Please help me make a circuit that mainly includes a transistor to a a drive dc motor that works in a clockwise direction when the switch is off and counterclockwise when the switch is on. the circuit should also have LDR, Stepper Motor, Switch, DC Motor, and resistors

When a completely smooth ball is simply rolling on a perfectly flat surface, there is no resistance between the surface and the ball, hence the ball is not slowed by the friction.

Realize that work implies that the operating force—here, friction—cause relative motion between the bodies. This may seem counterintuitive (that is, force from friction would need to cause the ball to move sideways relative to whatever it is rolling on). In pure rolling, the ball rotates around an axis but does not translate with respect to its point of contact with the surface (in pure rolling that point of contact is instantaneously stationary).

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The magnitude of the force exerted by the +20 μC charge on the +23 mC charge at a distance of 21 cm is approximately 2.96 N.

To calculate the magnitude of the force exerted by one charge on another, we can use Coulomb's Law. Coulomb's Law states that the force between two charges is directly proportional to the product of their magnitudes and inversely proportional to the square of the distance between them.

The formula for the magnitude of the force (F) between two charges (q1 and q2) separated by a distance (r) is given by:

F = k * |q1| * |q2| / r^2

Where:

F is the magnitude of the force

k is the electrostatic constant (k ≈ 8.99 × 10^9 N m^2/C^2)

|q1| and |q2| are the magnitudes of the charges

r is the distance between the charges

Given:

q1 = +20 μC = +20 × 10^(-6) C

q2 = +23 mC = +23 × 10^(-3) C

r = 21 cm = 21 × 10^(-2) m

Plugging in the values into the formula:

F = (8.99 × 10^9 N m^2/C^2) * |20 × 10^(-6) C| * |23 × 10^(-3) C| / (21 × 10^(-2) m)^2

Calculating the numerical value:

F ≈ 2.96 N

Therefore, the magnitude of the force exerted by the +20 μC charge on the +23 mC charge at a distance of 21 cm is approximately 2.96 N.

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Answer:

Option A. 500

Explanation:

From the question given, we obtained the following:

Numbers of home with pet dogs = 250

Percentage with pet dogs = 50%

Total number of homes =.?

Thus, we can obtain the total number of homes represented by the chart as follow:

Let T be the total number of Homes.

Number of homes with dog = percentage of homes with dog × total number

Numbers of home with pet dogs = 250

Percentage with pet dogs = 50%

Total number of homes = T

250 = 50% × T

Divide both side by 50%

T = 250 ÷ 50%

T = 250 ÷ 50/100

T = 250 × 100/50

T = 250 × 2

T = 500

Therefore, the total number of homes represented by the chart is 500.

Answer:

like this

Explanation:

The average distance of the moon from the sun is approximately 1 astronomical unit (AU).

An astronomical unit is defined as the average distance between the Earth and the Sun, which is about 149.6 million kilometers or 93 million miles. The moon orbits the Earth, not the Sun. Its average distance from the Earth is approximately 384,400 kilometers or 238,900 miles. Therefore, when considering the moon's distance from the sun, we can approximate it as the same distance as the Earth's distance from the sun. The average distance of the moon from the sun being 1 AU is a result of the moon being relatively close to the Earth in comparison to the vast distances involved in our solar system. This distance is crucial for maintaining the stability of the Earth-moon system and ensures that the moon remains within the gravitational influence of the Sun-Earth system.

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Answer:

15kg

Explanation:

mass = weight / gravitational field strength

mass = 150 / 9.8 = 15kg (nearest whole no)

The mass of the object on earth whose weight is 150 N will be 15.3 Kg

Mass is the amount of matter present inside a body. It is defined as the product of density and volume. It remains constant through out the universe. Mathematically -

M = ρV

where -

M is Mass

ρ is density

V is volume

Given is your weight on earth which is equivalent to 150 N.

We know that the weight of of an object is a force exerted by the earth towards its center. It can be written as -

W = mg

Weight of the object = [W] = 150 N

Acceleration due to gravity on earth = [g] = 9.8 m/s²

Substituting the values -

150 = m x 9.8

m = 150/9.8

m = 15.3 Kg

Therefore, the mass of the object on earth whose weight is 150 N will be 15.3 Kg.

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compressed0.32 meters

Explanation

Step 1

The force exerted by a spring on objects attached to its ends is proportional to the spring's change in length away from its equilibrium length and is always directed towards its equilibrium position.

so

let

replace and solve for x

the negative symbol indicates the spring is compresed

so, the answer is

0.32 meters

I hope this helps you

The answer for Eating food from a uranium glass plate is safer is Choice C which is food is irradiated / not contaminated.

It is safer to eat food from a uranium glass plate because the uranium added to the glass will always be in the oxidized form used to color it. The uranium added to the glass will also be not soluble thus it will not be radioactive.

Thus, the reason for eating food safely from the uranium glass plate is it will not be contaminated

The other two options(alpha cannot penetrate skin or body and contains a low percentage of uranium) will be wrong because the plate will be completely non-radioactive.

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Gravity's acceleration is 9.8 m/s², The speed of each seat is 11.63 m/s.

Define acceleration of gravity?

Acceleration due to gravity is also acceleration, but acceleration is only concerned with the force of gravity, whereas acceleration is concerned with any force.

The acceleration due to gravity on any body is the acceleration with which the earth attracts the body towards itself as a result of the earth's gravitational field. The acceleration due to gravity is the acceleration with which a body moves towards the earth due to gravity.

The gravitational force between two objects is affected by the distance between their centres of mass, so the force of gravity on an object is smaller at the equator than at the poles. Because of this effect, gravitational acceleration is about 0.18% lower at the equator than at the poles.

given data:

diameter = 7.83 m

mass = 10 kg

distance = 3.3 m

angle = 43.5°

acceleration of gravity = 9.8 m/s²

for speed we will apply here formula that is express as

speed = √(Rg/tanθ )    ......................1

put here all value in equation 1 we get

here R = diameter /2 + mass × sin43.5

R = 7.83/2 + 10(0.463)

R= 8.545 m

speed =  √(8.545(9.8)/tan(90-43.5) )

speed = 11.63 m/s

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Yes, it will be safe to have the turbine component operate at 1150°C

Based on the given information, the melting temperatures of iron and titanium are 1538°C and 1668°C, respectively. In an iron-titanium alloy, these two elements are combined, resulting in an intermediate melting temperature. This alloy would have a higher melting temperature than pure iron and lower than pure titanium.

Operating the turbine engine at 1150°C would be safe, as this temperature is significantly below the melting temperatures of both elements. It provides a sufficient margin of safety for the alloy, ensuring that it remains solid and stable during operation. Additionally, alloys typically have improved mechanical properties, such as increased strength and resistance to wear, compared to their constituent elements. This makes iron-titanium alloys suitable for high-temperature applications like turbine engines.

In summary, using an iron-titanium alloy for a turbine engine operating at 1150°C should be safe and appropriate due to its enhanced mechanical properties and melting temperature range.

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The x-coordinate of the center of mass of the uneaten pizza above the x-axis is -1.5 in.

The x-coordinate of the center of mass of the uneaten pizza above the x-axis (second quadrant) can be found by taking the average of the x-coordinates of the points in that quadrant.

To find the x-coordinate of the center of mass, we need to determine the average x-coordinate of the uneaten pizza in the second quadrant.

In the given scenario, the center of mass of the partially eaten pizza is located at Xcm = -1.5 in. This means that the uneaten pizza in the second quadrant is symmetric with respect to the y-axis.

Since the uneaten pizza is symmetrical, the x-coordinate of the center of mass of the uneaten portion above the x-axis will also be -1.5 in. This is because the uneaten portion is evenly distributed in the second quadrant, resulting in an equal distribution of mass on both sides of the y-axis.

Therefore, the x-coordinate of the center of mass of the uneaten pizza above the x-axis is -1.5 in.

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The complete question is:

The location of the center of mass of the partially eaten, 12-inch diameter pizza shown in the figure (Figure 1) is Xcm = - 1.5 in

and Ycm = -1.5 in . Assuming each quadrant of the pizza to be the same, find the center of mass of the uneaten pizza above the x axis (that is, the portion of the pizza in the second quadrant). Find the x-coordinate.

If an asteroid collides with  Earth and causes the day to become 27.0% longer, the mass of the asteroid can be approximately m = (0.27 * Ie)/(Io - Io').

The angular momentum of the Earth before and after the collision must be the same, so the product of the Earth's moment of inertia, angular velocity, and radius must equal the sum of the Earth's and asteroid's momenta of inertia, angular velocities, and distances from the Earth's axis of rotation. Solving for the mass of the asteroid, we get m = (0.27 * Ie)/(Io - Io'), where Ie is the Earth's moment of inertia, Io is the Earth's moment of inertia before the collision, and Io' is the Earth's moment of inertia after the collision.

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The correct option is B: The tension on the aluminum wire is approximately 65 N.

To find the tension on the aluminum wire, we can use the formula for the speed of transverse waves in a string:

v = √(T/μ)

where:

v = speed of transverse waves

T = tension in the wire

μ = linear mass density (mass per unit length) = density * area

First, let's calculate the area of the aluminum wire:

Given diameter = 4.6 mm

Radius = diameter/2 = 4.6 mm / 2 = 2.3 mm = 2.3 x \(10^(^-^3^)\) m

Area = π * \(r^2\)

      = π * (2.3 x 10⁽⁻³⁾)²

      = π * (5.29 x 10⁽⁻⁶⁾)

      ≈ 1.658 x 10⁽⁻⁵⁾ m²

Now, let's calculate the linear mass density (μ):

Density of aluminum = 2700 kg/m³

Linear mass density (μ) = density * area

                       = 2700 kg/m³ * 1.658 x 10⁽⁻⁵⁾ m²

                       ≈ 0.0447 kg/m

Now, we can rearrange the formula for the speed of transverse waves to solve for tension (T):

T = μ * v²

Given v = 38 m/s and μ = 0.0447 kg/m, we can calculate T:

T = 0.0447 kg/m * (38 m/s)²

 ≈ 63.9906 N

Rounding to the nearest whole number, the tension on the wire is approximately 64 N.

Therefore, the closest option from the given choices is: b) 65 N

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The potential difference that stopped the electron is ΔV (to be calculated).

The initial kinetic energy of the electron is KE (to be calculated) in joules, which will be converted to electron volts (eV).

To determine the potential difference that stopped the electron, we can use the equation:

ΔV = -ΔE/q

where ΔV is the potential difference, ΔE is the change in electric potential energy, and q is the charge of the electron.

Since the electron is brought to rest, its initial kinetic energy is fully converted into electric potential energy.

The initial kinetic energy (KE) of the electron can be calculated using the equation:

KE = (1/2)mv²

where m is the mass of the electron and v is its initial speed.

The charge of the electron (q) is -1.6 x 10^(-19) C.

First, let's calculate the initial kinetic energy (KE) of the electron:

KE = (1/2)mv² = (1/2)(9.11 x 10^(-31) kg)(460,000 m/s)²

Next, let's calculate the potential difference (ΔV):

ΔV = -ΔE/q = -KE/q

Substituting the values into the equation, we have:

ΔV = -(KE/q) = -(KE/(-1.6 x 10^(-19) C))

Finally, we can convert the initial kinetic energy from joules to electron volts (eV) using the conversion factor 1 eV = 1.6 x 10^(-19) J.

The potential difference that stopped the electron is ΔV (to be calculated).

The initial kinetic energy of the electron is KE (to be calculated) in joules, which will be converted to electron volts (eV).

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Answer:

4a. –2.5 m/s²

4b. 375 m

5. 7.5 s

Explanation:

4. The following data were obtained from the question:

Initial velocity (u) = 50 m/s

Final velocity (v) = 25 m/s

Time (t) = 10 s

Acceleration (a) =?

Displacement (s) =?

4a. Determination of the acceleration of the car.

Initial velocity (u) = 50 m/s

Final velocity (v) = 25 m/s

Time (t) = 10 s

Acceleration (a) =?

a = (v – u) /t

a = (25 – 50)/10

a = –2.5 m/s²

The negative sign indicate that the car is decelerating.

4b. Determination of the displacement of the car.

Initial velocity (u) = 50 m/s

Final velocity (v) = 25 m/s

Time (t) = 10 s

Displacement (s) =?

s = (v + u)t / 2

s = (25 + 50) × 10 / 2

s = (75 × 10) / 2

s = 750 / 2

s = 375 m

Thus, the displacement of the car is 375 m

5. The following data were obtained from the question:

Initial velocity (u) = 30 m/s

Final velocity (v) = 0 m/s

Acceleration (a) = – 4m/s²

Time (t) =?

The time taken for the car to stop can be obtained as follow:

v = u + at

0 = 30 + (–4 × t)

O = 30 – 4t

Collect like terms

0 – 30 = –4t

–30 = –4t

Divide both side by –4

t = –30 / –4

t = 7.5 s

Thus, it will take 7.5 s for the car to completely stop.

The crust is composed of two basic rock types granite and basalt. The continental crust is composed mostly of granite. The oceanic crust consists of a volcanic lava rock called basalt. Basaltic rocks of the ocean plates are much denser and heavier than the granitic rock of the continental plates.

Answer:

Gravity.

Explanation:

Gravity is considered to be a universal force of attraction which acts between all objects that has both mass, energy and occupy space. Therefore, it acts in such a way as to bring objects together.

Additionally, the gravity of earth makes it possible for all physical objects to possess weight.

This ultimately implies that, this force is a pull between all objects. It is the force that gives us weight here on Earth. And, if we throw a rock off of a cliff, it is the force that causes the rock to fall to Earth.

Answer: ITS T

Explanation:

In a motor, electrical current enters through the brushes. TRUE.

The speed of the  Toyota Corolla would have  been 143.9 mph.

The acceleration of the F-15 can be calculated as follows:

Acceleration = Velocity Change / Time = (Take-off Speed) / Time

where;

Take-off Speed = √(2dg /t²)

Take-off Speed = √(2 x  (270 ft)  x 32.2 ft/s² / (2 s)²)

T  = √(17496) = 131.6 ft/s

Acceleration = Velocity Change / Time

= (131.6 ft/s) / (2 s) = 65.8 ft/s²

We can use the same acceleration to launch the Toyota Corolla, and calculate its final velocity:

Final Velocity = Initial Velocity + Acceleration x Time

where;

Final Velocity = 0 + (65.8 ft/s²) * (2 s) = 131.6 ft/s

Finally, we can convert the velocity from feet per second to miles per hour:

Velocity (mph) = Velocity (ft/s) x (1 hour/3600 s) x (5280 ft/mile)

= 131.6 ft/s x  (1 hour/3600 s)  x (5280 ft/mile)

= 143.9 mph

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Answer:

There is a thick layer of rubber coating on the wires.

Explanation:

This isn't just the case with birds, your headphones, if you notice closely have a layer of rubber coating as well, to protect you from accidentally touching the wires inside and hurting yourself.

Based on the first law of thermodynamics, the energy gained by a system is equal to the energy lost by the surroundings.

The laws of thermodynamics can be summarised as follow

From the laws given above precisely the first law, we can conclude that the energy gained by a system is equal to the energy lost by the surroundings

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The unit vector in the direction of v , then express v as a product of its length and direction: v=5 i+10 j+10 k is v = 15 * [(1/3)i + (2/3)j + (2/3)k].

To find a unit vector in the direction of vector v = 5i + 10j + 10k, we first need to calculate the length of vector v.

The length (magnitude) of a vector v = ⟨a, b, c⟩ can be calculated using the formula:

|v| = √(\(a^2 + b^2 + c^2\))

For vector v = 5i + 10j + 10k, the length is:

|v| = √(\(5^2 + 10^2 + 10^2\))

= √(25 + 100 + 100)

= √225

= 15

Now, to find a unit vector in the direction of v, we divide each component of vector v by its length:

u = (1/|v|) * v

Substituting the values:

u = (1/15) * (5i + 10j + 10k)

= (1/3)i + (2/3)j + (2/3)k

Therefore, a unit vector in the direction of v is u = (1/3)i + (2/3)j + (2/3)k.

To express vector v as a product of its length and direction, we can write:

v = |v| * u

Substituting the values:

v = 15 * [(1/3)i + (2/3)j + (2/3)k]

= 5i + 10j + 10k

Hence, vector v can be expressed as the product of its length and direction: v = 15 * [(1/3)i + (2/3)j + (2/3)k].

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Answer:

what table?

Explanation:

Answer:

-5

Explanation:

Quasars are extremely high energy galaxies believed to have formed in the early stages of the universe. They are not a conglomeration of spiral galaxies, white dwarfs that have undergone final collapse, or a conglomeration of pulsars within a galaxy.

Quasars are not a conglomeration of spiral galaxies or white dwarfs that have undergone final collapse. Instead, quasars are believed to be extremely high energy galaxies that formed in the early stages of the universe.

They are powered by supermassive black holes at their centers, which emit vast amounts of radiation and energy as they consume surrounding matter. Quasars are not a conglomeration of pulsars within a galaxy either. Rather, they are a distinct class of objects that are quite different from pulsars.

Quasars are a fascinating and mysterious type of object in the universe, and studying them can help us understand the early history of our cosmos in greater detail.

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Answer:

If it is a true mixture, the mixing enthalpy is negligible, and there is no reaction or phase change, then you can do this using exclusively the temperatures of the individual compounds and their heat capacities. Any other process that takes place needs to be taken into account separately.

The solution can be found by understanding that we’re only using state variables. You can design any complicated process that starts with the starting situation and ends up at the ending situation, and the state variables will be the same. And sometimes a complicated process is easier to calculate than the simple one-step process, like here when mixing multiple components.

One way that will work is to start by bringing all compounds to the lowest temperature of either of the compounds. All but one of the compounds must be cooled down for this; make sure to calculate for each of the components how much energy is released. Now, mix all the components together. In the simplest situation sketched above you can calculate the heat capacity of the mixture by adding all the heat capacities of the components. Use this total heat capacity to calculate how much you can heat up the mixture using the energy you saved in cooling down the components earlier. This will be your desired end situation.

In case there are any phase changes or other processes in between, you need to take the energy needed for those into account too but in very similar ways.

A ball is thrown vertically upward from the surface of the earth. both velocity and speed will become zero at highest point. so correct option is c. 1 and 2

Speed is a scalar quantity and velocity is a vector. Speed only determines the magnitude that is how fast is a body moving whereas velocity determines the direction also that is in which direction the body is moving. Speed is the rate of change of distance whereas velocity is the rate of change of displacement.

Velocity is a measure of how fast something moves in a particular direction. To define it needs both magnitude and direction.

At highest point acceleration is not zero because we have acc due to gravity acting downwards.But since velocity and speed is zero the ball reaches the ground back

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The spectral lines are spectra in which only a certain wavelength of light is emitted. spectrum can be observed from distant stellar objects.

The definite wavelength spectral lines can be observed from different elements.

Comparing definite wavelengths of emission spectra and spectra of distant stellar objects, we can determine the motion of the stellar body.

If the body is moving, then the Doppler effect plays an effective role by altering the wavelengths of the emission spectra.

Two cases will take place:

First: If the body is moving away, then the wavelength of emission spectra will shift toward red.

Second: If the body is moving towards, then the wavelength of emission spectra will shift toward the blue end.

This phenomenon is only observed in the case of radial movement of the body.

In the case of tangential motion, the Doppler effect won't play a role. so we observe no change in spectral lines.

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Astigmatism is due to irregular shape of eyeball which is corrected by using cylindrical lens so if we rotate the cylindrical lens it will effect the image.

Due to rotational asymmetry in the eye's refractive power, astigmatism is a form of refractive error. Any distance vision becomes warped or obscured as a result. Other signs might include headaches, eyestrain, and difficulty driving at night. Often present at birth, astigmatism can later develop or change. It may lead to amblyopia if it develops early in infancy and is untreated.

Although the exact cause of astigmatism is unknown, it is thought to have some genetic components. The cornea's uneven curvature and lens astigmatism, a defensive response alteration in the eye's lens that shares the same process as an accommodation spasm, make up the underlying mechanism. Autorefractor keratometry, an objective eye test that shows the astigmatism in the lens and cornea, and subjective refraction are used to make the diagnosis. However, if lens astigmatism is not fully removed first with a week of eye drops, subjective methods are almost always inaccurate.

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