PLEASE HELP!!


AR stands for Radio Detection And Ranging. How does this technology work?



1: Radio waves are sent by a transmitter and the receiver picks them up at location down-range.



2: Radio waves are sent by a transmitter and reflect back to a receiver when they run into an object

A light-year is a unit of distance, specifically the distance that light travels in one year.

Light travels at a speed of approximately 299,792 kilometers per second (or about 186,282 miles per second) in a vacuum. Therefore, to determine which planet is 20 light-years away from Earth, we need to identify a planet located at a distance of approximately 20 times this speed of light.

As of my knowledge cutoff in September 2021, no known exoplanets have been directly observed and confirmed to be located exactly 20 light-years away from Earth. However, there are numerous exoplanets that have been discovered within a range of distances from Earth.

Some notable exoplanets discovered within approximately 20 light-years of Earth include:

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Radii is a vital feature of the elements, and it can be useful in determining the characteristics of elements in various chemical and physical processes. The radii of atoms and ions of the same element differ due to their various charge and mass characteristics.

Atomic and ionic radii increase as you move down a group on the periodic table, and decrease as you move across a period from left to right due to increased nuclear charge, making the electrons closer to the nucleus. The size of an atom and ion also changes due to the number of electrons charge, and electronic configuration.In order of increasing radius, the arrangement of \(Ne, F-, O2-, Br-, Rb\) is given as follows:

\(Ne < F- < O2- < Br- < Rb+\)

Rb+ has the smallest radius due to its large nuclear charge and fewer electrons in the valence shell.

As a result, they are larger than Rb+. O2- has more electrons than Ne and is the largest among the given ions and atoms. It is important to note that in certain conditions, the trends in radii may not be valid because of hybridization and other factors. Nonetheless, this arrangement is valid for the given ions and atoms.

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To determine the time taken to travel to Los Angeles you should consider the distance traveled.

The displacement of an object is known as the change in position of the object.

It is also the shortest distance between the final position and initial position of an object.

Displacement is a vector quantity because it has both direction and magnitude.

Distance is scalar quantity that measures the space between two points. It is a scalar quantity because it has only magnitude.

To determine the time taken to travel to Los Angeles we consider the speed of the motion, and the distance traveled.

time of motion = distance traveled/speed

Thus, To determine the time taken to travel to Los Angeles you should consider the distance traveled.

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The tornado has the angular velocity of 0.568 revolutions per second. It is obtained by using the formula for angular velocity.

The formula for the angular velocity of the tornado can be found by:

ω = v/r

Where

We have a tornado with a diameter of 49.0 m and the linear velocity of wind of 315 km/h. Find the angular velocity in revolutions per second!

Let's find its radius and convert the unit of linear velocity.

The radius of the tornado can be found by dividing its diameter by 2:

r = d/2 = 49.0/2 = 24.5 m

The linear velocity in m/s is

315 km/h = 315 × 1,000 × 1/3,600 m/s

315 km/h = 87.5 m/s

We can rearrange the formula above to solve for angular velocity:

ω = v/r
ω = 87.5 m/s / 24.5 m
ω ≈ 3.57 rad per second

Remember that 1 revolution = 2π radians. So, we get angular velocity in rev per second:
ω = 3.57 rad/s

ω = 3.57/2π

ω ≈ 0.568 rev/s

Hence, the angular velocity of the tornado at its peak is approximately 0.568 revolutions per second.

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Answer:

actually you can't find it without acceleration.

you need to use one of these three equations

1- Vf = Vi + at

2- 2ad = Vf^2 - Vi^2

3- d = Vit + 1/2 at^2

Answer:

HOPEFULLY i am correct but i say its D. Hopefully I helped!✨

Answer: It can be A or B

Explanation: In physics, motion is the phenomenon in which an object changes its position over time. Motion is mathematically described in terms of displacement, distance, velocity, acceleration, speed, and time.

a) The wavelength of the radiation that is most intense can be calculated using Wien's Law. The formula is given by: λmaxT=2.898 × 10^-3 nmK. The ratio of their luminosities Lsirius/Lsun is 24.99.

where λmax is the wavelength of the most intense radiation, and T is the temperature. The surface temperature of Sirius, T = 9940 K. Using the above formula, λmax can be calculated as:λmax=2.898 × 10^-3 nmK / 9940 K= 0.0002915 nm. This corresponds to the ultraviolet part of the electromagnetic spectrum. b) (2 pts) Given that the radius of Sirius is 1.71 times the radius of the Sun, and the Sun's surface temperature is 5777 K, The ratio of their luminosities can be calculated using the formula: L=4πR^2σT^4where L is the luminosity, R is the radius, T is the temperature and σ is the Stefan-Boltzmann constant. Let's calculate the ratio of their luminosities: L sirius/L sun=[4π(Rsirius)^2σTsirius^4] / [4π(Rsun)^2σTsun^4]= (Rsirius / Rsun)^2(Tsirius / Tsun)^4= (1.71)^2(9940 / 5777)^4= 24.99. The ratio of their luminosities Lsirius/Lsun is 24.99.

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The statements which describe some of the original ideas proposed about the universe during the big bang include:

This is the theory about the formation of the universe which states that a single point began to expand which resulted in its formation.

This was as a result of observations and ideas which can be seen mentioned above.

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Answer:

B. The universe was opaque.

D. The universe was very hot and dense.

E. The universe expanded from a single point.

Explanation:

Answer:

A. Good conductor of heat

Explanation:

The group 10 elements are a group of chemical elements as part of VIII elements and they include nickel, platinum, palladium etc. These group of chemical elements are all d-block transition metals, highly ductile and lustrous and are mostly white to light grey in color.

The statement which most likely describes a Group 10 element is that they are good conductor of heat because they have some of the chemical and physical properties of metals.

Answer:

Water gains energy during evaporation and releases it during condensation in the atmosphere

Explanation:

In the water cycle, heat energy is gained or lost by water as it undergoes various processes in the cycle.

In evaporation, water molecules gains energy because the molecules of water vibrate faster and become more energetic. Hence they are able to escape into the atmosphere from the surface of the liquid.

In condensation, the molecules of gaseous water looses energy and becomes liquid.

Hence, water gains energy during evaporation and releases it during condensation in the atmosphere.

Answer:

K12 HE HE

Explanation:

The magnitude of current flowing through the conductance is:
(a) 0.2 A.

(b) 100 A.

(c) 10 e^(-2t) A.

(d) 0.5 sin(5t) A.

(e) 0 A.

To determine the magnitude of the current flowing through a conductance, we need to use Ohm's Law, which states that the current (I) flowing through a conductor is equal to the voltage (V) across it divided by its conductance (G).

Ohm's Law equation: I = V / G

Given the voltage across the conductance in each case, we can calculate the current magnitude using the given conductance values.

(a) Voltage = 2 mV, Conductance = 10 mS (10 ms)

I = (2 mV) / (10 mS)

I = 0.2 A

The magnitude of the current flowing through the conductance is 0.2 A.

(b) Voltage = -1 V, Conductance = 10 mS (10 ms)

I = (-1 V) / (10 mS)

I = -100 A

The magnitude of the current flowing through the conductance is 100 A.

(c) Voltage = 100 e^(-2t) V, Conductance = 10 mS (10 ms)

I = (100 e^(-2t)) / (10 mS)

I = 10 e^(-2t) A

The magnitude of the current flowing through the conductance is 10 e^(-2t) A.

(d) Voltage = 5 sin(5t) V, Conductance = 10 mS (10 ms)

I = (5 sin(5t)) / (10 mS)

I = 0.5 sin(5t) A

The magnitude of the current flowing through the conductance is 0.5 sin(5t) A.

(e) Voltage = 0 V, Conductance = 10 mS (10 ms)

I = (0 V) / (10 mS)

I = 0 A

The magnitude of the current flowing through the conductance is 0 A.

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T=d/s or distance/speed

THE ASNWER IS A

All for the sattement A, B, and E is True and satement C, D, and F is False where you learned about astronomy from space.

A .The Compton, Chandra and Spitzer telescopes are all examples of space telescopes.

-This statement is True.

B. Most types of electromagnetic waves are not visible to ground-based telescopes.

-This statement is True.

C. Enough infrared energy gets to Earth's surface that infrared telescopes do not need to be put in orbit.

-This statement is False.

D. Cosmic rays are the absolute highest-energy type of electromagnetic wave.

-This statement is False.

E. The Hubble Space Telescope makes observations at all wavelengths.

-This statement is True.

F. Earth's atmosphere has no effect on visible light, so there is no need to place an optical telescope in space.

-This statement is False.

Astronomy is the scientific study of celestial objects and phenomena, including stars, planets, galaxies, and the universe as a whole. Astronomers use various tools and techniques, such as telescopes, spectroscopy, and astrophysics, to observe and understand the properties and behavior of these celestial objects.

Through the study of astronomy, scientists have discovered many fascinating things about the universe, such as the existence of black holes, the age and size of the universe, and the formation and evolution of stars and galaxies. Astronomy has also played a significant role in advancing our understanding of fundamental physics, including the laws of gravity and the behavior of matter and energy at extreme conditions.

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The system described by the transfer function G(s) = -co² s² + 2a + w², with a damping ratio of 1.3 and a natural frequency of 0.5, has an overdamped unit step response. So, the correct option is (E)

The transfer function of the system is given as G(s) = -co² s² + 2a + w², where co represents the damping ratio, a represents an arbitrary constant, and w represents the natural frequency of the system. We are given that the natural frequency is 0.5 and the damping ratio is 1.3.

To determine the type of unit step response, we need to analyze the damping ratio (co) in relation to the critical damping value (co_critical).

The critical damping ratio (co_critical) is defined as the value where the system is on the threshold between being overdamped and underdamped. It is given by the formula co_critical = 2 * sqrt(a * w²).

In our case, the natural frequency (w) is 0.5, so we can calculate co_critical as follows: co_critical = 2 * sqrt(a * 0.5²).

Since the damping ratio (co) is given as 1.3, we can compare it with co_critical to determine the type of unit step response.

If co > co_critical, the system is considered overdamped (Option E).

If co = co_critical, the system is considered critically damped (Option D).

If co < co_critical, the system is considered underdamped (Option C).

Based on the given values, we can determine that the system is overdamped (Option E) because the damping ratio (1.3) is greater than the critical damping ratio.

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Answer:

2 x 10^(-5)

Explanation:

The linear expansivity α can be calculated using the following equation:

Where ΔL is the change in length, ΔT is the change in temperature and L is the original length of the metal. So, replacing the values, we get:

Then, solving for α, we get:

Therefore, the linear expansivity of the metal is 2 x 10^(-5)

As light goes from water up high, the recurrence diminishes. Even though the speed of light remains the same, lower frequency causes the light to bend towards the normal (a smaller angle). Option B is correct.

In a dense medium, light travels more slowly, causing the bending. Refraction occurs when light enters water. Light is bent toward the normal as it moves from less dense air to more dense water. The light emission would seem to twist at the outer layer of the water.

Light refracts at whatever point it goes at a point into a substance with an alternate refractive file (optical thickness). This shift in course is brought about by an adjustment of speed. When light enters water from air, for instance, it slows down and continues to travel in a different angle or direction.

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Answer:

Electrical>thermal>light

Explanation:

Answer:

Formula =   P1V1 = P2V2

                   7.5 x 100000 = p2 X 11

                   750000 / 11 = P2

                      P2 = 68181.81 Pa

                                  or

                            =  68.18181 kPa

Explanation:

In a series circuit, the current remains the same throughout the circuit due to the conservation of charge. However, the voltage across each component can vary depending on the component's impedance.

In the case of a resistor, the voltage drop across it is proportional to the current flowing through it according to Ohm's law. In an inductor, the voltage drop across it is proportional to the rate of change of current flowing through it due to its inductance. Similarly, in a capacitor, the voltage across it is proportional to the charge stored on it due to its capacitance. So, even though the current remains constant, the voltage across each component can vary depending on its impedance.

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The coefficient of kinetic friction between the bag and the ground is found to be 0.0251. It represents the ratio of the frictional force to the normal force acting between them.

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Answer:

4b: comets

5a: supercluster

5b: they just changed 4b's solar system for milky way. I think it is still comets. if not, then just say black holes.

A plant growing towards a light source is an example of an organism of Phototropism

Let us find first the forces at 1, 2 & 3 points.

We know that ke= 8.99 * 109N.m2 / C2

The forces are: -

F1 = keq1q2 / r212 = {8.99 * 109N.m2 / C2} * {10 * 10-6 C} * {40 * 10-6 C} / {10 * 10-2 m}2

F1 = 359.6 N

F2 =keq1q3 / r213 = {8.99 * 109N.m2 / C2} * {10 * 10-6 C} * {30 * 10-6 C} / {30 * 10-2 m}2

F2 = 29.96 N

F3 = keq2q3 / r213 = {8.99 * 109N.m2 / C2} * {40 * 10-6 C} * {30 * 10-6 C} / {20 * 10-2 m}2

F3 = 269.7 N

Now,

The net force on q1 is F1 – F2,

i.e. F1 + F2 = 359.6 + 29.96

F(q1) = 389.56 N to the left

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Answer: last one radio waves

Or d

Explanation:

Answer:

infrared

Explanation:

ed2020

Answer:

Astronauts who are orbiting the Earth often experience sensations of weightlessness. These sensations experienced by orbiting astronauts are the same sensations experienced by anyone who has been temporarily suspended above the seat on an amusement park ride. Not only are the sensations the same (for astronauts and roller coaster riders), but the causes of those sensations of weightlessness are also the same. Unfortunately however, many people have difficulty understanding the causes of weightlessness.

Answer:

B. Km/s/hr

Explanation:

Here, 120m far will the car skid with locked brakes if it were traveling at 150 km/hr.

Correct option is D. 120m.

The distance a car will skid when brakes are locked is directly dependent on its speed. To illustrate this, if a car travelling at 50 km/hr with locked brakes skids 20 m, then if the same car were travelling at 150 km/hr, then it would skid 120 m.

This is because the faster the car is travelling, the greater its kinetic or momentum, and the longer distance it will skid when brakes are locked. Momentum is the product of speed and mass, and upon braking, kinetic energy is converted to friction to reduce speed.

A locked brake does not convert energy to friction, it merely prevents any further change of speed, so the distance the car skids is a function of the momentum it has prior to locking the brakes. This example shows that the longer distance the car skids is directly related to the speed it had prior to braking.

Correct option is D. 120m.

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The rhetorical device used by Sojourner Truth is rhetorical question.

Rhetorical device refers to the way an author uses to pass information to the listener, in order to persuade them to buy into his opinion.

For example, the phrase ain't I a woman, is repeated by the sojourner truth, in order to encourage the audience to think about the significance of the arguments that have been presented.

By asking this, Sojourner Truth encourages the audience to consider the treatment given to women, and in particular black women, and wonder whether it is fair.

The question is not meant to be answered, but instead it is meant to encourage the audience to reflect on a particular topic.

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if 4 different amplitudes are used, the numbers of bits that can be transmitted with each amplitude change is 2 bits.

Distance between the wave's resting position and its highest displacement is known as amplitude. Frequency is the quantity of waves that pass by a particular place each second.

The distance between the center line (or the still position) and the top or bottom of a wave's crest or trough is known as the amplitude (). Be cautious when using this amount because a diagram may not always show the center line. Meters are used to measure amplitude ( ).

For example:

If there is 4 amplitudes, it will be: 00,01,10,11 then  2 bits

If there is 8 frequencies it will be: 000,001,010,011 ,100,101,110, 111 and then  3 bits

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See full question below

With Amplitude Shift Keying (ASK), if 4 different amplitudes are used, how many bits can be transmitted with each amplitude change?