It is proposed to work with a heating system, through extracting groundwater at 50 Fahrenheit to heat a house up to 70 Fahrenheit. Groundwater drops by 12 degrees Fahrenheit. The house demands 75,000Btu/h.
Calculate the minimum flow in lbm/h of water needed to complete this task.
Enter only the numerical value

The condition where a signal sent on one wire is received on another wire within the same connector is best described as NEXT (Near-End Crosstalk).

Near-End Crosstalk refers to the phenomenon where a transmitted signal from one wire interferes with the signal on an adjacent wire within a connector or cable. This interference occurs when the electromagnetic fields generated by one wire induce undesired voltages in nearby wires. In the context of data transmission, NEXT can lead to signal degradation and loss of data integrity. To mitigate NEXT, proper cable shielding, proper spacing between wires, and effective connector design are implemented. By reducing the crosstalk between adjacent wires, the quality and reliability of the transmitted signals can be improved. In summary, the condition described in the question is known as Near-End Crosstalk (NEXT).

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Answer:

9×1/2×10=45J

Explanation:

\(w = f \times d \times \cot( \beta ) \)

f=9N

d=10m

cos(B)=1/2

Answer:

I believe it's B.

Explanation:

The force that a magnet exerts on certain materials, including other magnets, is called magnetic force. The force is exerted over a distance and includes forces of attraction and repulsion. North and south poles of two magnets attract each other, while two north poles or two south poles repel each other.

The acceleration due to gravity at the surface of planet X is most nearly 4 m/s².

Gravity is a fundamental force of nature that attracts objects with mass or energy toward each other.

The acceleration due to gravity can be calculated using the formula: g = (G * M) / r², where g is the acceleration due to gravity, G is the gravitational constant, M is the mass of the planet, and r is the radius of the planet.

Given that the mass of planet X is one-tenth that of Earth and its radius is one-half that of Earth, we can substitute these values into the formula.

Let's assume the mass of Earth is Mₑ and the radius of Earth is rₑ. Therefore, the mass of planet X is Mₓ = Mₑ/10 and the radius of planet X is rₓ = rₑ/2.

Substituting these values into the formula, we have gₓ = (G * Mₓ) / rₓ². Simplifying this equation, we get gₓ = (G * (Mₑ/10)) / (rₑ/2)².

Since G, Mₑ, and rₑ are constants, we can simplify the equation further: gₓ = (1/5) * gₑ, where gₑ is the acceleration due to gravity on Earth.

Given that gₑ is approximately 9.8 m/s², we can substitute it into the equation to find gₓ: gₓ = (1/5) * 9.8 m/s² ≈ 1.96 m/s².

Rounding to the nearest whole number, the acceleration due to gravity at the surface of planet X is most nearly 4 m/s².

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Answer:

The trachea is one part of the respiratory tree, that is a conduit for air to pass through on its way to or from the alveoli of the lungs. This transmits oxygen to the body and removes carbon dioxide.

The bronchi are the airways that lead from the trachea into the lungs and then branch off into progressively smaller structures until they reach the alveoli, the tiny sacs that allow for the exchange of oxygen and carbon dioxide in the lungs.

Explanation:

Answer:

dont know

Explanation:

sorry man

A).  Her distance traveled was (700m + 500m) = 1,200 meters

B).  Her displacement was (700m north + 500m south) = 200 meters north

C).  Her average speed = (distance covered) / (time to cover the distance)

Speed = (1,200 meters) / (15 seconds)

Speed = 80 meters/second

(Layne is an incredible walker !  That's about 179 miles per hour.)

(She walks 700m in 10 seconds.  Usain Bolt runs only 100m in 10 seconds.)

D).  Her averge velocity = (displacement) / (time)

Velocity = (200 meters north) / (15 seconds)

Velocity = (13 and 1/3) m/s north

(This is only about 33% faster than Usain Bolt, if he went straight instead of doubling back, and if he could keep it up for 200 meters instead of only 100 meters.)

Answer:

The type of reaction represented by the model is an;

Exothermic reaction

Explanation:

Exothermic reaction reaction is a reaction that involves the giving off of excess energy as heat and or light by two or more reactants during a chemical reaction due to the higher combined energy of the reactants compared with the product

The analogy are;

The sponge balls are the reacting atoms

The water is the energy which they contain

The water given off is the excess energy which the compound formed by putting together the two soaked sponge balls is unable to hold.

Answer: 400 m

Explanation:

Vf= 20 + (4*10)

Vf= 60 [m/s]

x= (60^2 - 20^2) / (2*4)

x= 400 m

Answer:

C. Light does not need a medium to travel through, but since sound waves must have a medium to vibrate, sound is not created where no air is present.

Explanation:

The reason the bell is seen to vibrate but not heard is that unlike light, which does not require a medium to pass through, sound waves require an air-filled space in order to vibrate. Option C is correct.

A sound wave is produced when a medium begins to vibrate. When an entity vibrates, a pressure wave is formed, which causes sound.

Light does not need a medium to travel through, but since sound waves must have a medium to vibrate, the sound is not created where no air is present best describes why the bell is seen vibrating but not heard.

The complete question is attached.

Hence option C is correct.

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Answer:That only applies to highly polished surfaces, eg mirrors.

If you take a high quality laser (ie with low divergence) and aim it at a wall, you can see the spot where the laser beam reaches the wall from anywhere with a direct line-of-sight to the spot where the laser beam reaches the wall. This due to micro imperfections on the surface of the wall. At a microscopic level, the wall surface is very rough and pointing in all directions.

As to why, a beam of light bounces of a highly polished surface, I can only surmise that it is essentially due to kinematics, ie the only force opposing the light beam is normal to the surface, hence there no forces along the reflective surface. Since there are no forces along the reflective surface, the speed component of light along the reflective surface remains unchanged. However, on the plane perpendicular to the reflective surface the, the light photons bounce off at the same speed at which the hit the reflective surface because the mass of the reflective surface is much much much larger than the mass of the photons, which means that the reflective surface won’t move at all. Since conservation of momentum requires that momentum after the collision be the same as the momentum before the collision then the only way for that to happen is if the velocity of the photon perpendicular to the reflective surface is of exactly the same magnitude but in the opposite direction. Vector resolution of the speed component of the reflected beam means that the angle of reflection must be the same as the angle of incidence.

Explanation:

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Answer:

hahaha bisa aja ente gan di download di sini adalah salah satu

Answer:

yhnjienfjknijeanfijawenkwamfjkamenkgtama4eikoatgjj

Explanation:

ga4tgaew4gtaegae4gaegae5tatgaeata54aetgaetg

Answer: Carbohydrates , proteins and lipids are large molecules that are needed by the body for growth, repair and metabolism . They are found in our food. These molecules are too large to pass from the intestine into the blood, so digestive enzymes break them down into smaller molecules.

Explanation:

Answer:

Digestion is the mechanical and chemical break down of food into small organic fragments. It is important to break down macromolecules into smaller fragments that are of suitable size for absorption across the digestive epithelium. Large, complex molecules of proteins, polysaccharides, and lipids must be reduced to simpler particles such as simple sugar before they can be absorbed by the digestive epithelial cells. Different organs play specific roles in the digestive process. The animal diet needs carbohydrates, protein, and fat, as well as vitamins and inorganic components for nutritional balance. How each of these components is digested is discussed in the following sections

Answer:

C

Explanation:

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Answer:

i think a and c

Explanation:

Answer:

I'm pretty sure its 1080

Explanation:

force is = to mass multiplied by acceleration.

So 900 kg multiplied by 1.2m/s is = to 1080

I'm no expert so please tell me if I'm wrong so that I can improve.

Have fun buddy .

Answer:

8.49673 minutes ≈ 8.5 minutes

Explanation:

Acceleration, a is defined as the rate of change in velocity divided by the change in time to attain that velocity

\(\mathsf a = \dfrac{\Delta v}{\Delta t} \\\\\textsf {where } \mathsf {\Delta v = v-v_0} \textsf{ v being final velocity and v_0 initial velocity}\), v = final velocity and v₀ the initial velocity
and Δt is the time required to attain final velocity

Δt = number of seconds since launch = t since t₀ = 0

Therefore,
\(a = \dfrac{v-v_0}{t}\)

The space shuttle's initial velocity is 0 m/s and its final velocity must be 7800 m/s to escape earth's gravity

So v - v₀ = 7800 - 0 = 7800 m/s, t - t₀ = t = 0 = t seconds
a = 15.3 m/s²

We have the equation

a = 7800/t

a is given as 15.3 m/s² so
15.3 = 7800/t

t  = 7800/15.3 = 509.80392 seconds

To convert to minutes, divide by 60
509.80392/60 = 8.49673 minutes ≈ 8.5 minutes

A bullet is fired upward with an initial velocity of 100 m/s. What will be it’s velocity when it hit the ground?

Zero. It is sitting on the ground.   This would almost always “assume” a friction-less environment where the only force acting on the bullet is gravity.  In this case, it would be 100 m/s immediately before hitting the ground. (zero once it comes to rest)

Answer:

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The average power developed by the boy during the climb is approximately 29.4 W.

In physics, the amount of energy transferred or converted per unit time is called power.

total height = number of steps x height of each step

total height = 30 x 0.15 m = 4.5 m

Given, time = 60 s

As power = work done / time

work done = force x distance

force = mass x gravity

mass is boy's mass (40 kg) and gravity is acceleration due to gravity (9.81 m/s²).

force = 40 kg x 9.81 m/s² = 392.4 N

The distance that the boy moves is equal to the total height that he has climbed: distance = total height = 4.5 m

work done = force x distance

work done = 392.4 N x 4.5 m = 1765.8 J

power = work done / time

power = 1765.8 J / 60 s

power ≈ 29.4 W

Therefore, the average power developed by the boy during the climb is approximately 29.4 W.

As for the anomalous behavior of water, water has a higher boiling point and melting point as compared to other substances with similar molecular weight. This is due to the strong hydrogen bonding between water molecules, which requires more energy to break the bonds and change the state of water from solid to liquid to gas.

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Answer:

37.5 seconds

Explanation:

The given parameters are;

The mass of the block on the spring, m = 2.50 kg

The force with which the loaded spring launches the block, F = 450 N

The change in momentum of the block, Δp = 12.0 kg·m/s

We have;

Let the force with which the block was launched = The net force, \(F_{NET}\)

By Newton's second law of motion, we have;

F = \(F_{NET}\) = Δp × Δt

Where;

Δt = The time the block is in contact with the spring

Therefore;

\(\Delta t = \dfrac{F_{NET}}{\Delta p}\)

By plugging in the values for \(F_{NET}\) and Δp, we have;

\(\Delta t = \dfrac{450 \ N}{12.0 \ kg \cdot m/s} = 37.5 \ s\)

The time duration the block is in contact with the spring, Δt = 37.5 seconds.

Answer:

gravity

Explanation:

The force F acting on the surface is 4.57 N. The total energy stored in the system when the spring is stretched is 0.132 J. The magnitude of acceleration on the spring is 18 m/s². The speed of the block when reaches equilibrium position is 1.03 m/s.

The force acting on a stretchable material is directly proportional to the displacement of the object from the equilibrium position x.

Thus, F = k x.

Where, k is called the force constant or spring constant.

Given that, the displacement = 5.46 cm = 0.054 m

force constant = 83.8 N/m

Force = 83.8 N/m × 0.054 m = 4.57 N

The total energy stored on the system is equal to its potential energy mgh

m = 0.250 kg

Then p = 0.250 kg × 0.054 m× 9.8 m/s² = 0.132 J

Acceleration = force/ mass

= 4.57 N/0.250 = 18 m/s²

At the equilibrium position, the kinetic energy of stretching equal to the potential energy stored on it.

hence, speed v = √(2gh)

v = √2× 9.8 m/s² ×0.054m = 1.03 m/s.

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According to the given statement Mrs. Brown's electricity bill for the current month is $5000.00.

To calculate Mrs. Brown's electricity bill for the current month, we need to determine the total number of kilowatt-hours (kWh) she has consumed and apply the corresponding rates.

1. Calculate the electricity usage:

  Current meter reading - Previous meter reading
  20,300 kWh - 17,800 kWh = 2,500 kWh

2. Determine the cost for the first 2000 kWh:

  $1.00/kWh * 2000 kWh = $2000.00

3. Determine the cost for the remaining kWh:

  500 kWh * $3.50/kWh = $1750.00

4. Add the fuel adjustment charge:

  $0.50/kWh * 2500 kWh = $1250.00

5. Calculate the total bill:

  $2000.00 + $1750.00 + $1250.00 = $5000.00


To calculate the electricity bill, we first find the difference between the current and previous meter readings.

In this case, Mrs. Brown used 2,500 kWh.

For the first 2000 kWh, the cost is $1.00 per kWh, resulting in a charge of $2000.00.

For the remaining 500 kWh, the cost is $3.50 per kWh, totaling $1750.00.

Additionally, a fuel adjustment charge of $0.50 per kWh is added to the bill. This amounts to $1250.00.

Finally, we add up all the charges to get the total bill, which is $5000.00.

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Density is the mass per unit volume of any object. It is calculated by dividing the mass of an object by its volume. This is:

ρ = m/V

ρ = 4.05 g  / 12 mL

ρ = 0.3375 g/mL

OPTION A

The variation of water depth at spreading centers (ridges) controlled by isostasy  as convective cooling cools the rocks much more effectively the than heat conduction.

When heat transfer takes place between the two fluids in direct or indirect contact.

The lithosphere cools when it moves away from the ridge axis by sea floor spreading. The cooler rocks have low density, so the sea floor gets deeper as the lithosphere gets more dense.

Thus, the convective cooling cools the rocks much more effectively the than heat conduction.

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Answer: It's Friday night and Skyler has been assigned the noble task of baby-sitting Casey, his 2-year old brother. He puts a crash helmet on Casey, places him in the red wagon and takes him on a stroll through the neighborhood. As Skyler starts across the street, he exerts a 52 N forward force on the wagon. There is a 24 N resistance force and the wagon and Casey have a combined weight of 304 N. Construct a free body diagram depicting the types of forces acting upon the wagon. Then determine the net force, mass and acceleration of the wagon.

Explanation:

When Skyler exerts a force of 52 N on the wagon and there is a 24 N resistance force and the wagon and Casey have a combined weight of 304 N then Net force, mass and acceleration of the wagon will be 305.2 N, 31.02kg and 0.9 m/s² resp.

Force is responsible for the motion of an object. it produces acceleration in the body. According to newton's second law force is mass times acceleration i.e. F =ma. Its SI unit is N which is equivalent to kg.m/s². There are two types of forces, balanced force and unbalanced force. when net force acting on body is zero then it is called as balanced force and net force on the body is non zero then it is called as unbalanced force. unbalanced force are responsible for the motion of the body.

in this problem, Skyler is applying 52 N force to a wagon, there is resistance of 24N of force. Combined Wight is 304 N is directed downwards. a vector diagram is shown in the figure which gives the Net force.

the resultant force between resistance and applied force

F = 52 - 24 = 28N... means total of 28N of actual force is applied on the wagon in x direction.

There is downward force as weight, hence magnitude of net force acting on the wagon is.

F²(net) = F₁²+F₂² + F₁F₂cosθ

θ = 90, cos 90 = 0

F²(net) = F₁²+F₂²

F²(net) = 28² + 304²

F²(net)  = 93200

F (Net) = \(\sqrt{93200\\\) = 305.2 N

To get mass and acceleration,

weight W = mg

304 = m*9.8

m = 31.02 kg mass of the wagon is 31.02kg

F = ma

28 = 31.02*a

a = 0.9 m/s²

Acceleration of the wagon is 0.9 m/s². this is forward acceleration.

Hence Net force, mass and acceleration of the wagon is 305.2 N, 31.02kg and 0.9 m/s² resp.

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