The _____ number, a dimensionless parameter, is best described as the ratio of the molecular diffusion of momentum to the molecular diffusivity of heat.

Given data

*The weight of the box is W = 500 N

*The distance of the plank from the fulcrum is d = 5 m

*The given force at a distance from the fulcrum is D = 10 m

The minimum force is required to lift the box is given by the net torque as

Substitute the known values in the above expression as

Hence, the minimum force is required to lift the box is F = 250 N

ANYTHING that's dropped near the Earth's surface and isn't affected by air resistance falls 9.8 m/s faster at any time than it did 1 second earlier.

0.5 second after it was dropped with zero speed, it's falling at

(0.5) x (9.8 m/s)  =  4.9 m/s .

It makes no difference which building it was dropped from.

Option B is correct. It is more convenient to step up/down voltage for AC than DC.

The main reason why power companies use AC (alternating current) rather than DC (direct current) is that it is more convenient to step up or down the voltage of AC power using a transformer. Transformers work on the principle of electromagnetic induction and allow for efficient voltage conversion at high power levels, which is necessary for long-distance power transmission. In contrast, DC voltage cannot be efficiently converted with a transformer, and high-power DC transmission requires expensive and complex equipment. Additionally, AC power can be easily generated using rotating machines like turbines and generators, while DC generators are less efficient and more expensive to operate. Therefore, the convenience and efficiency of voltage conversion and power generation make AC a more practical choice for power transmission and distribution.

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Inert gases require high temperatures and pressures to react with other elements.

A gas is considered to be inert if, under a specific set of circumstances, no chemical reactions occur. The noble gases, formerly known as the inert gases, frequently do not react with a wide variety of substances as argon and neon (at normal conditions).

Because they contain a fully filled valence shell and an electronic configuration of ns²np⁶, inert gases do not react with other chemicals.

As a result, they are referred to as noble gases and are in the periodic table's group 18.

But under  high temperatures and pressures Inert gases react with other elements.

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In electrostatics, the electrical force between two charged objects is inversely related to the distance of separation between the two objects. Increasing the separation distance between objects decreases the force of attraction or repulsion between the objects.

hope this helped

Answer:

temperiture or annual wind speed.

Explanation:

Sometimes true it is

For example, if the skateboarder is moving down the ramp the motion is in the same direction as the net force. On the other hand, if the skateboarder moves up the ramp, the direction of motion is opposite to the direction of the net force. In general, there is no reason for the direction of motion to be in the same direction as the net force.

The pace at which speed changes is known as acceleration. Acceleration typically, but not always, indicates a change in speed. Because the direction of an object's velocity is shifting even while it follows a circular course, it continues to accelerate.

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Answer:

7.5m/s²

Explanation:

Acceleration is the change in velocity of a body with respect to time.

acceleration = change in velocity/time

a = Δv/t

a = v-u/t

v is the final velocity = 15.0m.s

u is the initial velocity = 0.0m/s

t is the time = 2.0s

Substituting the values to get a

a - 15-0/2

a = 15/2

a = 7.5m/s²

Hence the acceleration of the baseball is 7.5m/s²

To find the specific heat at constant volume of a gas, you need to measure the change in internal energy of the gas when it is heated at constant volume.

The specific heat at constant volume can then be calculated using the equation:

C_v = ΔU / mΔT

where ,

ΔU is the change in internal energy,

m is the mass of the gas, and

ΔT is the change in temperature.

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Answer:

Acceleration of one cyclist=\(2.67m/s^2\)

Yes, the acceleration is higher of another cyclist who accelerates from 0 to 30 m/s in 8 seconds.

Explanation:

We are given that

Initial velocity of one cyclist, u=0 m/s

Final velocity of one cyclist, v=8m/s

Time, t=3 s

Initial velocity of another cyclist, u'=0

Final velocity of another cyclist, v'=30m/s

Time, t'=8 s

We know that

Acceleration, \(a=\frac{v-u}{t}\)

Using the formula

\(a=\frac{8-0}{3}=\frac{8}{3}=2.67m/s^2\)

Acceleration of one cyclist=\(2.67m/s^2\)

Acceleration of another cyclist, a'=\(\frac{30-0}{8}m/s^2\)

Acceleration of another cyclist, a'=\(3.75m/s^2\)

Yes, the acceleration of another cyclist is higher than the cyclist which accelerates from 0m/s to 8m/s.

(a) When l = 2, the possible magnetic quantum numbers (mₑ) are -2, -1, 0, 1, and 2.(b) When l = 4, the possible magnetic quantum numbers (mₑ) are -4, -3, -2, -1, 0, 1, 2, 3, and 4.

(a) The magnetic quantum number (mₑ) represents the projection of the orbital angular momentum along a chosen axis. It takes on integer values ranging from -l to +l, including zero. When l = 2, the possible values for mₑ are -2, -1, 0, 1, and 2. These values represent the five different orientations of the orbital angular momentum corresponding to the d orbital.

(b) Similarly, when l = 4, the possible values for mₑ are -4, -3, -2, -1, 0, 1, 2, 3, and 4. These values represent the nine different orientations of the orbital angular momentum corresponding to the f orbital. The range of values for mₑ is determined by the value of l and follows the pattern of -l to +l, including zero.Therefore, when l = 2, the possible magnetic quantum numbers (mₑ) are -2, -1, 0, 1, and 2. And when l = 4, the possible magnetic quantum numbers (mₑ) are -4, -3, -2, -1, 0, 1, 2, 3, and 4.

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In an oscillator consisting of a spring and a block, the amount of kinetic energy reaches maximum when: A. The block passes over the equilibrium point.

In Science, kinetic energy can be defined as a type of energy that's possessed by a physical object or body, especially due to its motion or a change in velocity (acceleration).

This ultimately implies that, a physical object or body would gain more of kinetic energy as it falls back toward the Earth because it is in motion.

In an experiment that is based on an oscillator using both a spring and a block, the amount of kinetic energy that is possessed by the block would reach maximum when it passes over the equilibrium point.

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Complete Question:

In an oscillator consisting of a spring and a block, the amount of kinetic energy reaches maximum when:

The block passes over the equilibrium point.

The block is at maximum positive displacement from the equilibrium point.

The spring's extension is half of the amplitude of oscillation.

The spring is at maximum compression.

None of these.

Answer: See Below

Explanation:

A reflective glass mirror will reflect all the components of white light and not allow visible light to pass through.

A transparent glass block will allow light to pass through with some refraction.

Part A: Thrust acts on the right in the direction of motion. Gravity acts downward.

Part B:  The direction of air resistance is opposite to the direction of motion, which is shown towards the left. Gravity acts downwards.

Part A:

A free-body diagram for a car is as follows:

The direction of friction is opposite to the direction of motion, which is shown towards the left.
The diagram shows three forces acting on the toy car that is battery-powered, which is as follows:
The force due to friction is labeled as \(f_K\).

The force of thrust is labeled as \(f_T\). The force of gravity is labeled as \(f_g\).
Part B:

A free-body diagram for a rabbit is as follows:
The diagram shows three forces acting on the stuffed rabbit that is being pushed by a toy car that is battery-powered, which is as follows:

The direction of friction is opposite to the direction of motion, which is shown towards the right.
The force due to friction is labeled as \(f_K\). The force due to air resistance is labeled as fair. The force of gravity is labeled as \(f_g\).
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Answer:

What natural disasters could be associated with this storm in coastal regions?

• wave surges

• tides and tsunami.

What would be the best emergency action plan?

• Evacuation of the current residents.

What would be a safe evacuation route if needed?

• in the attachment

Answer:

Natural disasters that could be associated with this storm in coastal regions could include wave surges, tides, and tsunamis. The best emergency action plan under these circumstances would be the evacuation of residents in the at risk areas. The best evacuation routes depend on where residents and/or tourists are coming from. Residents north of I-164 should take 1-64 West, toward Richmond. Residents south of I-264 and oceanfront residents/tourists should take I-264 to 1-64 East, toward Suffolk.

Explanation:

Answer:

Its also know as atomic mass its the mass of isotopes.

Explanation:

relative atomic masses of sources in the local environment of the Earth's crust and atmosphere as determined by the atomic weight.

The average velocity of ladybug crawling up the wall, v = 0.1 m/s.

To find average velocity using the formula,

v = dx / dt

where,

v is average velocity

dx is distance

dt is time

So, putting the values

We have,

v = 1m / 10s

v = 0.1 m/s

The difference between the change in position or displacement (x) and the time intervals (t) during which the displacement occurs is known as average velocity. Depending on how the displacement is displaced, the average velocity may be positive or negative. Meters per second (m/s or ms-1) is the standard international unit for average velocity.

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An estimate of how much energy per year is needed for 1 gigawatt is approximately 31,536,000,000,000,000 joules (J) per year.

To estimate how much energy per year is needed for 1 gigawatt, we need to consider the unit of measurement for energy, which is joules (J).

A gigawatt is equivalent to 1 billion watts or 1,000,000,000 watts. To calculate the energy per year, we need to multiply this value by the number of seconds in a year.

There are 60 seconds in a minute, 60 minutes in an hour, 24 hours in a day, and 365 days in a year.

So, 1 gigawatt x 1 year = 1,000,000,000 watts x 60 seconds/min x 60 minutes/hour x 24 hours/day x 365 days/year

= 31,536,000,000,000,000 joules (J) per year

Therefore, approximately 31,536,000,000,000,000 joules (J) per year  is an estimate of energy needed for 1 gigawatt.

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Answer:

Yes

Explanation:

\(v = \frac{ds}{dt} \\ where \: we \: need \: to \: know \\ \: change \: in \: displacement \\ \: and \: the \: time \: taken\)

if you know the time it took an object to travel between two points and the position of the object at the points, then we can determine the object's instantaneous velocity by using the differential rate of the displacement function with respect to the time.

Instantaneous velocity =  \(\frac{dS}{dt}\)

The total displacement covered by any object per unit of time is known as velocity. It depends on the magnitude as well as the direction of the moving object.

velocity= displacement  / time taken

for instantaneous velocity =  \(\frac{dS}{dt}\)

Thus, If you know how long it took an item to go between two places and where it was when it got there, you can use the differential rate of the displacement function with respect to time to calculate the object's instantaneous velocity.

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To find the frictional force using the coefficient of friction, multiply the coefficient (μ) by the normal force (N). The coefficient of friction represents the ratio of the force of friction between two surfaces, while the normal force is the force pressing the surfaces together.

The resulting frictional force (Ff) can be calculated using the equation Ff = μ * N. It's important to consider that the frictional force acts in the opposite direction of the applied force or the tendency of motion.

Determine the coefficient of friction (μ): The coefficient of friction is a dimensionless value that represents the ratio of the force of friction between two surfaces to the normal force pressing them together. It depends on the nature of the surfaces in contact. The coefficient of friction is typically denoted as μ.

Identify the normal force (N): The normal force is the force exerted by a surface perpendicular to the contact surface. It is equal to the weight of the object or the force pressing the surfaces together.

Calculate the frictional force (Ff): The frictional force can be calculated using the equation:

Ff = μ * N

Multiply the coefficient of friction (μ) by the normal force (N) to obtain the frictional force (Ff).

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Answer: 44m/s

Explanation:

A 10-kg weight is suspended in air by strong cable, then there is no work done in suspending the weight as the weight suspended in the air  does not move or experience any form of displacement.

Only Mass = 10 kg is given and no displacement so there is no work done as Work done = force * distance

In Physics, work done is defined as the amount of energy transferred when body is moved over a distance due to the action of external force.

The work done by a force is defined as the product of component of force in the direction of displacement and magnitude of this displacement.

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Answer:

B

Explanation:

Nonmetal is better insulator than metals

Answer:

B

Explanation:

Just took the quiz.

The change in potential energy can be determined by calculating the difference in potential energy between the two locations.

The gravitational potential energy (PE) between an object and the Earth is given by the formula PE = mgh, where m is the mass of the object, g is the acceleration due to gravity, and h is the height or vertical displacement. In this case, the change in potential energy (ΔPE) is given by ΔPE = PE_final - PE_initial.

To calculate the change in potential energy, we first need to calculate the potential energy at the initial location (PE_initial) and the potential energy at the final location (PE_final). The potential energy is directly proportional to the height or vertical displacement.

The vertical displacement can be calculated by finding the difference in the z-coordinates of the two locations: Δz = final_z - initial_z.

By substituting the given values into the formula for gravitational potential energy, we can calculate the change in potential energy (ΔPE) as ΔPE = m * g * Δz.

Considering the mass of 7 kg and the acceleration due to gravity near the Earth's surface, which is approximately 9.8 m/s^2, we can compute the change in potential energy.

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Answer:

Preoperational

Explanation:

According to Piaget's theory of cognitive development, the preoperational stage is the second stage. This stage includes children between the age group of 2 to 7 years. Children can understand conservation tasks and learn to manipulate various symbols during this stage.

So, the answer is the preoperational stage.

Answer:

B Preoperational

Explanation:

This is the answer the person above is correct!

This is for edge 2021/2022

Hope this helps!!

Answer:

the halfway point

Explanation:

As an object falls under the influence of gravity, kinetic energy and potential energy are equal at the halfway point only.

Answer:

D. Upward force on the shuttle

Explanation:

The hot gas from space shuttles released downward causes an upward force on the shuttle and propels it up the more.

Answer:

B.  10 m

Explanation:

f = v/λ = (20 m/s)λ / (5 m) = 4 Hz    original frequency

1/2(4 Hz) = 2 Hz   half the original frequency

(20 m/s) / λ = 2 Hz

λ = (20 m/s) / (2 Hz) = 10 m

The second wavelength would increase to 10 m

The force exerted on the eardrum at the bottom of a 2.9m deep water-filled pool is approximately 1.4 x 10^-3 N, taking into account the pressure of the water and the atmosphere.

The pressure at the bottom of the water-filled pool can be calculated using the formula P = rho * g * h, where rho is the density of water (1000 kg/m^3), g is the acceleration due to gravity (9.81 m/s^2), and h is the depth of the pool (2.9 m). Thus, P = (1000 kg/m^3) * (9.81 m/s^2) * (2.9 m) = 28410 Pa. The total force exerted on the eardrum is then the product of pressure and area: F = P * A = (28410 Pa) * (5.0 x 10^-5 m^2) = 1.4 x 10^-3 N. This force takes into account the pressure of the water as well as the atmospheric pressure.

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