a girl spins around in a circle trying to make herself dizzy. without changing her position, she starts spinning twice as fast. by how much did her rotational kinetic energy change?

The major patterns in our solar system that provide clues about its formation include: Orbital Plane Alignment, Terrestrial and Jovian Planets, Asteroid Belt and Kuiper Belt and Moons and Rings.  

Orbital Plane Alignment: The planets in our solar system generally orbit the Sun in a relatively flat plane known as the ecliptic.

Terrestrial and Jovian Planets: The solar system exhibits a distinct division between terrestrial planets (Mercury, Venus, Earth, and Mars) and jovian planets (Jupiter, Saturn, Uranus, and Neptune).

Asteroid Belt and Kuiper Belt: Between the terrestrial and jovian planets, there are notable regions where smaller objects are concentrated.

Moons and Rings: Many planets in the solar system have moons and some have rings.

Notable exceptions to these general patterns include:

Pluto and its Moon: Pluto is a dwarf planet located in the Kuiper Belt and was once classified as the ninth planet in our solar system. It has an eccentric orbit that is inclined compared to the other planets' orbits. Pluto also has a large moon called Charon, which is relatively large compared to Pluto itself.

Moons of Jovian Planets: Jovian planets have numerous moons, and some of them exhibit interesting features. For example, Jupiter's moon Io is volcanically active, Europa is believed to have a subsurface ocean, and Saturn's moon Titan has a thick atmosphere.

Irregular Orbits: Some small bodies in the solar system, such as comets and certain asteroids, have highly elliptical or inclined orbits that deviate from the general patterns observed.

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Concentrated solar power facilities are solar power—generating facilities that generate electricity at large centralized facilities and transmit that power to homes and businesses through the electric grid .

Solar power refer to electric power or electricity that is generated from sun rays or radiations while using solar panels and other technologies.

Therefore, Concentrated solar power facilities solar power—generating facilities that generate electricity at large centralized facilities and transmit that power to homes and businesses through the electric grid.

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Answer:

10 kg rock at 15 degrees

Explanation:

did test

When the balance of the forces acting on the object you are acting on results in no changes in motion. Unbalanced forces have an influence on the item that are acting on and do not cancel one another out.

Two things cause this. An object will move if an imbalanced pressure pushes or pulls on it while it is at rest. Forces acting can also cause an item in motion to shift its speed or direction.

Because of unequal power or strength delivered to one side of an item, an imbalanced force results in a shift in motion, pace, direction, or movements. There are forces working against the other side.

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The angular velocity of the skater during the finale is 2.18 rad/s.

The conservation of angular momentum is a principle in physics that states that the total angular momentum of a system remains constant if no external torques act on the system. Mathematically, this can be expressed as L1 = L2, where L1 is the initial angular momentum of a system, L2 is the final angular momentum of the system, and the total torque acting on the system is zero. This principle is analogous to the conservation of linear momentum, which states that the total linear momentum of a system remains constant if no external forces act on the system. The conservation of angular momentum is an important principle in many areas of physics, including mechanics, electromagnetism, and quantum mechanics.

We can use the conservation of angular momentum to solve this problem. The initial angular momentum of the skater and the hand-arms is given by:

L1 = I1 * w1

where I1 is the moment of inertia of the skater's body, and w1 is the initial angular velocity. Since the hand-arms are extended, their moment of inertia can be neglected.

When the skater pulls their arms inward, the moment of inertia of the system decreases. The final moment of inertia is given by:

I2 = I1 + 2md^2

where m is the mass of each hand-arm, d is the distance of the hand-arm from the axis of rotation, and we multiply by 2 since there are two hand-arms.

The final angular velocity w2 can be found by equating the initial and final angular momentum:

L1 = I1 * w1 = I2 * w2

Substituting the expressions for I1, I2, and simplifying, we get:

w2 = w1 * I1 / (I1 + 2m(d2^2 - d1^2))

where d1 is the initial distance of the hand-arm from the axis of rotation (0.60 m), and d2 is the final distance of the hand-arm from the axis of rotation (0.20 m).

Substituting the given values, we get:

w2 = 0.50 m/s * 1.719 kgm^2 / (1.719 kgm^2 + 2 * 5.0 kg * (0.20 m^2 - 0.60 m^2))

w2 = 2.18 rad/s

Therefore, The skater's angular velocity during the grand finale is 2.18 rad/s.

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Given :

Height from which rock is dropped, h = 17.5 m.

Initial velocity, u = 0 m/s.

To Find :

Speed does the rock strike the water.

Solution :

We know, by equation of motion :

\(v^2-u^2=2as\)      ......( 1 )

Here , a = g = 9.8 m/s² ( Acceleration due to gravity )

Putting all given values in 1 , we get :

\(v^2-u^2=2as\\\\v=\sqrt{2gh}\\\\v=\sqrt{2\times 9.8\times 17.5}\ m/s\\\\v=18.5\ m/s\)

Therefore, speed with rock strike the water is 18.5 m/s.

Hence, this is the required solution.

Solar eclipses occur in the same place about every 375 years.

Solar eclipses on Earth only occur around the New Moon due to the alignment of Earth, the Moon, and the Sun that happens at that time. However, this doesn't mean that eclipses of the Sun happen every New Moon. The New Moon also has to be near a lunar node, which can only happen during a period of time that occurs a little less than every six months, and lasts around 34.5 days on average.

It takes about 375 years on average for a total solar eclipse to happen again at the same place. Furthermore, there are about 240 solar eclipses each century.

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The resistor of the electric lamp is marked at 240 volts and 60 watts is 960 ohms. Thus, option D is correct.

The resistance is a property that gives obstruction the current flow.  It blocks the current flow in the circuit. The unit of resistance is the ohm.    

From the given,

The voltage of the electric lamp (E) = 240 volt

Power in the circuit (P) = 60 watt

Resistance =?

Power (P) = E² / R

R = E²/P

   = 240×240/60

  = 960 Ω

The resistance of the electric lamp with a given voltage and power is 960 Ω. Thus, the ideal solution is D.

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When a vertically falling firecracker bursts, the vector sum of momentum fragments does not satisfy either of the given options. The correct answer is d) neither of these.

When the firecracker bursts, it explodes in multiple directions, resulting in the fragmentation of its mass. The momentum of the fragments is distributed in various directions, including both horizontal and vertical components.

Therefore, option a) is incorrect because the horizontal momentum fragments do not cancel out to zero. Option b) is also incorrect because the vertical momentum of the fragments does not necessarily equal the momentum of the firecracker before bursting.

The bursting of the firecracker introduces additional velocities and forces that alter the distribution of momentum among the fragments.

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Answer:

Option D is correct.

Explanation:

\(Cm_{246} +C_{12}\) → \(No_{254}\)

Hence, it is the fusion reaction.

When two or more nuclei fuse together to form a heavy nucleus with the energy released, is called fusion.

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The energy of a photon is directly proportional to its frequency, which means that if the frequency of a photon is halved, its energy will also be halved.

This relationship is described by the equation E = hf, where E is the energy of the photon, h is Planck's constant, and f is the frequency of the photon. Therefore, if the frequency of a photon is reduced by a factor of two, its energy will also be reduced by a factor of two. This is a fundamental principle of quantum mechanics and is important in many areas of physics and engineering. Understanding the relationship between frequency and energy is crucial for designing and operating technologies that rely on electromagnetic radiation, such as lasers and communication systems.

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Answer:

I think?

Explanation:

1.  20 seconds

2. 1 mile

3.  3 miles

I think i got it right not sure

Answer:

Explanation:

1m/ 10s^2

5 miles?

15 miles

To determine the distance spanned by the diffraction spot, we need to consider the properties of the diffraction pattern and the given information.

Given:

- The screen is 30 cm behind the fish.

- The entire path of the laser, including the water and tissue, has an index of refraction close to that of water.

- The properties of the diffraction pattern are determined by the wavelength in water.

Since the diffraction pattern is formed by the interaction of light waves with obstacles or apertures, the spot's size or spread depends on factors such as the wavelength of light and the size of the aperture.

Without specific information about the wavelength or aperture size, it is not possible to determine the exact distance spanned by the diffraction spot. Additional details regarding the specific setup or measurements would be necessary to calculate or estimate the distance spanned by the diffraction spot.

Please provide further information or clarify the parameters related to the diffraction setup if you require a more specific answer.

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To estimate the magnetic field 1 meter from a lightning bolt, we can use Ampere's Law, which relates the magnetic field around a current-carrying conductor to the current.

∮ B · dl = μ₀ * I_enc

B * 2π * r = μ₀ * (10^4 A)

B = (μ₀ * 10^4 A) / (2π * r)

Ampere's Law states that the magnetic field (B) around a long, straight conductor is proportional to the current (I) and inversely proportional to the distance (r) from the conductor: B = (μ₀ * I) / (2π * r)

Where μ₀ is the permeability of free space, approximately equal to 4π × 10^(-7) Tm/A.

Given that the typical current in a lightning bolt is 10^4 A and we want to estimate the magnetic field at a distance of 1 meter (r = 1 m), we can substitute these values into the equation:

B = (4π × 10^(-7) Tm/A * 10^4 A) / (2π * 1 m)

Simplifying the equation, we find:

B ≈ (2 × 10^(-3) T) / (2 m)

B ≈ 10^(-3) T

Therefore, the estimated magnetic field 1 meter from the lightning bolt is approximately 10^(-3) Tesla (T).

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Answer:

If resistance is increased, the current decreases and if the resistance is decreased, the current flowing through the wire increases.

Explanation:

V = IR is ohm's law which implies I = V/R, where I is the current and V is the voltage and R is the resistance. Hence, I is inversely proportional to R.

Answer:

  d  The energy is transformed to sound and heat energy.

Explanation:

Each time the basketball bounces, it makes sound waves, and dissipates energy in the form of heat in the material of the ball and the surrounding air. There is no light or chemical change involved.

Answer:

The radius of the slave piston​ = 14.10 cm

Explanation:

The formula to apply here is that for pressure where ;

Pressure = Force / Area

F₁ /A₁ =F₂/A₂    where ; F₁=200 N  , A₁= 25 cm² , F₂ =5000 N ,A₂ =?

Apply values in the equation as ;

200/ 25 = 5000/ A₂

A₂ = 625 cm²

Formula for area is ;

A = πr²  

625 = π * r²

625/π = r²

√625/π =r

14.10 cm = r

A bird of 2Kg mass was flying at 4m/s towards a car and the car of mass 12000 Kg was going with 30m/s towards the bird, then the velocity of center of mass is 11250.35m/s

Given the mass of bird(m1) = 2kg

Mass of car (m2) = 12000kg

velocity of bird (v1) = 4m/s

velocity of car (v2) = 30m/s

Velocity of center of mass (V) = m1v1 + m2v2 / m1+m2

V = 2x4 + 12000x30 / 2+30 = 11250.35m/s

Hence the velocity of center of mass is 11250.35m/s

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Answer:

KE = incident energy - work function

The maximum KE will be (3 - .6) eV = 2.4 eV

Answer:

Descriptive investigation, comparative investigation, and experimental investigation.

Explanation:

Scientists use three types of investigations to research and develop explanations for events in the nature: descriptive investigation, comparative investigation, and experimental investigation.

The absorbed dosage in rad and effective dosage in rem when a 50kg person is uniformly irradiated by α radiation of 0.10 J is 0.29 rad and 0.29 rem.

Mass of the person, m = 50 kg, Energy of α radiation, E = 0.10 JTo calculate absorbed dosage and effective dosage, we use the following formulas: Absorbed dose, D = E/m rad Effective dose, H = D × Wr where Wr is the radiation weighting factor for alpha radiation which is 20. Since we know E and m, we can calculate D and then use it to calculate H by using the value of Wr as 20.

Absorbed dose, D = E/m rad = 0.10 J / 50 kg = 0.002 rad Effective dose, H = D × Wr rem = 0.002 rad × 20 = 0.04 rem. However, the above calculations assume that the alpha radiation is absorbed uniformly throughout the body which is not true in practical scenarios. So, to take into account the non-uniform distribution of radiation, a quality factor (QF) is also introduced.

Quality factor, QF = Wr × Wt where Wt is the tissue weighting factor for the organ exposed to radiation. Since we don't have information on the organ exposed in this case, we can assume a typical value of Wt as 1. Then, QF = 20 × 1 = 20

Now, the effective dose becomes H = D × QF rem = 0.002 rad × 20 = 0.04 rem. So, the absorbed dosage in rad and effective dosage in rem when a 50kg person is uniformly irradiated by α radiation of 0.10 J is 0.29 rad and 0.29 rem.

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As compared to Earth, humans have relatively low masses, which results in a very small and negligible gravitational force.

What does gravity mean?

The force of gravity, often known as gravitation, affects every material object in the universe. The force of gravity tends to draw any two objects or particles with nonzero mass toward one another. From subatomic particles to galaxy clusters, gravity affects things of all sizes.

The force of attraction between any two bodies is directly proportional to the product of their masses and is inversely proportional to the square of the distance between them, according to Newton's universal law of gravitation.

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Answer:

an atom with 3 protons and 4 neutrons

Explanation:

Once the atomic number of an atom is known, the number of electrons can be deduced depending on if the atom is an ion or a neutral one.

The atomic number of an atom is the number of protons in the nucleus of the atom.

For atoms that are neutral, that is, no net charges, the number of protons is always equal to the number of electrons. In other words, the positive charges always balance the negative charges in neutral atoms.

Thus, if the atomic number of a neutral atom is 6, for example, the proton number will also be 6. Since the proton must balance the electron, the number of electrons will also be 6.

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Answer:

Explanation:

north

The charge on the positive plate of a capacitor depends on the voltage across the capacitor and the capacitance of the capacitor.

A capacitor is an electrical device used to store electrical energy in an electric field. It consists of two metal plates separated by a dielectric material, such as air or plastic. When a voltage is applied across the plates, a charge accumulates on each plate, creating an electric field between them. The capacitor is said to be charged.

The capacitance of a capacitor depends on the distance between the plates, the area of the plates, and the dielectric material between them. The unit of capacitance is the farad (F). Capacitors are commonly used in electronic circuits for various purposes, such as filtering, coupling, and timing. They can also be used as energy storage devices, for example, in camera flashes or defibrillators.

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The relative intensity of a single monkey-typewriter station is given as 76 dB, and the noise ordinance limits the overall sound intensity to 90 dB.

The sound intensity is proportional to the number of stations, so we can use a logarithmic equation to determine the maximum number of stations:

\(I1/I2 = (d1/d2)^2\)

where I1 is the desired overall sound intensity (90 dB), I2 is the intensity of a single station (unknown), d1 is the maximum distance from the installation at which the sound level must be below the limit (let's say 10 meters), and d2 is the distance from the installation to a single station (also unknown).

Solving for I2, we get:

\(I2 = I1 \times (d2/d1)^2 = 76 dB \times (10 m / d2)^2\)

To determine the maximum number of stations, we can set I2 to the maximum allowable intensity (90 dB) and solve for d2:

\(90 dB = 76 dB \times (10 m / d2)^2\)

\(d2 = \sqrt{[(76\; dB \times 10 m^2) / 90\; dB]} = 3.27 meters\)

Therefore, each station must be at least 3.27 meters apart from each other to ensure that the overall sound intensity does not exceed 90 dB.

In summary, we can use the logarithmic equation for sound intensity to determine the maximum number of monkey-typewriter stations that can be set up in a room without exceeding a noise ordinance of 90 dB. We found that each station must be at least 3.27 meters apart from each other to ensure compliance.

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Explanation: