at what distance and redshift does an object of 1 kpc across subtend an angle of 1 arc second?

The bullet travels approximately 20.3 m before you hear the report of the rifle.

To determine the distance the bullet travels before you hear the report of the rifle, we need to calculate the time it takes for the sound to reach you.

First, let's calculate the time it takes for the bullet to reach you. Since the bullet is fired horizontally, it only experiences horizontal motion. The horizontal distance it travels is the distance between you and your friend, which is 20.3 m.

Using the equation:

distance = velocity × time

We can rearrange the equation to solve for time:

time = distance / velocity

time = 20.3 m / 891.6 m/s

time ≈ 0.0228 s

Now, let's calculate the distance the sound travels in 0.0228 seconds. The speed of sound in air at 22°C is approximately 343 m/s.

distance = velocity × time

distance = 343 m/s × 0.0228 s

distance ≈ 7.82 m

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Answer:

Explanation:

The sealed bottle serves as an open system for the water molecules, thus heat energy can be exchanged with its surroundings. When the bottle is placed in a warm environment, there would be a gradual increase in the thermal energy of the molecules of water due to a change in the temperature of its surroundings.

Thus, the molecules of water closer to the boundary of the bottle absorbs heat, becomes lighter and changes position. This gradual process continues until all molecules attains an average temperature which equals that of the surroundings of the bottle.

Therefore, both the thermal energy and temperature of the water increases.

Answer:

Its not getting as hot because water and soap can act as a lubricant and it would not heat up easily because of the soapy water.

Answer:

there is less friction when your hands are soapy

Explanation:

Correct option is C, Centripetal force remains constant.

Centripetal Force -

Any force that changes the direction of motion toward the center of a circular motion is known as a centripetal force. The part of the force that produces the centripetal force is the part that is perpendicular to the velocity.

A net force that keeps an object moving in a circular motion is known as a centripetal force.

Centripetal force has the formula =mv2r. The newton or kgms2 is the measure of force.

A centripetal force is applied to any item travelling in a circle (or along a circular path). In other words, the object is being physically pushed or pulled in the direction of the circle's center. This is the necessary centripetal force.

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The initial velocity of the rifle bullet is 2760 ft/s. It comes to rest after hitting the tree in 0.13 seconds.

We are supposed to find the acceleration of the rifle bullet given the initial velocity and time taken to come to rest.

Therefore, we can use the formula to calculate acceleration (a) from the given values of velocity (v) and time taken (t) which is given as follows:

a = (v - u) / t

Where,u = Initial Velocity

v = Final Velocity

a = acceleration

t = time taken

Now, substituting the given values of u, v, and t in the above formula, we get:

a = (v - u) / ta

= (0 - 2760) / 0.13

We get the acceleration of the rifle bullet as - 21230.76923076923 ft/s² (Rounding to 2 decimal places, it is -21230.77 ft/s²).

The acceleration of the rifle bullet is negative because it's coming to rest, indicating a deceleration.

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Answer: D. Lever

Explanation: The biceps muscle provides the effort (force) and bends the forearm against the weight of the forearm and any weight that the hand might be holding. Many muscle and bone combinations in our bodies are of the Class 3 lever type.

how many washers or paper clips can be picked up by each magnet. The one which picks up the most is the strongest.

-Slowly bring each magnet close to a magnetic material (such as an iron pin). The one which attracts the pin from the farthest distance is the strongest.

-Construct a device such as in class (place a tongue depressor between two plastic cups, place each magnet on top of the tongue depressor, and then suspend a paperclip beneath it to see how many washers each magnet can hold

Answer:

gamma rays

Explanation:

hope it helps

Answer:

Following are the solution to the given points:

Explanation:

In this question, some of the values are missing, that's why its solution can be defined as follows:

In point a:

Density of air \(\rho_{air} =1.29 \frac{kg}{m^3}\\\\\)  

Density of helium \(\rho_{helium} =0.178 \frac{kg}{m^3} \\\\\)

The volume of the helium balloon \(V= 2L\)

\(\to V= 2 \times 10^{-3}\)

Formula:

\(F_B = e_a V g\\\\\)

\(= 1.29 \times 2 \times 10^{-3} \times 9.81\\\\ = 0.0253098 \ N\)

where g is the acceleration due to gravity

In point b:

\(m_g= 1.5 \ g\)

Formula:

\(F_{net}=F_B - (m_r + \rho_h \ v )g\)

       \(= 0.0253098 - (1.5 \times 10^{-3} + 0.178 \times 2 \times 10^{-3} \times 9.81)\\\\= 7.10244 \times 10^{-3} \ N\)

3. The acceleration of the bicycle is 0.36 m/s²

4. The distance traveled by the person is 2.25 m

5. The initial speed of the car is 7 m/s

The acceleration of the bicycle can be obtained as follow:

v² = u² + 2as

Inputting the given parameters, we have:

6² = 0² + (2 × a × 50)

36 = 0 + 100a

36 = 100a

Divide both side by 100

a = 36 / 100

a = 0.36 m/s²

Thus, the acceleration is 0.36 m/s²

The distance traveled by the person can be obtain as follow:

v² = u² + 2as

1.5² = 0² + (2 × 0.5 × s)

2.25 = 0 + s

s = 2.25 m

Thus, we can conclude that the distance is 2.25 m

The initial speed of the car can be obtain as follow:

v² = u² + 2as

15² = u² + (2 × 2 × 44)

0 = u² + 176

Collect like terms

u² = 225 - 176

u² = 49

Take the square root of both sides

u = √49

u = 7 m/s

Thus, the initial speed of the car is 7 m/s

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Answer:

a) The distance covered by the moving object is approximately 18.85 km

b) The magnitude of the displacement of the object is 0 (no displacement)

Explanation:

From the drawing, we have;

The sale of the drawing is 1 unit = 1 km

The radius of the circle in the drawing along which the object moves = 3 units

Therefore;

The radius of the circle along which the object moves, r = 1 km/unit × 3 units = 3 km

a) The distance covered by the object that moves from point A to B to C to D and finally to A is equal to the circumference of the circle

Therefore;

The distance covered by the moving object, d = 2·π·r

By pugging the value for r = 3 km

d = 2 × π × 3 km = 6·π km ≈ 18.85 km

The distance covered by the moving object, d ≈ 18.85 km

b) The displacement = The object's change in position

The initial position of the object = Point A

The final position of the object = Point A

Therefore, the displacement of the object, A = No displacement = 0 (No difference between the initial and final location of the object

Answer:

food chain is a process of how food is transported to the plant and then to the animal that eats the animal. there are primary, secondary, and tertiary and then decompose.

Explanation:

plz mark my answer as the brainliest

Answer:

A hierarchical series of organisms each dependent on the next as a source of food.

Explanation:

Hope this helps!! plz mark brainliest-Lily ^_^ ( food chain also known as the Circle Of Life)

Correct value of kinetic energy is 704 × 10³ J

Answer:

v = 147.18 m/s

Explanation:

At any point/moment during the fall, the sky diver will possess kinetic energy with the formula;

KE = ½mv²

Where;

m is mass

v is velocity

We are given;

m = 65 kg

KE = 704 × 10³ J

Thus;

704 × 10³ = ½ × 65 × v²

v² = (2 × 704 × 10³)/65

v² = 21661.53846153846

v = √21661.53846

v = 147.18 m/s

Answer:

Solar energy is radiant light and heat from the Sun that is harnessed using a range of technologies such as solar power to generate electricity, solar thermal energy including solar water heating, and solar architecture.

The horizontal distance travelled by the football is 3.1 m.

The angle of projection of the football is calculated as follows;

tan ( θ ) = Vy / Vx

where;

tan ( θ ) = 5 / 3

tan ( θ ) = 1.667

θ = arc tan (1.667)

θ = 59⁰

The resultant velocity of the ball is calculated as follows;

v = √ (Vx² + Vy²)

v = √ (3² + 5²)

v = 5.83 m/s

The horizontal distance travelled by the football is calculated as follows;

x = v² sin(2θ) /g

where;

x = [ (5.83)² sin(2 x 59) /9.8 ]

x = 3.1 m

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Water will rise by 1.47 cm in a silver tube of the same radius.

Capillary action is the phenomenon of a liquid rising in a narrow tube due to the combination of adhesive and cohesive forces. The height to which the liquid rises depends on the radius of the tube and the surface tension of the liquid.

In this problem, water is raised by capillary action to a height of 8.95 cm in a glass tube.

To determine the height to which the water will rise in a paraffin tube or a silver tube of the same radius, we need to use the angle of contact between the liquid and the solid surface.

The angle of contact is the angle at which the liquid meets the solid surface.

It depends on the nature of the liquid and the solid. If the angle of contact is less than 90 degrees, the liquid will wet the surface and rise in the tube.

If the angle of contact is greater than 90 degrees, the liquid will not wet the surface and will be pushed down.

The table given in the problem provides the angle of contact for water with glass, paraffin, and silver. We can use these angles to calculate the height to which water will rise in tubes of the same radius.

For a paraffin tube, the angle of contact between water and paraffin is 106 degrees. Since this angle is greater than 90 degrees, water will be pushed down in a paraffin tube.

The height to which water will be pushed down can be calculated using the formula:

h = (2T cos θ) / (ρgr)

where T is the surface tension of water, θ is the angle of contact, ρ is the density of water, g is the acceleration due to gravity, and r is the radius of the tube.

Substituting the values, we get:

h = (2 x 0.0728 N/m x cos 106°) / (1000 kg/m³ x 9.81 m/s² x 0.5 x 10⁻² m) = -0.51 cm

Therefore, water will be pushed down by 0.51 cm in a paraffin tube of the same radius.

For a silver tube, the angle of contact between water and silver is 90 degrees. Since this angle is less than 90 degrees, water will wet the surface and rise in a silver tube. The height to which water will rise can be calculated using the same formula:

h = (2T cos θ) / (ρgr)

Substituting the values, we get:

h = (2 x 0.0728 N/m x cos 90°) / (1000 kg/m³ x 9.81 m/s² x 0.5 x 10⁻² m) = 1.47 cm

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Answer:

You decide to drop two different objects from a tall building and discover that one of the objects lands on the ground five seconds before the other object. What can you conclude? Newton's second law is not valid because each object should experience the same force of gravity and therefore should land at the same time.

Explanation:

You decide to drop two different objects from a tall building and discover that one of the objects lands on the ground five seconds before the other object. What can you conclude? Newton's second law is not valid because each object should experience the same force of gravity and therefore should land at the same time.

You decide to drop two different objects from a tall building and discover that one of the objects lands on the ground five seconds before the other object. What can you conclude? Newton's second law is not valid because each object should experience the same force of gravity and therefore should land at the same time.

The internal resistance of the battery is 0.049 \(\ohm\)Ω

To calculate the internal resistance we are using the formula,

E = V + Ir

where,

E = Emf of the car battery.

V = The terminal voltage drops of the car battery.

I = The current floes through the battery.

Here,

E = 12.6 V.

V = 8.34 V.

I = 86.2 A.

We have to calculate the value of internal resistance = r

Now we put the known values in the above equation we get,

E = V+Ir

Or, Ir= E-V

Or, r= \(\frac{E-V}{I}\)

Or, r= \(\frac{12.6-8.34}{86.2}\)

Or, r = 0.049 \(\ohm\)Ω

So from the above calculation we can conclude that the internal resistance of the battery is \(\ohm\)0.049Ω

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Resistance through a wire is affected by several factors including conductivity, thickness, length, and temperature.

Conductivity refers to the ability of a material to conduct electricity. The higher the conductivity of a wire, the lower its resistance. This is because a highly conductive wire allows for a larger flow of electrons, making it easier for electricity to pass through.
Thickness also affects resistance. A thicker wire has a lower resistance compared to a thinner wire because it has more surface area for the electrons to flow through. This results in less resistance as the electrons do not have to struggle to pass through a narrow space.
The length of a wire also plays a role in resistance. A longer wire has a higher resistance compared to a shorter wire because the electrons have to travel a longer distance, which results in more collisions with atoms and ions in the wire, thereby impeding the flow of electricity.
Temperature can also affect resistance. Generally, as the temperature of a wire increases, its resistance increases too. This is because the atoms and ions in the wire gain more energy when heated, which results in more collisions with electrons, making it more difficult for them to pass through the wire. However, there are some materials that exhibit a decrease in resistance with an increase in temperature, such as superconductors.
In summary, conductivity, thickness, length, and temperature all affect resistance through a wire. A wire with high conductivity, thickness, and short length, and a low temperature will have low resistance.

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Answer:

5 Stars

Explanation:

Because every Star from 1 to 5 vary energy consumption of the electrical device...So 5 star product uses a very less energy compared to 1 star product...

Hope it is helpful

There are 0 to 5 star are used in the star rating label of electrical appliance.

The appliance is more energy efficient if it has more stars on the Energy Rating Label. To perform at the same level as comparable models of the same size or capacity, efficient appliances require less electricity. A model will use less energy and cost you less to run if it is more energy efficient.

Example a 3-star refrigerator saves a lot more energy compared to a 2 star.

Number of stars in the star rating label of an electrical appliance should be used is five for most efficient electrical device.

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Answer:

Vf = ≈56.436 m/s

Explanation:

We'll need to use the equation:

Vf^2 = Vi^2 + 2aΔx

Plugging in what we know, we get:

Vf^2 = (0)^2 + 2(4.55)(350)

Finally, some algebra:

Vf^2 = 3185

Vf = ≈56.436

A contact lens with a +3.014 diopters power will enable a farsighted woman with a near point of 70.0 cm to see objects clearly at a distance of 27.3 cm.

We have do = 23cm and di = -75cm

So 1/f = 1/do + 1/di = 1/23 + 1/(-75) = .03014

So f = 1/.03014=33.17

So power = 1/0.3317 = +3.014Diopters (converging lens)

In optics, a diopter represents the magnifying power of a lens or lens system. The power of a lens is proportional to unity (one) divided by the focal length (see lens), so the power of a lens in diopters is mathematically equal to 1 meter is divided by the focal length. A healthy human eye can concentrate on an object or picture that is 1/40 of a meter away with an optical power of roughly 40 diopters. A average young person's eye has an additional 20 diopters of adjustment.

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When a knowledgeable amateur astronomer tells you that she has a 14-inch telescope, the number 14 refers to the diameter of the telescope’s objective lens.

A telescope is a device used to view distant objects by utilizing electromagnetic radiation to either magnify their apparent size or gather more light than the human eye can. Telescopes are used for scientific, commercial, and amateur purposes. The telescope comprises an objective lens or mirror and an eyepiece to magnify the images created by the objective. Most telescopes have a viewfinder to make it simpler to aim the telescope precisely at the object of interest. They may also have a motorized mount to track celestial objects as they move across the sky.

Telescopes come in a variety of sizes, designs, and shapes and they range from large observatory telescopes to handheld amateur models. They are often classified into two types, reflecting and refracting telescopes and the size of a telescope is determined by the diameter of its objective lens or mirror. The bigger the diameter, the more light the telescope can collect, and the clearer the image. The diameter of the objective is the most significant aspect of a telescope when it comes to observing the heavens. For instance, a 14-inch telescope has an objective lens with a diameter of 14 inches, this large lens is capable of collecting a lot of light and providing clear images, making it a perfect tool for viewing the night sky.

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Answer: Green Light

Explanation:

The color green has a higher frequency than the color red and the higher the frequency the more energy. If you looks at a rainbow you'll see red on one end and violet on the other. Red has the least energy Violet has the most.

The time required to cover the Moon to a depth of 1.20 meters with micrometeorites.

To find out how long it would take to cover the Moon to a depth of 1.20 meters with micrometeorites, we can calculate the volume of the Moon and then divide it by the volume of one micrometeorite. Let's break down the calculation step by step:

Calculate the volume of the Moon:

The average radius of the Moon is approximately 1.737 ×10⁶ meters. Using the formula for the volume of a sphere, V = (4÷3)πr³, we can calculate the volume of the Moon.

\(V_{moon}\) = (4÷3)π(1.737 × 10⁶)³

Calculate the volume of one micrometeorite:

The diameter of the micrometeorite is given as 1.30 ×10⁽⁻⁶⁾ meters, which means the radius is half of that.

\(r_{meteorite}\) = (1.30 × 10⁽⁻⁶⁾)÷2

Using the formula for the volume of a sphere, V = (4÷3)πr₃, we can calculate the volume of one micrometeorite.

\(V_{meteorite}\) = (4÷3)π((1.30 × 10⁽⁻⁶⁾)÷2)³

Calculate the number of micrometeorites needed to fill the Moon:

To find the number of micrometeorites required to fill the Moon, we divide the volume of the Moon by the volume of one micrometeorite.

\(N_{meteorites}\) = \(V_{moon}\) ÷ \(V_{meteorite}\)

Calculate the time to fill the Moon:

Since one micrometeorite strikes each square meter of the Moon each second, we can equate the number of micrometeorites needed to fill the Moon to the number of seconds it would take.

Time = \(N_{meteorites}\) ÷ (1 m²/s)

Convert seconds to years:

Finally, we convert the time in seconds to years by dividing by the number of seconds in a year (assuming 365.25 days in a year and 24 hours in a day).

\(Time_{years}\) = Time ÷ (365.25 days/year × 24 hours/day × 3600 seconds/hour)

Performing these calculations will give us the time required to cover the Moon to a depth of 1.20 meters with micrometeorites.

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Using a cable with a tension of 1350 N , a tow truck pulls a car 5.00 km alone a horizontal roadway. Therefore,

(a) Cable work: 6,750,000 J horizontally.

(b) Cable work: 6,308,250 J at 35.0° above horizontal.

(c) No work by gravity.

To calculate the work done by the cable in each scenario, we need to consider the angle between the direction of the force applied and the displacement.

(a) If the cable pulls horizontally (0° above the horizontal):

In this case, the angle between the force and the displacement is 0 degrees, so the work done can be calculated as:

Work = Force * Displacement * cos(Ф)

Work = 1350 N * 5000 m * cos(0°)

Work = 1350 N * 5000 m * 1

Work = 6,750,000 J

The cable does 6,750,000 Joules of work on the car when it pulls horizontally.

(b) If the cable pulls at 35.0 degrees above the horizontal:

In this case, the angle between the force and the displacement is 35.0 degrees, so the work done can be calculated as:

Work = Force * Displacement * cos(Ф)

Work = 1350 N * 5000 m * cos(35.0°)

Work = 1350 N * 5000 m * 0.819

Work = 6,308,250 J

The cable does approximately 6,308,250 Joules of work on the car when it pulls at 35.0 degrees above the horizontal.

(c) The work done by gravity on the car is zero because gravity acts vertically downward, perpendicular to the displacement along the horizontal roadway. Therefore, the gravitational force does not contribute to the work done on the car in this scenario.

In both cases (a) and (b), the cable does the same amount of work on the tow truck as on the car since they are connected by the cable. So the work done by the cable on the tow truck would be equal to the values calculated above: 6,750,000 J in case (a) and 6,308,250 J in case (b).

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Using the Bohr model, we can calculate what photons were absorbed giving transitions in the Hydrogen atom; the correct answer is

The photon  to be absorbed are: 2.00 10⁻¹⁹ J, Balmer serie in the visible

                                                       1.00 10⁻¹⁹ J, Paschem serie in infrared

The other photons cannot be absorbed

The energy of the photons is given by the PlanK equation

             E = h f

where h is Plank's constant and f is the frequency of the photons

For the absorption by an atom, the photons must have an energy equal to greater than the difference in energy of the levels involved, in case the energy of the detachment of an electron must be greater than or equal to the ionization energy.

In this exercise it is not indicated which specific atom is being analyzed, but the most common of them is Hydrogen.

The ionization energy of hydrogen is

        E = 13.6 eV (1.6 10-19 J / 1 eV) = 21.76 10-9 J

in atomic transitions it is ususal to work in units of lectronVolts and if necessary reduce to Joule.

when checking the given values ​​none of these photons can ionize the hydrogen atom.

The energy of the atomic levels is given by the Bohr model for the hydrogen atom

             E = \(- \ \frac{13.606}{n^2}\)   [eV]

where n is a number in between and the amount in brackets are units , therefore the transition between two levels is given by

            ΔE = 13.606 (  \(\frac{1}{n_o^2} - \frac{1}{n_f^2}\) )    [eV]

where n₀ and n_f are integers corresponding to the initial and final states of the transition, in the table we see the values ​​for several transitions

n₀    n_f     ΔE [eV]      ΔE  [10⁻¹⁹ J]

1       2         10.2            16.3

2      3          1.89             3.0

3      4          0.66             1.1

let's compare these results with the energies of the incident photons

a) the photon of 2.00 10⁻¹⁹ j

can give transition between the state n = 2 and n = 3 that corresponds to the Balmer series, in the visible of the electromagnetic spectrum

b) the photon of 1.00 10⁻¹⁹ J

It is absorbed giving transitions between levels n = 3 to n = 4 which corresponds to a  Paschem series in the infrared of the electromagnetic spectrum

c) photons 8 10-19, 7 10-19 and 9 10-19 J

they cannot be absorbed by the hydrogen atom and they do not correspond to any permitted transition according to the Bohr model.

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The action spectrum is broader than the absorption spectrum because the action spectrum represents the overall efficiency of photosynthesis, while the absorption spectrum only shows the wavelengths of light absorbed by pigments.

In the action spectrum, a wider range of wavelengths contributes to photosynthesis, as it takes into account the energy conversion process and the involvement of accessory pigments that can absorb different wavelengths and transfer energy to the main photosynthetic pigments.

This results in a broader action spectrum compared to the absorption spectrum.

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