If the current in a circuit is 3. 2 mA and the resistance of the wire used in the circuit is 250 Ω, what is the voltage of the fuel cell being used?



Formula;



Calculation;



Answer:

Acoustic power, also known as sound intensity, is defined as the power transmitted by a sound wave per unit area in a direction perpendicular to that area.

A sound wave is a type of energy that propagates in a medium by adiabatic charging and discharging. Important quantities for describing sound waves are sound pressure, particle velocity, particle displacement, and sound intensity.

Sound waves can be classified into three categories:

Longitudinal waves, mechanical waves, pressure waves.

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Hello User!

The Core difference is that heat deals with thermal energy, whereas temperature is more concerned with molecular kinetic energy. Heat is the transfer of thermal energy, whereas temperature is a property the object exhibits

Hope this help :)

The intensity of the light that is emitted at different wavelengths by a light-emitting source is described by the emission spectrum. The correct option is b.

The emission spectrum is a graphical representation of the different wavelengths of light emitted by a source, and their respective intensities. It can be used to identify the chemical composition of the source, as different chemicals emit light at specific wavelengths.

The emission spectrum is related to excitation, which is the process by which the source is excited or energized to emit light. Excitation can be achieved through various means, such as heat, electricity, or radiation. The resulting emission spectrum will depend on the nature of the excitation.

On the other hand, absorption spectrum is the opposite of emission spectrum, which describes the wavelengths of light that are absorbed by a material. Incandescence refers to the emission of light by a heated material, while fluorescence and phosphorescence describe the emission of light by a material after it has been excited by light or other forms of energy. Finally, a laser is a device that emits a coherent beam of light through the process of stimulated emission.

Hence, the correct option is b.

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Answer:

120°

Explanation:

Given forces with magnitude F and F

Applying the parallelogram law of vector

Where resultant is given as :

R = √(A^2 + B^2 + 2ABCos Ф

WHERE A and B are two forces with angle Ф

F =√(F^2 + F^2 + 2F * F Cos Ф

Square both sides

F^2 = F^2 + F^2 + 2F^2 CosФ

F^2 - 2F^2 = 2F^2 CosФ

- F^2 = 2F^2 Cos Ф

Divide both sides by 2F^2

- 1 / 2 = CosФ

Cosine(theta) = - 1/2

Ф = cosi^-1 (-1/2)

Ф = 120°

Type SE cable with an insulated neutral conductor is permitted for hooking up an electric range in a new branch circuit. Type SE cable with an insulated neutral conductor is permitted for hooking up an electric range in a new branch circuit.

Type SE Cable is primarily utilized for supplying power from a service drop to the meter base and from the meter base to the distribution panelboard; it is frequently utilized as a branch circuit as well.In an electric range branch circuit, a neutral wire is required to be run along with the two hot wires because of the 240V circuits. The NEC code specifies that the branch circuit supplying an electric range must have an ampacity rating of at least 40 amps. It should be equipped with a grounding conductor of a wire gauge equal to or larger than No. 10. The ampacity of the cable should not be less than the rated capacity of the electric range.For electric ranges, Type SE cable with an insulated neutral conductor can be used as long as the cable meets the above-mentioned requirements.

This type of cable is widely utilized in residential and commercial construction applications because it is simple to install and connect to the breaker panel. Furthermore, it provides a significant amount of insulation against heat and moisture, making it appropriate for use in high-temperature applications.The neutral conductor is insulated in the Type SE cable, which indicates that the metal sheath is utilized as a grounding conductor rather than the neutral conductor. This provides an additional layer of protection against electrical shock and fire, making it an excellent option for use in electric range branch circuits. For those who want to wire their electric range with Type SE cable, be sure to follow all of the applicable electrical codes.

Type SE cable with an insulated neutral conductor is permitted for hooking up an electric range in a new branch circuit, provided it meets certain specifications. The cable should have an ampacity rating of at least 40 amps and be equipped with a grounding conductor of a wire gauge equal to or larger than No. 10. The ampacity of the cable should not be less than the rated capacity of the electric range. Type SE cable is widely used in residential and commercial construction because it is simple to install and offers insulation against heat and moisture, making it appropriate for use in high-temperature applications. The neutral conductor is insulated in the Type SE cable, which provides an extra layer of protection against electrical shock and fire. If you want to wire your electric range with Type SE cable, make sure you follow all the relevant electrical codes.

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Answer:

11. A small number of alpha particles being deflected at large angles suggested that there is a concentration of positive charge in the atom

12. describes properties of the atom

13. 1913

14. quantum state with all observable (atoms) independent of time.

15. the lowest energy state of an atom or other particle

Explanation:

Answer:

weight hung from the spring

Explanation:

An "independent variable" refers to the variable that is being changed or manipulated in an experiment. This is being done in order to check its impact on the "dependent variables." The independent variable does not rely on any other variables.

In the experiment above, the independent variable is the "weight." This variable is being manipulated in order to know how far the spring will stretch. This is the reason why there are five different weights, which means there will be five different distances expected to be covered by the spring.

The magnitude of the cyclist's displacement is 3.402 km.

To find the magnitude of the cyclist's displacement, need to find the straight-line distance from her starting point to her ending point, which will be the length of the hypotenuse of a right triangle formed by her westward and northward displacements.

Using the Pythagorean theorem, calculate the magnitude of her displacement as follows:

magnitude of displacement = √((2.07 km)² + (2.70 km)²)

= √(4.2849 km² + 7.29 km²)

= √(11.5749 km²)

= 3.402 km

Therefore, the magnitude of the cyclist's displacement would be 3.402 km.

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Answer:

acceleration due to gravity is always going to be 9.8m/s^2 whenever an object is freely falling.

Explanation:

You could also divide 49.1 m/s by 5s to get an acceleration of 9.8 m/s^2 as well.

Answer:=7x−7

Explanation:

=2x+5x+−7

=(2x+5x)+(−7)

=7x+−7

Assuming that the altitude of the aircraft is at the minimum altitude required for the approach, which is 1,500 feet above the ground at LIT airport, the vertical descent angle and rate of descent on final approach would be:

The descent angle for an RNAV (GPS) approach to runway 36 at LIT is 3.00 degrees. Therefore, to calculate the descent rate, we will need to convert the groundspeed of 105 knots to feet per minute (fpm) by multiplying it by 101.3 (the conversion factor from knots to fpm).

105 knots x 101.3 = 10,641 fpm

To find the rate of descent at a 3.00-degree glide path, we will use the following formula:

Descent Rate = Tan (Glide Path Angle) x Groundspeed

Descent Rate = Tan (3.00 degrees) x 10,641 fpm

Descent Rate = 574.8 fpm

Therefore, at a groundspeed of 105 knots, the vertical descent angle and rate of descent on final approach for an RNAV (GPS) approach to runway 36 at LIT would be 3.00 degrees and 574.8 fpm, respectively.

On the RNAV (GPS) RWY 36 approach to LIT, with a groundspeed of 105 knots, the Vertical Descent Angle (VDA) is typically 3.0 degrees. To calculate the Rate of Descent (ROD), use the formula: ROD = (Groundspeed × VDA) / 2. For your situation, it would be: (105 knots × 3.0°) / 2 = 157.5 feet per minute (FPM). So, your vertical descent angle is 3.0 degrees, and your rate of descent is approximately 157.5 FPM on final approach.

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Answer:

In order to check its magnetic properties and for removing impurities.

Explanation:

A scientist use a magnet and small strainer while investigating the physical properties of a substance in order to check the magnetic properties of the substance as well as to separate the substance from the other impurities. Magnet attract substances that is made of metals or magnetic characteristics while on the other hand, small strainer is used to separate impurities from the investigating substance so that's why the scientist use a magnet and small strainer during investigation of a substance.

A scientist use a magnet to check magnetic properties of the substance  and use small strainer to separate the substance from the other impurities.

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Therefore, the tension in the cord connected to the 8.3 kg block is 86.79 N. Therefore, the acceleration of the three-block system is \(6.3 m/s^2.\)

Part 1:

Acceleration of the three-block system

Firstly, let's find the force acting on the three blocks towards the right:

Force due to gravity acting on 8.3 kg block = 8.3 × 9.8

Force due to gravity acting on 2.7 kg block = 2.7 × 9.8

Force due to gravity acting on 2.3 kg block = 2.3 × 9.8

Acceleration towards the right, a = (8.3 × 9.8 - 2.7 × 9.8) / (11 + 9.8 × 0.12)

= (81.34 - 26.46) / 11 + 1.176

= \(6.3 m/s^2\)

Part 2:

Tension in the cord connected to the 2.7 kg block

For the block of mass 2.7 kg, we have:

Tension T - friction f = ma

The force acting downward: m × g = 2.7 × 9.8 = 26.46 N

Force acting on the body is T

The force of friction: f = coefficient of friction × Normal force = 0.12 × 2.7 × 9.8 = 3.168 N

Total force acting on the body is F = T - f

Total force F = 2.7 × a (from equation T - f = ma)

Solving for T, we get:

T = F + f

T = 2.7a + 3.168

The acceleration of the system is \(6.3 m/s^2\). Therefore,

T = 2.7 × 6.3 + 3.168

= 20.646 N

Therefore, the tension in the cord connected to the 2.7 kg block is 20.646 N.

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A projectile is fired into a region of no air resistance the horizontal component of velocity remains constant because projectiles

A) is not acted on by any horizontal force

Velocity remain constant until unless any net external force acts on the object . While in a projectile motion , there is a gravitational force which act in downward direction . And there is no horizontal force , hence horizontal velocity remain unchanged . Velocity remains constant because projectiles

A) is not acted on by any horizontal force

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Answer:

=(220^2 +150^2)

/

put this on a square root

for you to get 266.2705391

round it to a whole number =266km/h

Explanation:

p

The tiny ripples in the background radiation COBE found are due to the quantum fluctuations that occurred during cosmic inflation.

What is COBE?

The Cosmic Background Explorer (COBE) is a satellite that was launched in 1989 to study the cosmic microwave background radiation. It was the first satellite mission dedicated solely to cosmology, and it provided groundbreaking insights into the early universe.

What is the cosmic microwave background radiation?

The cosmic microwave background radiation is a faint glow of electromagnetic radiation that permeates the entire universe. It is thought to be the remnant of the Big Bang, and it has been detected in every direction of the sky.

What are quantum fluctuations?

Quantum fluctuations are tiny variations in the energy density of the early universe. They are a natural consequence of the uncertainty principle in quantum mechanics, and they played a crucial role in the formation of the large-scale structure of the universe.

What is cosmic inflation?

Cosmic inflation is a period of exponential expansion that occurred in the early universe. It is thought to have happened within the first 10^-32 seconds after the Big Bang, and it is responsible for the large-scale homogeneity and isotropy of the universe. Cosmic inflation was proposed in the early 1980s to solve some of the problems with the Big Bang model.

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The number of revolutions per minute which a 25 m diameter ferris wheel would need to make for the passengers to feel weightless is 7.84 rotations per minute.  

The rotational speed of a ferris wheel needs to reach 8.5 revolutions per minute (RPM) for passengers to experience weightlessness. To calculate the RPM of a 25m diameter ferris wheel, use the formula:

RPM = (distance/circumference) × 60.

The circumference of a 25 m ferris wheel is 157.07m. Therefore, the RPM of a 25m ferris wheel would be:

RPM = (25m/157.07m) × 60 = 7.84 RPM

Therefore, a 25m ferris wheel would need to rotate at a rate of 7.84 RPM for passengers to experience weightlessness.

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There are correlation and causation between the force of the finger and the movement of the books.

A force is an effect that tends to move a stationary object into motion, stop a moving object, alter the speed and direction of a moving object, or alter the size and shape of a body.

When the student pushes the first book, she applies force on it and the book begins to fall. The book falls on second one and second book falls on third one - thus the process is going on until fifth book falls.

So, there must have correlation and causation between the force of the finger and the movement of the books.

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The efficiency of the engine is 60%.

The efficiency of a heat engine describes the amount of input energy converted into useful work.

It also entails the amount of useful work done by the engine. The greater the amount of useful work done by the engine, the greater the efficiency of the engine.

The efficiency of an engine ranges from 0 to 100%.

If there four stages in the energy conversion cycle, and 10% energy is wasted in each cycle, the total energy wasted in the four cycles is calculated as;

Total wasted energy = 4 x 10% = 40%

Efficiency of the engine = Useful energy = 100% - 40% = 60%

Thus, the efficiency of the engine is the useful work done by the engine.

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Answer:

it is used on hard disk drives, speakers, motors, mri machines, and generators

Explanation:

there ya go

A bypass valve is used in the design of fluid power system filters to route fluid around the filter element if it becomes clogged during system operation.

The bypass valve's job is to maintain constant fluid flow throughout the system even if the filter becomes clogged or reaches its filtration limit. The bypass valve opens when the filter element clogs, allowing fluid to pass through the filter and continue to circulate through the system.

This keeps the flow from completely stopping and guarantees that the system keeps working, albeit with less effective filtering. The bypass valve aids in maintaining system functionality by diverting fluid around the blocked filter, preventing any damage or disruption brought on by restricted flow.

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Answer: The answer is (D)Reduced impact time will increase the impact force.

The magnitude of force acting on the opposite direction of the block of mass 10 kg that has an acceleration of 2 m / s² is 22.5 N

Let the force of 85 N be F1 and the force acting on the opposite direction be F2.

Resolving F1 into its horizontal component,

F1x = F1 cos θ

F1x = 85 cos 60°

F1x = 85 * 0.5

F1x = 42.5 N

∑ Fx = m a

F1x - F2 = 10 * 2

42.5 - F2 = 20

F2 = 22.5 N

Therefore, the magnitude of force is 22.5 N

The given question is incomplete. The complete question is:

A block has a ma of 10 kg. If a force of 85 N is exerted at an angle 60 degree relative to the horizontal, and a second force of unknown magnitude is exerted in the opposite direction straight, and the block accelerate at 2 m/s^2 to the right, find the unknown magnitude.

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Answer:

You have no graph on the post.

Based on the observations in the prelab, the size of the ball chosen did not have any effect on the observed acceleration.

The correct answer would be: No, there was no observable correlation between ball size and acceleration it varied a lot

The size of the ball, whether larger or smaller, did not have a significant effect on the acceleration experienced by the ball.

The acceleration observed in the prelab was likely primarily influenced by the gravitational force acting on the ball. The acceleration due to gravity is determined by factors such as the mass of the planet and the distance from its center, as described by the equation:

a =

In this equation, a represents the acceleration due to gravity, G is the gravitational constant, M is the mass of the planet, and r is the distance from the planet's center. Notably, the size of the ball, referring to its diameter or volume, does not directly impact these parameters.

It is important to note that other factors, such as air resistance, may have influenced the observed variations in acceleration. The shape, density, and surface area of the ball can affect the extent of air resistance experienced during its motion. However, these factors are separate from the size of the ball itself.

Therefore, based on the prelab observations, it can be concluded that the size of the ball chosen did not have a significant effect on the observed acceleration. The variations in acceleration were likely influenced by factors other than the size of the ball, such as air resistance.

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Answer:

Peters image will grow bigger

Explanation:

In this situation, only Peter is at rest and the mirror is in motion at 1.5m/s heading towards Peter.

From afar, Peter will look small in the mirror that is his image will be small When the mirror is moved at 1.5m/s Peter being the observer will notice that his image grows bigger and bigger.

1. Heat = 3 kg x 900 J/kg°C x (95°C - 40°C) = 27000 J.

2. Change in Temperature = 780 J / (4.1 kg x 385 J/kg°C) = 2.02°C.

3. Specific Heat Capacity = 15686 J / (1.1 kg x (47°C - 16°C)) = 1479.2 J/kg°C.

4. Heat = 0.778 kg x 4186 J/kg°C x (94°C - 26°C) = 200508 J.

5. Sample 3 has the highest specific heat capacity because it has the    greatest temperature change for the same amount of heat applied.

Energy is the ability to do work, or the capacity to produce an effect. It can be classified into two main forms — kinetic energy, which is the energy of motion, and potential energy, which is stored energy due to an object's position or state.

1: The amount of heat needed to raise the temperature of a 3 kg sample of aluminium from 40°C to 95°C is 27000 J.

This can be calculated by using the formula: Heat = Mass x Specific Heat Capacity x Change in Temperature.

Therefore, Heat = 3 kg x 900 J/kg°C x (95°C - 40°C) = 27000 J.

2: The temperature change of a 4.1 kg sample of copper when 780 J of energy is applied is 2.02°C.

This can be calculated by using the formula: Change in Temperature = Heat / (Mass x Specific Heat Capacity).

Therefore, Change in Temperature = 780 J / (4.1 kg x 385 J/kg°C) = 2.02°C.

3: The specific heat capacity of iron is 1479.2 J/kg°C.

This can be calculated by using the formula: Specific Heat Capacity = Heat / (Mass x Change in Temperature).

Therefore, Specific Heat Capacity = 15686 J / (1.1 kg x (47°C - 16°C)) = 1479.2 J/kg°C.

4: The amount of heat removed to lower the temperature of a 0.778 kg sample of water from 94°C to 26°C is 200508 J.

This can be calculated by using the formula: Heat = Mass x Specific Heat Capacity x Change in Temperature.

Therefore, Heat = 0.778 kg x 4186 J/kg°C x (94°C - 26°C) = 200508 J.

5: Sample 3 has the highest specific heat capacity because it has the greatest temperature change for the same amount of heat applied. This means that Sample 3 requires more energy to increase its temperature than Samples 1 and 2, thus indicating that it has the highest specific heat capacity.

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