if the signal strength from an omnidirectional radio source is 100 mw at 10 meters, how strong will it be at 30 meters, ignoring absorptive attenuatio

Answer:

BASE jumping is the recreational sport of jumping from fixed objects, using a parachute to descend safely to the ground. "BASE" is an acronym that stands for four categories of fixed objects from which one can jump: building, antenna, span, and earth (cliff).[1][2] Participants exit from a fixed object such as a cliff, and after an optional freefall delay, deploy a parachute to slow their descent and land. A popular form of BASE jumping is wingsuit BASE jumping.

Explanation:

In contrast to other forms of parachuting, such as skydiving from airplanes, BASE jumps are performed from fixed objects which are generally much lower altitude, and BASE jumpers typically carry only one parachute. BASE jumping is significantly more hazardous than other forms of parachuting, and is widely considered to be one of the most dangerous extreme sports

Answer:

The length of the x-component of v is 2

Explanation:

Vectors in Two Dimensions

A vector in the plane can be represented as its two components in the rectangular coordinates (x,y), assuming its initial point is the origin (0,0).

The vector plotted in the image provided has the components (-2,5).

The x-component is -2 and the y-component is 5.

The length of the component is the magnitude or absolute value of the x-coordinate, thus the length of the x-component of v is 2

Answer: 4K1

Explanation:

Answer:

what???

Explanation:

Answer:

In mY Knowledge

Energy transfer is the movement of energy from one location to another. Energy transformation is when energy changes from one type to another. While energy can be transferred or transformed, the total energy always remains the same.

Hope iT HeLps :D

Answer:

You can tell if energy has been transferred when something works when you put a body of energy in it. For example, you'll know when energy is transferred if you plug a lamp cord into an electric socket and the lamp turns on. Energy is being transferred from the socket to the lamp.  

You can tell when energy is being transformed when it changes from one energy to another. You can know when energy is being transformed when you turn on a stove. Chemical energy transforms into electric energy.

I hope that helps!

If it is correct, may I be brainliest?

The equivalent of the central angle in radians is 2.62 radians.

option B.

The measure of the central angle in radians is calculated as follows;

We known that angle can be measured either in degrees or radians, and we have the following relationship between radians and degrees;

180 degrees = π radians

360 degrees = 2π radians

The given parameter in this question include;

angle = 150 degrees

The equivalent of the central angle in radians is calculated as follows;

θ = 150 / 180  x π

θ = ( 150 / 180 ) x 3.142

θ = 2.62 radians

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The image will form behind the convex mirror, be virtual, upright, and 6 times smaller than the object.

If an object is placed 15 cm in front of a convex mirror with a focal length of 18 cm, the image will form behind the mirror. The image will be virtual, upright, and reduced in size compared to the object. The height of the image can be determined using the mirror equation:

1/f = 1/d_o + 1/d_i

where f is the focal length, d_o is the distance of the object from the mirror, and d_i is the distance of the image from the mirror. Solving for d_i, we get:

d_i = 1/((1/f) - (1/d_o))

Plugging in the values, we get:

d_i = 1/((1/18) - (1/15)) = -90 cm

The negative sign indicates that the image is formed behind the mirror.

To find the height of the image, we can use the magnification equation:

m = -d_i/d_o

where m is the magnification. Plugging in the values, we get:

m = -(-90 cm)/15 cm = 6

This means that the image is 6 times smaller than the object.

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Stopping distance of the car, as measured from the point where the driver first sees the red light, is 43.95 meters We can use distance-time formula.

To calculate the stopping distance of the car, we need to determine the distance traveled during the driver's reaction time and the distance traveled while the car is decelerating.

During the driver's reaction time, the car will continue to move forward at its initial speed of 15.5 m/s. The distance traveled during this time is:

\(d_reaction = v_initial * t_reaction = 15.5 m/s * 0.321 s = 4.98 m\)

After the driver reacts, the car begins to decelerate at a rate of \(6.2 m/s^2\). Use equation:

d =\(v_initial * t + (1/2) * a * t^2\)

where d: distance traveled, v_initial: initial velocity, t: time, a: acceleration, and final velocity = 0 (since car stops).

We need to find the distance traveled during the deceleration period, so we can rearrange the equation to solve for d:

d = \((v_initial^2) / (2a)\)

Put values:

\(d_deceleration = (15.5 m/s)^2 / (2 * -6.2 m/s^2) = 38.97 m\)

Note that we used a negative value for acceleration, since the car is decelerating (slowing down) rather than accelerating (speeding up).

The total stopping distance is the sum of the distance traveled during the driver's reaction time and the distance traveled while decelerating:

\(d_total = d_reaction + d_deceleration = 4.98 m + 38.97 m = 43.95 m\)

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The conservation laws we can find the complete reaction of Uranium-235 and the correct answer is:

               \(^{235}_{92}U + ^1_0n\)  → \(^{236}_{92} U*\)

               \(^{236}_{92}U*\)  →  \(2 \ ^{116}_{46} \ Pd + 2 \ ^1_0n + 195 \ MeV\)

Nuclear fission occurs when a heavy nucleus is divided into two smaller nuclei, for the process to occur requires the absorption of some particle or some form of energy that creates an unstable heavy nucleus this nucleus passes to a lower energy configuration when be divided.

In the case of Uranium 235 this occurs when a neutron is absorbed, according to the reaction

                    \(^{235}_{92} U + ^1_0n\) →  \(^{236}_{92} U*\)

Where uranium 235 and 236 of atomic mass, * indicates that the nucleus is unstable and decays after about 10⁻¹² s

Indicate that one of the daughter nuclei is palladium, which is why a partial reaction remains

                  ^{236}_{92} U* → \(^{116}_{46}Pd\) + Y + \(^1_0n\)

Where Y is the other daughter nucleus and n the neutrons released in the reaction

The conservation laws must be fulfilled, let's use:  the conservation of atomic number and mass

.

1) The conservation of the atomic number allows to find the number of protons (atomic number) to atoms Y

                #_protons = 92- 46

                #_protons = 46 protons

The other atom is also a Palladium atom, the reaction is

           ^{236}_{92} U* → \(2 \ ^{116}_{46}Pd\)  + \(^1_0n\)

2) Conservation of mass we can find the number of neutrons emitted in the reaction

The mass of the palladium atoms is

                   m_ {children} = 2  116.9178 u

                   m_ {children} = 233.8256 u

The mass difference between the uranium and the daughter nuclei is

                   Δm = m_ u - m_ {daughters}

                   Δm = 236.0455561 - 233.8256

                   Δm = 2.2199561 u

The mass of a neutron tabulated is m_n = 1.000866492 u

Consequently there is only mass for two neutrons that must be emitted in the process, the mass of the two neutrons is

                  m_ {total neutron} = 2.001732984 u

The amount of mass remaining is converted into energy

                   ΔE = m c²

The remaining mass to be convert to energy is

                 m_{remaining} = 2.2199561 - 2.001732984 = 0.2103626 u

                  m = 0.2102626 u (1.66054 10⁻²⁷ kg / 1u) = 0.3491495 10⁻²⁷ kg

                  ΔE = 0.3491495 10⁻²⁷ (2.99 10⁸) ²

                  ΔE = 3.1214 10⁻¹¹ J

It is more common to give this energy in eV

                 ΔE = 3.1214 10⁻¹¹ J ( \(\frac{1 eV}{1.6 \ 10^{-19} J}\) ) = 1.9509 10⁸ eV

We summarize the complete reaction is

               \(^{235}_{92}U + ^1_0n\)  → \(^{236}_{92} U*\)

               \(^{236}_{92}U*\)  →  \(2 \ ^{116}_{46} \ Pd + 2 \ ^1_0n + 195 \ MeV\)

We can see that this reaction is not very efficient since a neutron is needed to start it and only two neutrons are emitted at the end of the process, even when the amount of energy emitted is high 195 MeV

In conclusion Using the conservation laws we can shorten the complete reaction of Uranium giving that the correct answer is:

                  \(^{235}_{92}U + ^1_0n\)  → \(^{236}_{92} U*\)

               \(^{236}_{92}U*\)  →  \(2 \ ^{116}_{46} \ Pd + 2 \ ^1_0n + 195 \ MeV\)

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Answer:

an apple that fell down from a tree

Explanation:

he wondered what force was acting as the apple fell , he later termed it as a downward force acting on the earth called gravity.

Answer:

that's really hard to answer since we are not you know in the furtue but one could

Answer:

They are made of one type of atom.

Explanation:

Answer:

The answer is A

Explanation:

The given statement, "If a body starts with zero velocity and ends with zero velocity, then the area under the positive acceleration curve must be equal to the area under the negative acceleration curve," is True. This is because positive acceleration causes an increase in velocity, while negative acceleration causes a decrease in velocity.

In order for the body to return to zero velocity, the total change in velocity due to positive acceleration must be canceled out by the total change in velocity due to negative acceleration, meaning that the areas under both curves must be equal.

The area under the positive acceleration curve represents the increase in velocity during the displacement, while the area under the negative acceleration curve represents the decrease in velocity during the return to the original position. Since the body ends with zero velocity, the areas under both curves must be equal in magnitude and opposite in sign, resulting in a net area of zero.

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Answer:

She will have kinetic energy at the bottom of the hill=45700 J

Explanation:

We are given that

Mass, m=60 kg

Speed, v=10 m/s

Height, h=150 m

Length of slope, d=650 m

Frictional force, f=70 N

We have to find the kinetic energy she will have at the bottom of the hill.

Kinetic energy  at the bottom of the hill

=Initial kinetic energy+ mgh-fd

Substitute the values

Kinetic energy  at the bottom of the hill

=\(\frac{1}{2}(60)(10)^2+60\times 9.8\times 150-70\times 650\)

=\(45700J\)

Hence, she will have kinetic energy at the bottom of the hill=45700 J

Answer: Density=0.8

Explanation: It's 0.8 because you are supposed to do m/v=d and that would be 40/50=0.8

Answer:

The density is 0.8 g/cc.

Explanation:

40g/50mL=0.8 g/cc.

0.8 g/cc is equal to 0.8 g/mL.

There is no constant speed parameter ß that can satisfy the given conditions. The problem is not solvable as it leads to contradictory equations.

To determine the constant speed parameter ß required for the trip, let's break down the problem step by step.

1. Let's assume the daughter's age is represented by D and the father's age is represented by F.

2. We are given that the father is 22.00 years older than his daughter, so we can write the equation:
  F = D + 22.00

3. The father wants to travel outward from Earth for 3.000 years and then back to Earth for another 3.000 years. This means the total time elapsed for the father's journey is 6.000 years.

4. After the journey, the father wants to be 22.00 years younger than his daughter. So we can write the equation:
  F + 6.000 = D - 22.00

5. Now we have two equations:
  F = D + 22.00
  F + 6.000 = D - 22.00

6. We can solve this system of equations to find the values of F and D. Subtracting the first equation from the second equation gives:
  F + 6.000 - F = D - 22.00 - (D + 22.00)
  6.000 = -44.00

7. This is not a valid equation, which means there is no solution to the problem. The constant speed parameter ß cannot be determined in this case.

In summary, there is no constant speed parameter ß that can satisfy the given conditions. The problem is not solvable as it leads to contradictory equations.

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The object having mass 4kg will have greater potential energy as it has larger mass.

What is potential energy  ?

Potential energy is a form of stored energy that is dependent on the relationship between different system components. A spring's potential energy rises when it is compressed or stretched. If a steel ball is raised above the ground as opposed to falling to the ground, it has more potential energy. It is capable of performing more work when raised. Potential energy is a characteristic of systems rather than of particular bodies or particles; for instance, the system made up of Earth and the elevated ball has more potential energy as they become further apart.

U=m g h

The object having mass 4kg will have greater potential energy as it has larger mass.

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Answer:

The Enlightenment.

Explanation:

The Enlightenment took place during the eighteen century and it typically involved a period of philosophical, cultural and intellectual movement in which ideas on nature, reason, humanity and God were emphasized on greatly over science and superstition through meetings that were held at coffeeshops, scientific academies, literary salons, masonic lodges, etc. Some of the influential philosophers of the enlightenment were Adam Smith, John Locke, Jean Jacques Rousseau, David Hume, Baruch Spinoza, Montesquieu, Hugo Grotius, Denis Diderot, Gottfried Wilhelm, Cesare Beccaria, Immanuel Kant etc. The enlightenment was also known as the age of reason or the age of enlightenment.

Hence, the enlightenment was a period in European history when many educated people stressed the importance of learning and reasoning; education was considered the key to understanding and solving society's problems.

Answer:

4.27m

Explanation:

Recall that for uniform rotational motion,

the formula for centripetal acceleration is given as

Centripetal acceleration = ( velocity)² / radius

in our case we are given :

Centripetal acceleration = 9.0 m/s²

velocity = 6.2 m/s

substituting these into the formula:

9.0 = 6.2² / radius

radius = 6.2² / 9.0 = 4.27m

The complete range of light waves, organized by wavelength and frequency, is known as the electromagnetic spectrum. The electromagnetic spectrum encompasses all forms of electromagnetic radiation, ranging from the longest wavelengths to the shortest.

Starting from the longest wavelengths and lowest frequencies, we have radio waves, which are used for communication and broadcasting. As the wavelengths decrease and frequencies increase, we encounter microwaves, commonly used in cooking and telecommunications.

Continuing, we have visible light, which is the narrow range of wavelengths that can be detected by the human eye. It includes the colors of the rainbow from red (longest wavelength) to violet (shortest wavelength).

Beyond visible light, we encounter ultraviolet waves, X-rays, and gamma rays. Ultraviolet waves are responsible for sunburn and have applications in sterilization and fluorescent lighting.

X-rays are used in medical imaging, and gamma rays have the shortest wavelengths and highest frequencies, being emitted during nuclear reactions.

In summary, the electromagnetic spectrum consists of radio waves, microwaves, infrared waves, visible light, ultraviolet waves, X-rays, and gamma rays, organized in order of increasing frequency and decreasing wavelength.

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1) Frequency

2) I dont know this one sorry

Density is a measure of how much mass is contained within a given volume.  An object with a density of 1000 kg/m³ is denser than an object with a density of 1 g/cm³.

Density is a measure of how much mass is contained within a given volume. The formula for density is mass divided by volume (ρ = m/V). In the metric system, density is commonly expressed in kilograms per cubic meter (kg/m³) or grams per cubic centimeter (g/cm³).

Comparing the given densities, we can see that 1 g/cm³ is equivalent to 1000 kg/m³ since there are 1000 grams in a kilogram and 1 cubic meter is equal to 1,000,000 cubic centimeters. Therefore, the object with a density of 1000 kg/m³ has a higher mass per unit volume compared to the object with a density of 1 g/cm³.

This means that for the same volume, the object with a density of 1000 kg/m³ contains more mass, making it denser than the object with a density of 1 g/cm³. In simpler terms, if you were to compare objects of the same size, the object with the higher density would feel heavier because it has more mass packed into the same amount of space.

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Explanation:

\( \lambda = 8 \: m \\ T = 2 \: s \\ but \: f = \frac{1}{T} \\ f = \frac{1}{2} = 0.5 \: Hz \\ from \: wave \: equation \\ V = f \lambda \\ V = 8 \times 0.5 \\ V = 4 \: m {s}^{ - 1} \)

(1) The ball is in the air for 1.4 seconds.

(2) The horizontal velocity of the ball as it rolls off the table is 6.32 m/s.

(3) The vertical velocity of the ball right before it hits the ground is 13.72 m/s.

(4) The horizontal velocity of the ball right before it hits the ground is 6.32 m/s.

(5) The initial vertical velocity as soon as the ball comes of the cliff is 13.72 m/s​.

The time of motion of the ball is calculated by applying the following equation.

t = √(2h/g)

where;

t =  √(2h/g)

t = √(2 x 9.63 / 9.8)

t = 1.4 seconds

The horizontal velocity of the ball is calculated as follows;

v = d/t

where;

v = 8.85 m / 1.4 s

v = 6.32 m/s

The vertical velocity of the ball before it hits the ground is calculated as;

vf = vi + gt

vf = 0 + 9.8 x 1.4

vf = 13.72 m/s

The horizontal velocity of the ball right before it hits the ground is calculated as;

the initial velocity of a projectile = final horizontal velocity

vxf = vxi = 6.32 m/s

The initial vertical velocity as soon as the ball comes off the cliff = final vertical velocity = 13.72 m/s

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speed is 275 feet per second 275×60 = 16500 ft. 16500×Sin15° = 4270.51 ft (app.)

answer is 4270.51

How do you determine an airplane's speed?

the Mach Number.

Formula:

Mach Number = Sound Speed / Aircraft Speed (dependent on altitude)

Example:

The speed of sound at 30,000 feet is equal to 589.4 knots as the aircraft flies. There are 489.3 knots of airspeed.

Calculate: 0.83 Mach = 489.3/589.5.

How is the distance climbed determined?

We can determine the horizontal distance we will cover throughout the ascent given that we know how long it will take:

Ground speed multiplied by climbing time equals horizontal distance.

Using the previous formulas:

rise in altitude = 4000 - 1000 = 3000 ft.

3000 divided by 600 equals 5 minutes for the ascent.

10 NM is the horizontal distance at 120 * 5/60.

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Answer:

All soft drinks contain water. When soft drink bottles are chilled in sub-zero temperatures, the water on account of its anomalous expansion expands. Thus, to provide space for expanding water, soft drink bottles are not completely filled as otherwise they will burst.

Explanation:

Answer:

Soft drink bottles are filled leaving some space between the lid/cap and the liquid level.

Explanation:

The reason is that the soft drinks are cooled below room temperature.  Sometimes they are kept in the hot Sun and weather.  They are subject to a big temperature variation.  Also, there are gases like CO2 mixed in the drink.  So the gases come out of the liquid and expand due to heat.  That creates high pressure.

Water expands when it is cooled to 4 deg. C.  But the bottle (glass) contracts when it is cooled.  So if there is no air gap,  then volume of water (cool drink) will become more than the inside volume of the bottle.  Then the bottle will break due to pressure from water expansion around 8 deg. to 4 deg.C.

When a bottle is opened, due to pressure difference, and temperature difference, the gases come out of drink in the form of bubbles.  So cold drink overflows out.

Also, the soft drink bottles are capped tightly.  When an opener is used to open it using some force upwards, the pulling force also moves the soft drink bottle upwards.  So just after the lid comes off, the top part of the drink comes out due to the pull.  So some drink spills on people who open or, it falls outside.

In order to prevent these problems, some gap is left open between the surface of the soft drink and the top of the bottle.

I = 4.5 A

Explanation:

P = VI ---> I = P/V

I = (495 W)/(110 V)

= 4.5 A

Answer:

it is to tell the amount of time that has elapsed between activation and deactivation

Explanation:

Answer:  20 m/s

Explanation:

P = mv

since we're trying to find the velocity, you change the formula to v = P/m

v = ?

P = 9 kgm/s

m = 0.45 kg

v = 9 kgm/s / 0.45kg  = 20 m/s