the work done by a force acting through a distance.

To prevent the motor speed from increasing until it fails mechanically, a load should always be connected to the motor.

A motor is designed to operate under a specific load. Without a load connected to the motor, it can spin freely and reach dangerously high speeds. This can lead to mechanical failures such as bearing damage or rotor imbalance, which can ultimately cause the motor to fail. By connecting a load to the motor, it creates a resistance that limits the speed and keeps it within a safe operating range.

The load acts as a counterforce to the motor's rotational motion, balancing the power output. It provides the necessary friction and resistance to control the motor speed. Without a load, the motor can experience a phenomenon called "overspeeding," where it exceeds its designed RPM (rotations per minute). This can result in excessive wear and tear, heat buildup, and potential damage to the motor components.

By always connecting a load to the motor, it ensures that the motor operates within its intended parameters and prevents it from reaching speeds that could lead to mechanical failure. The appropriate load for a motor depends on its design and application, and it should be chosen carefully to match the motor's specifications and requirements.

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At point a, the intensity level of the sound emitted uniformly in all directions from a small source of sound is 60.0 db, and the distance from the source is 3.20 m.

The intensity level of sound is a measure of the power of the sound waves per unit area, and it is measured in decibels (db). The intensity level of sound decreases with distance from the source due to the spreading of sound waves in all directions. In this case, the sound source is emitting sound waves uniformly in all directions, so the intensity level at point a is the same as the average intensity level at all points that are 3.20 m from the source. The intensity level of sound is related to the distance from the source by the inverse-square law, which states that the intensity of sound waves decreases with the square of the distance from the source.

In other words, if the distance from the source is doubled, the intensity level decreases by a factor of four. Therefore, if we move twice as far away from the source, the intensity level will be reduced by 6 db (since 6 db is approximately the difference in intensity level between two points that differ by a factor of two in distance).To find the intensity of the sound at point A, which is 3.20 meters away from the source and has an intensity level of 60.0 dB, we first need to use the decibel formula.

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The total voltage of the circuit is the product of the total current and resistance through the circuit. Hence, the voltage here is 2.17 ×10⁻⁹ V.

Ohm's law states that, the total voltage across a circuit is the product of the current over the circuit and the overall resistance. Let V be the voltage , I and R be the current and resistance respectively.

then,

V = IR.

Given,

R = 3.4 milli Ω = 3.4 × 10⁻³ Ω

I = 0.16 micro amperes = 0.16 × 10⁻⁶ A.

Then voltage V = IR =  0.16 × 10⁻⁶ A ×  3.4 × 10⁻³ Ω

V = 5.4 ×10⁻¹⁰ V.

This is the voltage required for one system. For all the 4 systems,

v  = 4 × 5.4 ×10⁻¹⁰ V = 2.17 ×10⁻⁹ V.

Therefore, the total voltage needed to supply the systems is 2.17 ×10⁻⁹ V.

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When humans burn wood in a fireplace or gasoline in a vehicle engine, chemical energy is transformed to thermal energy. Mechanical energy is the energy stored in things as a result of stress. Compressed springs and stretched rubber bands are instances of mechanical energy that has been stored.

Because of shorter wavelength, Blue light would release electrons with more kinetic energy. Yellow light would generate more electrons.

Blue and yellow light must have different intensities for the yellow light to emit electrons with more kinetic energy.

The yellow light must be more intense than the blue light since both lasers send the same amount of energy to the metal surface. The yellow light must therefore produce more electrons.

The expelled electrons must have a higher kinetic energy since the wavelength of blue light is shorter.

It is demonstrated by the photoelectric effect that light can behave like a particle. When photons are shone on a metal surface, electrons are expelled from the surface of the metal, which causes the photoelectric effect.

When compared to green light, the higher energy blue light ejects electrons with more kinetic energy.

No electrons are released by light below a specific frequency. In contrast, light exceeding that threshold frequency can emit electrons even at modest intensities. Electron ejection speed appears to be frequency dependent, with an increase in frequency resulting in an increase in speed.

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Differences between earthquakes at continental plate boundaries and earthquakes at mid-ocean ridges discussed in the answer.

When plates travel in the same direction and collide, this happens. The thinner, denser, and more flexible oceanic plate dips beneath the thicker, more rigid continental plate when a continental plate meets an oceanic plate. It's known as subduction.

Deep ocean trenches, like the one that runs down South America's west coast, are created by subduction. The continent's undercut rocks start to melt. On occasion, a chain of volcanoes forms as the molten rock rises to the surface and passes through the continent. Nearly 80% of earthquakes happen along convergent borders, when plates are being forced together.

Shallow earthquakes, often less than 30 km deep, occur in small bands adjacent to plate borders along mid-ocean ridges and transform edges. There are earthquakes in subduction zones at various depths, some of which are more than 700 km deep. Because they occur everywhere throughout the subducting slab that stretches beneath the opposing plate, earthquake bands are wider along subduction zones. Wide areas of distributed earthquakes may be associated with collision zones between continents, such as those between the Eurasian plate and the plates to the south of the African, Arabian, and Indian tectonic arcs.

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Answer:

a) 588.235 ohm ( all the 3 resistors are in parallel )

b) 10 A

c) Current flowing -

in 20 ohm resistor = 6.25 A

in 100 ohm resistor = 1.25 A

in 50 ohm resistor = 2.5 A

d) Voltage drop across all the resistor = 125 V

(As all the resistors are in parallel all the resistors will have the same voltage drop )

e) Power dissipated -

in 20 ohm resistor = 781.25 W

in 100 ohm resistor = 156.25 W

in 50 ohm resistor = 312.5 W

(Power = Current × Potential Difference)

Answer:

✔️Car A and Car B are moving in opposite directions.

✔️Car A is moving faster than Car B.

✔️Car A started ahead of car B.

Explanation:

The position-time graph shows Car A and Car B. The graph reveals that both cars are moving in opposite directions.

Car A shows a positive slope and Car B shows a negative slope.

The graph also shows that Car A started ahead of Car B. It's seen from the graph that Car A started from the origin.

Therefore, we conclude that the correct statements are:

✔️Car A and Car B are moving in opposite directions.

✔️Car A is moving faster than Car B.

✔️Car A started ahead of car B.

Answer:

merry cristmas the other person answered right I checked for you

Explanation:

happy NEW YEARS FINALLY NO MORE 2020

Answer: The advantage is it doesn't tip over as quickly therefore the rider is less likely to get hurt. The disadvantage is the rider won't be able to learn how to balance because they didn't use the bicycle and the tricycle already balanced for you.

Explanation:

Hope this helps comment if you need more help!

Answer:

I would think B for the answer

Answer:

B

Explanation:

To find the speed at which the bicycle is traveling, we can use the formula that relates the circumference of the wheel to the distance covered in one revolution. By multiplying the circumference by the number of revolutions per minute, we can determine the speed of the bicycle.

The circumference of a circle can be calculated using the formula C = 2πr, where r is the radius of the circle. In this case, the bicycle wheels have a diameter of 26 inches, so the radius is half of that, which is 13 inches. Converting the diameter to inches, the circumference of each wheel is 2π(13) = 26π inches.

Given that the wheels are rotating at 160 RPM, we can multiply the circumference by the number of revolutions per minute to find the distance covered in one minute. This can be converted to the speed in inches per minute.

To obtain the speed in a more common unit, we can convert inches per minute to miles per hour by using appropriate conversion factors. Finally, rounding the answer to three decimal places provides the speed at which the bicycle is traveling down the road.

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Answer:

must double the force, with the same masses you get twice the acceleration.

Explanation:

Newton's second law establishes a relationship between force and acceleration where the constant of proportionality is mass

        F = m a

To prove these relationships you must double the force, with the same masses you get twice the acceleration.

     2F = m 2a

The downside is that if you double the mass, the acceleration stays the same.

    2F = 2m   a

Answer:

acceleration is zero m/s²

Explanation:

It is given that the train travels at constant speed (i.e speed does not change)

If speed does not change, then the train is neither accelerating or decelerating (i.e acceleration is zero)

Answer:

An object with no net forces acting on it which is initially at rest will remain at rest. If it is moving, it will continue to move in a straight line with constant velocity. Forces are "pushes" or "pulls" on the object, and forces, like velocity and acceleration are vector quantities.

Explanation:

Answer:

Momentum is a vector quantity that has the same direction as the velocity of the object. The quantity of force multiplied by the time it is applied is called impulse. Impulse is a vector quantity that has the same direction as the force. Momentum and impulse have the same units: kg·m/s

Explanation:

Hope it helps!

If you dont mind can you please mark me as brainlest?

Answer:

Time = 11.60 seconds.

Explanation:

Speed can be defined as distance covered per unit time. Speed is a scalar quantity and as such it has magnitude but no direction.

Mathematically, speed is given by the equation;

\(Speed = \frac{distance}{time}\)

Given the following data;

Speed = 0.711m/s

Distance = 8.25m

To find the time;

Making time the subject of formula, we have;

\(Time = \frac{distance}{speed}\)

Substituting into the equation, we have;

\(Time = \frac{8.25}{0.711}\)

Time = 11.60 secs.

Answer:

1 B      2 D  3  D    4 DC  wire  ferrite   5 D

Explanation:

The drift velocity of the electrons in the wire is directly proportional to the applied electric field.
The drift velocity will increase by a factor of 4.67 when the wire is connected to a DC electric source of 7.0 V.

To determine the factor by which the drift velocity changes, we need to consider the relationship between drift velocity (v), current (I), and voltage (V). This relationship is given by Ohm's law:

V = IR

Where R is the resistance of the wire, which remains constant in this situation. The drift velocity is proportional to the current, so we can express the change in drift velocity as a ratio of currents:

(I2/I1) = (V2/R)/(V1/R)

Since R is constant, it cancels out:

I2/I1 = V2/V1

Now, you can plug in the given voltage values:

I2/I1 = 7.0 V / 1.5 V = 4.67

So, the drift velocity changes by a factor of 4.67 when the wire is connected to a 7.0 V DC electric source compared to a 1.5 V battery.

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In accordance with Boyle's law, the volume of the gas would increases as the pressure increases.

Boyle's law states that, the volume of a given mass of gas is inversely proportional to the pressure at constant temperature. We have been told that the temperature does not change.

Now, the pressure decreases with height thus the volume of the gas in the balloon increases and then as the volume increases, the balloon is now found to burst. This is of course an expression of the Boyle's law.

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Answer:

acceleration is the answer

Answer:

Acceleration

Explanation:

Answer:

55 m/s w

Explanation:

Answer:

Newton's first law states that every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force

Answer:

An object in motion will stay in motion unless acted on by an unbalanced force.

An object at rest will stay at rest unless acted on by an unbalanced force.

An object in motion will stay in motion, and an object at rest will stay at rest unless acted on by an unbalanced force

(There are three parts to Newton’s First Law of Motion)

Answer:

the moment of force is 25 Nm.

Explanation:

Given;

weight of the book, F = 50 N

distance through which his hand was stretched, d = 50 cm = 0.5 m

The moment of force is calculated as;

moment of force = F x r

moment of force = 50 N x 0.5 m

moment of force = 25 Nm

Therefore, the moment of force is 25 Nm.

Answer:

A balance and a beaker of water!

Explanation:

Krishne wants to measure the mass and volume of a key. The tools that are to be used are – a balance and a beaker of water.

Mass will be represent with the amount of matter that is in an object. This will be measured in terms of kilogram. The mass can easily be measured with balance.

Volume is the quantity of matter that is in the object. This is measured in terms of cubic meter. If you drop the key in a beaker of water, the water inside the beaker will increase and this increases the volume of water that will be equal to volume of key.

Answer:

The question does not state how the answer is to be entered. I would use 10% because that is most common.

Explanation:

You are using 300 J of energy to get 30 J of light energy. The fact that you can account for the left over energy is not relevant.

Efficiency = Work Out / Work In

Efficiency = 30 J / 300 J  = 0.1

If you need this as a %, you can multiply by 100

Efficiency = 0.1 * 100 = 10%

The gravitational parameter for the Sun, denoted by μ (mu), is given as 1 AU³/TU². There are approximately 422,437 days in 1 TU. There are approximately 8.647 × 10⁻⁴ TUs in 1 year (365.25 days).

To determine the length of 1 TU (Time Unit) in days, we need to convert the astronomical unit (AU) and the gravitational parameter into more familiar units.

The astronomical unit (AU) is a unit of distance, representing the average distance between the Earth and the Sun, which is approximately 149.6 million kilometers (km).

The gravitational parameter (μ) relates to the gravitational force between two bodies and is expressed in units of distance cubed per time squared.

Given that the gravitational parameter for the Sun is 1 AU³/TU², and the average distance between the Earth and the Sun is 149.6 million km, we can set up the following equation:

(1 AU³/TU²) = (149.6 million km)³ / 1TU²

Simplifying this equation, we can solve for 1 TU in days:

1 TU = sqrt((149.6 million km)³ / (1 AU³)) days

Now, let's calculate the value of 1 TU in days:

1 TU = sqrt((149.6 million km)³  / (1 AU³ )) days

≈ sqrt((149.6³ ) million³  km³ ) / (1 AU) days

≈ sqrt(3.8416 * 10²¹ km³ ) / (1 AU) days

≈ sqrt(3.8416 * 10²¹) / (1 AU) * km^(3/2) days

≈ 6.324 * 10¹⁰ km^(3/2) / (1 AU) days

To convert this into a numerical value, we need to know the exact value of 1 AU in kilometers. The currently accepted value for 1 AU is approximately 149.6 million km.

Therefore, substituting the value of 1 AU = 149.6 million km, we get:

1 TU ≈ 6.324 * 10¹⁰ km^(3/2) / (149.6 million km) days

≈ 422,437 days

Hence, there are approximately 422,437 days in 1 TU.

Moving on to the second part of the question, to determine how many TUs are in 1 year (365.25 days/year), we can set up the following ratio:

365.25 days / 1 year = X TUs / 1 year

Solving for X (the number of TUs in 1 year):

X = (365.25 days / 1 year) * (1 TU / 422,437 days)

≈ 8.647 × 10⁻⁴ TUs/year

Therefore, there are approximately 8.647 × 10⁻⁴ TUs in 1 year (365.25 days).

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Gravity causes cast of gases to clump together to begin forming new stars and planets.

Gravity binds the gas and dust together. If the cluster is large enough, it produces a star—increased pressure from gravitational collapse boosts the temperature, forcing nuclear fusion to occur in its center.

The dust and gases in a nebula are widely dispersed, yet gravity can gradually bring clumps of dust and gas together. As these clusters grow in size, their gravity grows stronger and stronger. The clump of dust and gas eventually becomes so large that it collapses due to its own gravity.

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The correct answer is option C:

According to modern ideas and observations, the location of the center of our expanding universe explains that the universe does not have a center.

Our universe is composed of three kinds of substances that are dark matter, normal matter, and dark energy.

Everything in the universe is made of normal matter i.e. planets, stars, human beings, and all other visible objects.

Astronomers have theorized that the universe is expanding at a faster rate. Between any two given points, the distance of the universe is increasing and so we can predict that the universe will be 2x in size after ten billion years.

In general, the universe has no central point and it is expanding continuously because of a dark, mysterious force that is pulling the universe apart.

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