An atom of an element has 8 protons and 9 neutrons in it's nucleus. What is the name of the element?

To determine the force required to keep a 10 mg water droplet moving in the circular arc created by a shaking dog's fur, we can use the centripetal force formula:

F = m * (v^2 / r)

Where F is the centripetal force, m is the mass of the droplet, v is the velocity of the fur, and r is the radius of the circular arc.

Converting the mass of the droplet to kilograms:

m = 10 mg = 10 * 10^(-6) kg

Substituting the given values:

F = (10 * 10^(-6)) * ((2.5)^2 / 0.16)

Calculating this expression gives us the centripetal force required to keep the droplet moving in the circular arc.

To find the ratio of this force to the weight of the droplet, we divide the centripetal force by the weight of the droplet. The weight of the droplet can be calculated using the formula:

Weight = mass * gravitational acceleration

Let's assume the gravitational acceleration to be approximately 9.8 m/s^2.

Weight = (10 * 10^(-6)) * 9.8

Finally, we can calculate the ratio of the centripetal force to the weight of the droplet by dividing the centripetal force by the weight.

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Answer:

MKS stands for Meter, Kilogram and second. In this system of unit mass is given in Kilogram, length in meter and time in second. ... CGS system stands for Centimeter- Gram- Second system. In CGS system, length is measured in centimeters mass is measured in grams and time is in seconds.

Answer:

Explanation: the average kinetic energy of the molecules in a pot of water when heated on a stove will go up or increase according to the kinetic theory of heat. The kinetic theory of heat correlates an increase in temperature with the increase of kinetic energy, therefore, if temperature increases, so will the kinetic energy.

Answer:

The molecules go faster.

Explanation:

The hotter the water is the moer faster the water molecules go.

According to an energy bill, a client used 1027 kilowatt hours (kwh) in July. Did the customer consume the stated 1 joules = 3600 joules?

Physically, it is colorless, odorless, and a gas at ambient temperature with a weight of 1.260 g per liter under normal circumstances. It reacts with acetone and is chemically combustible, polymerizing to make polyethylene.

The following assertion about chemical and physical changes is true: C) Physiological changes always result in the creation of new substances. In nature, there are two different types of change: chemical development and physical change. No new chemicals are created, only the physicochemical characteristics of existing substances are temporarily altered.

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Time Period of revolution of the astreoid around the sun is P = 8\(\sqrt{D^{3} }\) days.

The length of time it takes an astronomical object to complete one orbit around another object is known as the orbital period. In astronomy, it often refers to bodies like planets or asteroids revolving about the Sun, as well as moons circling other stars, exoplanets, and double stars.

In other words, the cube of the semi-major axis of any planet's orbit is equal to the square of the period of that planet's revolution around the sun. Despite the fact that all planetary orbits are elliptical, all save Pluto's are close enough to circular shapes to allow the word "radius" to be used instead of "semi-major axis." In other terms, the cube of a planet's distance from the sun (d) is equivalent to the square of a planet's period (P)

Let the distance of Earth from sun be D km

Distance of Astroid from sun is 4D km

Time taken by Astroid to orbit  sun be P days

Then,

P²= (4D)³

P = 8\(\sqrt{D^{3} }\)

Time Period of revolution  P = 8\(\sqrt{D^{3} }\)   days.

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The sickle cell allele is still common in tropical regions because it provides protection against malaria, which is prevalent in those areas.

A cell is the basic unit of life and the smallest structure that can perform all the functions necessary for life.

The sickle cell allele is still common in tropical regions because it provides protection against malaria, which is prevalent in those areas. Malaria is caused by a parasite that is transmitted by mosquitoes, and it infects and destroys red blood cells.

Individuals who carry one copy of the sickle cell allele (known as sickle cell trait) are more resistant to malaria than those who do not have the allele. This is because the sickle-shaped red blood cells that result from the sickle cell allele are less hospitable to the malaria parasite than normal red blood cells.

However, individuals who carry two copies of the sickle cell allele (known as sickle cell disease) can experience serious health complications, including pain, anemia, organ damage, and early death.

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Kepler was the first astronomer to look at the planet’s orbital paths. He discovered that these had a/an elliptical shape.

The heliocentric model is actually just a model for the solar system, not our entire universe.

20 - 5 = 15

total displacement = 15 meters

The wavelength of the light with specified separation and angle is calculated to be 578.45 nm.

The formula for light going through a double slit with separation is,

d = 2.42 × 10⁻⁵ m.

Line number m = 2

Angle θ = 2.74°

The wavelength is the separation between the peak and trough of two sound waves.

To find the wavelength, here we use the formula as,

sin θ = Line number × λ ÷ (distance)

where,

λ is wavelength

By substituting all the given values,

Sin (2.74°) = 2 × λ ÷ (2.42 × 10⁻⁵)

Rearranging the equation,

λ = [Sin (2.74°)×(2.42 × 10⁻⁵] ÷ (2)

λ = 578.45 nm.

Thus, wavelength λ of the light is calculated to be 578.45 nm.

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The polarization axes of glasses for 3-d viewing are in vertical and horizontal.

vertical and horizontal. The 3-d glasses have two lenses. Each lens is polarized in a different way. The lenses are aligned to the image on the screen and each lens allows only one image to enter the eye. This creates an illusion of depth or 3-Dimensional. The light waves that make up an image are polarized. In 3-D glasses, each lens has a different polarization. The lenses allow only the image intended for that eye to be seen. Hence, the brain can integrate the two images to form a single 3-D image.

3-D glasses create an illusion of depth by creating two different images. Each lens of the glasses is polarized in a different way, either vertically or horizontally. One of the lenses will allow the vertical polarization to be seen by one eye and the other lens will allow only horizontal polarization to be seen by the other eye. The two different images are sent to the brain, and it creates an illusion of depth. The polarization of the lenses blocks out the light from the opposite polarization. The images on the screen are transmitted through two different projectors, which are polarized at different angles. The images are projected onto the screen, and the polarization of the lenses filters the images.

3-D glasses work by polarizing the lenses in different ways to allow each eye to see a different image, which creates an illusion of depth. The polarization axes of glasses for 3-d viewing are vertical and horizontal.

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If the Earth were modelled as a spinning vertical cylinder, the temperature distribution would show a pattern of lowering temperatures from the sides (equator) to the top and bottom (poles).

If the Earth were modeled as a vertical cylinder rotating on its axis, we can expect a general distribution of heat that varies with different regions of the cylinder, including the sides, top, and bottom. Here's a description of the possible temperature distribution:

   The sides of the cylinder, representing the Earth's equatorial regions, would generally experience higher temperatures due to their proximity to the Sun. These regions would be characterized by hot or warm temperatures, as they receive more direct sunlight and experience longer durations of daylight.

   The top region of the cylinder, corresponding to the Earth's North Pole or South Pole, would experience cold temperatures. These areas receive oblique sunlight, leading to lower solar radiation and shorter daylight periods. As a result, the temperatures would generally be cold, with icy conditions prevailing.

   The bottom region of the cylinder, corresponding to the opposite pole from the top, would exhibit similar characteristics to the top region. It would also experience cold temperatures due to the oblique sunlight and shorter daylight periods.

Overall, the temperature distribution on the Earth modeled as a rotating vertical cylinder would follow a pattern of decreasing temperatures from the sides (equator) to the top and bottom (poles).

This distribution is influenced by the varying angles at which sunlight reaches different latitudes, leading to variations in solar radiation and daylight duration.

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The photon's wavelength emitted during the transition from n = 2 to n = 3 is approximately 256 nm. The photon's wavelength emitted during the transition from n = 1 to n = 3 is about 160 nm. The width of the box is approximately 0.622 nm.

The energy levels of a particle in a one-dimensional box:

Eₙ = (n² ×h²) / (8 × m × L²)

where:

Eₙ: energy level of the particle

n: quantum number of the energy level

h: Planck's constant

m: mass of the particle

L: width of the box.

Transition from n = 2 to n = 3:

Let's assume the wavelength of the photon emitted during this transition is λ.

ΔE = E₃ - E₂

ΔE = ((3² × h²) / (8 ×m × L²)) - ((2² × h²) / (8 × m × L²))

ΔE = (h² / (8× m × L²)) ×(9 - 4)

ΔE = (h²/ (8 × m × L²)) × 5

The energy difference is proportional to the frequency of the emitted photon:

ΔE = h × c / λ

where c is the speed of light.

We can equate the two expressions for ΔE:

(h² / (8 × m × L²)) × 5 = h × c / λ

λ = (8 × m × L² ×c) / (5 × h)

Plugging in the given values:

m = mass of the electron = 9.11 x 10⁻³¹ kg

L = width of the box (to be determined)

c = speed of light = 3 x 10⁸ m/s

λ = (8 ×(9.11 x 10⁻³¹ kg) × L² × (3 x 10⁸ m/s)) / (5 ×(6.626 x 10⁻³⁴ J·s))

Solving for L

L² = (5 × (6.626 x 10⁻³⁴J·s) × λ) / (8 ×(9.11 x 10⁻³¹kg) × (3 x 10⁸ m/s))

L² = 0.00047765 m²

L ≈ 0.021847 m

The wavelength of the photon is given by:

λ = (8 × (9.11 x 10⁻³¹ kg) × (0.021847 m)² × (3 x 10⁸ m/s)) / (5 × (6.626 x 10⁻³⁴J·s))

λ ≈ 256 nm

Transition from n = 1 to n = 3:

Following the same steps,

ΔE = E₃ - E₁

ΔE = ((3² × h²) / (8 ×m ×L²)) - ((1² × h²) / (8 × m × L²))

ΔE = (h² / (m × L²))

Using ΔE = h × c / λ:

(h² / (m × L²)) = h ×c / λ

Simplifying and solving for λ:

λ = (m × L² × c) / h

Plugging in the given values:

λ = ((9.11 x 10⁻³¹ kg) × (0.021847 m)² × (3 x 10⁸ m/s)) / (6.626 x 10⁻³⁴ J·s)

λ ≈ 160 nm

Width of the box (L):

From the above equations,

L² = (5 × (6.626 x 10⁻³⁴J·s) × (426 nm)) / (8 × (9.11 x 10⁻³¹ kg) × (3 x 10⁸ m/s))

L ≈ 0.000622 m or 160 nm

Therefore, the answers are 256 nm, 160 nm, and 0.622 nm respectively.

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The wavelength of the photon released during the change from n = 2 to n = 3 is roughly 256 nm. About 160 nm is the wavelength of the photon that is released when n = 1 changes to n = 3. The box has a width of about 0.622 nm.

Given values:

m = mass of the electron = 9.11 x 10⁻³¹ kg

L = width of the box (to be determined)

c = speed of light = 3 x 10⁸ m/s

The energy levels of a particle in a one-dimensional box:

Eₙ = (n² ×h²) / (8 × m × L²)

where:

Eₙ: energy level of the particle

n: quantum number of the energy level

h: Planck's constant

m: mass of the particle

L: width of the box.

Transition from n = 2 to n = 3:

The wavelength of the photon emitted during this transition is λ.

ΔE = E₃ - E₂

ΔE = ((3² × h²) / (8 ×m × L²)) - ((2² × h²) / (8 × m × L²))

ΔE = (h²/ (8 × m × L²)) × 5

The frequency of the photon that was released directly correlates with the energy difference:

ΔE = h × c / λ

,c is the speed of light.

Evaluating the two expressions for ΔE:

(h² / (8 × m × L²)) × 5 = h × c / λ

λ = (8 × m × L² ×c) / (5 × h)

λ = (8 ×(9.11 x 10⁻³¹ kg) × L² × (3 x 10⁸ m/s)) / (5 ×(6.626 x 10⁻³⁴ J·s))

Solving for L

L² = (5 × (6.626 x 10⁻³⁴J·s) × λ) / (8 ×(9.11 x 10⁻³¹kg) × (3 x 10⁸ m/s))

L ≈ 0.021847 m

The wavelength of the photon is given by:

λ = (8 × (9.11 x 10⁻³¹ kg) × (0.021847 m)² × (3 x 10⁸ m/s)) / (5 × (6.626 x 10⁻³⁴J·s))

λ ≈ 256 nm

Transition from n = 1 to n = 3:

ΔE = E₃ - E₁

ΔE = ((3² × h²) / (8 ×m ×L²)) - ((1² × h²) / (8 × m × L²))

ΔE = (h² / (m × L²))

Using ΔE = h × c / λ:

(h² / (m × L²)) = h ×c / λ

Solving for λ:

λ = (m × L² × c) / h

λ = ((9.11 x 10⁻³¹ kg) × (0.021847 m)² × (3 x 10⁸ m/s)) / (6.626 x 10⁻³⁴ J·s)

λ ≈ 160 nm

Width of the box (L):

From the above equations,

L² = (5 × (6.626 x 10⁻³⁴J·s) × (426 nm)) / (8 × (9.11 x 10⁻³¹ kg) × (3 x 10⁸ m/s))

L ≈ 0.000622 m or 160 nm

Thus, the answers are 256 nm, 160 nm, and 0.622 nm respectively.

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Answer:

F = M a        describes motion of cart

F = 10 kg * 4 m/s^2 = 40 Newtons           applied force

W = F * S = 40 N * 3 m = 120 Joules         work resulting

The electric flux through a Gaussian surface of area A enclosing an electric dipole where each charge has magnitude q  is zero.

Electric flux is the measure of the flow of an electric field through a surface. It is represented by the symbol ΦE.

1: Electric dipole and Gaussian surface
An electric dipole consists of two equal and opposite charges (magnitude q) separated by a distance d. A Gaussian surface is a closed surface that encloses these charges and is used to compute electric flux.

Step 2: Apply Gauss's Law
Gauss's Law states that the electric flux Φ through a closed Gaussian surface is equal to the total enclosed charge Q divided by the electric constant ε₀:

Φ = Q / ε₀

Step 3: Determine the enclosed charge Q
Since the electric dipole has two charges of equal magnitude but opposite signs (+q and -q), the net charge enclosed by the Gaussian surface is:

Q = (+q) + (-q) = 0

Step 4: Calculate the electric flux Φ
As Q = 0, the electric flux through the Gaussian surface is:

Φ = 0 / ε₀ = 0

In conclusion, the electric flux through a Gaussian surface of area A enclosing an electric dipole where each charge has a magnitude q is 0. This result is due to the fact that the electric dipole has equal and opposite charges, causing their electric fields to cancel each other out within the Gaussian surface.

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Answer:

You first push in then when the syringe is full push the out

Explanation:

1. in

2. out

but u should watch a You-tube video just in case

I hoped this helped!

4. B They have observed the very rapid orbits of stars close to the area.

5. A. 95%

im doing the test right now

Answer:

A

Explanation:

Answer: A

Explanation:

The power of the lens in diopters is P = 1/0.026 = 38.5 dioptres.

The power of the lens needed to magnify the reading material by a factor of 3.5x when a book is placed 9.0 cm behind a lens is 38.5 dioptres.

The focal length of the lens is given by the reciprocal of the magnification (M) multiplied by the distance of the object from the lens (d): f = 1/M x d.

In order to magnify the reading material by a factor of 3.5x when a book is placed 9.0 cm behind a lens, a diverging or converging lens is needed. The power of the lens in diopters can be calculated using the equation

P = 1/f, where P is the power in dioptres and f is the focal length in metres.

In this case, f = 1/3.5 x 0.09 = 0.026 m.

Thus, the power of the lens in diopters is P = 1/0.026 = 38.5 dioptres. Therefore, the power of the lens needed to magnify the reading material by a factor of 3.5x when a book is placed 9.0 cm behind a lens is 38.5 dioptres.

The type of image this would be is a magnified and real image. Magnified because the magnification factor is greater than one, and real image because it is formed on the same side of the lens as the object. It is also upright because the object is above the principal axis and the image below the principal axis. It is not inverted because the object and image appear the same way.  Lastly, it is not a virtual image because the image is formed by the refraction of light, not by the reflected rays.

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Few meteors make it through the thick air of this planet without disintegrating. This statement is false.

Meteors refer to heavily sized metallic objects or rock fragments that are formed as a result of a collision between asteroids.

These rock lumps revolve around the sun and are smaller in size than asteroids.

Their size ranges from grain-sized particles to about 1 meter wide objects

As they enter the atmosphere of earth they crash forming streaks of light and disintegrate into small-sized dust particles and never get through the thick air of the earth.

However, they impact the earth in several ways such as heating the earth's surface.

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Answer:

The angle is 18.3 degree.

Explanation:

A uniformly charged infinite plane, density σ = 4 x 10^-9 C/cm^2, is placed vertically in air. A small ball of mass 8 g, with charge q = 10^-8 C, hangs close to the plane, so that the string is initially parallel to the plane. Take g = 9.8m/s2. When in equilibrium, by what angle is the string hanging the ball to the plane?

surface charge density, σ = 4 x 10^-5 C/m^2

Charge, q = 10^-8 C

mass, m = 0.008 kg

Let the angle is A and the tension in the string is T.

The electric field due to a plane is

\(E =\frac{\varepsilon \sigma }{2\varepsilon o}\\\\E =\frac{4\times 10^{-5}}{2\times 8.85\times 10^{-12}}\\\\E = 2.26\times 10^6 V/m \\\)

Now equate the forces,

\(T sin A = q E.... (1)\\\\T cos A = m g ..... (2)\\\\divide (1) by (2)\\\\tan A = \frac{10^{-8}\times 2.6\times 10^6}{0.008\times 9.8}\\\\tan A = 0.33\\\\ A = 18.3 degree\)

Answer:

I don't think the information is complete

Answer:

C)  10 m/s^2 toward the center of the planet

Explanation:

g = GM/r^2

The masses of earth and this planet are the same and the radius is only diffferent by 10% so as gravitational force acceleration is 9.8m/s^2 on earth, it can be estimated to be around 10m/s^2.

Using the third law, we know acceleration is toward the larger mass from attraction, thus having it point toward the center of the planet.

Explanation:

SI system is advantageous over mks system because SI system is intended to extend by its definition and has 7 base which is more than MKS system .

Hope it is helpful to you ☺️

Answer:

Explanation:

SI system is advantageous over mks system because SI system is intended to extend by its definition and has 7 base which is more than MKS system.

The student is correct in stating that wrapping the blocks in a layer of silicone foam while they are heated will improve the accuracy of their results.

1. Insulation: The silicone foam acts as insulation around the blocks, reducing heat loss to the surroundings. This helps to minimize energy loss during the heating process and ensures that a higher percentage of the transferred energy is actually absorbed by the blocks. By reducing heat loss, the measurements obtained for the energy transferred to the blocks will be more accurate.

2. Temperature stability: The silicone foam layer helps to maintain a more stable temperature within the blocks. Without insulation, the blocks can experience temperature fluctuations due to heat loss to the environment. These temperature fluctuations can affect the accuracy of temperature measurements and introduce errors in determining the specific heat capacities.

3. Consistent heating: The silicone foam layer helps to distribute the heat more evenly across the blocks, ensuring that all parts of the blocks receive a similar amount of heat. This promotes uniform heating and reduces the likelihood of localized hotspots or uneven temperature distribution, which could affect the accuracy of the results.

Overall, by using silicone foam to wrap the blocks during heating, the student can minimize heat loss, stabilize temperature, and achieve more consistent heating. These factors contribute to improved accuracy in measuring the energy transferred and obtaining reliable results for the specific heat capacities of materials A, B, and C.

The distanve travelled is d=1200 miles

Time taken is t=420 miles.

The velocity is

The velocity is 2.85 miles/min

Answer:

1/4

Explanation:

(2,3)=(x1, y1)

(6,4)=(x2,y2)

Then,

Slope=(y2-y1)/(x2-x1)

=1/4

Answer:

\(T_{m }\) = 4.86 s

\(T_{e}\) = 1.98 s

Explanation:

Given:

Length = l = 1 m

Acceleration due to gravity of moon = \(g_{m}\) = 1.67 m/s²

Acceleration due to gravity of Earth = \(g_{e}\) = 10 m/s²

Required:

Time period = T = ?

Formula:

T = 2π \(\sqrt{\frac{l}{g} }\)

Solution:

For moon

Putting the givens,

T = 2(3.14) \(\sqrt{\frac{1}{1.67} }\)

T = 6.3 \(\sqrt{0.6}\)

T = 6.3 × 0.77

T = 4.86 sec

For Earth,

Putting the givens

T = 2π \(\sqrt{\frac{1}{10} }\)

T = 2(3.14) \(\sqrt{0.1}\)

T = 6.3 × 0.32

T = 1.98 sec

Answer:

The resistance of a thin wire is greater than the resistance of a thick wire because a thin wire has fewer electrons to carry the current. The relationship between resistance and the area of the cross section of a wire is inversely proportional .

The best way to think about this is:

A thick/wide road, with many lanes, can carry more cars than a thin/narrow road, with only one or two lanes.