A 25-cm-long icicle hangs from the eave of a house on a day when the temperature is -2.0∘C.
By how many millimeters does the icicle shrink if a bitterly cold wind drops the temperature to -28∘C?

Answer:

Oxygen is abiotic

Explanation:

The velocity and thermal boundary layer thicknesses at a distance of 40 mm from the leading edge for each fluid are as follows: atmospheric air (velocity: 1 m/s, thermal boundary layer thickness: X mm), water (velocity: 1 m/s, thermal boundary layer thickness: Y mm), engine oil (velocity: 1 m/s, thermal boundary layer thickness: Z mm), and mercury (velocity: 1 m/s, thermal boundary layer thickness: W mm).

At a film temperature of 300 K, the velocity and thermal boundary layer thicknesses for each fluid at a distance of 40 mm from the leading edge can be determined.

For atmospheric air, the velocity is 1 m/s, and the thermal boundary layer thickness is represented as X mm. Similarly, for water, engine oil, and mercury, the velocity remains at 1 m/s, with thermal boundary layer thicknesses of Y mm, Z mm, and W mm, respectively.

The velocity and thermal boundary layer thickness are significant parameters in the study of fluid dynamics and heat transfer over a flat plate. The velocity represents the speed of the fluid flow, while the thermal boundary layer thickness indicates the distance from the surface where heat transfer occurs predominantly due to conduction.

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Answer:

I think when the balloon is heated up the gas will expand making the balloon bigger. When things are heated up the molecules will get excited and expand. When they balloon is cooled then the it will retract.

Hope this helps! :)

Given:

The charge is q1 = 9.4 nC

The charge q2 = -2.31 nC

The distance between them is r = 4.94 cm

To find the electric field strength at the midpoint between two charges.

Explanation:

The electric field strength at the midpoint will be the sum of electric field strength due to q1 and q2.

The electric field strength can be calculated by the formula

Here, k is the electrostatic constant whose value is

The electric field strength due to the charge q1 is

The electric field strength due to the charge q2 is

The electric field strength at the midpoint will be

Thus, the electric field strength at the midpoint between the two charges is 173000 V/m

There are certainly times when someone's actions can cause others to dislike them. For example, if someone consistently behaves rudely or disrespectfully towards others, this can quickly turn people off.  we can build positive physical relationships and avoid causing unnecessary conflicts or hurt feelings.

The Similarly, if someone is frequently dishonest or unreliable, this can also cause others to lose trust and respect for them. It's also worth noting that some actions may be more egregious than others and may cause stronger negative reactions. For example, if someone engages in bullying behavior or is openly discriminatory towards certain groups, this is likely to be viewed very negatively by most people. Ultimately, the key to avoiding negative reactions from others is to be mindful of how our actions impact those around us, and to strive to treat others with kindness, respect, and honesty. By doing so, we can build positive physical relationships and avoid causing unnecessary conflicts or hurt feelings.

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Answer:

acceleration = 0.013 m/s²

Explanation:

formula for acceleration is

a = (v-u) / t

a= (0.7-0.3) / 30

= 0.013

The acceleration of a turtle going from 0.3 m/s to 0.7 m/s in 30 seconds is 0.0133m/s²

Acceleration is defined as the change in velocity of a body with respect to time. Mathematically:

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

v is the final speed = 0.7m/s

u is the initial speed = 0.3m/s

t is the time taken = 30seconds

Substitute the given values into the formula:

\(a=\frac{0.7-0.3}{30}\\a=\frac{0.4}{30}\\a = 0.0133m/s^2\)

Hence the acceleration of a turtle going from 0.3 m/s to 0.7 m/s in 30 seconds is 0.0133m/s²

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Answer:

It is found that W1 - W2 loss in weight of solid when immersed in water is equal to the weight of the water displaced by the body. This verifies Archimedes' principle.

Answer:10

Explanation:acellus

Answer:

technology will take over

Explanation:

technology was have a huge impact on our world , we will be active and we would have new technology that will help and will become a help in everyday lifestyle

In Translational motion, the body moves in a straight line whereas in Rotational motion, the body moves in a circular path.

In Translational motion, the body moves in a straight line and the body same displacement in equal interval of time while on the other hand, in Rotational motion, the body moves in a circular path and the body travels same angular displacement in equal interval of time..

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Cells represents the building blocks for all living things.

Cells are called "the building blocks of life" because they are the basic structural and functional elements of human life. Cells are the basic units of all stages of biological organization. This suggests that cells of different species create tissues, organs, and organ systems.

The cornerstone of all living beings is the cell. There are billions of cells in the human body, each serving a specific purpose.

Your DNA contains information that tells our cells how to make proteins. Vital bodily processes including digestion, cell growth and muscle movement are fueled by protein.

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if a charged object touches a neutral object it will be a short circuit.

Answer:

will force atom(electrons) within the escort (conductor) to go (move).

Explanation:

The most common way to make a roller coaster go both forward and backward along the same track is to use permanent magnets mounted on both the car and the track.

The magnets are arranged so that the opposite poles of the magnets on the car and the track are facing each other, creating a repulsive force that keeps the car suspended in the air. The car can then be propelled in either direction by changing the polarity of the electromagnets, causing the car to move in the opposite direction. The car also has fins on both sides which help to keep it stable and on the track. Finally, the track can be heated in order to reduce friction and make it easier for the car to move in either direction.

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complete question: To make a roller coaster go both forward and backward along the same track,–

A. permanent magnets are mounted on both the car and the track.

B. the polarity of an electromagnet is reversed.

C. the car has fins on both sides.

D. the track is heated.

When a vehicle is approaching you, it is important to dim your high-beam headlights to low beams within a distance of approximately 500 feet.

This distance provides enough time for the oncoming driver to adjust their vision and safely navigate the road. By dimming your high beams, you reduce the risk of blinding the other driver and causing potential accidents or discomfort. Maintaining proper headlight etiquette promotes safety and ensures a clear line of sight for all drivers on the road, allowing for a smoother and more secure driving experience during nighttime or low visibility conditions.

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a.) To find the energy of this system, we need to calculate the potential energy of the two cubes due to their charges. The potential energy of a charged object is given by the formula:

U = (1/2)QV

Where:

U = potential energy

Q = charge of the object (in Coulombs)

V = voltage (in Volts)

The masses of the cubes are given in grams, so we need to convert them to Coulombs:

2.0 g = 2.0 x 10^-3 kg x (1 Coulomb/1.6 x 10^-19 Coulombs) = 1.25 x 10^-16 Coulombs

4.0 g = 4.0 x 10^-3 kg x (1 Coulomb/1.6 x 10^-19 Coulombs) = 2.5 x 10^-16 Coulombs

The cubes are charged to 2.0 mc, which is equal to 2.0 x 10^-6 Coulombs.

Now we can use the formula above to find the potential energy of each cube:

U1 = (1/2)QV = (1/2)(1.25 x 10^-16 Coulombs)(2.0 x 10^-6 Coulombs) = 0.000015625 J

U2 = (1/2)QV = (1/2)(2.5 x 10^-16 Coulombs)(2.0 x 10^-6 Coulombs) = 0.00003125 J

The total energy of the system is the sum of the potential energies of the two cubes:

E = U1 + U2 = 0.000015625 J + 0.00003125 J = 0.000046875 J

b.) To find the tension in the string, we need to consider the forces acting on the two cubes. The cubes are at rest, so the net force on each cube must be zero. Therefore, the tension in the string must be equal to the weight of the two cubes. The weight of an object is given by the formula:

F = m*g

Where:

F = force (weight)

m = mass of the object

g = acceleration due to gravity (9.8 m/s^2)

The mass of the two cubes is 2.0 g + 4.0 g = 6.0 g. So the weight of the two cubes is:

F = m*g = (6.0 x 10^-3 kg)(9.8 m/s^2) = 0.0588 N

The tension in the string is the same as the weight of the two cubes, which is 0.0588 N.

c.) When the string is cut, the two cubes will move apart due to the repulsion of their charges. The speed of each cube can be found using the conservation of energy principle. The initial energy of the system is the potential energy of the two cubes:

Ei = U = 0.000046875 J

The final energy of the system is the kinetic energy of the two cubes:

Ef = (1/2)mv^2

Where:

m = mass of the cube

v = velocity of the cube

The total final energy of the system is the sum of the kinetic energies of the two cubes:

Ef = (1/2)m1v1^2 + (1/2)m2v2^2

Since the total energy of the system is conserved, we can say:

Ei = Ef

0.000046875 J = (1/2)(2.0 x 10^-3 kg)v1^2 + (1/2)(4.0 x 10^-3 kg)v2^2

To find the speed of each cube, we can solve for v1 and v2 individually by isolating them on one side of the equation:

v1 = ((2*(0.000046875 J)) / (2.0 x 10^-3 kg))^0.5

v2 = ((2*(0.000046875 J)) / (4.0 x 10^-3 kg))^0.5

v1 = 0.019 m/s

v2 = 0.013 m/s

So the speed of the first cube is 0.019 m/s and the speed of the second cube is 0.013 m/s (rounded to the nearest whole number).

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In a planetary nebula, the shell of expelled material is glowing intensely due to the UV radiations being emitted from the center of the dying star.

What is a planetary nebula?

Rarefied gas with a density of typically makes up a typical planetary nebula. The highest densities, up to 106 particles per cm3, can be found in young planetary nebulae. The density of nebulae decreases with aging due to their expansion. From 0.1 to 1 solar masses is the mass range of planetary nebulae.

Gases are heated to temperatures of about 10,000 K by radiation from the central star. The temperature of the gas is typically 16,000–25,000 K higher in the central regions than it is in the outermost regions. The area around the central star is frequently filled with a very hot (coronal) gas with a temperature of about 1,000,000 K. Fast stellar wind, a gaseous component, is produced at the central star's surface.

Nebulae can be classified as radiation-bounded or matter-bounded. The visible nebula is fully ionized in the first scenario because there is not enough stuff in the nebula to absorb all of the UV rays released by the star. The latter occurs when the core star's UV photon output is insufficient to completely ionize the surrounding plasma, and an ionization front moves outward into the circumstellar envelope of neutral atoms.

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Answer:

\(28\; {\rm kg \cdot m\cdot s^{-1}}\).

Explanation:

The impulse on an object is equal to the change in momentum.

By the conservation of momentum, the total momentum of this system will stay unchanged. In other words, the sum of the change in the momentum of the wall and the projectile will be \(0\):

\(\Delta p(\text{projectile}) + \Delta p(\text{wall}) = 0\).

Rearrange to obtain:

\(\Delta p(\text{wall}) = -\Delta p(\text{projectile})\).

The change in the momentum of the projectile is:

\(\begin{aligned} & \Delta p(\text{projectile}) \\ &= m(\text{projectile}) \, \Delta v(\text{projectile}) \\ &= (2.0\; {\rm kg})\, ((8.0 - (-6.0))\; {\rm m\cdot s^{-1}}) \\ &= 28\; {\rm kg\cdot m\cdot s^{-1}} \end{aligned}\).

The change in the momentum of the wall would then be:

\(\Delta p(\text{wall}) = -\Delta p(\text{projectile}) = -28\; {\rm kg\cdot m\cdot s^{-1}}\).

Thus, the magnitude of the impulse on the wall would be \(28\; {\rm kg\cdot m\cdot s^{-1}}\).

The energy of the photon of blue light is  4.55 × 10^-19 J. Blue light is in the visible spectrum.

Using the formula;

E = hc/λ

E = energy of the photon = ?

h = Plank's constant = 6.6 × 10^-34 Js

c = Speed of light = 3 × 10^8 m/s

λ = wavelength of light = 435nm or 435  × 10^-9 m

Substituting values;

E =  6.6 × 10^-34 Js ×  3 × 10^8 m/s/435  × 10^-9 m

E = 4.55 × 10^-19 J

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The velocity of the wave covering 6 meters in 1 second is 6 m/s.

The velocity of any object is given by it's displacement or distance divided by the total time it takes to cover that distance.

So, here in this case travelling a distance of 6 m in 1 second show the velocity V of the wave is given by,

V = distance/time

Hear the average distance covered by the wave is 6 m at the time is 1 second so the velocity V is,

V = 6/1

V = 6m/s.

Hence the velocity of this wave is 6 m/s.

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Answer:

0.12 kW

Explanation:

Given that

The flow rate of air (V)=0.3 ft³/s

V=0.008 m³/s

Pressure, P=14.7 psia

P=1.013529 atm=101.325  kPa

Inlet temperature = 70° F=294.261 K

Exit temperature = 83° F=301.483 K

We know that , specific heat capacity of the air

Cp=1.005 kJ/kg.K

The mass flow rate of air is given as

\(\dot{m}=\dfrac{P\times V}{R\times T}\\\dot{m}=\dfrac{101.325\times 0.008}{0.287\times 294.261}\\\dot{m}= 0.0095\ kg/s\)

By using energy conservation

\(Electric\ power =\dot{m}\times C_p\times (T_2-T_1)\\Electric\ power =0.0095\times 1.005\times (83-70)=0.12\ kW\)

Therefore electric power dissipate by components will be 0.12 kW.

Solution :

The direction of current is into the page.

The magnetic field \($B_1$\) due to the wire is perpendicular to AP and the magnetic field \($B_2$\) due to the wire is perpendicular to BP. Thus, the net magnetic field at point P is towards the right.

The net magnetic field at point P is

\($B_{net} = B_1 \cos \theta + B_2 \cos \theta$\)

The magnetic field is

\($B_1=B_2=\frac{\mu_0I}{2 \pi L}$\)

The angle θ is

\($\theta = \cos^{-1}\frac{h}{L}$\)

The net magnetic field at point P is

\($B_{net}=\left(\frac{\mu_0I}{2 \pi L}\right)\left(\frac{h}{L}\right)+\left(\frac{\mu_0I}{2 \pi L}\right)\left(\frac{h}{L}\right)$\)

       \($=\frac{\mu_0 Ih}{\pi L^2}$\)

a). The direction of the current for both the wires is from north to south. The net magnetic field is towards the right when we are facing south.

\($B_{net}=\frac{\mu_0 Ih}{\pi L^2}$\)

       \($=\frac{\mu_0I L}{\pi \left(\sqrt{h^2+(d/2)^2\right)^2}}$\)

       \($=\frac{4 \pi \times 10^{-7} \times 100 \times 15}{\pi \left(\sqrt{15^2+(3/2)^2\right)^2}}$\)

       \($=2.64 \times 10^{-6} \ T$\)

The direction is towards the west.

b). Since, both the magnetic field are equal and opposite, so no magnetic field is produced.

Answer:

I believe the answer is trench.

Explanation:

Hope this helps! <3

Answer:

B. Fault

Explanation:

Please correct me if I’m wrong

(it’s either b or c)

Answer:

iron,Cobalt and nickel

The efficiency of the Carnot engine is calculated by the formula efficiency, η = 1 - (T₂ / T₁). The efficiency of the Carnot engine η = 30% with low-temperature T₁= 320 k and high-temperature T₂ = 457K.

The Carnot engine is a theoretical model of the thermodynamic cycle proposed by Leonard Carnot. Carnot's theorem states that an engine works between a hot and cold reservoir can have more efficiency than an engine that works between the same reservoirs. The efficiency of Carnot's engine is, η = 1 ₋ (T₂ /T₁ ), T₂ represents high temperature and T₁ represents low temperature. η represents efficiency.

From the given,

η = 1 ₋ (T₂ /T₁ )

T₁ = T₂ / (1 ₋η) = 320 / (1₋0.30)

T₁ = 427 K.

Thus, T₁ is 427K and T₂ is 320 K giving an efficiency of 30%.

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A simple way to measure your fluid balance is to look at the color of your urine. If your urine is dark and has a strong odor, you are definitely dehydrated and need to increase your water intake. If your urine is completely clear, you probably drank too much.

It usually takes about two hours for the body to fully rehydrate after drinking a significant amount of water. Water is best because you need to stay hydrated. Sports drinks like Gatorade can help athletes who need to replenish their electrolytes.

Research shows that milk is one of the best drinks for hydration better than water and sports drinks. Researchers attribute its effectiveness to milk's natural electrolytes carbohydrates and proteins. can take as little as 5-15 minutes. However, if you are dehydrated with an empty bladder it can take up to 8-9 hours before you need to urinate.

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An atom with great electronegativity is able to attract electrons towards itself in a chemical bond. This means that it is able to form strong covalent bonds with other atoms, and can also participate in ionic bonding by attracting electrons away from other atoms.

Additionally, an atom with high electronegativity is able to exert a greater degree of control over the distribution of charge within a molecule, making it an important factor in determining the overall reactivity and behavior of the molecule.

Electronegativity is a measure of an atom's ability to attract electrons towards itself when it is part of a chemical bond. In other words, it is a measure of an atom's ability to pull electrons away from other atoms in a molecule. Electronegativity is an important concept in chemistry, as it helps predict how atoms will behave in chemical reactions.

Electronegativity is typically measured on a scale called the Pauling scale, named after the American chemist Linus Pauling. The scale ranges from 0.7 (for the least electronegative element, francium) to 4.0 (for the most electronegative element, fluorine). Elements towards the right side of the periodic table, such as the halogens and oxygen, are generally more electronegative than elements towards the left side, such as the alkali metals.

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Answer:

The answer is B.

Explanation:

The formula of power is :

\(power = \frac{work \: done}{time} \)

* Work done can be "Energy"

Remember, there's 2 types of accelaration formula.

1st formula :

a = ( final speed - initial speed ) ÷ time

2nd formula :

resultant force (f) = mass × a

or

a = resultant force (f) ÷ mass

So the ans shld be,

a = 50 x 150

= 7500 m/s²

The acceleration of the body is 0.33 m/s².

Acceleration of an object having mass is defined as the net force acting on the object per unit mass.

Here,

Mass of the body, m = 150 kg

Force acting on the body, F = 50 N

The net force acting on an object is defined as the product of mass and acceleration of the object.

The expression for the net force acting on the body is given by,

F = ma

Therefore, the acceleration of the body,

a = F/m

Applying the values of F and m,

a = 50/150

a = 0.33 m/s²

Hence,

The acceleration of the body is 0.33 m/s².

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