the north pole of a bar magnet is moved close to the north pole of another bar magnet that is suspended by a thread. how does the energy stored in the magnetic field change?

Answer:

The relative density of the liquid is 1.5

Explanation:

The relative density of a liquid is defined as the ratio of the density of the liquid to the density of water. We can use the principle of buoyancy to find the relative density of the liquid.

When the body is immersed in water, it experiences an upthrust equal to the weight of water displaced. Therefore, the weight of water displaced = weight of the body in air - weight of the body in water = 0.5 kg - 0.3 kg = 0.2 kg.

Similarly, when the body is immersed in the liquid, it experiences an upthrust equal to the weight of liquid displaced. Therefore, the weight of liquid displaced = weight of the body in air - weight of the body in the liquid = 0.5 kg - 0.2 kg = 0.3 kg.

The relative density of the liquid can be found as follows,

Relative density of liquid = Density of liquid / Density of water

= (Weight of liquid displaced / Volume of liquid) / (Weight of water displaced / Volume of water)

= (0.3 kg / Volume of liquid) / (0.2 kg / Volume of water)

= (0.3 kg / Volume of liquid) / (0.2 kg / 0.2 L) [since the density of water is 1 g/mL or 1 kg/L]

= 1.5 / Volume of liquid

Therefore, the relative density of the liquid is 1.5 divided by the volume of the liquid in liters.

The first-order maximum for 450-nm wavelength blue light falling on double slits separated by 0.0500 mm is approximately 6.2°.

The angle of the first-order maximum refers to the angle at which the brightest interference pattern appears on a screen placed behind two closely spaced slits when illuminated with the blue light of 450-nm wavelength.

The angle is determined by the equation:

theta_m = (m*lambda)/d

where m is the order, lambda is the wavelength, and d is the slit separation.
theta_m = (1*450E-9 m)/0.0500 mm
theta_m = 6.2°

Thus, the first-order maximum for double slits of 0.0500 mm at 450 nm λ blue light is around 6.2°.

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The time taken by both balls to be at the same height is 1.02 seconds.

The time taken by two balls to be at the same heightGiven,Initial speed of the ball that is thrown upward from the ground, u = 35 m/s,Initial height of the ball that is dropped from a building, h = 5.0 m,Finding out the time taken by both balls to be at the same height,Time taken by ball that is thrown upward from the ground, t = ?

For the first ball (that is thrown upward from the ground), the acceleration, a = -9.8 m/s² (negative because it's going against the gravity).Using the formula of motion,S = ut + 1/2 at²where,S = height of the ball above the ground, t = time taken by the ball to reach that height, and u = initial speed of the ball that is thrown upward from the ground.

Here, h = S and u = 35 m/s, and a = -9.8 m/s². Then putting the values we get,h = ut + 1/2 at²5 = (35)t + 1/2 (-9.8)t²5 = 35t - 4.9t²----------------(1)Also, for the second ball (that is dropped from a building), the time taken to reach the ground can be found using the formula, h = 1/2gt². Here, h = 5.0 m.

Therefore,5 = 1/2 × (-9.8) × t²5 = -4.9t²t² = -5/-4.9t² = 1.02t = √1.02

Therefore, the time taken by both balls to be at the same height is 1.02 seconds.

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The intensity of sound at the busy sound corner is 3.162 × 10⁻² W/m².

The sound intensity, represented by I, is defined as the power conveyed by a sound wave per unit area. Watts per square metre (W/m2) are the units of measurement.

waves are a type of energy propagation through a medium by means of adiabatic  lading and unloading. Important amounts for describing  aural  swells are  aural pressure,  flyspeck  haste,  flyspeck  relegation and  aural intensity.

The formula for determining sound intensity from decibel level is as follows:

I = I₀ × 10^(L/10)

where I0 is the reference intensity and L is the decibel level.

Plugging in the values from the issue yields:

I = (1×10⁻¹² W/m²) × 10^(75/10) = 3.162 × 10⁻² W/m²

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Answer:

The type of pressure that prevents a white dwarf from collapsing is the electron degeneracy pressure.

A white dwarf is a stellar remnant of a low or medium-mass star that has died, formed by a white dwarf supernova.

How does a white dwarf stay stable?

The white dwarf's stability is maintained by electron degeneracy pressure, which is the result of electrons being packed so tightly in the star's core that they are forced to behave like a gas, rather than a collection of individual particles.

The quantum mechanical Pauli exclusion principle governs the behavior of these electrons, which prohibits two fermions from occupying the same quantum state at the same time.

As a result, each electron is forced into a higher-energy state, resulting in a pressure that resists gravitational compression.

Therefore, the type of pressure that prevents a white dwarf from collapsing is the electron degeneracy pressure.

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The focal length of the mirror is  8.57 cm.

The focal length is the distance between the mirror and the focal point.

For a convex lens the focal point is that point at which parallel rays will be focused after passing thru the lens.

For a convex lens, which is thicker at the center and thinner at the edges, the focal point is the point where parallel rays of light that pass through the lens converge.

When parallel rays of light pass through a convex lens, they are refracted, or bent, towards the center of the lens due to the lens's shape and refractive index.

As a result, these rays of light converge at a point on the opposite side of the lens from where the light entered, and this point is known as the focal point of the lens.

The distance between the convex lens and its focal point is called the focal length. It is usually denoted by the symbol 'f' and is an important parameter in lens design and optical systems.

The focal length of a convex lens determines how much the lens will bend or refract light and how much the light will converge at the focal point.

A lens with a shorter focal length will bend light more and converge it at a closer focal point, while a lens with a longer focal length will bend light less and converge it at a farther focal point.

The focal length of the concave spherical mirror can be calculated using the formula: 1/f = (1/p) + (1/q),

where p is the distance from the object to the mirror (13.2 cm) and q is the distance from the image to the mirror (14.0 cm).

Therefore, the focal length of the mirror is 8.57 cm.

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The time at which the centripetal and tangential accelerations of a point on the rim have the same magnitude is given by t = √(R/α).

A tangential = R, where R is the wheel's radius and is the angular acceleration, gives the tangential acceleration of a point on the rim of the wheel.

A centripetal =  v²/R, where v is the speed of the point, gives the centripetal acceleration of a point on the rim of the wheel.

At time t, the wheel's angular displacement is given by  = (1/2)t2, and the speed of the point on the rim is given by v = R, where is the wheel's angular velocity.

Setting the magnitudes of the tangential and centripetal accelerations equal, we have:

Rα = v²/R

Substituting v = Rω and simplifying, we get:

Rα = Rω²

α = ω²

Using the definition of angular velocity ω = αt, we get:

t = √(R/α)

Therefore, the time at which the centripetal and tangential accelerations of a point on the rim have the same magnitude is given by t = √(R/α).

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The number of electrons per second that enter the positive end of a battery can be calculated by the current flowing through the circuit and the time for which it flows.

Therefore, The formula of current is as

I = Q/t

where I is the current,

Q is the charge passing through the circuit, and

t is the time for which the current flows.

Since one electron carries a charge of -1.6 x 10⁻¹⁹Coulombs, we can calculate the number of electrons passing through the circuit using the following formula:

n = Q/e

where n is the number of electrons and

e is the charge on an electron (-1.6 x 10⁻¹⁹ Coulombs).

If we know the current flowing through the circuit and the time for which it flows, we can calculate the number of electrons per second using the following formula:

n/s = I/e

where n/s is the number of electrons per second.

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The amount of tension a rope must withstand if it is used to accelerate a 1410 kg car horizontally along a frictionless surface at 1.40 m/s² is 1974 N.

Tension is the force that stretches or pulls something tightly. In physics, the term "tension" refers to the force that is transmitted through a string, cable, chain, or wire when it is pulled taut by forces acting on either end. The acceleration of the car is given as 1.40 m/s². This means that the force required to move the car is given as F = m × a. Where, F = force acting on the car M = mass of the car = 1410 kg.a = acceleration = 1.40 m/s²Therefore, F = 1410 × 1.40= 1974 N. The rope or cable used to pull the car must generate enough force to overcome the weight of the car and move it forward. The force of tension in the rope or cable required to move the car at the given acceleration is Ft = F= 1974 N.

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Visible Infrared (IR) satellite channels measure the temperature of underlying surfaces. This includes clouds, oceans, and land.

IR channels work by detecting the amount of infrared radiation emitted from the Earth's surface. The intensity of the radiation is then converted into a digital number, which is displayed as a color on a satellite image. The higher the digital number, the warmer the surface temperature. This data can then be used to track changes in temperatures over time. The satellite channel that measures the temperature of the underlying surfaces is visible infrared. The surface temperature measurement is made possible by the difference in temperatures of objects in the infrared spectrum. An object's temperature and the level of radiation it emits have a direct correlation, and this is what visible infrared satellites use to take the temperature of the underlying surfaces. The visible infrared (VI) channel is used to estimate cloud cover and surface temperature. Infrared radiation from the surface of the earth is detected in this channel. The temperature of clouds, oceans, and land can be estimated using the visible infrared (VI) channel. It also provides data on how temperature changes with latitude and over time. Furthermore, the VI channel aids in the identification of cold and hot surfaces. Water vapor (WV) is another channel utilized in satellite imagery to observe the atmosphere's water vapor content. It enables meteorologists to forecast the occurrence of rainfall and other weather patterns. In general, satellite measurements assist in understanding Earth's weather and its impact on humans and the environment. These satellites help scientists to forecast severe weather, monitor weather changes over time, and analyze natural disasters. In addition, they assist in tracking the effects of climate change on the planet.

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The launch angle a horizontal range maximum height is 4/5 is 77.47°.

Given, the maximum height of a projectile is 4/5 of its horizontal range. Let us assume that the maximum height and horizontal range be h and R respectively.

Let the initial velocity of the projectile be v₀ and the angle of projection be θ.

Since the projectile is launched over a horizontal surface, the initial vertical velocity of the projectile is 0.

Using the formulae of motion under constant acceleration, we can write, h = v₀sinθ)²/2g R = v₀²sin2θ/g

Where g is the acceleration due to gravity.

Substituting the value of v₀ from the first equation into the second equation, we get,

R = h tanθ/2 = 4R/5 tanθ/2

On simplification, we get,

tanθ/2 = 8/5

tanθ = 16/5

tan⁻¹16/5 = 77.47°

So, the launch angle is 77.47°.

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There are two identical iron bars, one of which is a permanent magnet and the other unmagnetized. We can identify that: when the magnetized bar is brought near the other bar, it will stick to it, indicating that it is magnetized. The bar that does not stick is unmagnetized.

Iron bars are used to make permanent magnets by a process called magnetization. Permanent magnets are composed of atoms and aligned electrons that have magnetic properties. The other bar that is not magnetized does not have aligned electrons, so it will not attract other magnets as a magnetized bar would.

The direction of a magnetic field will change when a magnet is brought near it. The North Pole will attract the South Pole, and they will come together. The North Pole will repel the North Pole, and the South Pole will repel the South Pole. The magnetized bar will be attracted to the unmagnetized bar, and the unmagnetized bar will not be attracted to the magnetized bar.

As a result, when the magnetized bar is brought near the other bar, it will stick to it, indicating that it is magnetized. The bar that does not stick is unmagnetized. Thus, with the aid of two bars, one magnetized and the other unmagnetized, we can determine which is which.

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The acceleration of the skateboarder while going down the ramp is found to be 1m/s².

The skateboarder began to go down the ramp and that at a speed of 1.0m/s. After 3 seconds it is found that the speed of the skater is increased to 4.0m/s.

We can use the equation,

V = U+at, where, V is final speed, a is acceleration, t is time and U is initial speed.

Putting all the values,

4 = 1 +a(3)

a = 3/3

a = 1m/s²

The acceleration of the skateboarder is 1m/s².

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Answer:

Explanation

What exactly do you need? More context to this problem would help me in helping you!

The property of objects that is best measured by their capacitance is c) the ability to store charge.

Capacitance is a measure of an object's ability to store an electric charge. It is defined as the ratio of the magnitude of the electric charge on each conductor to the potential difference between them. A capacitor is a device that stores electrical energy in an electric field between two conductive plates. The larger the capacitance of a capacitor, the more chance it can store for a given potential difference.

While objects that can conduct electric current or distort an external electrostatic field can also exhibit capacitance, these properties are not directly measured by capacitance

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What property of objects is best measured by their capacitance?

a) ability to conduct electric current

b) ability to distort an external electrostatic field

c) ability to store charge

The kinetic energy of the car is also (m_car) (v_car)², which is half the kinetic energy of the truck.

What is kinetic energy?

The kinetic energy of an object is given by the equation:

KE = (1/2)mv²

where KE is the kinetic energy, m is the mass of the object, and v is the speed of the object.

Given that the truck has twice the mass of the car and both are moving at the same speed, we can write:

m_truck = 2m_car

v_truck = v_car

The kinetic energy of the truck is given as k. Therefore, we can write:

k = (1/2)(m_truck)(v_truck)²

Substituting the values of m_truck and v_truck, we get:

k = (1/2)(2m_car)(v_car)²

k = (m_car)(v_car)²

Therefore, the kinetic energy of the car is also (m_car)(v_car)², which is half the kinetic energy of the truck.

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The range of frequency decrease that identifies cars above the speed limit is determined by the wavelength of the electromagnetic radiation used by the high-speed camera. Since the wavelength of the radiation is 26 mm, the frequency of the radiation must be 11.54 GHz.

Thus, any frequency decrease below 11.54 GHz will identify cars moving at 60 km/h or higher. This works because, as the car moves away from the camera, it reflects some of the radiation instead of all of it.

This reduces the frequency of the radiation, and any reduction below 11.54 GHz indicates that the car is moving faster than the speed limit. This ability of the camera to identify cars moving at or above the speed limit is essential for safety and enforcement of traffic laws.

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Answer:

Q = I t        definition of current

Q = .32 Coul/sec * 82 sec = 26.2 coul

The speed of the wave is 1.8 m/s.

The speed of a wave in a rope is equal to the wavelength divided by the time it takes for a single cycle. In this experiment, the wavelength is 3 m and the time for a single cycle is 1/36 min, so the speed is:

Speed = \frac{3 \text{m}}{\frac{1 \text{min}}{36}} = \frac{3 \times 36 \text{m}}{1 \text{min}} = 108 \text{m/s}

A standing wave experiment is performed to determine the speed of waves in a rope. The rope makes 36 complete vibrational cycles in exactly one minute. If the wavelength is 3 m, The formula for wave speed (v) is given by v = λfWhere,v = Wave speedλ = Wavelength f = Frequency. Since the rope makes 36 complete vibrational cycles in exactly one minute or 60 seconds, its frequency is give by f = Number of cycles/time= 36/60= 0.6 Hz. Substituting the values of wavelength and frequency, we get

v = λf= 3 m × 0.6 Hz= 1.8 m/s

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The maximum voltage that can be applied across the whole network is 1.28 V.

To calculate the maximum voltage that can be applied across the whole network, you need to apply Ohm's Law and power formula.

The equation for power is P = V²/R,

where P is power, V is voltage, and R is resistance.

Therefore, V = sqrt(P * R).

Given that each resistor is rated at 0.50 W, the power of the network is 2 x 0.50 W = 1 W.

Since the resistors are in parallel, the equivalent resistance can be calculated as follows:

1/R = 1/R1 + 1/R2 + 1/R3 + 1/R4 + 1/R5R = 1/(1/3 + 1/3 + 1/6 + 1/8 + 1/16)R = 1.6375 Ω

Therefore, the maximum voltage that can be applied across the whole network is V = sqrt(P * R) = sqrt(1 * 1.6375) = 1.28 V (approx).

Therefore, the maximum voltage that can be applied across the whole network is 1.28 V.

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The magnitude of acceleration is 7.44 m/s²

Given data:

Radius of the circle, r = 26 m,

Speed of the particle, v = 14 m/s.

Acceleration of the particle is given by the formula: a = v²/r

Where, v is the velocity of the particle and r is the radius of the circle on which the particle is moving.

Substitute the given values in the formula of acceleration.

a = v²/r

= (14 m/s)²/26 m

= 7.44 m/s² (rounded off to two decimal places)

Therefore, the magnitude of acceleration is 7.44 m/s².

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Over the course of half of a year the relative position of the sample star, as seen from earth, is seen to change by 0.400''. The parallax angle in this case is: 0.400''

Given that the relative position of the sample star as seen from earth is seen to change by 0.400'' over the course of half of a year. We are to determine the parallax angle in this case. Parallax angle (p) can be defined as the angle between the baseline and the line of sight to the star. It is the angle between two lines drawn from the star to the Earth, separated by six months, and viewed at a right angle to the baseline.

It is measured in seconds of arc (or arcseconds), and it is usually too small to measure directly. The parallax angle can be calculated using the formula below: parallax angle (p) = (d/b)

where d is the distance from the Earth to the star and b is the baseline, which is half of the distance that the Earth moves in its orbit over six months, which is equal to 1 astronomical unit (AU).

Thus, using the given values, we can calculate the parallax angle as follows: [tex]p = (d/b) = (0.400/1) = 0.400''[/tex]

Thus, the parallax angle, in this case, is 0.400'' (arcseconds). Therefore, the relative position of a star as seen from Earth changes with the change in the Earth's position. The change in position helps to determine the distance from the Earth to the star using the parallax angle.

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When an object acquires an electric charge, it gains either a positive or a negative charge. Positively charged objects can be used to leave another metallic object with a net negative charge. The process is known as charging by conduction.

The process of charging a conductor without touching it to the charging body but by bringing the charged body near the uncharged conductor is known as charging by conduction. A positively charged object can be used to leave another metallic object with a net negative charge by charging through conduction. It is possible because of the conservation of charges.

Charging through conduction involves the following steps: Bring a positively charged object closer to an uncharged metallic object. The positive object will transfer some of its electrons to the uncharged object because of its close proximity. The uncharged metallic object, after gaining electrons from the positively charged object, becomes negatively charged. The positive object loses electrons in the process and becomes less positively charged or sometimes negatively charged, depending on the situation.

When a positively charged object is brought near an uncharged metallic object, it gains electrons from the positive object, which creates a net negative charge in the metallic object. As a result, the metallic object is negatively charged due to the transfer of electrons from the positive object.

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Shorter wavelengths of light correspond to higher frequencies, and higher frequencies of light correspond to more energy in the photons. This means that the color of light is related to the energy of its photons: the higher the frequency of light, the higher the energy of its photons and the closer the color is to the blue end of the visible light spectrum.

The relationship between the wavelength of light, its color, and the energy of its photons is as follows:

The energy of a photon is directly proportional to its frequency and inversely proportional to its wavelength. In simpler terms, the shorter the wavelength of light, the greater the energy of its photons, while the longer the wavelength of light, the less energy its photons possess. The relationship between the wavelength of light and its color is also direct in that different colors are a result of light waves of different wavelengths.

The color spectrum ranges from red (longest wavelength) to violet (shortest wavelength), with colors in between, such as orange, yellow, green, blue, and indigo. This spectrum represents the visible part of the electromagnetic spectrum, with ultraviolet and infrared light having shorter and longer wavelengths, respectively. The energy of photons from these parts of the spectrum follows the same pattern as visible light, with ultraviolet photons possessing more energy than visible light photons and infrared photons possessing less energy than visible light photons.

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The segment of copper wire with the highest resistance at room temperature is segment (2), which is 2.0 m in length and has a cross-sectional area of 1.0 x [tex]10^{-6}[/tex] m².

What is the resistance?

The resistance of a conductor is given by the formula:

R = (ρL) / A

where R is the resistance, ρ is the resistivity of the material, L is the length of the conductor, and A is the cross-sectional area of the conductor.

Assuming that the resistivity of copper is constant, we can compare the resistance of the different segments of copper wire using the above formula.

We can calculate the resistance of each segment of copper wire as follows:

(1) R = (1.68 x [tex]10^{-8}[/tex] Ωm x 1.0 m) / (1.0 x [tex]10^{-6}[/tex] m²) = 0.017 Ω

(2) R = (1.68 x [tex]10^{-8}[/tex] Ωm x 2.0 m) / (1.0 x [tex]10^{-6}[/tex] m²) = 0.034 Ω

(3) R = (1.68 x [tex]10^{-8}[/tex] Ωm x 1.0 m) / (3.0 x [tex]10^{-6}[/tex] m²) = 0.0056 Ω

(4) R = (1.68 x [tex]10^{-8}[/tex] Ωm x 2.0 m) / (3.0 x [tex]10^{-6}[/tex] m²) = 0.0112 Ω

Therefore, the segment of copper wire with the highest resistance at room temperature is segment (2), which is 2.0 m in length and has a cross-sectional area of 1.0 x [tex]10^{-6}[/tex] m².

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Complete question is: The segment of copper wire with the highest resistance at room temperature is segment (2), which is 2.0 m in length and has a cross-sectional area of 1.0 x [tex]10^{-6}[/tex] m².

The box will slide a distance of 6.96 m before coming to a stop due to the force of kinetic friction.

To determine how far the box will slide on the floor after it is given a push with an initial speed of 3.8 m/s, we need to use the equations of motion for constant acceleration. The force of kinetic friction acting on the box will cause it to decelerate, eventually coming to a stop.

The distance traveled by the box can be found using the equation:

d = [tex](v_i^2 - v_f^2) / (2 * a)[/tex]

where d is the distance traveled, v_i is the initial speed, v_f is the final speed (which is zero since the box comes to a stop), and a is the deceleration caused by the force of kinetic friction.

The deceleration can be found using the equation:

a = -F[tex]_friction / m[/tex]

where Ffriction is the force of kinetic friction and m is the mass of the box.

Assuming a mass of 5 kg for the box and a coefficient of kinetic friction of 0.11, the force of kinetic friction can be found using the equation:

F_friction = friction coefficient * F_normal

where F_normal is the normal force (equal to the weight of the box) and the friction coefficient is a dimensionless quantity that depends on the nature of the contact surface.

The weight of the box is:

Fweight = m * g

where g is the acceleration due to gravity (9.81 m/s²).

Therefore, the force of kinetic friction is:

F_friction = (0.11) * (5 kg * 9.81 m/s²) = 5.40 N

Using the equation for deceleration, we get:

a = -Ffriction / m = -(5.40 N) / (5 kg) = -1.08 m/s²

Finally, we can use the equation for distance traveled to find the distance the box will slide:

d = [tex](v_i^2 - v_f^2) / (2 * a)[/tex] =[tex](3.8 m/s)^2 / (2 * 1.08 m/s^2)[/tex] = 6.96 m

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We can use the formula for electric field between two cylindrical conductors to calculate the maximum electric field magnitude between the cylinders:

E = (V ln(b/a))/d

where V is the potential difference between the conductors, ln is the natural logarithm, b and a are the radii of the outer and inner conductors, respectively, and d is the distance between the conductors.

Given:

V = 600 V

a = 20 mm = 0.02 m

b = 80 mm = 0.08 m

The distance between the conductors is the difference in their radii:

d = b - a = 0.08 m - 0.02 m = 0.06 m

The electric constant, k, is also needed:

k = 8.98755 × 10^9 N·m^2/C^2

Substituting these values into the formula, we get:

E = (V ln(b/a))/d

E = (600 V ln(0.08/0.02))/0.06

E = 3.5983 × 10^8 V/m or approximately 3.60 × 10^8 V/m

Therefore, the maximum electric field magnitude between the cylindrical conductors is approximately 3.60 × 10^8 V/m.

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The magnitude of the resultant force acting on the shot is 1000 N, and its direction is approximately 59.5 degrees above the horizontal.

The resultant force acting on the shot can be found using vector addition of the two forces applied on the shot.

The two forces can be represented as vectors in the xy-plane, with the horizontal force of 500 N pointing in the positive x-direction and the vertical force of 866 N pointing in the positive y-direction. We can use the Pythagorean theorem and trigonometry to find the magnitude and direction of the resultant force vector.

The magnitude of the resultant force vector F is given by:

|F| = [tex]\sqrt{(500 N)^2 + (866 N)^2)}[/tex]

|F| = 1000 N

The direction of the resultant force vector is given by the angle θ it makes with the positive x-axis:

tan θ = (866 N) / (500 N)

θ = tan⁻¹(866/500)

θ ≈ 59.5 degrees

Therefore, the magnitude of the resultant is 1000 N, and its direction is approximately 59.5 degrees.

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The correct option for the given statement is the first option i.e., they increase friction.

Mountain bike tires have large, knob-like treads. These tires are useful on steep slopes because they increase friction. Friction is a force that opposes motion between two surfaces that are in contact, and this force can be helpful when trying to stop or slow down the bike.

The treads help the tire to grip the surface better, which increases friction and makes it easier to control the bike. Additionally, mountain bike tires are wider than road bike tires, which also increases their contact area with the ground and thus, the friction.

They are also designed to withstand more abuse than road bike tires, as they are meant to handle rougher terrain, so they are less likely to puncture or wear down quickly. Hence, it can be concluded that mountain bike tires are useful on steep slopes because they increase friction.

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The tension in an elevator cable if the 1 500-kg elevator is descending with an acceleration of 2.8 m/s² is 18,900 N.

The tension in the elevator cable, for net force is :

[tex]F_{net} = ma[/tex]

where [tex]F_{net}[/tex] is the net force,

m is the mass of the elevator, and

a is the acceleration of the elevator.

Since the elevator is descending, we can take the upward direction as positive.

The forces acting on the elevator are the force of gravity (mg) and

the tension in the cable (T), where T is in the upward direction.

Therefore, the net force acting on the elevator is:

[tex]F_{net}= T - mg[/tex]

where g is the acceleration due to gravity (9.8 m/s²).

Substituting the given values into the equation:

[tex]F_{net} = T - mg[/tex]

[tex]ma = T - mg[/tex]

Rearranging the equation, we get:

[tex]T = ma + mg[/tex]

where T is the tension in the cable,

m is the mass of the elevator,

a is the acceleration of the elevator, and

g is the acceleration due to gravity.

Also Substituting the given values:

T = (1500 kg) × (2.8 m/s²) + (1500 kg) × (9.8 m/s²)

T = 4200 N + 14700 N

T = 18900 N

Therefore, the tension in the elevator cable is 18,900 N when the 1,500-kg elevator is descending with an acceleration of 2.8 m/s², downward.

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