current)

Ohm's Law tells us that V = IR.

Substitute IR for V in the first formula: P = (IR)I = I 2 R.

Rearrange to solve for resistance: R = P / I 2.

In a series circuit, the current across one component is the same as the total current. This is not true for a parallel circuit.

According to the information we can infer that the travel angle is called a "drag" angle.

In welding terminology, the travel angle refers to the angle between the axis of the electrode and the workpiece surface. When the top of the electrode leads the welding end (meaning the electrode is inclined downward at an angle) and the welding arc is pointing back toward the weld bead, it is known as a "drag" angle.

In this configuration, the electrode is dragged along the surface of the workpiece, creating a trailing arc direction. This technique is commonly used in certain welding processes, such as shielded metal arc welding (SMAW) or stick welding, to control the heat input and the direction of the molten metal flow during the welding operation.

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The energy of photon with the wavelength of 470 nm is 4.23 × 10 ⁻¹⁹ J. The total energy of all photons is given 2.50 J. Then the number of photons reaching our eyes is 5.93 × 10¹⁸.

According to De Broglie's dual nature of matter, light behaves as both wave and particle. If the light has the particle nature, the light particles are called photons.

The energy of one photon is E = hc/λ

Where h is the Planck's constant and c be the speed of light.

given that  λ = 470 nm

h = 6.63 × 10⁻³⁴ J. s

c = 3 × 10⁸ m/s.

Then E =  ( 6.63 × 10⁻³⁴ J. s × 3 × 10⁸ m/s ) /  (470 × 10⁻⁹ m) = 4.23 × 10 ⁻¹⁹ J.

This is the energy of one photon. If the total energy is 2.50 J. The number of photons = 2.50 J / 4.23 × 10 ⁻¹⁹ J = 5.93 × 10¹⁸.

Therefore, the number of photons reaching our eyes is 5.93 × 10¹⁸.

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The electrical wires leading to your building are typically thinner than the main distribution lines.

This is because the main distribution lines are designed to carry a larger amount of electrical power across longer distances, so they require a thicker wire to minimize resistance and energy loss. In contrast, the wires leading to your building carry less power as they are intended for local distribution, which requires less electrical load and shorter distances.

The thickness of wires is determined by the amount of power they carry. The main distribution lines carry a much larger amount of power than the wires leading to individual buildings. This is because the power transmitted through the main distribution lines is distributed to multiple buildings and residential areas, whereas the wires leading to a single building are designed to carry power for that specific building's needs.

Hence, the wires leading to a building would carry less power and may be thinner than the main distribution lines.


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The maximum speed of the mass during its oscillations is 1.21 m/s (approx)

Mass (m) = 1.9 kg

Spring stiffness (k) = 180 N/m

Initial displacement (x) = 17.1 cm = 0.171 mInitial velocity (v) = 2 m/s

The maximum speed of the mass during its oscillations can be calculated using the formula:v_max = Aω

Where A is the amplitude of oscillations and ω is the angular frequency of oscillations.

Amplitude of oscillations can be calculated as:

A = x = 0.171 m

The angular frequency of oscillations can be calculated as:ω = √(k/m)

Where k is the spring constant and m is the mass of the object.ω = √(180/1.9) = 7.09 rad/s

Therefore, the maximum speed of the mass during its oscillations will be:

v_max = Aω = 0.171 × 7.09 = 1.21 m/s (approx).

Oscillation of a system can be defined as a type of motion that repeats itself after a regular interval of time. Simple harmonic motion is the type of oscillatory motion in which the motion is repeated after a fixed interval of time and this type of motion is found in a system in which the restoring force is directly proportional to the displacement of the object from the equilibrium position.

An oscillatory system can be created using a mass and spring arrangement. This arrangement is widely used in various mechanical systems such as suspension systems, shock absorbers, etc.

The maximum speed of the mass during its oscillations is equal to the product of amplitude of oscillations and angular frequency of oscillations.

The amplitude of oscillations is equal to the initial displacement of the mass from its equilibrium position and the angular frequency of oscillations is calculated using the formula, ω = √(k/m), where k is the spring constant and m is the mass of the object.

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Answer:

1,860

Explanation:

(a) The acceleration function can be found by differentiating the velocity function v(t). (b) The position function for the particle at a given time can be obtained by integrating the velocity function.

The acceleration function can be found by taking the derivative of the velocity function v(t) with respect to time. Differentiating each component of the velocity function separately, we get:

a(t) = d/dt (-cos^2(t)i - e^(-t)j + k)

    = 2cos(t)sin(t)i + e^(-t)j

So, the acceleration function is given by a(t) = 2cos(t)sin(t)i + e⁻tj.

To find the position function for the particle at a given time, we need to integrate the velocity function with respect to time. Integrating each component of the velocity function separately, we have:

∫v(t) dt = ∫(-cos²(t)i - e⁻t j + k) dt

         = ∫-cos²(t) dt i - ∫e⁻t dt j + ∫1 dt k

         = -∫cos²(t) dt i - (-e⁻t) j + t k

Using the trigonometric identity cos²(t) = (1 + cos(2t))/2, we can simplify the integral of the first component:

∫cos²(t) dt = ∫(1 + cos(2t))/2 dt

             = (1/2)∫(1 + cos(2t)) dt

             = (1/2)(t + (1/2)sin(2t))

Therefore, the position function for the particle at a given time is:

r(t) = -[(1/2)(t + (1/2)sin(2t))]i + (-e^(-t))j + tk

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The angular momentum of a system is constant if the total linear momentum of the system is zero.

The main answer is that if the total linear momentum of a system of particles is zero, the angular momentum of the system remains constant regardless of the choice of origin. Angular momentum is a measure of rotational motion and depends on the distribution of mass and velocity within the system

When the total linear momentum is zero, it implies that the system's center of mass is stationary or moving at a constant velocity. In such cases, the system's angular momentum is independent of the origin chosen for calculations.

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Answer:

9000N

Explanation:

gravitational field strength of earth is approximately 10N/kg .

900kg×10N/kg

=9000N

The main function of the throttling or expansion valve in a refrigerator is b. to reduce pressure followed by a large temperature drop of refrigerant-134a.

The refrigerant enters the expansion valve as a high-pressure, high-temperature liquid. As it passes through the valve, the pressure is reduced, which causes a large temperature drop. This cold liquid refrigerant then enters the evaporator, where it absorbs heat from the air inside the refrigerator. The hot, gaseous refrigerant then exits the evaporator and enters the compressor, where the cycle begins again.

The throttling valve is a critical component in the refrigeration cycle. It is responsible for controlling the flow of refrigerant and ensuring that the refrigerant is at the correct temperature when it enters the evaporator. If the valve is not working properly, the refrigerator will not be able to cool properly.

Here are some of the types of expansion valves used in refrigerators:

Thermostatic expansion valve (TXV): This is the most common type of expansion valve. It uses a capillary tube to control the flow of refrigerant. The capillary tube is filled with a small amount of refrigerant, and the pressure of the refrigerant in the tube determines the flow of refrigerant through the valve.

Automatic expansion valve (AXV): This type of expansion valve uses a sensor to detect the temperature of the refrigerant in the evaporator. The sensor sends a signal to the valve, which opens or closes to control the flow of refrigerant.

Electronic expansion valve (EXV): This type of expansion valve uses a computer to control the flow of refrigerant. The computer monitors the temperature and pressure of the refrigerant in the evaporator and compressor, and it uses this information to open or close the valve.

The type of expansion valve used in a refrigerator depends on the size and design of the refrigerator. TXVs are the most common type of expansion valve, but AXVs and EXVs are becoming more common in larger refrigerators.

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Circumference means path covered .

In Physics Path covered means the product of speed and time .

Mathematically, P= S t

P= 25 x 10

= 250cm is the path travelled .

Now Graphically to find out the speed variation during 0 to 3 sec -

First observation is that graph is linear , so the motion is uniform acceleration. We need to find the slope of this speed time graph to resolve the rate of change of speed.

Increase in speed per sec= Slope of Graph

Mathematically, Slope of any Graph = Rise/ run

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The cured adhesive and UV-cured diacrylate exhibited the topology of crosslinked networks.

The topology of a material refers to its molecular structure or arrangement. The cured adhesive and UV-cured diacrylate both exhibit the topology of crosslinked networks.
Crosslinking occurs when the molecules of a material are connected by covalent bonds to form a three-dimensional network. This results in a material with improved mechanical properties, such as increased strength and durability.

In the case of the cured adhesive and UV-cured diacrylate, crosslinking is achieved through a chemical reaction that occurs when the material is exposed to curing agents or UV light. The resulting crosslinked network gives the material its unique topology.

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