How do ballerinas take advantage of conservation of momentum to turn?.

It would take 1.556 seconds for the barrier to crumple and safely slow down the person with a force of 1180 N.

To calculate the time required to crumple the barrier and safely slow down the person, we can use the concept of impulse.

The impulse, denoted by J, is defined as the product of force and time, and it represents the change in momentum of an object. In this case, the impulse required to safely slow down the person can be calculated using the maximum force and the person's initial momentum.

The momentum of a person is given by the product of their mass and velocity:

Momentum = mass × velocity

Given that the person's mass is 68 kg and their velocity is 27 m/s, the initial momentum is:

Initial momentum = 68 kg × 27 m/s

To safely slow down the person, the impulse provided by the barrier should be equal to the change in momentum.

Therefore, we have:

Impulse provided by barrier = Final momentum - Initial momentum

Since the person is brought to rest, the final momentum is zero. Thus, we have:

Impulse provided by barrier = -Initial momentum

Now we can express the impulse in terms of force and time:

Impulse provided by barrier = Force × Time

Plugging in the known values, we can solve for time:

-Initial momentum = Force × Time

68 kg × 27 m/s = 1180 N × Time

Simplifying the equation, we find:

Time = (68 kg × 27 m/s) / 1180 N

Evaluating the expression:

Time = 1836 kg·m/s / 1180 N

Finally, converting kg·m/s to seconds, we get:

Time ≈ 1.5559 seconds

Therefore, it would take approximately 1.556 seconds for the barrier to crumple and safely slow down the person with a force of 1180 N.

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The pressure acting on the top and bottom faces is\(0.1635 N/cm^2\), the pressure acting on the side faces is\(0.4905 N/cm^2,\) and the pressure acting on the front and back faces is \(0.981 N/cm^2.\)

To compute the pressure acting on each face of the rectangular block, we need to know the weight of the block and the area of each face.

The weight of the block can be calculated as follows:

Weight = Mass x Gravity

Weight = 0.3 kg x 9.81 \(m/s^2\)

Weight = 2.943 N

The area of each face can be calculated as follows:

Top and bottom face: length x width = 6 cm x 3 cm = 18 \(cm^2\)

Side faces: length x height = 6 cm x 1 cm = 6 \(cm^2\)

Front and back faces: width x height = 3 cm x 1 cm = 3\(cm^2\)

Now we can calculate the pressure acting on each face:

Top and bottom face: Pressure = Weight / Area = 2.943 N / \(18 cm^2\) = \(0.1635 N/cm^2\)

Side faces: Pressure = Weight / Area = 2.943 N / \(6 cm^2\) = 0.4905 \(N/cm^2\)

Front and back faces: Pressure = Weight / Area = 2.943 N / 3 cm^2 = 0.981 N/cm^2

Therefore, the pressure acting on the top and bottom faces is\(0.1635 N/cm^2\), the pressure acting on the side faces is\(0.4905 N/cm^2,\) and the pressure acting on the front and back faces is \(0.981 N/cm^2.\)

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Answer:

it's A and C I belive so when I looked it up

Answer: energy cannot be destroyed!

Explanation: It can't be destroyed since it can change from on form to another, but it can be increased or decreased.

To find the energy of a photon with a given wavelength, you can use the equation E = hc/λ, where E is the energy, h is Planck's constant, c is the speed of light, and λ is the wavelength.

Without knowing the specific wavelength provided in the question, it's not possible to calculate the energy in electron volts. However, as an example, let's assume the wavelength provided is 500 nm (nanometers). Using the equation E = hc /λ, we can calculate the energy as:

E = (6.626 x 10^-34 J s) x (2.998 x 10^8 m/s) / (500 x 10^-9 m)

E = 3.97 x 10^-19 J . To convert this energy to electron volts, we can use the conversion factor 1 eV = 1.602 x 10^-19 J:

E = (3.97 x 10^-19 J) / (1.602 x 10^-19 J/eV)

E = 2.48 eV

Therefore, a photon with a wavelength of 500 nm has an energy of 2.48 electron volts.

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Answer:

función sinusoidal

Explanation:

En un circuito de CA, la corriente y el voltaje tienen un voltaje máximo y mínimo. A intervalos regulares, la corriente y el voltaje invierten la dirección y cambian su magnitud continuamente con el tiempo.

Por lo tanto, para representar la corriente y el voltaje en un circuito de CA, se utiliza una función sinusoidal. Una función seno es una función continua con oscilaciones periódicas.

Answer:

No.

Explanation:

If there are no applied forces, normal force is usually equivalent to the weight of the object but if there are outside force (force that makes the object to move) especially if it's inclined, then the inclined force would then affect the normal force.

Answer:

Digestive = large instestine

respiratory = lungs

circulatory red blood cell

neurons=nerves

Explanation:

Answer:

Its B- overconfidence

Explanation:

The tendency to have more confidence in judgment and decisions than one should is called Overconfidence

Overconfidence  is a bias in which a person's subjective confidence is his or her judgement is reliably greater then the objective accuracy of those judgments when confidence is relatively high

Hence, The tendency to have more confidence in judgment and decisions than one should is called Overconfidence

correct answer : option B)Overconfidence

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The thunder and lightning happen at the same time but sound waves move more slowly than light waves. So if it takes longer for the sound to reach you, therefore the storm is farther away.

A sound wave is described as the pattern of disturbance caused by the movement of energy traveling through a medium such as air, water or any other liquid or solid matter as it propagates away from the source of the sound.

Sound waves are divided into three categories and they :

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Answer: c opinion is something ppl just suggest but a theory needs proof before it is confirmed

New observations support Hypothesis 1, as interactions between like and unlike charges follow expected attractive and repulsive behaviors.

Based on the observed interactions between like and unlike charged objects, it appears that the new observations do indeed add support to Hypothesis 1.

When like charges (similarly charged objects) come into proximity with one another, they exhibit repulsive behavior, causing them to move away from each other.

Conversely, when unlike charges (oppositely charged objects) come into contact, they display attractive behavior and move towards one another.

These observed phenomena align with our understanding of the behavior of charged objects and reinforce the validity of Hypothesis 1.

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Answer:3 go to 2 and 4 go to 4 and 1 go 2 2 go to 1

Explanation:

Answer:

Waves are caused by wind, or are created by the friction between wind and surface water

Explanation:

98.9°F is equivalent to 37.17°C temperature. Using Formula: °C = (°F - 32) x 5/9

To convert 98.9°F to Celsius (°C), you can use the following formula:

°C = (°F - 32) x 5/9

Substituting 98.9 for °F in the formula, we get:

°C = (98.9 - 32) x 5/9 = 37.17

Therefore, 98.9°F is equivalent to 37.17°C.

It's important to note that when converting Fahrenheit to Celsius, the resulting Celsius temperature is often more precise with decimal places. In this case, the Celsius temperature is 37.17°C, which means that the temperature is between 37°C and 38°C.

To double-check your conversion, you can also use online temperature conversion tools or smartphone apps that are readily available and accurate.

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Answer:

This can be explained by the equation Force=Mass x Acceleration. Vehicle 2 has a higher acceleration than Vehicle 1, which means it accelerates quicker. However, this increased acceleration is achieved by a less forceful engine. This is possible because Vehicle 2 has a lower mass than Vehicle 1, meaning the same force applied to Vehicle 2 results in greater acceleration. Therefore, Vehicle 2 has a greater acceleration than Vehicle 1 but has a less forceful engine.

The maximum emf induced in the coil by the Earth’s field when the coil takes 100 turns is 0.0124 v.

number of turns N = 100

  area A = 0.040 m²

  angular velocity ω = 1480 rev/min=1480 (2π/60 )rad/s = 154.98 rad /s

  magnetic field B = 2 ×10⁻⁵T

   the maximum emf induced in the coil by the Earth's field

                   ε = NBAω

               ε = ( 100  ) (2 × 10⁻⁵) (0.040  ) (154.98  )

                  = 0.0124V

Changes in magnetic flux are the most fundamental cause of an induced EMF. putting a moving current-carrying coil in a magnetic field that is both static and stable. This will cause an adjustment of the area vector and thus, EMF will be created.

an area where electromagnetic radiation produces electric and magnetic forces. EMFs from power lines, electrical appliances, wireless and cellular telephones, and other sources are being investigated for their potential to cause cancer or other adverse health effects. Additionally called electromagnetic field.

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Measuring 27ml of liquid using graduated cylinder, it is used to measures the volumes of liquids.

Long, thin vessels called graduated cylinders are used to measure liquid volume. They are not meant to be heated, stirred, or weighed. Graduated cylinders typically come in sizes between 5 and 500 ml. Some of them can even hold volumes greater than one liter.

With your eyes directly level with the liquid, place the graduated cylinder on a flat surface and measure the height of the liquid inside. The liquid will usually slant downward. The term "meniscus" refers to this curve. Read the measurement at the meniscus's bottom at all times.

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Fiber optic cable is the best medium that can withstand harsh environmental conditions due to its physical properties.  Fiber optic cable is made of glass or plastic fibers that are designed to transmit light signals over long distances at high speeds.

Unlike other types of cable, fiber optic cable is immune to electromagnetic interference and can operate effectively in harsh environments such as extreme temperatures, moisture, and corrosive environments. The cable's protective sheath provides additional protection against physical damage from impact, bending, or compression. Additionally, fiber optic cable is immune to electrical noise, which can disrupt the signal transmission of other cable types. Due to its resilience and reliability, fiber optic cable is the preferred medium for long-distance and high-bandwidth data transmissions in industries such as telecommunications, aerospace, and military applications.

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Answer:

\(f=6.97\times 10^{14}\ Hz\)

Explanation:

Given that,

Wavelength, \(\lambda=430\ nm=430\times 10^{-9}\ m\)

We need to find the frequency of the violet light.

We know that the relation between frequency and wavelength is given by :

\(f=\dfrac{c}{\lambda}\\\\f=\dfrac{3\times 10^8}{430\times 10^{-9}}\\\\f=6.97\times 10^{14}\ Hz\)

So, the frequency of violet light is \(6.97\times 10^{14}\ Hz\).

Answer:

4 times what it is now.

Explanation:

g=G(M/r^2)

G is constant, so ignore.

We have (1M/0.5r^2), or 4.

Answer:

4g

Explanation:

the equation of g (field gravity)

g = G M/R²

because G (Contant of Gravitasion) and M (Mass of earth) same, them

g2/g1 = R1²/R2²

g1 = g now

g2 = g which the value we looking for

g2/g = 1/(1/2)²

g2/g = 1/(1/4)

g2/g = 4

g2 = 4g

1) Newton first law of motion: state“If a body is at rest it reamain at rest and if it is in a motion it continu its motion unless a net external force acting on it”

This law also called law of inertia

2) Newton second law of motion: states that ‟acceleration to the force acting on the body and inversky proportional to the mass of the body”

3) Newton's third law of motion: It is not possible to exert a force abody with out the body exerting a forces in the opposite direction.

These forces are called action and reaction forces

hope it's helpful ❤❤❤❤❤❤

THANK YOU.

Answer:

B

Explanation:

The component of the force acting in the direction of an object's motion determines how much force is doing work on that object. The "parallel component" of the force is referred to as this.

A force that is applied perpendicular to an object's motion has no effect since it does not add to the object's kinetic energy.

It follows that the force exerted on the item will increase if the applied force's direction is adjusted to make it more parallel to the direction of motion.

The amount of force accomplishing work will decrease, on the other hand, if the direction of the applied force becomes increasingly perpendicular to the direction of motion.

Take the movement of a box across a rough surface as an illustration.

Only a fraction of the force will be parallel to the surface of the force delivered at a 45-degree angle to the surface, contributing to the motion of the box.

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Explanation:

The theory of speciation confirms what happens with fireflies, only fireflies that are part of the same species can reproduce among themselves, which means that fireflies that use pheromones as mating signals will attract fireflies that use that same form or mechanism of reproduction.

Some mechanisms that allow this type of differentiation or speciation to occur are: seasonal or geographic isolation and sexual isolation due to behavior or conduct.

Speciation allows the formation of new populations of organisms that share the same physiological and genetic characteristics. Therefore, the adult fireflies that shine as a mating signal are possibly found in the same geographical position and their physiological and genetic characteristics are compatible with those of his own species.

Answer: I think a

Explanation:

For 10-MeV neutrons, the difference in speeds between classical and relativistic kinematics is not large, but the relativistic kinetic energy must be used in order to be accurate.

Reactors are designed to sustain and control nuclear chain reactions for generating power, and in fission reactions, neutrons with energies up to 10 MeV are produced. These fast neutrons are used to initiate fission in the nuclei of fissionable materials. In order to calculate the velocity of neutrons, one must use the correct expression for kinetic energy.The classical kinetic energy expression, $KE=\frac{1}{2}mv^2$, is not valid for neutrons travelling at relativistic speeds. The relativistic energy expression for a particle with mass m and velocity v is $E=(mc^2)\sqrt{1-\frac{v^2}{c^2}}$, where c is the speed of light.In the case of 10-MeV neutrons, the difference in speeds between classical and relativistic kinematics is not large, but the relativistic kinetic energy must be used in order to be accurate.

Using the classical expression for kinetic energy would result in an error of less than 1%, but it is still important to use the correct expression when calculating the velocity of high-energy particles.

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A nickel atom has an atomic number of 28 and an atomic mass of 59. It has a central nucleus composed of 28 protons and 31 neutrons, surrounded by an electron cloud containing 28 electrons.

The atom consists of matter that may be split without releasing electrical charges.

It's also the smallest unit of matter with chemical element features. As a result, the atom is the fundamental unit of science.

In the nucleus, proton and the neutron is existing. The condition of the atom to be electrically neutral is that the number of the proton and electron should be the same.

A nickel atom has an atomic number of 28 and an atomic mass of 59. In the nucleus, proton and the neutron is existing,the atom is the fundamental part of the particle.

In that, condition, It has a central nucleus composed of 28 protons and 31 neutrons, surrounded by an electron cloud containing 28 electrons.

Hence, option A is correct.

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Length of the solenoid, l = 50.0 cm = 0.50 mA = 0.385 m²µ₀ = 4π x 10⁻⁷ H/m. L = (µ₀N²A)/lL = [4π x 10⁻⁷ H/m × (100)² × 0.385 m²]/0.50 mL = 7.87 x 10⁻⁴ H.  The induced emf in the solenoid when t=20.0 s is -4.13 V

a) Find the self-inductance of the solenoid.

A solenoid is a type of electromagnet, the wire coiled up such that it produces a magnetic field when electric current passes through it.

The self-inductance of the solenoid can be given by the formula:  

 L= (µ₀N²A)/

lwhere  µ₀ is the permeability of free space

N is the number of turns of the solenoid

l is the length of the solenoid

A is the cross-sectional area of the solenoid

Given that, Number of turns, N = 100

Length of the solenoid, l = 50.0 cm = 0.50 mA = 0.385 m²µ₀ = 4π x 10⁻⁷ H/m. L = (µ₀N²A)/lL = [4π x 10⁻⁷ H/m × (100)² × 0.385 m²]/0.50 mL = 7.87 x 10⁻⁴ H.

b) Find the induced emf in the solenoid when t = 20.0 s.

The induced emf (ε) can be calculated by the formula;

ε = -L dI/dt

where L is the self-inductance of the solenoid and dI/dt is the time rate of change of the current given by;    

I(t)=(5.00A)e^t/2.00s

Differentiating I(t) with respect to t gives;   dI/dt = 5e^t/2  V/s (Volts per second)Given that L = 7.87 x 10⁻⁴ HWhen t = 20.0s;  ε = - L dI/dt  = -7.87 × 10⁻⁴ H × (5e^20/2)  = -4.13 V

Therefore, the induced emf in the solenoid when t=20.0 s is -4.13 V.

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Answer:

it is somewhat frozen

Explanation: