Two wires cross, one carrying current to the east and the other to the north. The force between the two wires is_____ O repulsive. Ozero. O attractive.

A dieter lifting a 10 kg mass 1000 times to a height of 0.5m each time does 49.05 J of work per lift, resulting in the total amount of work done and fat burned is calculated by total amount of energy.

(a) The amount of work done against the gravitational force is calculated by using the formula:

W = m*g*h

where m is the mass,

g is the acceleration due to gravity, and

h is the height.

The person lifts a 10 kg mass to a height of 0.5 meters, so the work done each time is:

[tex]W = (10 kg) * (9.8 m/s^2) * (0.5 m) = 49 Joules.[/tex]

The total work done against the gravitational force is:

[tex]W_{total}= (49 J) * (1000) = 49,000 J.[/tex]

(b) To calculate the amount of fat burned, we need to find the total amount of energy expended and divide it by the efficiency rate and the energy per kilogram of fat.

The total amount of energy expended by the person is:

[tex]E_{total} = W_{total} = 49,000 J.[/tex]

The efficiency rate is 20%, which means that 20% of the expended energy is converted to mechanical energy.

The energy per kilogram of fat is [tex]3.8*10^7[/tex] Joules/kg.

Therefore, the amount of fat burned is:

Fat burned = [tex]E_{total}[/tex] / (efficiency rate * energy per kg of fat)

Fat burned = 49,000 J / (0.2 * 3.8 x 10⁷ J/kg)

Fat burned = 0.0645 kg of fat (or 64.5 grams of fat).

So, the person will burn approximately 64.5 grams of fat by lifting a 10 kg mass 1000 times to a height of 0.5 meters each time.

Also the total work done against gravitational force is 49,000J.

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Mars has a mass of about 0.1075 times the mass of earth and a diameter of about 0.533 times the diameter of earth.The acceleration of a body falling near the surface of Mars is about 3.7 m/s².

Given, Mars has a mass of about 0.1075 times the mass of Earth and a diameter of about 0.533 times the diameter of Earth.

To find the acceleration of a body falling near the surface of Mars, we can use the formula:

g = GM/r²

where: g = acceleration due to gravity on Mars

M = mass of Mars

r = radius of Mars

We know that mass is proportional to the cube of the radius. So we can say:

Mars/Mass of Earth = (radius of Mars / radius of Earth)³0.1075M/ME

                                = (0.533RE/RE)³0.1075

                                = 0.01514ME

Simplifying this equation, we can say:

M = 0.1075 × MEr = 0.533 × RE

Now, let's calculate the acceleration due to gravity on Mars:

g = GM/r²g

  = (6.674 × 10⁻¹¹) × (0.1075 × ME) / (0.533 × RE)²g

  = 3.7 m/s².

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Since both coconuts fall the same distance, they will reach the ground with the same speed (v). The speed of the coconut from the other tree when it reaches the ground is equal to the speed of the coconut from the taller tree (v).

The speed of the coconut from the other tree when it reaches the ground is equal to the speed of the coconut from the taller tree (v). This is because the force of gravity is the same on both coconuts and they experience the same acceleration. This means that they will reach the ground with the same speed, regardless of the height of the tree they are falling from.
The gravitational acceleration (g) is a constant and is independent of the mass of the coconut. Since both coconuts have the same mass, they will experience the same force of gravity, resulting in the same acceleration. This acceleration is independent of the initial height of the coconut, meaning that the coconuts will reach the ground with the same speed regardless of their initial height.
The speed (v) of the coconuts when they reach the ground is determined by their initial speed at the top of the tree (v0) and the distance they fall (d). If the initial speed is 0 (which is the case when the coconut is released from rest) then the final speed is determined by the distance the coconut has fallen (d). According to the equation v2 = 2gx, v = sqrt(2gd), where g is the gravitational acceleration and d is the distance fallen. Therefore, since both coconuts fall the same distance, they will reach the ground with the same speed (v).

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The proper order of structures through which light must pass in order to perceive and image is cornea, aqueous humor, lens, vitreous humor, retina.

These are the five main structures of the human eye that enable vision, including light perception and imaging. Let's delve into each of these structures.

Cornea: The clear, protective outer layer of the eye is the cornea. The cornea has two purposes: to shield the inner eye from harm and to help focus light on the retina at the back of the eye.

The cornea's curved shape bends light waves as they enter the eye, assisting in their concentration.

Aqueous humor: This is a liquid that flows throughout the front of the eye, nourishing and removing waste from its surrounding tissues.

It aids in the maintenance of normal eye pressure, and if this pressure becomes too high, it can lead to glaucoma.

Lens: The lens' job is to concentrate light onto the retina. It's a transparent structure with a biconvex (lens-like) shape that varies in thickness.

It is supported by ciliary muscles that allow it to alter shape when we focus on things at different distances.

Vitreous humor: This gel-like substance fills the eye's posterior (rear) cavity, providing it with structural stability and helping it to maintain its form. It also assists in light refraction.

Retina: This is a thin layer of tissue lining the rear of the eye. The retina's photoreceptor cells, or rods and cones, are sensitive to light.

The retina converts light energy into neural signals that are transmitted to the brain via the optic nerve, which is located behind the eye. The brain translates these signals into images, allowing us to see.

What we see when we open our eyes is formed by light. In order to perceive an image, light must pass through a series of structures in the eye.

The cornea, aqueous humor, lens, vitreous humor, and retina are the five main structures of the human eye that enable vision, including light perception and imaging.

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The final speed of the composite object is 0.8 m/s.

We can use the law of conservation of momentum, which states that the total momentum of a closed system remains constant. In this case, the initial momentum of the system is,

initial momentum = (50 kg) x (-5 m/s) + (70 kg) x (5 m/s)

= -250 kg m/s + 350 kg m/s

= 100 kg m/s

Since the carts stick together after the collision, their masses add up to give the mass of the final composite object,

mass of final object = 50 kg + 70 kg

= 120 kg

Using the conservation of momentum, we can solve for the final velocity of the composite object,

initial momentum = final momentum

100 kg m/s = (120 kg) x (v) m/s

Solving for v,

v = 0.83 m/s

Rounding off to one significant figure, velocity is, 0.8 m/s.

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Tom's 4-inch refracting telescope has a higher resolving power.

Refracting telescopes have higher resolving power than reflecting telescopes, as the size of the objective lens in a refractor can be larger than the size of the mirror in a reflector.

Resolving power is the ability of a telescope to distinguish between two closely spaced objects. It is determined by the diameter of the telescope's objective lens or mirror. The resolving power is proportional to the diameter of the objective, so a larger objective will have a higher resolving power.

Therefore, Tom's 4-inch refracting telescope has a higher resolving power than Steve's 3-inch reflecting telescope.


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A decrease in charge, q, will result in a decrease in the electric field strength. The ratio of the final to initial field strengths can be expressed as qf/qi. If q is halved, the ratio would be 0.5. If the radius, r, is halved, the ratio would be 1/2r2i/r2i, which is equal to 0.25. If r is halved, but the distance remains the same, the ratio would be 1/2r2i/r2i, which is equal to 0.25.

The electric field strength is inversely proportional to the distance from the charge, and directly proportional to the charge and the radius of the sphere. Therefore, halving the charge or radius will result in a decrease in the electric field strength. Halving the radius, with the distance remaining the same, will result in the same ratio as halving the charge because the distance will be the same in both cases.

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The correct option is C, The period of oscillation should be proportional to A^-1 square root of m/k.

mass m, with dimensions of M

force constant k with dimensions of ML^-2T^-2

amplitude A, with dimensions of L

To find the relation for period of oscillation with dimension T

To get the dimension T from m,k and A

[tex]1/A*\sqrt{(m/k)} = 1/L*\sqrt{(M/ML^{-2}T^{-2}) }= 1/L*LT = T[/tex]

Oscillation refers to the repetitive variation of a physical quantity around a central value or equilibrium position. It is a common phenomenon in many natural and man-made systems, ringing from simple pendulums and springs to complex electrical circuits and biological processes.

In an oscillating system, the physical quantity, such as displacement, velocity, or current, continuously changes between maximum and minimum values with a fixed frequency and amplitude. The frequency of oscillation is the number of cycles per unit time, usually measured in Hertz (Hz), while the amplitude is the maximum deviation from the equilibrium position. Oscillations can be periodic, where the motion repeats itself exactly over a fixed time interval, or non-periodic, where the motion is irregular and unpredictable.

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Complete Question: -

The period of oscillation of a nonlinear oscillator depends on the mass m, with dimensions of M; a restoring force constant k with dimensions of ML^-2T^-2 and the amplitude A, with dimensions of L. Dimensional analysis shows that the period of oscillation should be proportional to

a) A square root of m/k b) A^2 m/k c) A^-1 square root of m/k d) (A^2k^3)/m

If there is no change in the charge distributions, the direction of the net electrostatic force on an electron located at the center of the circle would be zero.

The electric field is a force that acts on a charged particle in an electric field. The electric field exerts a force on a charged particle that is proportional to the charge on the particle and the strength of the electric field.The force is exerted in the direction of the electric field. If an electron is placed in the electric field, it will experience a force in the opposite direction to the electric field.

When a charged particle is placed in a uniform electric field, the net electrostatic force on the particle is zero, as the direction of the force is opposite to the direction of the electric field.This can be understood through the principle of superposition. Since there is no change in the charge distribution, the electric field at the center of the circle will be zero. Therefore, the net electrostatic force on an electron located at the center of the circle will be zero.

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The image size on the retina of a person of height 1.8 m standing 8.0 m away is: 0.094 cm.

The size of the image on the retina of a person of height 1.8 m standing 8.0 m away is determined by the size of the object, the distance between the object and the lens, and the distance between the lens and the retina.

The image size on the retina is inversely proportional to the distance between the object and the lens and is directly proportional to the distance between the lens and the retina. In this case, the object is 1.8 m away and the lens is 1.7 cm from the retina.

Therefore, the image size on the retina is (1.7 cm/1.8 m) times 8.0 m, or 0.094 cm. This means that the image size on the retina of a person of height 1.8 m standing 8.0 m away is 0.094 cm.

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The wind direction, speed, and temperature that a pilot should expect when planning for a flight over EMI at FL 270 are as follows:

Wind direction: 240 degrees True

Wind speed: 25 knots

Temperature: -10 degrees Celsius

EMI is a waypoint in the North Atlantic Track System, located in the middle of the ocean. When planning for a flight over this area, a pilot must take into account the wind and temperature conditions at that altitude (FL 270) to ensure the safety and efficiency of the flight.

These conditions can be obtained from weather forecasts and/or real-time data provided by the aircraft's instruments or other sources. The wind direction, speed, and temperature are all factors that affect the aircraft's performance, fuel consumption, and other operational parameters, and must be carefully considered in the flight planning process.


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Magnitude of the acceleration of fan blades will be approximately 165.9 m/s2

The first step is to convert the rotational speed from revolutions per minute (RPM) to radians per second (rad/s), since acceleration is measured in meters per second squared (m/s^2), which is a linear unit of measurement. We can use the conversion factor:

1 revolution = 2π radians

Therefore, 339.0 rev/min is equal to:

339.0 rev/min * (2π rad/1 rev) * (1 min/60 s) = 35.6 rad/s

The acceleration of a point on one of the fan blades can be found using the formula for centripetal acceleration:

a = rω^2

where:

a is the centripetal acceleration

r is the radius of the fan blade (0.13 m)

ω is the angular velocity in radians per second (35.6 rad/s)

Plugging in the values:

a = (0.13 m)(35.6 rad/s)^2

a = 165.9 m/s^2 (rounded to three significant figures)

Therefore, the magnitude of the acceleration of a point on one of the fan blades is 165.9 m/s^2.

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According to the information, the speed increases up to 2,900 kilometers deep and then drops because the pressure is higher.

According to the information of the points we can infer that the speed gradually increases up to 2900 km depth. Once it exceeds this depth, it falls radically to 8.5 km/s (a little higher than the initial speed).

Its speed decreases radically because it exceeds the depth of 2900 km where the pressure is greatest.

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A 5 kg toy train car is connected to a 3 kg toy train car. the 3 kg car is given an external force of 16 n. the tension in the rope connecting the two cars is 29 N.

The tension in the rope connecting two toy train cars A toy train car with a mass of 5 kg is connected to a toy train car with a mass of 3 kg. An external force of 16 N is applied to the 3 kg car.

Tension in the rope between the two toy cars is what we need to calculate. According to Newton’s 2nd law, force equals mass multiplied by acceleration. If the two cars are moving in the same direction with the same acceleration, the tension in the rope can be calculated as follows:

Force acting on the two cars is the external force that is applied on the 3 kg car which is equal to 16 N. In this case, both cars will have the same acceleration.

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Explanation:

The option that best describes the image when an object is placed at a distance greater than twice the focal length in front of a concave mirror is:

"An inverted image which is smaller than the object and located between the focal point and the center of curvature of the mirror.

"When an object is placed at a distance greater than twice the focal length in front of a concave mirror, a virtual, upright, and magnified image is formed.

As per the rules of concave mirrors, when an object is placed beyond the center of curvature, an inverted and real image is produced.

As a result, option (A) is incorrect.

When the object is placed at the center of curvature, the size of the image is equal to that of the object, and it is inverted.

As a result, option (C) is incorrect.

When an object is placed at a distance that is less than twice the focal length, the image formed is virtual, erect, and magnified.

As a result, option (D) is incorrect.

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The point at which the kinetic energy is lowest is 3 in the syringe containing an incompressible fluid that is vertically oriented and the plunger is slowly depressed.

The kinetic energy of an object is the energy it has due to its motion. When an object is in motion, it has kinetic energy. It is a scalar quantity that is proportional to the mass of the object and the square of its velocity. The formula for kinetic energy is given as follows:

                                KE = 1/2mv²

Where m is the mass of the object and v is its velocity.

Points 1 and 2 have higher kinetic energy because the incompressible fluid is still being compressed in the syringe. Point D is incorrect because the kinetic energy of the incompressible fluid is not the same at all three points. Point E is incorrect because enough information has been provided. Therefore, when a syringe containing an incompressible fluid is vertically oriented and the plunger is slowly depressed, the kinetic energy is lowest at point 3.

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The force generated per unit field strength on a 20.0 cm wide section of the loop with a current of 5.5 A is: 0.001 newtons per tesla

The force generated per unit field strength on a 20.0 cm wide section of the loop with a current of 5.5 A is given by the formula F = (μI) / 2πr,

where μ is the permeability of free space, (4π x 10-7 N/A²)

I is current, and r is the radius of the loop.

In this case, the force is (4π x 10-7 x 5.5) / (2π x 0.1) = 0.001 N/T.

In other words, the force generated per unit field strength on a 20.0 cm wide section of the loop with a current of 5.5 A is 0.001 newtons per tesla.

The formula for the force generated per unit field strength on a loop is derived from the fact that the force is a result of the magnetic field generated by the current flowing in the loop.

The magnitude of the magnetic field generated is proportional to the current and inversely proportional to the radius of the loop. Since the force is a product of the current and the magnetic field, it is proportional to the square of the current and inversely proportional to the square of the radius of the loop.

In summary, the force generated per unit field strength on a 20.0 cm wide section of the loop with a current of 5.5 A is 0.001 newtons per tesla, given by the formula F = (μI) / 2πr, where μ is the permeability of free space (4π x 10-7 N/A²), I is current, and r is the radius of the loop.

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The work done by the tension force on Magnus is 2170 J.

What is work?

Work is the product of the force acting on an object and the distance through which the object moves. In other words, work is accomplished when a force is used to transfer energy to an object, causing the object to move some distance as a result.

The force of 1400 N, Distance of 1.55 meters, and a rope tied around Magnus's waist.

The work done by the tension force on Magnus is the product of the force exerted by the tension force and the distance through which Magnus is moved.

W = Fd

where W = Work done by the tension force on Magnus

F = Force of tension force

  = 1400 Nd

  = Distance moved by Magnus

  = 1.55 m

Substituting these values:

W = 1400 N x 1.55 mW

   = 2170 J

Hence, the work done by the tension force on Magnus is 2170 J.

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The velocity at impact will be (-10) m/s if all forces acting on the spacecraft (weight, drag, and thrust) are included.

To find the velocity at impact, first, we need to consider all the forces acting on the spacecraft (weight, drag, and thrust). Then, we can use these forces to find the net force and acceleration. Finally, we can calculate the impact velocity.

Step 1: Calculate the weight of the spacecraft:-
Weight = mass × gravitational acceleration
Weight = 2060 kg × 3.7 m/s² = 7618 N

Step 2: Calculate the net force acting on the spacecraft:-
Net force = thrust - drag - weight
Net force = 4810 N - 7500 N - 7618 N = -10308 N

Step 3: Calculate the acceleration of the spacecraft:-
Acceleration = net force/mass
Acceleration = -10308 N / 2060 kg = -5 m/s²

Step 4: Calculate the velocity at impact:-
We know that the initial velocity is 40 m/s, and the propellant burns for 10 seconds. We can use the equation of motion (v = u + at) to find the final velocity:-
Final velocity(v) = initial velocity(u) + acceleration(a) × time(t)
Final velocity = 40 m/s + (-5 m/s²) × 10 s = 40 m/s - 50 m/s = -10 m/s

Therefore, the velocity at impact will be -10 m/s (the negative sign indicates that the velocity is in the opposite direction to the initial velocity).

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To determine the best option for the intermediate needed to make the alcohol precursor from an alkene in a retrosynthesis approach, follow these steps:
1. Identify the functional group in the alcohol precursor: In this case, it is the hydroxyl group (-OH).
2. Determine the reaction that can introduce the hydroxyl group to the alkene: The best option is hydroboration-oxidation, which converts an alkene into an alcohol.
3. Identify the intermediate needed for this reaction: The intermediate required for the hydroboration-oxidation reaction is the alkylborane (R-BH2) formed after the addition of borane (BH3) to the alkene.

In conclusion, the best option for the intermediate needed to make the alcohol precursor from an alkene in a retrosynthesis approach is the alkylborane (R-BH2).

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The magnetic field strength is 86mT and if the maximum diameter of the electron orbit before the electron hits the wall of the tube is 2.5 cm, then the maximum electron kinetic energy is 1.6 x 10^(-14) J.

a. To determine the magnetic field strength, we can use the equation for the electron cyclotron frequency:

f = (eB)/(2πm),

where e is the charge of the electron (1.6 x 10^-19 C),

m is the mass of the electron (9.11 x 10^-31 kg), and

f is the frequency (2.4 GHz).

First, convert the frequency to Hz:

2.4 GHz = 2.4 x 10^9 Hz.

Next, rearrange the equation to solve for B:

B = (2πmf)/e

Finally, plug in the values and calculate B:

B = (2π * (9.11 x 10^-31 kg) * (2.4 x 10^9 Hz))/(1.6 x 10^-19 C)

B = 86mT

So, the magnetic field strength is 86mT.

b. To find the maximum electron kinetic energy, we first need to determine the maximum electron velocity, using the maximum diameter of the electron orbit (2.5 cm) and the cyclotron frequency.

The circumference of the orbit is

C = πd

= π * (2.5 x 10^-2 m).

The time for one orbit is

T = 1/f

= 1/(2.4 x 10^9 Hz).

Now, find the electron's maximum velocity:

v = C/T

= (π * (2.5 x 10^-2 m))/(1/(2.4 x 10^9 Hz))

= 1.884 x 10^8 m/s.

Finally, use the equation for kinetic energy to find the maximum electron kinetic energy:

K = 0.5mv^2

= 0.5 * (9.11 x 10^-31 kg) * (1.884 x 10^8 m/s)^2

= 1.6 x 10^-14 J.

So, the maximum electron kinetic energy is 1.6 x 10^-14 J.

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The primary source of energy for most terrestrial ecosystems is the sun.

This is because the sun provides energy in the form of sunlight, which is used by plants and other autotrophs to carry out photosynthesis. During photosynthesis, plants convert sunlight into chemical energy in the form of glucose, which is used as a source of energy for the plant's growth and metabolism.

Other organisms in the ecosystem, such as herbivores and carnivores, rely on plants for their energy needs. Herbivores consume plant material, while carnivores consume other animals. In both cases, the energy that these organisms obtain ultimately comes from the sun, as it is the energy source that powers the plant growth and photosynthesis.

There are some exceptions to this general pattern, such as deep-sea ecosystems that rely on chemosynthesis instead of photosynthesis. However, in most terrestrial ecosystems, the sun is the primary source of energy that supports the growth and survival of the ecosystem's organisms.

In summary, the sun is the primary source of energy for most terrestrial ecosystems, providing the energy needed for plant growth and photosynthesis, which in turn supports the growth and survival of other organisms in the ecosystem.

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The Maxwell equation ∇ × E = -∂B/∂t can be used to predict the magnetic field in a region of space in which the electric flux is changing.

The Maxwell equation ∇ × E = -∂B/∂t is one of the four Maxwell equations that describe the behavior of electric and magnetic fields. It relates the curl of the electric field to the time rate of change of the magnetic field. In other words, it describes how a changing electric field creates a magnetic field.

This equation is important in the study of electromagnetic waves, which are generated by changing electric and magnetic fields. When an electric field changes in time, it creates a magnetic field, which then creates an electric field, and so on, creating a self-sustaining wave.

The equation can be used to predict the behavior of electromagnetic waves in space, as well as the behavior of electric and magnetic fields in the presence of each other.

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The charge on each sphere after they are separated is [tex]4.71 × 10^-7 C.[/tex]

The initial electrostatic force between the two spheres before they come in contact is given by Coulomb's law:

[tex]F = k(q1)(q2) / r^2[/tex]

where F is the electrostatic force, k is Coulomb's constant (9 × [tex]10^9[/tex] [tex]N·m^2/C^2)[/tex], q1 and q2 are the charges on the spheres, and r is the distance between them.

Since the two spheres are identical, we can assume that they have the same charge q before they come in contact. Therefore, we can rewrite Coulomb's law as:

[tex]F = kq^2 / r^2[/tex]

After the spheres come in contact and then are separated again, their charges are redistributed. Since the spheres have the same charge initially and they are identical, we can assume that they now have equal charges q'. The final electrostatic force between the spheres is also given by Coulomb's law:

[tex]F' = k(q')^2 / r^2[/tex]

We know that the final force is 0.1 N, and the initial distance between the spheres is 45 m. We can use these values to find the initial charge q:

[tex]0.1 N = kq^2 / (45 m)^2[/tex]

[tex]q^2 = (0.1 N)(45 m)^2 / k[/tex]

[tex]q = sqrt[(0.1 N)(45 m)^2 / k][/tex]

Substituting the values, we get:

q = 6.67 × 10^-7 C

Now that we know the initial charge q, we can use Coulomb's law to find the final charge q':

[tex]0.1 N = k(q')^2 / (45 m)^2[/tex]

[tex]q' = sqrt[(0.1 N)(45 m)^2 / k][/tex]

Substituting the values, we get:

q' = 4.71 × 10^-7 C

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Through the coil, the magnetic flux rises. The coil will experience a voltage as a result. This voltage will cause a current to flow. The amount of the emf increases with speed and is 0 in the absence of motion.

A current will be induced in a coil of wire if it is exposed to a shifting magnetic field. Because of an electric field that is being generated, which drives the charges to move around the wire, current is flowing.

Self-Inductance: When current passes through a coil, a magnetic field and consequent magnetic flux are created.

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The net work on the ball if its velocity changes to (8i 4.00j)m/s is 27.60 Joules.

Using the work-energy principle, we know that the net work done on the ball is equal to the change in its kinetic energy.

To find the change in kinetic energy, we need to calculate the ball's final velocity and its initial velocity, and then use the formula:

Change in Kinetic Energy = (1/2) x mass x (final velocity)² - (1/2) x mass x (initial velocity)²

The net work done on the ball is 27.60 Joules.

So, when the ball changes its velocity from (6.60i-2.40j) m/s to (8i+4.00j) m/s, the net work done on it is 27.60 Joules.

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The star that has an apparent magnitude of -26.7 and an absolute magnitude of 4.8 would be located in the milky way galaxy, in the local group. The name of this star would be considered a supergiant

The apparent magnitude of a star is the brightness of the star as seen from Earth, while the absolute magnitude is the brightness of a star if it were located at a distance of 10 parsecs (32.6 light-years) from the Earth. The brightness or luminosity of a star determines where it is located. Stars that are more massive and luminous than the sun would be found in star clusters or in the spiral arms of the galaxy. On the other hand, stars that are less massive than the sun are typically found in the galaxy's central bulge or halo.

The distance to the star can be determined from the apparent and absolute magnitudes, using the formula:d = 10^((m-M+5)/5),where d is the distance in parsecs, m is the apparent magnitude, and M is the absolute magnitude. Substituting the values given in the question:d = 10^((-26.7-4.8+5)/5) = 10^(-26/5) = 2.51 x 10^(-6) parsecsThe distance calculated is extremely small (less than a thousandth of a light-year), so the star would be located within our Milky Way galaxy. As the star has a high luminosity, it would be considered a supergiant, so it would be visible from Earth.

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The current in the solenoid becomes 3.56 A.

How to find current in the solenoid?

Number of turns in the solenoid, n = 100 turns/cm

Radius of the circular path of electron, r = 2.30 cm

Speed of electron, v = 0.0460c, where c is the speed of light

To find: Current in the solenoid, i

Formula used: Magnetic field inside the solenoid,

B = μ0ni Where, μ0 = 4π × 10⁻⁷ T m/A is the permeability of free spaceSolution:

The force on a moving electron in a magnetic field is given by

F = Bev

Where B is the magnetic field, e is the charge of an electron and v is its velocity.

The force acting on the electron provides the necessary centripetal force for the electron to move in a circle of radius r.

So,

Bev = (mev²)/r

where me is the mass of an electron

On simplifying the above equation, we get

Be = (mev)/r

Put the value of B from the formula of magnetic field inside the solenoid, B = μ0ni

we get

μ0ni = (mev)/r

Solve for i,

i = (mev)/(μ0nr)

Substitute the given values and solve

i = (9.109 × 10⁻³¹ kg × 0.0460c × 3 × 10⁸ m/s)/(4π × 10⁻⁷ T m/A × 100 turns/cm × 2.30 cm)i

= 3.56 A

Therefore, the current in the solenoid is 3.56 A.

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The moment of inertia of the wheel is gotten to be I = 41.2 kg.m²

Angular displacement = 5.55 revolutions × 2π radians/revolution

Angular displacement = 34.9 radians

Angular acceleration:

Angular acceleration = (final angular velocity - initial angular velocity) / time

Angular acceleration = (88.8 rad/sec - 0 rad/sec) / 0 s

Angular acceleration = 88.8 rad/sec²

Moment of inertia.

Moment of inertia = (torque × angular displacement) / angular acceleration

Moment of inertia = (77.7 Nm × 34.9 radians) / 88.8 rad/sec²

Moment of inertia = 41.2 kg.m²

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