The silica cylinder of a radiant wall heater is 0.6 m long
and has a radius 6 mm. If it is rated at 1.5 kw estimate
its temperature when operating. [The Stefan constant,
6=6 x 10-8 wm-2-4)

The groups aren't well formatted ;

The groups are ;

(-3, -1, 0, 2, 7) ; (9, 7, 6, -5, -4) ; (8, -6, 5, -4, 1) ; (-3, -4, -7, -8, -9)

Answer:

(-3, -4, -7, -8, -9)

Explanation:

Given the following group of numbers :

Evaluating each group of values for which is correctly arranged from greatest to least.

(-3, -1, 0, 2, 7) : - 1 is greater than - 3 (the group isn't arranged from greatest to least)

(9, 7, 6, -5, -4) : - 4 is greater than - 5 ; hence, the group isn't arranged from greatest to least

(8, -6, 5, -4, 1) : 5 is greater than - 6 ; hence, the group isn't arranged from greatest to least

(-3, -4, -7, -8, -9) ; the group of numbers here is arranged from greatest to least ;

(-3 > -4 > -7 > -8 > -9) ; hence, the correct group

Answer:  TRUE /   IT IS TRUE

Explanation:

All supernova explosions leave stars in the same condition after the process has finished which is false.

Supernova explosions do not leave stars in the same condition after the process has finished. Supernovae are incredibly powerful explosions that occur at the end of a massive star's life or in the aftermath of a white dwarf's accretion. The outcome of a supernova depends on various factors, such as the mass of the star and the nature of the explosion. There are two main types of supernovae: Type I and Type II.

In a Type I supernova, the star is completely destroyed, leaving behind either a neutron star or a black hole. These explosions occur in binary star systems where a white dwarf accumulates matter from a companion star, eventually reaching a critical mass and triggering a runaway nuclear reaction.

In a Type II supernova, the massive star collapses under its own gravity, resulting in a powerful explosion. After the explosion, what remains can vary. It could leave behind a neutron star or even a black hole. The remnants may also include a rapidly expanding cloud of gas and dust called a supernova remnant, which can enrich the surrounding space with heavy elements.

Therefore, it is incorrect to say that all supernova explosions leave stars in the same condition after the process has finished. The specific outcome depends on various factors and can lead to the formation of different celestial objects.

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Answer:

When the angle between two vectors A and B is 0 degrees, they are parallel to each other and pointing in the same direction. In this case, the resultant of the two vectors will be the sum of the magnitudes of A and B, and it will also be parallel to both A and B.

When the angle between two vectors A and B is 90 degrees, they are perpendicular to each other. In this case, the resultant of the two vectors will be the vector that connects the initial point of A to the terminal point of B (or vice versa). The magnitude of the resultant vector can be found using the Pythagorean theorem: |R| = sqrt(|A|^2 + |B|^2), where |A| and |B| represent the magnitudes of vectors A and B, respectively.

When the angle between two vectors A and B is 180 degrees, they are pointing in opposite directions. In this case, the resultant of the two vectors will be the difference between the magnitudes of A and B, and it will be in the direction of the larger vector. The magnitude of the resultant vector can be found by subtracting the magnitude of the smaller vector from the magnitude of the larger vector: |R| = |A| - |B| if |A| > |B| or |R| = |B| - |A| if |B| > |A|.

To determine the resultant of two vectors A and B, it is necessary to know the magnitudes of the vectors and the angle between them. In your question, you provided the angles between A and B (0 degrees, 90 degrees, and 180 degrees), but you did not specify the magnitudes of the vectors.

Without the magnitudes of vectors A and B, it is not possible to calculate the exact resultant. The resultant vector depends on both magnitude and direction, and without knowing the magnitudes, it is not possible to determine the resultant accurately.

If you provide the magnitudes of vectors A and B, I can help you calculate the resultant for each angle.

Answer:

32

Explanation:

Answer:

32

Explanation:

Sulfur has 16 protons and 16 neutrons. The atomic number is roughly 32. Therefore, 16 + 16 = 32 nucleons.  

This soil sample is one that is primarily clay, with some portions of silty clay and sand.

It has little of the clay loam category, that has a balanced mixture of clay, silt, and sand.

The soil triangle shows soil texture using sand, silt, and clay. Based on given percentages, soil sample has 40% silt, 40% sand, and 20% clay. It's silty sand or sandy loam soil.

Clay loam soil has a balanced blend of clay, silt, and sand. Moderate water-holding, good drainage, favorable nutrient retention. Sandy clay is a mixture of sand and clay. Retains sandy soil traits with better water hold from clay.

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Answer:

0.0217 m

Explanation:

Ftom the question,

Applying Coulomb's law

F = kqq'/r²............... Equation 1

Where F = Electric Force, q and q' = First and second charge respectively, r = distance between the charges, k = coulomb's constant.

make r the subeject of the equation

r = √[(kqq')/F]............. Equation 2

Given: q = +3.6×10⁻⁸ C, q' = -3.2×10⁻⁸ C, F = -2.2×10⁻² N

Constant: k = 8.98×10⁹ Nm²/C²

Substitute these values into equation

r = √(+3.6×10⁻⁸×-3.2×10⁻⁸×8.98×10⁹/-2.2×10⁻²)

r = √(-103.4489×10⁻⁷/-2.2×10⁻²)

r = √(47.02×10⁻⁵)

r = 21.68×10⁻³

r ≈ 21.7×10⁻³ m.

r ≈ 0.0217 m

Hence the seperation between the two balloons is 0.0217 m

The line, 100 mm in length, is parallel to and 40 mm above the h.p. Its ends, positioned 25 mm and 50 mm in front of the v.p., are connected to form projections. The inclination with the v.p. is 48.59°.

To draw the projections of the line, we start by drawing the plan view (H₁) and the front view (V₁).

In the plan view (H₁), we draw a horizontal line of 100 mm length. The line is parallel to the horizontal plane (h.p.), so it remains at the same height as the h.p.

In the front view (V₁), we draw a vertical line to represent the height above the h.p. Since the line is 40 mm above the h.p., we draw a line 40 mm long above the ground line. Then, we draw the line segments representing the ends of the line.

The first end is 25 mm in front of the vertical plane (v.p.), and the second end is 50 mm in front of the v.p. We connect these ends to the top of the vertical line to complete the front view.

To find the inclination of the line with the v.p., we use the right triangle formed by the height of the line (40 mm) and the distance from the v.p. to the second end of the line (50 mm). We can calculate the inclination angle using the tangent function:

tan(θ) = opposite/adjacent = 40/50

Solving for θ, we find:

θ = tan^(-1)(40/50) = 48.59°

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The complete reaction of 1.21 mol of carbon (C) produces 2.42 mol of hydrogen gas (H2), which is equivalent to approximately 54.5 liters.

The balanced chemical equation for the reaction between carbon and hydrogen gas is:

[tex]C + 2H_2 -- > CH_4[/tex]

From the balanced equation, we can see that for every 1 mole of carbon (C), 2 moles of hydrogen gas (H2) are required to form 1 mole of methane (CH4). Since the reaction is complete, all the carbon will be consumed, and therefore the moles of hydrogen gas produced will be twice the moles of carbon.

Given that we have 1.21 mol of carbon, we can calculate the moles of hydrogen gas produced by multiplying the moles of carbon by 2:

2.42 mol H2 = 1.21 mol C × 2 mol H2 / 1 mol C

To convert the moles of hydrogen gas to liters, we can use the ideal gas law, which states that PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature. Rearranging the equation to solve for V, we have:

V = (nRT) / P

Substituting the given values into the equation and solving for V, we get:

V = (2.42 mol H2 × 0.0821 L·atm/mol·K × 319 K) / 1.0 atm

V ≈ 54.5 liters

Therefore, approximately 54.5 liters of hydrogen gas are formed from the complete reaction of 1.21 mol of carbon.

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Answer:

11 cm and concave

Explanation:

edge 2021

Answer:

it is -21, The top part is correct it is only the second part this is the first part.

Explanation:

-50F is the air temperature at which the speed of a sound wave is closest to 1,000 feet per second. It is option D.

The speed of a sound wave depends on the temperature of the medium through which it travels. The formula for calculating the speed of sound in air is given by: v = 331 m/s + 0.6 m/s °C × t

t = temperature in degrees Celsius  

v = velocity of the sound wave in meters per second.

Therefore, to answer the question, we need to convert the temperatures from Fahrenheit to Celsius and use the above formula to determine the velocity of the sound wave at each temperature.

A. -46F = -43.33°C

Speed of sound = 331 + 0.6 x (-43.33)≈ 304.4 m/s

B. -48F = -44.44°C

Speed of sound = 331 + 0.6 x (-44.44)≈ 303.6 m/s

C. -49F = -45°C

Speed of sound = 331 + 0.6 x (-45)≈ 303 m/s

D. -50F = -45.56°C

Speed of sound = 331 + 0.6 x (-45.56)≈ 302.5 m/s

Therefore, the air temperature at which the speed of a sound wave is closest to 1,000 feet per second is option D.-50F.

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The height of the cannon where the objects are launched from is 18 feet.

The canons of page construction are historical reconstructions, based on careful measurement of extant books and what is known of the mathematics and engineering methods of the time, of manuscript-framework methods that may have been used in Medieval- or Renaissance-era book design to divide a page into pleasing proportions. Since their popularization in the 20th century, these canons have influenced modern-day book design in the ways that page proportions, margins and type areas (print spaces) of books are constructed.

To determine the height of the cannon where the objects are launched from, we need to find the value of "h" when "t" is equal to zero.

Given the equation: h = (-1/5)×t^2 + 5×(t) + 18

Substituting t = 0 into the equation, we have:

h = (-1/5)×(0)^2 + 5(0) + 18

= 0 + 0 + 18

= 18

Therefore, the height of the cannon where the objects are launched from is 18 feet.

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Answer:

[tex]\frac{60kgm}{s}[/tex]

Explanation:

momentum = mass * velocity

= 20kg * 3m/s

= 60kgm/s

a. The potential at 5.50 cm from the center of the sphere is 9.00 x [tex]10^7[/tex] V.

b. The potential at 30.0 cm from the center of the sphere is 1.65 x [tex]10^8[/tex] V.

c. The potential at 16.0 cm from the center of the sphere is 2.47 x [tex]10^8[/tex] V.

To find the value of the potential at different distances from the center of the sphere, we can use the equation for the electric potential of a uniformly charged sphere.

Given:

Total electric charge (Q) = 5.50 nC

Radius of the sphere (R) = 30.0 cm = 0.30 m

a) To find the potential at 5.50 cm from the center of the sphere:

Distance from the center of the sphere (r) = 5.50 cm = 0.055 m

The equation for the electric potential of a uniformly charged sphere is:

V = k × Q / r

where V is the potential, k is the Coulomb's constant (8.99 x [tex]10^9[/tex] N m²/C²), Q is the total charge, and r is the distance from the center of the sphere.

Substituting the given values into the equation:

V = (8.99 x [tex]10^9[/tex] N m²/C²) × (5.50 x [tex]10^{-9[/tex] C) / 0.055 m

Calculating the value:

V = 9.00 x [tex]10^7[/tex] V

Therefore, the potential at 5.50 cm from the center of the sphere is 9.00 x [tex]10^7[/tex] V.

b) To find the potential at 30.0 cm from the center of the sphere:

Distance from the center of the sphere (r) = 30.0 cm = 0.30 m

Using the same equation as above:

V = (8.99 x [tex]10^9[/tex] N m²/C²) × (5.50 x [tex]10^{-9[/tex] C) / 0.30 m

Calculating the value:

V = 1.65 x [tex]10^8[/tex] V

Therefore, the potential at 30.0 cm from the center of the sphere is 1.65 x [tex]10^8[/tex] V.

c) To find the potential at 16.0 cm from the center of the sphere:

Distance from the center of the sphere (r) = 16.0 cm = 0.16 m

Using the same equation as above:

V = (8.99 x [tex]10^9[/tex] N m²/C²) × (5.50 x [tex]10^{-9[/tex] C) / 0.16 m

Calculating the value:

V = 2.47 x [tex]10^8[/tex] V

Therefore, the potential at 16.0 cm from the center of the sphere is 2.47 x [tex]10^8[/tex] V.

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The power series representation for the function f(x) = ln(7 - x) is f(x) = ln(7) - ∑(n=0 to ∞) [(x - 7)^n / (n+1)].

To find the power series representation, we can use the Taylor series expansion of the natural logarithm function ln(1 + x):

ln(1 + x) = x - (x^2 / 2) + (x^3 / 3) - (x^4 / 4) + ...

In this case, we have the function f(x) = ln(7 - x), which can be rewritten as f(x) = ln(1 + (x - 7)).

Using the Taylor series expansion, we substitute (x - 7) in place of x:

f(x) = (x - 7) - [(x - 7)^2 / 2] + [(x - 7)^3 / 3] - [(x - 7)^4 / 4] + ...

Simplifying, we can write this as:

f(x) = -∑(n=0 to ∞) [(x - 7)^n / (n+1)]

Next, we add ln(7) to the series to account for the constant term:

f(x) = ln(7) - ∑(n=0 to ∞) [(x - 7)^n / (n+1)]

The radius of convergence, R, can be determined by using the ratio test. The ratio test states that if the limit of the absolute value of the ratio of consecutive terms in the series is L, then the series converges absolutely when L < 1 and diverges when L > 1.

In this case, we take the absolute value of the terms in the series and calculate the limit:

lim(n→∞) |(x - 7)^(n+1) / [(n+2)(x - 7)^n]|

Simplifying and taking the limit, we find:

lim(n→∞) |x - 7| / (n + 2)

Since this limit approaches zero for any value of x, the series converges for all values of x. Therefore, the radius of convergence, R, is infinity.

The power series representation for the function f(x) = ln(7 - x) is f(x) = ln(7) - ∑(n=0 to ∞) [(x - 7)^n / (n+1)]. The series converges for all values of x, indicating that the radius of convergence, R, is infinity.

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Answer:

3 m/s²

Explanation:

Initial Velocity, u = 18

Final velocity, v = 36

Time, t = 6 seconds

Acceleration is the change in velocity of a body with time. It obtained using the relation :

Acceleration = (v - u) / t

Acceleration = (36 - 18) / 6

Acceleration = 18 / 6

Acceleration = 3m/s²

Hence, acceleration of the skier is 3m/s²

Therefore, the focal length of the converging lens is approximately 9.33 cm or 21 cm (rounded to the nearest whole number).

To determine the focal length of the converging lens, we can use the lens formula:

1/f = 1/v - 1/u

where f is the focal length, v is the image distance from the lens, and u is the object distance from the lens.

Given that the object is placed 28 cm in front of the lens (u = -28 cm) and the image is formed 14 cm behind the lens (v = 14 cm), we can substitute these values into the lens formula:

1/f = 1/14 - 1/(-28)

Simplifying the equation:

1/f = 1/14 + 1/28

Finding a common denominator:

1/f = 2/28 + 1/28

Combining the fractions:

1/f = 3/28

Inverting both sides of the equation:

f = 28/3

Converting the fraction to decimal form:

f ≈ 9.33 cm

Therefore, the focal length of the converging lens is approximately 9.33 cm or 21 cm (rounded to the nearest whole number).

The focal length of the converging lens is approximately 21 cm.

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Answer:

Efficiency of the inclined plane is 56%

Explanation:

efficiency = (work output / work input) x 100%

efficiency = ([load force x load distance] x [effort force x effort distance]) x 100%

efficiency = (250 kg x 10 m) / (180 kg x 25 m) x 100%

efficiency = (2500kg/m) / (4500kg/m) x 100%

efficiency = 0.555 = 0.56 x 100%

efficiency = 56%

Answer:

Y = 4.775 x 10⁹ Pa = 4.775 GPa

Explanation:

First, we calculate the stress on the rod:

[tex]stress = \frac{Force}{Area} = \frac{3000\ N}{\pi r^2} \\\\stress = \frac{3000\ N}{\pi (0.01\ m)^2}\\\\stress = 9.55\ x\ 10^6\ Pa = 9.55 MPa\\[/tex]

Now, we calculate the strain:

[tex]strain = \frac{Change\ in Length}{Original\ Length}\\\\strain = \frac{0.501\ m - 0.5\ m}{0.5\ m}\\\\strain = 0.002\\[/tex]

Now, we will calculate the Young's Modulus (Y):

[tex]Y = \frac{stress}{strain}\\\\Y = \frac{9.55\ x\ 10^6\ Pa}{0.002} \\[/tex]

Y = 4.775 x 10⁹ Pa = 4.775 GPa

To find the electric potential at the center of one of the rings, we can use the formula for the electric potential due to a charged ring: V = k * Q / r

where V is the electric potential, k is the Coulomb's constant (8.99 × 10^9 N m²/C²), Q is the charge of the ring, and r is the distance from the center of the ring. In this case, the charge of each ring is +3.0 nC (nanocoulombs) = 3.0 × 10^-9 C, and the distance from the center of the ring is half of the diameter, which is 5.0 cm = 0.05 m. Plugging in the values, we have: V = (8.99 × 10^9 N m²/C²) * (3.0 × 10^-9 C) / 0.05 m. Calculating this expression will give us the electric potential at the center of one of the rings.

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The additional volume of ethanol that can be put into the tank is 0.0136 m³.

The given informations are,

Part A

When the tank and its contents have cooled to 20.0 °C, the volume of ethanol decreases due to the decrease in temperature.

Let's assume the volume of ethanol at 33.0 °C be V1 and at 20.0 °C be V2 and coefficient of cubical expansion of ethanol be α.

From the temperature coefficients of cubical expansion, we can say that the volume of ethanol decreases with decrease in temperature.

So, the additional volume of ethanol which can be put into the tank is,

Additional volume = V1 - V2

The volume of ethanol changes due to the change in temperature,

V2 = V1 / [1 + α (T2 - T1)]

where T1 and T2 are the initial and final temperatures of the ethanol in degree Celsius.

The coefficient of cubical expansion of ethanol, α = 1.12 × 10^-3 / °C.

Now, let's substitute the given values in the above equation:

V2 = 1.60 m³ / [1 + (1.12 × 10^-3 / °C) × (33.0 °C - 20.0 °C)]

V2 = 1.5864 m³

Therefore, the additional volume of ethanol that can be put into the tank when the tank and its contents have cooled to 20.0 °C is,

Additional volume = V1 - V2= 1.60 m³ - 1.5864 m³

                              = 0.0136 m³

Hence, the additional volume of ethanol that can be put into the tank is 0.0136 m³.

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plants

i hope its right and have a nice day

Answer:

number 1

Explanation:

A source emits monochromatic light of wavelength 549 nm in air. when the light passes through a liquid, its wavelength reduces to 433 nm, the liquid's index of refraction is approximately 1.269.

The index of refraction (n) of a medium can be calculated using the formula

n = λair / λmedium

Where λair is the wavelength of light in air and λmedium is the wavelength of light in the medium.

Given:

λair = 549 nm

λmedium = 433 nm

Substituting these values into the formula, we get

n = 549 nm / 433 nm

Simplifying the calculation

n = 1.269

Therefore, the liquid's index of refraction is approximately 1.269.

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Answer:

The moon doesn’t have light of its own, the moon lights up because of the sun. So at night, as the light of the sun doesn't reach the grass directly because of the moon, it doesnt reflect any color off the grass, and so our eyes detect grass as black.

Explanation:

Sun appears white, but it is made up of the colors: red, orange, yellow, green, blue, indigo, and violet. When white light hits an object, it absorbs some colors and reflect the others. Grass appears green because it absorbs all the wavelengths except green. Green is reflected off the grass, so we see grass as green.

Answer:

Energy moves between the particle of the medium.

Explanation:

Answer:

Nepal is one of the least developed countries. Solar power is well-founded than electricity. It's better to use solar power because it's a clean resource, the sun provides more energy than we will ever need.

Explanation:

The change in potential energy of the spring system is 15.6 x 10³J.

Mass of the disc, m = 20 kg

Velocity of the disc, v = 3 m/s

Spring constant of the spring, k = 200 N/m

Angular displacement of the disc, x = 2 revolutions = 2 x 2π = 4π radians

The potential energy that is stored when an elastic object is stretched or compressed by an external force, such as the stretching of a spring, is known as elastic potential energy. It is equivalent to the effort required to extend the spring, which is dependent on both the length of the stretch and the spring constant k.

The expression for the elastic potential energy of the spring is given by,

PE = 1/2 kx²

PE = 1/2 x 200 x (4π)²

PE = 1.57 x 10⁴J

The kinetic energy of the disc is given by,

KE = 1/2 mv²

KE = 1/2 x 20 x 3²

KE = 90 J

Therefore, the change in potential energy is,

E = 1.57 x 10⁴- 90

E = 15.6 x 10³J

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