determine the average emissivity of the filament at (a) 1500 k and (b) 2500 k. also, determine the absorptivity and reflectivity of the filament at both temperatures.

Answer:

I'm pretty sure that the answer is A

Answer:

54 miles.

Explanation:

12 times 4.5.

Answer:

\(\boxed {\tt 54 \ miles}\)

Explanation:

Distance can be found by multiplying the speed by the time.

\(d=s*t\)

The speed is 12 miles per hour and the time is 4.5 hours. Therefore,

\(s= 12 \ mi/hr\\t=4.5 \ hr\)

Substitute the values into the formula.

\(d= 12 \ mi/hr * 4.5 \ hr\)

Multiply. Note that that hours, or "hr" will cancel each other out.

\(d= 12 \ mi * 4.5\)

\(d= 54 \ mi\)

d= 54 miles

The distance covered is 54 miles.

Answer:

tysm

Explanation:

Answer:

OMG THANK U SO MUCH I NEEDED THEMMMMM

The name given to it is "terminal velocity".

In reality, it isn't a velocity, and it doesn't happen in free-fall.

Go figure.

The energy needed to launch an object from the surface of Earth to a height h above the surface is given by E = mgh + (1/2)mv², where m is the mass of the object, g is the acceleration due to gravity, v is the launch speed, and h is the height.

When an object is launched from the surface of Earth to a height h, it gains potential energy and kinetic energy. The potential energy gained is given by mgh, where m is the mass of the object, g is the acceleration due to gravity, and h is the height. The kinetic energy gained is given by (1/2)mv², where m is the mass of the object and v is the launch speed.

The total energy required to launch the object to a height h is the sum of these two energies, which gives E = mgh + (1/2)mv². This expression is important in rocket science and aerospace engineering, as it helps to determine the energy requirements for launching a spacecraft or satellite into orbit or beyond. It also helps to optimize the design and performance of launch vehicles, by minimizing the energy requirements and maximizing the efficiency of propulsion systems.

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Answer:

2 lol

Explanation:

The frequency of vibration of the block supported by two identical parallel vertical springs can be calculated using the following formula:

f = (1 / (2π)) * √(k / m)

The frequency of vibration represents the number of complete oscillations or cycles the system undergoes per unit time. In this case, the block is supported by two identical parallel vertical springs. The frequency of vibration depends on the spring constant (k) and the mass of the block (m).

Given that the springs are identical and have the same spring constant (k), we can consider them as a combined system with an effective spring constant (k_eff) equal to twice the spring constant of a single spring:

k_eff = 2k

Using this effective spring constant, we can calculate the frequency of vibration (f) using the formula mentioned above:

f = (1 / (2π)) * √(k_eff / m)

= (1 / (2π)) * √((2k) / m)

= (1 / (2π)) * √(2k / m)

Simplifying further:

f = (1 / (2π)) * √(2k / m)

= (1 / (2π)) * √(2k) * √(1 / m)

= (1 / (2π)) * √(2k / m)

The frequency of vibration for the block supported by two identical parallel vertical springs is given by the formula f = (1 / (2π)) * √(2k / m), where k is the spring constant and m is the mass of the block.

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Answer:

Charge quantization is the principle that the charge of any object is an integer multiple of the elementary charge.

Explanation:

Of the options listed, only the following statement is correct: Secondary batteries must be rechargeable.

Secondary batteries are rechargeable batteries that can be recharged and used multiple times. They are also known as storage batteries, rechargeable batteries or accumulators. They operate by converting chemical energy into electrical energy and vice versa. The chemical reactions in secondary batteries are reversible, allowing them to be recharged by applying a current to reverse the reaction.

Secondary batteries do not need to consist of exactly two species or metals, nor do they need to generate current spontaneously. They also do not necessarily need to contain a cathode and anode in separate cells, as some types of secondary batteries, such as lithium-ion batteries, use a single cell design.

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Answer:

Atmospheric temperature

The temperature of the atmosphere plays a major role in the heat loss during radiation, if the atmospheric temperature is lower than the radiating temperature then some of the heat is rejected to the atmosphere.

2.Ground surface reflectivity.

This indicates that how much of the rays are reflected from the ground,Metal surfaces, concrete and beach sand can all reflect UV ,while some surfaces do not.The more is the reflection the more will be the intensity of radiation.

3.Presence of pollutants in the atmosphere

Presence of impurities in the atmosphere can become an obstacle in the way of radiation,as rays after striking particles of impurity may get reflected or refracted depending upon the type of impurity present.

Answer:

5000°A

Explanation:

If it is right answer so please mark me as brainleist anwer as ur wish

The answer Cannot determine from the information provided.

Because magnification of lens can not be determined by using focal length only, it requires object or image distance to get the magnification.

What is the magnification of lens?

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The answer is False. A polarized material does not need to have a nonzero net electric charge. Polarization occurs when the positive and negative charges within a material are displaced relative to each other, creating an electric dipole moment.

This can happen in materials such as dielectrics or insulators, which do not conduct electricity. The net electric charge of a polarized material can still be zero, as the overall positive and negative charges remain balanced, but the charges are spatially separated. Polarization plays an important role in phenomena such as capacitance, dielectric constant, and polarization-induced electric fields.

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Answer: A - Gold Foil Experiment

Explanation:

Answer:

A

Explanation: Rutherford's gold foil experiment.

The anticipated time when he will appear again is 5:17 pm

The given parameters;

your speed, \(V_a\) = 3 m/s

the runner's speed, \(V_b\) = 14 m/s

the diameter of the lake, d = 2 miles = 3218.69 meters

The circumference of the lake is calculated as;

\(C = \pi d\\\\C = 3.142 \times 3218.69 = 10,113.12 \ m\)

Apply concept of relative velocity to determine the time, in which he will appear again.

By the time he appears again;

the distance you moved + distance he moved = circumference of the circle

\(V_at + V_bt = 10, 113.12\\\\(V_a + V_b)t = 10,113.12\\\\(3 + 14) t = 10,113.12\\\\17t = 10,113.12\\\\t = \frac{10,113.12}{17} \\\\t = 594.89 \ s = 9.92 \ \min \ \approx 10 \ \min\)

\(t\ \approx \ \ 5:17 \ pm\)

Thus, the anticipated time when he will appear again is 5:17 pm

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Answer:

1. Privacy

-The state or condition of being free from being observed or disturbed by other people.

2. Commitment

-The state or quality of being dedicated to a cause, activity, etc.

3. Profile

-There are multiple answers for this word so I'm not sure which is the one you need.

4. Widow

-A woman who has lost her spouse by death and has not remarried.

5. Aristocrat

-A member of the aristocracy.

6. Affordable

-Inexpensive; reasonably priced.

7. Variable

-A symbol for a value we don't know yet. It is usually a letter like x or y.

Explanation:

The dose equivalent limits for radiation workers are based on the radiation received from the two external and internal sources of radiation.

The dose equivalent limits for radiation workers are established by different national and international regulatory agencies, such as the International Commission on Radiological Protection and the U.S. Nuclear Regulatory Commission.

The limits are outlined to minimize the risk of radiation-induced health effects, such as cancer, while allowing for necessary exposure in various situations, such as in medical treatments or in nuclear power plants.

External sources of radiation contain radiation that comes from outside the body, such as from gamma rays or x-rays.

Internal sources of radiation, on the other hand, come from radioactive materials that are taken into the body through ingestion or inhalation.

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I. System: Woman + barbell + Earth For the system consisting of the woman, the barbell, and the Earth, the terms on the left side of the energy equation (the deltaEsys side) are: deltaEwoman, -Fh, and (1/2)mv2.

An equation is a mathematical statement that expresses the equality of two expressions. It consists of two expressions separated by an equal sign (=). Equations are used to solve a wide range of mathematical problems, from basic arithmetic to complex calculus. Equations can be written using numbers, variables, and various mathematical operations such as addition, subtraction, multiplication, division, and exponentiation.

On the right side of the equation (the Wext side), there are no terms as the energy input is 0.

II. System: barbell only For the system consisting of the barbell only, the terms on the left side of the energy equation (the deltaEsys side) are (1/2)mv2 and -Fh. On the right side of the equation (the Wext side), there are no terms as the energy input is 0.

III. System: barbell + Earth For the system consisting of the barbell and the Earth, the terms on the left side of the energy equation (the Esys side) are (1/2)mv2 and -Fh. On the right side of the equation (the Wext side), there are no terms as the energy input is 0.

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Answer:

t

Explanation:

Answer:

False

Explanation:

Answer:

27.5 km

Explanation:

10 x 2.75 = 27.5

A person can travel upto distance of 27.5 Hours. 10 x 2.75 = 27.5.

Distance is a measurement of how far apart two things or points are, either numerically or occasionally qualitatively. Distance can refer to a physical length in physics or to an estimate based on other factors in ordinary language.

The term is frequently used metaphorically to refer to a measurement of the difference between two similar objects.

The concept of a metric space is used in mathematics to formalize the majority of these conceptions of distance, both literal and figurative.

Therefore, A person can travel upto distance of 27.5 Hours. 10 x 2.75 = 27.5.

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Answer:

Explanation:

For every action (or force), there is an equal and opposite action (or force).

The way in which model B is better than model A is as follows: Model B shows how the atoms in the molecule are connected, but Model A does not (option C).

A structural formula is any of the various diagrammatic representations of the structure of a molecule that shows how its atoms are linked to each other, with what type of bonds, and the presence of any charges.

On the other hand, a chemical formula is a notation indicating the number of atoms of each element present in a compound.

According to this question, two models of the same compound are given. Model A is the chemical formula of the compound while model B is the structural formula.

Therefore, it can be said that model B betters model A being that it shows how each atom of the compound are linked to one another.

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Answer:

C

Explanation:

Answer:

5.0 km/h = 5.0 km/60min

speed = distance/time

distance = speed x time = 5.0km/60min x 19min = 1.6km

Explanation:

The gravitational force is given as:

Plugging the values given we have:

Therefore the answer is B.

Conservation of momentum describes what happens in a collision. When two objects collide, the total momentum of the objects before the collision equals the total momentum of the objects after the collision.

What is Collision?

A collision occurs when two or more objects come into contact with each other, and as a result, they exchange energy, momentum, and/or other physical quantities. Collisions can be either elastic or inelastic, depending on whether or not there is a loss of kinetic energy during the interaction.

Newtons laws of motion can be used to explain events in the natural world, such as how a pencil falls to the floor and how planets revolve around the sun. In the absence of air, all objects fall at the same rate, because the force of earth’s gravity causes objects to accelerate by 9.8 m/s, downwards, towards the ground. Air resistance can eventually counteract the acceleration from gravity. This is why a flat piece of paper falls slowly, but when the same paper is crumpled, it falls quickly. When the upward force of air resistance on an object equals the downward force of gravity on the object, it’s velocity stops increasing. This is called the object’s terminal velocity. Satellites orbit Earth because of gravity. They travel very fast, but with each meter forward that they travel, they decelerate just a tiny bit due to Earth’s gravity. Astronauts in Earth’s orbit experience weightlessness because they are in freefall. Without gravity, satellites would continue in a straight line away from Earth. Newton’s laws also describe what happens in collisions. For example, in a moving car, a passenger is also in motion. When the car comes to a sudden stop, the passenger continues in motion. To protect the passenger from striking the inside of the car, seatbelts, airbags, and other safety features decelerate passengers slowly.

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Complete option to the question:

A. The asthenosphere is broken up into large continental- and ocean-sized plates.

B. Convection currents within the asthenosphere push magma upward to create new crust.

C. Heat from deep within Earth is thought to keep the asthenosphere malleable.

D. The asthenosphere is the repository for parts of the lithosphere that are dragged downward in subduction zones.

Answer: The correct option is A (The asthenosphere is broken up into large continental- and ocean-sized plates.)

Explanation:

Among the components that makes up the earth crust are the lithosphere and the asthenosphere.

The LITHOSPHERE is the outer layer of the earth structure which consists of the upper part of the mantle and the crust.

The ASTHENOSPHERE is a part of the upper mantle just below the lithosphere that is involved in plate tectonic movement and isostatic adjustments. It is denser and weaker layer of the upper mantle which permits the movement of tectonic plates in the lithosphere.

The asthenosphere is the repository for parts of the lithosphere that are dragged downward in subduction zones.Heat from deep within Earth is thought to keep the asthenosphere malleable. And the convection currents within the asthenosphere push magma upward to create new crust. But it is not broken up into large continental- and ocean-sized plates.

Answer:

Johannes Kepler