A hiker sees a lightning flash; 18 s later he hears the sound of the thunder. Recalling from his study of physics that the speed of sound in air is approximately (1/3) km/s. Calculate the distance of lightning flash. [ Assume that speed of sound is negligible as compared to speed of light] (7 pts)

Answer:

MIRROR

Explanation:

Answer:

reflection of light is the bouncing back of light rats when it falls on a smooth surface or polish surface.

No, the elastic potential energy stored in the pole of a pole vaulter is not the only type of potential energy involved in pole-vaulting.

In pole-vaulting, there are multiple forms of potential energy involved. While the elastic potential energy stored in the pole plays a crucial role, other forms of potential energy include gravitational potential energy and kinetic energy.

1. Elastic Potential Energy: The pole used in pole-vaulting is typically made of flexible materials, such as fiberglass or carbon fiber, which store elastic potential energy when bent or compressed. This stored energy is then released, propelling the vaulter upwards.

2. Gravitational Potential Energy: As the vaulter reaches the highest point of their vault, they have gained gravitational potential energy due to their increased height above the ground. This potential energy is converted into other forms of energy as the vaulter descends.

3. Kinetic Energy: Throughout the vaulting process, the vaulter's body also possesses kinetic energy, which is the energy of motion. The vaulter's initial speed and subsequent acceleration contribute to their kinetic energy, allowing them to gain momentum and clear the bar.

Therefore, while the elastic potential energy stored in the pole is an important component, there are other forms of potential energy involved in pole-vaulting, namely gravitational potential energy and kinetic energy.

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Answer:Elas são ondas tridimensionais e transversais que viajam na velocidade da luz, transportando exclusivamente energia. Ademais, apresentam-se na forma de ondas de rádio, micro-ondas, infravermelho, luz visível, ultravioleta, raios x e raios gama, em ordem crescente de frequência e energia.

Explanation:

Answer:

Explanation:

Mass of sofa(m) = 105 kg

Force= 403 N

F = μ*N

Where:

F = friction force = 403 [N]

μ = static coefficient

N = Normal force [N]

The normal force of a body lying on a horizontal surface can be calculated by means of the product of mass by gravitational acceleration.

mass × acceleration due to gravity = 105 × 9.8  =  1029

403= μ *1029

substitute force with 403 N and resistance with 1029 × μ

                                    403 = 1029 × μ

                                         μ = 403/1029

                                            = 0.391

Answer = 0.391

Answer:

Gravity (please mark me as the brainiest)

Explanation:

Gravity is a force caused by a large body, such as the Earth. Gravity pulls objects toward the Earth.

And give me a thanks, or vote

It does not violate the principle of  relativity because the speed of the electron in water can explained as its relative speed with water.

The principle of relativity states that there is no physical way to differentiate between a body moving at a constant speed and an immobile body.

If the speed of light in water is 230Mm/s and an electron is moving through water at 250 Mm/s, it does not violate the principle of  relativity because the speed of the electron in water can explained as its relative speed with water.

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Answer:

Energy is: the ability to do work

The formula for energy is: power x time = energy

Explanation:

Hope this helps (there isn't really an explanation)

Answer:

b,d,f

Explanation:

Answer:

Ingles porfavor

Explanation:

Answer:

j type the question into wolfram it gives you answer plus explanation

It's important to note that this is a general explanation and that specific values and calculations may vary. Remember to always check your units and double-check your calculations to ensure accuracy.

To determine the energy stored in a capacitor, we can use the formula:

E = (1/2) * C * V^2

where E is the energy stored in the capacitor, C is the capacitance, and V is the voltage across the capacitor.

In this case, the capacitance (C) is given as 5μF (microfarads) and the capacitor voltage (V) is given by the function:

V(t) = 1.5 - 1.5e^(-75t)

To find the energy stored in the capacitor, we need to integrate the power function over time. The power in a capacitor is given by:

P(t) = V(t) * I(t)

where P(t) is the power at time t and I(t) is the current at time t. Since the initial stored energy is 0J, we can assume that the capacitor is initially uncharged.

To find the current (I) through the inductor, we can use Ohm's law:

V = L * (dI/dt)

where V is the voltage across the inductor, L is the inductance, and dI/dt is the derivative of the current with respect to time.

In this case, the inductance (L) is given as 0.25H and the voltage across the inductor (V) is given by the function:

V(t) = 12.0 * cos(120πt)

To find the current through the inductor, we can rearrange Ohm's law and integrate both sides:

(dI/dt) = V(t) / L

Integrating both sides with respect to t, we get:

I(t) = (1/L) * ∫[V(t)] dt

Using the given voltage function, we can substitute it into the integral and solve for I(t).

I(t) = (1/L) * ∫[12.0 * cos(120πt)] dt

By evaluating the integral, we can find the current as a function of time.

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Answer:

The retina comprises of rod and cone cells . The rod cells are responsible for black and white vision and require low light levels while the cone cells are responsible for color vision and require good/high light levels for better functioning.

When faint stars are looked at on the edges of the vision it allows more light from faint objects to strike the rod cells which then becomes more visible.

To calculate the work done in lifting a barbell, we can use the formula:

Work = Force × Distance

Let's assume that the work done in lifting the original barbell is represented by W1, the weight of the original barbell is represented by W, and the distance lifted is represented by D.

Since the work done is directly proportional to the weight of the object, if we have a barbell that is twice as heavy, the weight of the second barbell would be 2W.

Now, let's calculate the work done in lifting the second barbell.

Work2 = Force2 × Distance

Since the distance lifted is the same, we can keep it as D. Therefore, we have:

Work2 = (2W) × D

Simplifying this expression, we get:

Work2 = 2(W × D)

So, the work done in lifting a barbell that is twice as heavy the same distance is twice the work done in lifting the original barbell.

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Answer:

D) 1 & 2

Explanation:

Ice melting can be refrozen and although the pencil breaks, it doesn't change the chemical formula of the pencil

The distance between the two objects is 1.5 cm.

To calculate the distance between the two objects, we use the formula obtained from Columb's law

Columb's law states that the force of attraction or repulsion between two charges is directly proportional to the product of the charges and inversely proportional to the square of the distance between them.

Formula:

Where:

Make r the subject of the equation

From the question,

Given:

Substitute these values into equation 2

Hence, The distance between the two objects is 1.5 cm.

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The magnitude and direction of the resulting net force is 141.42 N.

The magnitude and direction of the resulting net force is calculated by applying the following formula as follows;

Mathematically, the formula for magnitude of force is given as;

F = √ ( Fy² + Fx²)

where;

The magnitude and direction of the resulting net force is calculated as;

F = √ ( Fy² + Fx²)

F = √ (100² + 100²)

F = 141.42 N

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To classify the processes as possible, impossible, or indeterminate, we need to analyze the entropy change equation: (Entropy Change) = (Entropy Transfer) + (Entropy Production).

a) Possible: If both the entropy transfer and entropy production are non-zero, it is possible to have an entropy change.

b) Impossible: If there is no entropy transfer or entropy production, the entropy change would be zero. Thus, it is impossible for the process to have an entropy change.

c) Indeterminate: If only the entropy transfer or entropy production is given, but not both, we cannot determine the entropy change without complete information. The process would be indeterminate.

d) Possible: If either the entropy transfer or entropy production is zero but the other term is non-zero, it is still possible to have an entropy change.

e) Possible: If both the entropy transfer and entropy production are zero, the entropy change would be zero. Thus, it is possible for the process to have an entropy change of zero.

It's important to consider that this classification is based solely on the given equation and does not take into account other factors specific to the processes in question.

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To determine the amount of work done by the tension in the ropes as the child swings from the initial position to the bottom, we would need more detailed information such as the weight of the child, the length of the ropes, and the angle at which the child swings. Without this information, it is impossible to provide a specific answer.

You need to follow these steps:

1. Identify the initial position and the bottom position of the child on the swing.
2. Calculate the displacement of the child during the swing (change in vertical height from the initial position to the bottom position).
3. Determine the tension force in the ropes. This force is equal to the weight of the child (mass × acceleration due to gravity) when the swing is at its lowest point.
4. Calculate the angle between the tension force and the displacement vector.
5. Calculate the work done by the tension in the ropes using the formula: Work = Force × Displacement × cos(angle)

Keep in mind that if the angle between the tension force and the displacement vector is 90 degrees, the work done by the tension in the ropes will be zero, as the tension force is acting perpendicular to the displacement of the child.

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Answer:

It has 11 electrons 23_11=11

The distance should be one third of the friction for easy lifting of rock.

m2=mass of the bar

m1= mass of the ball

l= length of the bar

setting clockwise to be the positive direction

Ʃτ=0→ m1gx+m2g(l/2)

To resolve the x-

x=-m2(l/2)/m1

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The friction force that is exerted on the car's rotating wheels causes an imbalanced force to be applied to the vehicle, which then accelerates. The center of the circle the car is turning is the target of both the unbalanced force and the acceleration. Your body, however, continues to move and is in motion.

An object's motion may vary if an imbalanced force is applied to it. The small car will alter speed, direction, or even halt if a heavier, faster toy car moves into its path or along its side. The small toy car is being subjected to a stronger force, which is why its motion has changed.

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Answer:

Environment

Explanation:

Your Environment, More Than Genetics, Determines Your Immune Health. When it comes to immunity, the environment you grow up in, or how you were 'nurtured' , is more important than nature, a new study suggests. Particularly as you get older.

The force the person must apply to exert a torque of -17 N·m is approximately 110.84 N. Torque (τ) is calculated as the product of the force applied (F) and the lever arm (r).

The force the person must apply to exert a torque of -17 N·m can be calculated using the given parameters: the angle θ = 30° and the length of the wrench r = 31 cm.

Torque (τ) is calculated as the product of the force applied (F) and the lever arm (r), where the lever arm is the perpendicular distance from the axis of rotation to the line of action of the force. In this case, the torque is given as -17 N·m, which indicates that the direction of the torque is opposite to the direction of the force.

Using the equation τ = r * F * sin(θ), we can rearrange it to solve for the force F:

F = τ / (r * sin(θ))

Substituting the values, we have:

F = -17 N·m / (0.31 m * sin(30°))

Evaluating this expression, the force the person must apply to exert a torque of -17 N·m is approximately 110.84 N.

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(a) The corresponding velocity potential is -4y x -2x + f(t). (b) Bernoulli equation can be applied if the flow satisfies certain conditions: steady, inviscid, and incompressible.

Q6: The estimated speed of sound in the pipe is 368.9 m/s.

a) The velocity potential (\(\phi\)) can be obtained by taking the negative partial derivatives of the stream function (Y) with respect to x and y. In this case, the stream function \(Y = 2y^2 - 2x + 5\). Taking the partial derivatives:

\(\partial \phi /\partial x = -\partial Y/\partial y = -4y\\\partial\phi /\partial y = \partial Y/\partial x = -2\)

Thus, the corresponding velocity potential is \(\phi = -4y x -2x + f(t)\), where f(t) is an arbitrary function of time.

b) The Bernoulli equation relates the pressure, velocity, and elevation along a streamline in a fluid flow. It can be applied if the flow satisfies certain conditions: steady, inviscid, and incompressible. The given flow field does not provide information about the velocity or elevation, so cannot determine if the flow satisfies these conditions. Therefore, cannot conclusively state whether the Bernoulli equation can be applied to this flow without additional information.

Q6) For calculating the speed of sound, use the adiabatic equation:

\(v = (y * R * T)^{0.5}\)

Where v is the speed of sound, y is the heat capacity ratio (1.4 for carbon dioxide), R is the gas constant (188 m/(s.K) for carbon dioxide), and T is the temperature in Kelvin.

First, convert the temperature from Celsius to Kelvin:

\(T(K) = T(^0C) + 273.15\)

T(K) = 300 + 273.15 = 573.15 K

Next, substitute the given values into the equation:

\(v = (1.4 * 188 * 573.15)^{0.5}\)

v ≈ 368.9 m/s

Therefore, the estimated speed of sound in the pipe is approximately 368.9 m/s.

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Without calibration, the data would no longer be accurate since it would deviate from real values. Therefore, calibration is occasionally required.

It converts an applied mechanical force—such as load, weight, tension, compression, or pressure—into another physical variable—in this case, an electrical output signal—that can be measured, converted, and standardized. The electrical signal changes in direct proportion to the force acting on the sensor.

A load cell or weight sensor is often referred to as a force sensor. They are employed to gauge load, strain, and compression. A lot of them contain internal strain gauges that are attached to the metal structure and respond even to the smallest compression changing the resistance and reporting on the outcomes.

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The correct answer is option A.

The Gamma waves emitted from radioactive decay have a frequency of around 10¹⁹ Hz, which is much greater compared to the alpha of beta waves.

The frequency is directly proportional to the energy of the waves as given by the equation,

Where E is the energy, h is the Planck's constant, and f is the frequency.

Thus the gamma waves have a lot of energy compared to the other options.

Thus the correct answer is option A.

The most dominant sense for human tends to be vision, though the identity of 'Krueger' mentioned in the question isn't specified. Perceptions in artificial reality can be considered real in that they elicit real psychological responses, though they technically represent simulated environments.

1. Without providing specifics on who 'Krueger' is, it is challenging to answer this question accurately. Nonetheless, in the context of psychology and sensory perception, many psychologists have argued that vision tends to be humans' most dominant sense.

2. The perceptions that people have while in an artificial reality environment can indeed be considered 'real' to the extent that they create perceptual experiences and trigger responses in the brain. However, it's crucial to differentiate between the objective reality and the experience induced by artificial reality, which is technically a simulation. Especially in terms of emotional and psychological reactions, the experiences can be very real and profound.

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