Estimate the difference in air pressure between the top and the bottom of the Empire State building in New York City? It is 380 m tall and is located at sea level. Express as a fraction of atmospheric pressure at sea level.Express your answer using two significant figures.

Answer:

wood ,clay brick ,aluminum, and copper.

Explanation:

Three examples of types of material that would be used when building houses where their thermal conductivity are copper, aluminum, fire brick, and carbon steel.

Thermal conductivity is the rate at which heat is transferred from one object to another by conduction over a material's unit cross-section area.

Therefore, a substance's thermal conductivity will decrease as the distance between its atoms increases.

This is because a substance's molecules will move more randomly with the greater distance between them, which will lead to less efficient energy transfer. Metals have a much higher heat conductivity than liquids.

Therefore, copper, aluminum, fire brick, and carbon steel are three examples of materials whose heat conductivity would be employed for constructing homes.

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Answer:

The greater the amplitude the greater the energy.

(Think of a water wave - which carries greater energy a 1 ft wave or

a 10 ft wave)

Answer is the hind brain

The brainstem is located under the forebrain and midbrain. Therefore option D is correct.

The brainstem is located under both the forebrain and midbrain. It is a vital component of the central nervous system that connects the brain to the spinal cord and controls many essential functions such as breathing, heart rate, and digestion.

It consists of three main regions: the medulla oblongata, pons, and midbrain. The forebrain, midbrain, and hindbrain together constitute the major divisions of the brain.

The hindbrain is positioned below the midbrain and includes structures like the cerebellum, pons, and medulla oblongata.

The brainstem, specifically its lower regions, is responsible for relaying information between the brain and the rest of the body while regulating critical bodily functions.

Therefore option D is correct.

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Answer:

\(f = mg \\ = 70 \times 9.8 = |f| \)

Answer:

at max height you potential energy is highest

Explanation

At your maximum height, your potential energy is highest.  

And at your exact peak, your kinetic energy is zero, which is the lowest it can ever be.

Answer:

friction doesn't let the desk move.

Explanation:

the law of motion states any object in motion should stay in motion.

The mass of the parachutist doesn't decrease to 0 kg. It is still 70 kilos and always will be. The parachutist's mass is constant at 70 kg regardless of where they are on Earth, in free fall, or in outer space. Mass remains constant.

You might be considering how the parachutist loses all sense of weight while falling. That's accurate. When they fall freely to the Earth, their weight will be nil (or any other body).

The problem is that mass and weight are two different concepts. Your scales here on Earth confuse you by displaying kilograms (kg). They are actually gauging your weight, which is expressed in Newtons and is, in essence, the downward force your mass experiences as a result of the Earth's gravity.

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Answer:

We can use conservation of momentum and conservation of energy to solve this problem.

Conservation of momentum:

Initial momentum = final momentum

m1v1 + m2v2 = (m1 + m2)v'

where m1 = 20 g = 0.02 kg, v1 = 10 m/s, m2 = 40 g = 0.04 kg, v2 = 0, v' is the final velocity of both balls after collision.

Solving for v':

v' = (m1v1 + m2v2)/(m1 + m2)

v' = (0.02 x 10 + 0.04 x 0)/(0.02 + 0.04)

v' = 6.67 m/s

Conservation of energy:

Initial kinetic energy = final kinetic energy

(1/2)m1v1^2 + (1/2)m2v2^2 = (1/2)(m1 + m2)v'^2

where v' is the final velocity calculated from conservation of momentum.

Solving for the total change in kinetic energy:

ΔKE = (1/2)(m1v1^2 + m2v2^2) - (1/2)(m1 + m2)v'^2

ΔKE = (1/2)(0.02 x 10^2 + 0.04 x 0^2) - (1/2)(0.02 + 0.04) x 6.67^2

ΔKE = -0.518 J

Therefore, the answer is (E) -518 x 10^-1.

SW2 (config-if-range)channel-group 1 mode desirable. Ether-channel is made by combining multiple physical links that are seen as one link between two switches.

The possible combination to establish an ether-channel between SW1 and SW2 using LACP or PAgP .Ether-channel is a port link aggregation technology or port channel architecture used primarily on Cisco.

Ether-channel is used for providing fault tolerance and high-speed links between switches, routers and servers. To form an Ether-channel there are 2 protocol and link aggregation control protocol. Also load balances traffic across links in the bundle. Traffic is not necessarily distributed equally among all the links. Ether-channel will double or quadruple your bandwidth.

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We can see that the time required for the current to reach one-half of its final value \((\(t_{\frac{1}{2}}\))\) is directly proportional to the ratio of inductance to resistance \((\(\frac{L}{R}\))\). Therefore, the correct answer is C. Directly proportional to \(\(L/R\)\).

To analyze the circuit and find the time required for the current to reach one-half its final value, we can use the concept of the time constant in an RL circuit.

The time constant \((\(\tau\))\) of an RL circuit is given by the formula:

\(\[\tau = \frac{L}{R}\]\)

Where:

\(\(L\)\) is the inductance of the coil (in Henries, H).

\(\(R\)\) is the resistance of the circuit (in ohms, Ω).

The time constant represents the time it takes for the current in the circuit to reach approximately 63.2% of its final value.

When the switch S1 is closed, the current in the RL circuit will start to flow. The current \((\(I\))\) in the RL circuit at any time \(\(t\)\) is given by the formula:

\(\[I(t) = I_{\text{max}} \left(1 - e^{-\frac{t}{\tau}}\right)\]\)

Where:

\(\(I_{\text{max}}\)\) is the maximum current that the circuit will reach.

Now, we want to find the time \((\(t_{\frac{1}{2}}\))\) required for the current to reach one-half \((\(\frac{1}{2}\))\) of its final value \((\(I_{\text{max}}\))\).

Let's assume the final current \((\(I_{\text{max}}\))\) is 1 unit (arbitrary value for simplicity). So, we need to find \(\(t_{\frac{1}{2}}\)\) when \(\(I(t_{\frac{1}{2}})\) = \(\frac{1}{2}\)\).

\(\[\frac{1}{2} = 1 \left(1 - e^{-\frac{t_{\frac{1}{2}}}{\tau}}\right)\]\)

Now, we can solve for \(\(t_{\frac{1}{2}}\)\):

\(\[e^{-\frac{t_{\frac{1}{2}}}{\tau}} = \frac{1}{2}\]\\\\\\frac{t_{\frac{1}{2}}}{\tau} = \ln\left(\frac{1}{2}\right)\]\\\\\t_{\frac{1}{2}} = \tau \cdot \ln\left(\frac{1}{2}\right)\]\)

Now, substitute the expression for \(\(\tau = \frac{L}{R}\)\):

\(\[t_{\frac{1}{2}} = \frac{L}{R} \cdot \ln\left(\frac{1}{2}\right)\]\)

We can see that the time required for the current to reach one-half of its final value \((\(t_{\frac{1}{2}}\))\) is directly proportional to the ratio of inductance to resistance \((\(\frac{L}{R}\))\). Therefore, the correct answer is C. Directly proportional to \(\(L/R\)\).

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Answer:

So 55 Newtons are needed.

Answer:

80 N

Explanation:

mass (m) = 20kg

acceleration (a) = 4m/s^2

Force (F) = ?

.°. F = ma

= 20 × 4 = 80

.°. F = 80 N

Thus, The Force is needed to accelerate a 20 kg mass at a rate of 4 m/s^2 is 80 N

-TheUnknownScientist

Answer:

A balance and a beaker of water!

Explanation:

Krishne wants to measure the mass and volume of a key. The tools that are to be used are – a balance and a beaker of water.

Mass will be represent with the amount of matter that is in an object. This will be measured in terms of kilogram. The mass can easily be measured with balance.

Volume is the quantity of matter that is in the object. This is measured in terms of cubic meter. If you drop the key in a beaker of water, the water inside the beaker will increase and this increases the volume of water that will be equal to volume of key.

Ionic bond is formed when one atom accept electron and the other atom loses electron.

Donates electrons is the description that best explains an ionic bonding because in ionic bonding, one atom loses electron and the other atom accept that electron in order to gain stability.

So we can conclude that donates electron is the correct answer.

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Answer:

Civil law deals with behavior that constitutes an injury to an individual or other private party, such as a corporation. Examples are defamation (including libel and slander), breach of contract, negligence resulting in injury or death, and property damage.

Explanation:

Answer:

the filling stops when the pressure of the pump equals the pressure of the interior air plus the pressure of the walls.

Explanation:

This exercise asks to describe the inflation situation of a spherical fultball.

Initially the balloon is deflated, therefore the internal pressure is equal to the pressure of the air outside, atmospheric pressure, when it begins to inflate the balloon with a pump this creates a pressure in the inlet valve and as it is greater than the pressure inside, the air enters it, this is repeated in each filling cycle, manual pump.

When the ball is full we have two forces, the one created by the external walls and the one aired by the pressure of the pump, these forces are directed towards the inside, but the air molecules exert a pressure towards the outside, which translates into a force. When these two forces are equal, the pump is no longer able to continue introducing air into the balloon.

Consequently the filling stops when the pressure of the pump equals the pressure of the interior air plus the pressure of the walls.

Answer:

for students to do nothing

Explanation:

because doing nothing is not a course goal

Answer:

Voltage V = 117.65 volts

the voltage across the light bulb's filament is 117.65 V

Explanation:

The power of a light bulb can be expressed with respect to voltage and current flow.

Power = voltage × current

P = VI

Making Voltage V the subject of formula;

V = P/I

Given;

Power P = 4.0W

Current I = 0.034A

Substituting the given values;

V = 4/0.034

V = 117.65 volts

Answer:

Maximum pressure = 4450 N/m²

Explanation:

We'll begin by calculating the volume of the block. This can be obtained as follow:

Volume (V) = 5 cm × 3 cm × 2 cm

V = 30 cm³

Next, we shall determine the mass of the block. This can be obtained as follow:

Density = 8.9 g/cm³

Volume = 30 cm³

Mass =?

Density = mass /volume

8.9 = mass / 30

Cross multiply

Mass = 8.9 × 30

Mass = 267 g

Next, we shall covert 267 g to Kg.

1000 g = 1 Kg

Therefore,

267 g = 267 g × 1 Kg / 1000

267 g = 0.267 Kg

Thus, the mass of the block is 0.267 Kg

Next, we shall determine the force.

Force of gravity (g) = 10 N/Kg

Mass (m) = 0.267 Kg

Force (F) =?

F = mg

F = 0.267 × 20

F = 2.67 N

Next, we shall determine the minimum area since we are trying to obtain the maximum pressure. This can be obtained as follow:

Minimum area = 3 cm × 2 cm

Covert each measurement to metre (m) by dividing each measurement by 100

Minimum area = 0.03 m × 0.02 m

Minimum area = 0.0006 m²

Finally, we shall determine the maximum pressure. This can be obtained as follow:

Force (F) = 2.67 N

Minimum area = 0.0006 m²

Maximum pressure =?

Maximum pressure = Force /minimum area

Maximum pressure = 2.67 / 0.0006

Maximum pressure = 4450 N/m²

Answer:

four covalent bonds is the answer

Answer:

the answer to this question is A globular cluster

water is not found in the periodic table.

water has a lot of empty space.

I think that's it I know those to are true.

The statements that are true about water are as followings,

Water does not appear on the periodic table of elements.

Water molecules contain a lot of empty space.

Hydrogen and oxygen have different properties when separated.

Therefore the correct options are options B, C, and E.

A chemical compound is a combination of two or more either similar or dissimilar chemical elements.

For example, H₂O is a chemical compound made up of two oxygen atoms and a single hydrogen atom.

The periodic table contains only elements therefore water cannot be found on the periodic table , oxygen and hydrogen would have different properties when separated.

Thus , the correct options are B, C, and E.

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Answer:

atlanta

Explanation:

just took the test

The reference point in this scenario is Atlanta.

The can be described as the starting point of the entire journey.

From the given statements the family started the journey from Atlanta and then traveled to Baltimore.

Atlanta is the start point (reference point) while Baltimore is the destination (finishing point).

Thus, the reference point in this scenario is Atlanta.

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Answer:

To solve this problem, we can use the formula for the potential energy stored in a stretched spring or rubber band: U = (1/2) k x^2

where U is the potential energy, k is the spring constant, and x is the amount of stretch.

We can rearrange this formula to solve for k: k = 2 U / x^2

The velocity of the pebble can be found using conservation of energy:

(1/2) m v^2 = U

where m is the mass of the pebble and v is its velocity.

Rearranging this formula, we get: v = sqrt(2 U / m)

We can combine these formulas to solve for the length of the rubber band:

k = (4 U) / (0.25 L^2)

v = sqrt((8 U) / (0.006))

where L is the original length of the rubber band.

Since the width and thickness of the rubber band are given, we can calculate its cross-sectional area:

A = (9 mm) x (1.55 mm) = 13.95 mm^2 = 1.395 x 10^-5 m^2

Using the Young's modulus given in the problem, we can calculate the spring constant: k = (A / L) x (Y / 4)

where Y is the Young's modulus.

The formula for k above, we get: (4 A Y / L^3) x (U / 0.25) = 0.006 v^2

Solving for L, we get: L = (4 A Y U / 0.006 v^2)^1/3

Substituting the given values and solving, we get: L = 34.86 cm

Therefore, the length of the rubber band should be approximately 34.86 cm to achieve the desired velocity of the pebble

Answer:

4. y = 2.38333t - 26.55 is the answer.

The angle subtended by the moon is about the same as the angle subtended by the sun. The angle subtended by the sun and the moon are important parameters for understanding total solar eclipse.

An observer on Earth compares the angle subtended by the moon to the angle subtended by the sun. The sun is much farther away from the earth, and as a result, appears much smaller than the moon. The diameter of the sun is approximately 400 times greater than that of the moon. By coincidence, the sun is also about 400 times farther from the Earth than the moon. This makes the sun and the moon appear almost the same size as Earth.

The diameter of the sun is about 400 times greater than that of the moon. Also, the sun is about 400 times farther from the Earth than the moon. Due to this coincidence, the sun and the moon seem to be about the same size as the Earth. The angle subtended by the moon is about the same as the angle subtended by the sun. During a total solar eclipse, the angle subtended by the moon to the observer on the earth is roughly equal to that subtended by the sun. Therefore, the moon will completely cover the sun’s disk. A total solar eclipse occurs when the new moon passes in front of the sun, hiding the sun's disk from Earth viewers. When the moon is in a new moon phase, it is at its closest position to the sun. Consequently, the moon can block the sun's light, creating a total solar eclipse.

The diameter of the sun and moon play a significant role in the occurrence of total solar eclipse. Due to the coincidence of the sun and moon being roughly the same size as the earth, the moon completely covers the sun's disk, causing a total solar eclipse.

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Larry's average speed, in km/h, can be calculated by dividing the total distance he ran by the time taken.

Average speed is a measure of the overall rate at which an object covers a certain distance. It is calculated by dividing the total distance traveled by the total time taken. The average speed is a scalar quantity, meaning it only has magnitude and no direction. It represents the overall "average" rate at which an object moves without considering the specific details of its motion. Larry ran 4 kilometers in 30 minutes. To calculate the average speed, we convert the time from minutes to hours by dividing it by 60. So, 30 minutes is equal to 0.5 hours.

Average speed = Total distance / Time taken

Average speed = 4 km / 0.5 hours

Dividing 4 km by 0.5 hours, we get:

Average speed = 8 km/h

Therefore, Larry's average speed is 8 km/h.

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When the wire's resistance is about 0.038 ohms and a 0.8 a current running through it, then power that the wire will use is 0.024 W.

We define power as the rate of doing work or can be said that it is the work done in unit time. The SI unit of power is Watt which can also be written as joules per second (J/s). Sometimes, power of motor vehicles and other machines is given in Horsepower (hp), which is approximately equal to 745.7 watts.

P= V *I

Given I= 0.8A and R= 0.038 ohms

V = IR

= 0.8*  0.038

= 0.0304 v

Power= V *I

= 0.0304 * 0.8

Power = 0.024 W

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Answer:

it is very hard but i am trying to help you.

Explanation: