why parachutist travel at constant velocity for the last part of his drop​

The hollow spherical shell has a mass of 7.90 kg and a radius of 0.230 m. It initially rests and then rotates with a constant acceleration of 0.895 rad/s2 around a stationary axis that lies along a diameter. The kinetic energy of the hollow spherical shell is 2.12 J.

The first step is to calculate the angular displacement using the formulaθ = n × 2π = 5.00 rev × 2π/rev = 31.4 rad[The angular displacement here is a positive value, as the spherical shell is rotating in a counterclockwise direction]. The next step is to calculate the angular velocity after 5.00 rev, using the formula

ωf = ωi + αt, where ωi = 0 [initial angular velocity]α = 0.895 rad/s2 [angular acceleration n]t = 2.22 s [time taken to complete 5.00 revolutions]Therefore,ωf = 0 + 0.895 × 2.22 = 1.987 rad/s Kinetic energy of the shell, K = 1/2 I ω²where I is the moment of inertia of the shell.

The moment of inertia of a hollow spherical shell is given by

I = 2/3 M R² where M is the mass of the shell and R is the radius of the shellSubstituting values, K = 1/2 × 2/3 × 7.90 × (0.230)² × (1.987)²= 2.12 J [to 2 significant figures]

Therefore, the kinetic energy of the hollow spherical shell is 2.12 J after it has turned through 5.00 revolutions.

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Answer: C for all of them

Explanation:

Because I'm smart

Jk

So basically its beacuse all of them have the same mixture since science can be interrelated and interchangebale in terms of formulas ok bye now

Thanks

Hope this helped you

Or not

Sorry if it didn't ig

The approximate time difference between the first P-wave and the first S-wave recorded at a seismic station located 8000 kilometers from the earthquake’s epicenter would be 11 minutes 20 seconds.

Given the distance from earthquake’s epicenter (d) = 8000km

The approximate time difference between a P-wave and an S-wave can be calculated using the following formula:

From the diagram given we can see that the speed of P-wave (v1)= 8km/s

The speed of S-wave (v2) = 4.75km/s

We know that the time is calculated as distance per speed.

Then time taken for P-wave (t1) = d/v1

Time taken for S-wave (t2) = d/v2

Time Difference (t) = t1 - t2

Then, [tex]t = d/v1 - d/v2 = d((v2 - v1)/v1*v2)[/tex]

[tex]t = 8000 * (8 - 4.75/8 * 4.75)[/tex]

t = 680.4 seconds

So, for an earthquake epicenter located 8000 km away, the time difference would be:

Time Difference = 11 minutes 20 seconds

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The moving objects farther apart will result in a weaker gravitational attraction between them.

When two objects are moved farther apart, the force of gravity between them decreases. This relationship is described by Newton's Law of Universal Gravitation,

which states that the gravitational force between two objects is proportional to the product of their masses and inversely proportional to the square of the distance between their centers.

Mathematically, this can be represented as F

= G * (m1 * m2) / r^2, where F is the gravitational force,

G is the gravitational constant, m1 and m2 are the masses of the objects, and r is the distance between their centers.

As the distance (r) increases, the denominator (r^2) becomes larger, causing the overall force of gravity (F) to decrease.

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a. The translational speed of the cylinder at the bottom of the inclined plane is v = sqrt(2gh); b. a = (2g sin(theta) / R) R = 2g sin(theta) is the acceleration of the center of mass of the cylinder down the inclined plane. Rolling Cylinder on Inclined Plane; c. The minimum coefficient of friction required for the cylinder to roll without slipping is equal to the tangent of the angle of the inclined plane.

The potential energy of the cylinder at the top of the inclined plane is Mgh, where g is the acceleration due to gravity. At the bottom of the inclined plane, all of this potential energy has been converted to kinetic energy, so:

1/2 M v^2 = Mgh

where v is the translational speed of the cylinder at the bottom of the inclined plane.

Solving for v, we get:

v = sqrt(2gh)

b. The force of gravity acting on the cylinder down the inclined plane has two components: one parallel to the plane, Mg sin(theta), and one perpendicular to the plane, Mg cos(theta).

The net torque on the cylinder is due to the parallel component of the force of gravity, which acts at a distance R from the center of mass of the cylinder. The torque is therefore:

τ = (Mg sin(theta)) R

The rotational inertia of the cylinder is 1/2MR^2, so the angular acceleration of the cylinder is:

α = τ / I = (Mg sin(theta)) R / (1/2MR^2) = 2g sin(theta) / R

The linear acceleration of the center of mass of the cylinder is

a = αR, so:a = (2g sin(theta) / R) R = 2g sin(theta)

This is the acceleration of the center of mass of the cylinder down the inclined plane.

c. In order for the cylinder to roll without slipping, the force of friction between the cylinder and the inclined plane must provide enough torque to prevent the cylinder from slipping.

The maximum force of friction is μN, where μ is the coefficient of friction and N is the normal force on the cylinder. The normal force is equal to the weight of the cylinder, Mg cos(theta). The torque due to the force of friction is:

τ_friction = μN R = μMg cos(theta) R

The torque due to the force of gravity parallel to the inclined plane is still Mg sin(theta) R. The net torque is therefore:

τ_net = Mg sin(theta) R - μMg cos(theta) R

For the cylinder to roll without slipping, this net torque must be equal to the torque due to the angular acceleration, which is (1/2)MR^2 α. Setting these two torques equal, we get:

Mg sin(theta) R - μMg cos(theta) R = (1/2)MR^2 (2g sin(theta) / R)

Solving for μ, we get:

μ = tan(theta)

So the minimum coefficient of friction required for the cylinder to roll without slipping is equal to the tangent of the angle of the inclined plane.

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When the water goes from the thicker hose out through the narrow nozzle, a fire hose exerts a force on the person holding it. To hold a 7.0-cm-diameter hose delivering through a 0.75-cm-diameter nozzle, the force required is 34.8 N.

How much force is required to hold a 7.0-cm-diameter hose delivering through a 0.75-cm-diameter nozzle, As per Bernoulli's equation, the pressure P of a fluid (liquid or gas) at any point along its path is equal to the sum of its static pressure (p0),

the kinetic energy per unit volume of the fluid (0.5ρv2),

and its potential energy per unit volume (ρgh),

where ρ is the density of the fluid, v is the velocity of the fluid, g is the acceleration due to gravity, and h is the height relative to a reference point of the fluid point in question. 0.5ρv1^2 + P1 + ρgh1 = 0.5ρv2^2 + P2 + ρgh2

The Bernoulli principle can be simplified to: F1/A1 = F2/A2

Where: F1 and F2 are the forces exerted by the fluid on the hose A1 and A2 are the areas of the hose and nozzle, respectively.

Substituting the values:F1 = (F2A1)/A2 = (A2/A1)ρv2^2A1 = (7/2)2π = 38.48 cm2A2 = (0.75/2)2π = 0.44 cm2v1 = v2 (since the water is incompressible)ρ = 1000 kg/m3Thus:F2 = 0.5ρv2^2A2F1 = 0.5ρv2^2A2 (A1/A2) = (0.5 × 1000 × v2^2 × 0.44) × (38.48/0.44)F1 = 34.8 N

Therefore, the force required to hold a 7.0-cm-diameter hose delivering through a 0.75-cm-diameter nozzle is 34.8 N.

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The current in the line segment that contains battery 1 is 1.5A.

To solve for the current in the line segment that contains battery 1, we need to use Kirchhoff's laws, specifically the loop rule. According to the loop rule, the algebraic sum of the potential differences around any closed loop in a circuit must be zero.

Let's assume that the current in the loop is I, and we will choose a clockwise direction for the loop. The potential difference across resistor R1 is IR1, and the potential difference across battery 1 is 6V, which is negative since we are going from the positive to the negative terminal of the battery. The potential difference across resistor R2 is IR2, and the potential difference across battery 2 is 9V, also negative.

Thus, applying the loop rule, we get:

-6V + IR1 + IR2 - 9V = 0

Simplifying, we get:

I(R1 + R2) = 15V

Substituting the values of R1 and R2, we get:

I(4Ω + 6Ω) = 15V

I(10Ω) = 15V

I = 1.5A

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--The complete question is, In a circuit with two batteries and two resistors, where the voltage of battery 1 is 6V and the voltage of battery 2 is 9V, and the resistors have values of 4Ω and 6Ω respectively, what is the current in the line segment that contains battery 1, assuming a negligible internal resistance for both batteries?--

The buoyant force on the chamber will be 750,775N and tension in the cable will be -21,031N

(a) The buoyant force on the chamber is equal to the weight of the water that displaced by the chamber.

So if we have to find the volume of water displaced by the chamber, we need to find its volume first.

External diameter of the chamber ⇒ 5.20 m

Radius ⇒ 2.60 m.

Formula for the volume of a sphere is,

V = (4/3) × π × r³

Substituting,

V = (4/3) × π × (2.60 m)³ = 74.63 m³

Mass of the chamber ⇒ 74,400 kg

Weight, W = mg = 74,400 kg × 9.81 m/s² = 729,744 N

Density of seawater ⇒ 1025 kg/m³.

The mass of water displaced by the chamber,

[tex]m_{displaced}[/tex] = V × ρ = 74.63 m³ × 1025 kg/m³ = 76,469 kg

The weight of the displaced water is,

[tex]W_{displaced} = m_{displaced}*g = 76,469 * 9.81 m/s^2 = 750,775 N[/tex]

So we can say the buoyant force on the chamber is equal to the weight of the displaced water,

[tex]F_{buoyant}=W_{displaced}=750,775 N[/tex]

(b) The tension in the cable is equal to the weight of the chamber minus the buoyant force on the chamber. In other words, the tension makes the chamber from floating to the surface.

Tension = Weight of the chamber - Buoyant force

[tex]T=W-F_{buoyant}[/tex]  [tex]= 729,744 N - 750,775 N = -21,031 N[/tex]

Tension in the cable is downward. That is the cable is under compression. That is why there is a negative sign here. Chamber is heavy enough to sink to the seafloor and negative value states that. The cable is under tension due to the weight of the chamber

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Answer:

[tex]1.2\; {\rm N}[/tex], assuming that all other forces on this crab were balanced.

Explanation:

The impulse [tex]J[/tex] on an object is equal to the change in momentum [tex]\Delta p[/tex]. In other words:

[tex]J = \Delta p[/tex].

If the mass [tex]m[/tex] of the object stays the same (as in the case of this question), the change in momentum can be rewritten as:

[tex]J = \Delta p = m\, \Delta v[/tex], where [tex]\Delta v[/tex] is the change in velocity.

Impulse is also equal to the net force on the object [tex]F_{\text{net}}[/tex] times the duration [tex]\Delta t[/tex] over which the force is applied:

[tex]J = F_{\text{net}}\, \Delta t[/tex].

Equate the two expressions for [tex]J[/tex] to obtain:

[tex]F_{\text{net}}\, \Delta t = m\, \Delta v[/tex].

In this question:

Rearrange [tex]F_{\text{net}}\, \Delta t = m\, \Delta v[/tex] and solve for the net force [tex]F_{\text{net}}[/tex]:

[tex]\begin{aligned}F_{\text{net}} &= \frac{m\, \Delta v}{\Delta t} \\ &= \frac{(3\; {\rm kg})\, (2\; {\rm m\cdot s^{-1}})}{5\; {\rm s}} \\ &= 1.2\; {\rm kg \cdot m\cdot s^{-2}} \\ &= 1.2\; {\rm N}\end{aligned}[/tex].

Assuming that all other forces on this crab are balanced, the net force on the crab would be equal to the force from the tide. Hence, the tide would have pushed the crab with a force of [tex]1.2\; {\rm N}[/tex].

When an 80 kg man moving at 120.75 m/s pushes a 53 g stone away from him while lying on a surface with little friction, the stone moves at a speed of 4.6 m/s.

Let the man acquire the speed v in the opposite direction.Let the momentum be conserved here.The momentum of the stone before the push is: p₁ = 0The momentum of the stone after the push is: p₂ = m × vWhere m is the mass of the stoneThe impulse is given as: J = p₂ - p₁Now, we know that the impulse (J) = Force (F) × time (t).

We also know that force is mass × acceleration. Therefore, the impulse can be written as: J = m × a × tUsing these equations we can solve for the acceleration (a).a = J/(m × t)Now, the acceleration is the same for the man and the stone, but the masses are different.

Therefore, the man acquires a speed v that is much smaller than the velocity of the stone. Substituting the given values we get,a = (m₂v₂ - m₁v₁)/(m₂t₂)  =  (0.053 × 4.6)/(80 × t) = 0.00109/t m/s². After equating the forces acting on both the stone and the man, we have;Fman = - Fstone.

This is because the man's speed is in the opposite direction to the stone.Let u be the initial speed of the man before he shoves the stone away from himself.

Using the momentum formula, m1u1 + m2u2 = m1v1 + m2v2.The mass of the stone is 0.053 kg while the man's mass is 80 kg.So,80u + 0.053 × 0 = 80v + 0.053 × 4.6v = (80u) / 0.053+4.6v = (80u) / 0.053v = 120.75u.

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A constant torque of 0.703 N·m will bring the grinding wheel from rest to an angular speed of 1200 rev/min in 2.5 s.

First, we need to convert the final angular speed to radians per second:

ω = (1200 rev/min) x (2π rad/rev) x (1/60 min/s) = 125.66 rad/s

The moment of inertia of the grinding wheel can be calculated using the formula for a solid cylinder:

I = (1/2)mr² = (1/2)(2.80 kg)(0.100 m)² = 0.014 J·s²

The angular acceleration can be found using the formula:

α = ω/t = (125.66 rad/s) / (2.5 s) = 50.264 rad/s²

The torque required to produce this angular acceleration can be found using the formula:

τ = Iα = (0.014 J·s²)(50.264 rad/s²) = 0.703 N·m

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The cable being run between the two wiring closets is most likely a fiber optic cable.

Fiber optic cables are used for high-speed data transmission over long distances. They consist of a core of optically transparent material, such as glass or plastic, surrounded by a cladding material that reflects light back into the core.

The core and cladding are protected by an outer jacket or sheath that provides physical protection and insulation. Fiber optic cables are preferred for long-distance communication because they are less susceptible to interference and signal degradation than copper cables.

They are also able to transmit data at much higher speeds and over longer distances without the need for signal repeaters.

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The radius of the circle can be calculated using the formula; Centripetal acceleration = v^2/r, where v is the speed and r is the radius of the circle.

Substitute the given values; Centripetal acceleration = 20 m/s^2Speed = 15 m/s Using the formula above, we have;20 = (15)^2/rr = (15)^2/20r = 11.25mTherefore, the radius of the circle is 11.25 m.
The radius of the circle can be calculated using the formula for centripetal acceleration: a_c = v^2 / r, where a_c is the centripetal acceleration, v is the speed, and r is the radius. In this case, a_c = 20 m/s^2 and v = 15 m/s. Rearranging the formula to find r, we get:

r = v^2 / a_c = (15 m/s)^2 / (20 m/s^2) = 225 m^2 / 20 m/s^2 = 11.25 m

The radius of the circle is 11.25 meters.

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In a magnetic field, a charged particle's trajectory is curving because of the effect of the magnetic field on the charged particle.

A magnetic field is a vector field that arises from electric currents and magnetized materials. The magnetic field is a vector field that has both magnitude and direction. A magnetic field exists in the vicinity of a magnetic material or a moving electric charge in the form of a flux of force-carrying particles known as virtual photons.

The magnetic field, like the electric field, is a fundamental entity of nature that is used in a variety of applications. In a magnetic field, charged particles follow a helical path that is nearly circular. The magnitude of the charged particle's velocity and the magnetic field's strength both influence the radius of the circle.

A charged particle's velocity vector and the magnetic field's direction are perpendicular to each other in the plane that is perpendicular to the magnetic field. The magnitude of the charged particle's velocity vector is constant throughout the motion because there is no force parallel to the velocity vector in the magnetic field.

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The velocity is 0.784 m/s when a 61 kg object is experiencing a net force of 25 n while traveling in a circle of radius 1.5 m.

At the point when an item goes in a round way, it encounters a centripetal power coordinated towards the focal point of the circle, which is given by F = [tex]mv^2/r[/tex], where F is the power, m is the mass, v is the speed, and r is the sweep of the circle. For this situation, the net power experienced by the 61 kg object is 25 N, which is equivalent to the centripetal power. We can adjust the equation to tackle for v: v = sqrt(Fr/m). Subbing the given qualities, we get:

[tex]v = sqrt(25 N * 1.5 m/61 kg)= sqrt(0.6135 m^2/s^2)= 0.784 m/s[/tex]

Consequently, the speed of the item is 0.784 m/s while going surrounded by range 1.5 m and encountering a net power of 25 N.

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The smallest plane mirror that one can buy to see their entire reflection without moving their head would have a height of 3.4 meters and a width of 1.1 meters, assuming an average height of 1.7 meters

To see all of oneself in a plane mirror, the mirror must be tall enough to reflect the entire height of the person and wide enough to reflect the entire width. Let's assume an average height of 1.7 meters for a person.

The minimum height of the mirror should be twice the person's height so that the person can see their full reflection, including the head and feet. Therefore, the minimum height of the mirror would be 2 x 1.7 = 3.4 meters.

To determine the minimum width of the mirror, we need to consider the distance between the person and the mirror. Let's assume this distance to be about 1 meter. The minimum width of the mirror would then need to be twice the person's shoulder width plus the distance between the person and the mirror.

Assuming an average shoulder width of 50 cm, the minimum width of the mirror would be 2 x 50 cm + 1 m = 1.1 meters. An average shoulder width of 50 cm, and a distance of 1 meter between the person and the mirror.

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When equal masses of copper, lead, and basalt are placed in direct sunlight for the same time interval and they are all at the same initial temperature, they would be expected to change in temperature as follows: Copper would be expected to increase in temperature the most since it has the highest thermal conductivity.

This means that it can conduct heat better and faster than lead and basalt, allowing it to absorb more heat from the sun and increase in temperature more quickly. Lead would be expected to increase in temperature less than copper but more than basalt since it has lower thermal conductivity than copper but higher than basalt. Therefore, the lead would absorb less heat from the sun than copper but more than basalt, resulting in a moderate increase in temperature. Basalt would be expected to increase in temperature the least since it has the lowest thermal conductivity of the three materials. This means that it can conduct heat the poorest and slowest, resulting in less heat absorbed from the sun and less increase in temperature compared to copper and lead.

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In finding the mass flux of naphthalene after diffusing with a spherical particle, we need to calculate the mass transfer coefficient that can be measured to find out how much better the mass spreads to the surrounding.

The formula for mass transfer is  

[tex]Kg/m^{2s} = ( Sh *D)/r[/tex]

Where,

Sh = Sherwood number, D = diffusion coefficient

After calculating the mass transfer using the given formula it is easy to calculate the mass flux using Fick's Law

Fick's Law can be used in forming a formula that can help in finding the mass flux. Therefore,

The formula for Fick's Law is

[tex]J = -Kg/m^{2s} * (C1 - C2)[/tex]

Where

J = mass flux

C1 = presence of naphthalene on the surface of the particle

C2 = presence of naphthalene in the bulk fluid

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The period of simple harmonic motion for this 3.00-kg object is approximately 6.87 seconds.

To find the period of simple harmonic motion for a 3.00-kg object with an amplitude of 6.00 m and a maximum acceleration of 5.00 m/s², we first need to find the angular frequency (ω).

We know the formula for the maximum acceleration in simple harmonic motion is given by:

amax = ω² * A

where amax is the maximum acceleration, A is the amplitude, and ω is the angular frequency.

Rearranging the formula to solve for ω, we get:

ω = sqrt(amax / A)

Plugging in the given values:

ω = sqrt(5.00 m/s² / 6.00 m)

ω ≈ 0.912 m^(-1/2) s^(-1)

Now that we have the angular frequency, we can find the period (T) using the relationship between angular frequency and period:

ω = 2π / T

Rearranging the formula to solve for T, we get:

T = 2π / ω

Plugging in the value of ω we found earlier:

T ≈ 2π / 0.912 m^(-1/2) s^(-1)

T ≈ 6.87 s

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The total resistance across the circuit is 44 ohms

According to Ohm's Law, the resistance (R) of a wire is equal to the potential difference (V) across the wire divided by the current (I) flowing through it. Using this formula:

R = V/I = 220V / 5A = 44 ohms

So the resistance of the wire is 44 ohms.

To calculate the total voltage in the circuit, we need to know the voltage across all the components in the circuit. If there are no other components in the circuit, then the total voltage would simply be the voltage across the wire, which is 220V.

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The main factor that led to Jupiter having so many moons compared to the inner terrestrial planets is its size and mass.

Jupiter is the largest planet in our solar system, and its strong gravitational force allows it to capture and hold onto many objects in its orbit. Jupiter's location in the outer solar system, beyond the asteroid belt, means that there are more objects available for it to capture compared to  inner planets. This combination of size, mass, and location provides Jupiter with the ideal conditions to accumulate and retain a large number of moons. The gravitational force of Jupiter is strong enough to capture asteroids and comets that pass near its orbit, resulting in formation of many moons.

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Electromagnetism fundamentally breaks away from the materialism associated with the physics of Newton and Democritus in that the electromagnetic field is physically real, even though it is not made of atoms.

This distinction is significant because both Newtonian physics and Democritus atomism rely on the idea that matter, made up of atoms or other particles, is the primary building block of the universe. Newtonian physics, based on the concept of gravity as the only force in the universe, focuses on the interaction of massive objects and their motion.

Democritus, an ancient Greek philosopher, proposed that the universe was made up of indivisible particles called atoms, which form various materials through their combinations. On the other hand, electromagnetism introduces the concept of electric and magnetic fields, which are not made of material particles or atoms.

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The width of the 20 m long conductor should be approximately 0.05 meters.

To determine the width of the conductor, we first need to find its cross-sectional area (A) using the given uniform current density (J) and current (I). The formula for this is:

A = I / J

Plugging in the given values:

A = 1.0 A / 400 A/m² = 0.0025 m²

Since the conductor has a square cross-section, its width (w) will be the square root of the cross-sectional area:

w = √A = √0.0025 m² ≈ 0.05 m

So, the width of the 20 m long conductor should be approximately 0.05 meters.

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The concept of conservation of mass and momentum in fluid physics is the foundation for the technique used to calculate the drag on a 2-dimensional airfoil by observing the spread of its wake velocity.

A wake, or area of disrupted flow, is produced behind the airfoil as the air moves around it. It is feasible to calculate the drag force operating on the airfoil as well as other characteristics like lift and moment by observing the velocity distribution in this wake.

This method, also known as wake detection or wake survey, is widely applied in experimental fluid dynamics.

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The energy stored in the flywheel is approximately 32,949.6 Joules.

The energy stored in the flywheel can be calculated using the formula for rotational kinetic energy: KE = 0.5 * I * ω², where KE is the kinetic energy, I is the moment of inertia, and ω is the angular velocity.

For a solid cylinder, the moment of inertia (I) is given by the formula: I = 0.5 * M * R², where M is the mass and R is the radius.

Substituting the given values: I = 0.5 * 60 kg * (1.8 m)² = 97.2 kg m².

Now, we can find the kinetic energy: KE = 0.5 * 97.2 kg m² * (26.0 rad/s)² ≈ 32949.6 J.

So, the energy stored in the flywheel is approximately 32,949.6 Joules.

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Person is moving at most  at a speed of 11.8 m/s

We can use the principle of conservation of energy.  In this scenario, the person starts at a height of 4.0 m and ends at a height of 5.0 m. Using the formula for gravitational potential energy, we can calculate that the initial potential energy is

[tex]63 kg * 9.81 m/s^2 * 4.0 m = 2474.04 J.[/tex]

At the top of the curve, all of this energy is converted into potential energy again, so the kinetic energy is zero.

[tex]63 kg * 9.81 m/s^2 * 5.0 m = 3085.05 J.[/tex]

Equating these energies, we get[tex]1/2 mv^2 = 3085.05 J[/tex],

where m is the mass of the person and v is the velocity. Solving for v, we get [tex]v = \sqrt{(2 * 3085.05 J / 63 kg)} = 11.8 m/s[/tex].

Therefore, the person is moving at a speed of 11.8 m/s upon leaving the waterslide.

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The given statement "when measuring absorbance readings it is important to hold the wavelength constant across all samples" is true because it is important to hold the wavelength constant across all samples.

Keep the wavelength constant across all samples when taking measurements of absorbance. This is due to the fact that a substance's absorbance changes depending on the wavelength of light used to detect it.

Therefore, the absorbance measurements won't be precise and trustworthy if the wavelength is not maintained constant. A single wavelength of light is usually used for all measurements in a given experiment to guarantee precise and trustworthy results.

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For the given LC circuit (inductor-capacitor) , the sum of the energy stored in the capacitor and that in the inductor remains constant.

Energy transferred between the inductor and capacitor. So the total energy oscillating between the two components at a resonant frequency.

The energy stored in the capacitor and inductor individually varies over time as the energy oscillates between them.

When voltage changes the energy stored in the capacitor also changes. This is caused by the change in current flowing.

So we can say both the energy stored in the capacitor and the energy stored in the inductor remains constant in a given LC circuit.

The energy dissipated in the circuit can vary over time. Like that the energy stored in the current flowing in the circuit and the energy stored in the capacitor can also vary over time in an LC circuit.

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The new angular speed of the merry-go-round after the man walks to a point 1.0 m from the center is approximately 1.80 rad/s.

Let's denote the initial angular speed of the merry-go-round as ω₁, and the new angular speed after the man walks to a point 1.0 m from the center as ω₂.

Given:

Initial angular speed ω₁ = 0.30 rad/s

Mass of the man m = 80.0 kg

Initial distance of the man from the axis of rotation r₁ = 2.0 m

New distance of the man from the axis of rotation r₂ = 1.0 m

Mass of the merry-go-round (cylinder) M = 6.50 * 10² kg

Radius of the merry-go-round (cylinder) R = 2.00 m

The conservation of angular momentum can be applied in this scenario, where the initial angular momentum of the system is equal to the final angular momentum of the system.

The initial angular momentum of the system is given by:

Initial angular momentum L₁ = Moment of inertia of the man about the axis of rotation x initial angular speed of the merry-go-round

The moment of inertia of the man about the axis of rotation can be calculated using the formula for the moment of inertia of a point mass rotating about an axis at a distance r from the axis of rotation:

Moment of inertia of the man about the axis of rotation I₁ = m x r₁²

The final angular momentum of the system is given by:

Final angular momentum L₂ = Moment of inertia of the man about the new axis of rotation x new angular speed of the merry-go-round

The moment of inertia of the man about the new axis of rotation can be calculated using the same formula as above, but with the new distance r₂:

Moment of inertia of the man about the new axis of rotation I₂ = m x r₂²

Setting the initial and final angular momenta equal to each other, we can solve for the new angular speed ω₂:

L₁ = L₂

I₁ * ω₁ = I₁ * ω₂

Substituting the expressions for I₁, I₂, and the given values:

m * r₁² * ω₁ = m * r₂² * ω₂

Simplifying:

r₁² * ω₁ = r₂² * ω₂

Plugging in the given values for r₁, r₂, and ω₁, and solving for ω₂:

2.0² * 0.30 = 1.0² * ω₂

[tex]\omega_2 = \frac{(2.0^2*0.30)}{1.0^2}[/tex]

ω₂ ≈ 1.80 rad/s.

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The y-coordinate of the position vector at time t is (5/2)t² - 8t - 1/2.

It is given the velocity vector components as:

v(t) = (4t - 6) i + (5t - 8) j

To find the position vector at time t, we need to integrate the velocity vector with respect to time. integrate each component separately:

x(t) = ∫ (4t - 6) dt = 2t² - 6t + C1

y(t) = ∫ (5t - 8) dt = (5/2)t² - 8t + C2

where C1 and C2 are constants of integration. We can determine these constants by using the initial position of the particle given as:

r(0) = (2, -1)

At time t=0, we have:

x(0) = 2, y(0) = -1

Substituting these values in the expressions for x(t) and y(t), may get:

C1 = 2, C2 = -1/2

So, the position vector at time t is:

r(t) = (2t² - 6t + 2) i + ((5/2)t² - 8t - 1/2) j

To find the y-coordinate of the position vector at time t, may simply need to substitute t into the expression for y(t):

y(t) = (5/2)t² - 8t - 1/2

Therefore, the y-coordinate of the position vector at time t would be (5/2)t² - 8t - 1/2.

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