100 points
National Park rangers create public announcements to help prevent accidental wildfires from start. Which is a simple way that accidental wildfires can be prevented in these parks?(1 point)

Ensure people do not have unattended cooking fires while camping.

Ensure people do not create defensible spaces.

Prevent people from thinning dead trees.

Prevent rangers from setting controlled burns.

The wavelength of nanometers of ultraviolet radiation has an energy of 410 kj/mol is 292 nm.

The energy content of ultraviolet light with a wavelength of 300 nm is approximately 95.3 kcal, Einstein, which is sufficient to spontaneously break carbon-carbon bonds. Wavelength can be calculated using the formula Wavelength  Wave Speed, Frequency. Wavelength is usually expressed in meters. The symbol for wavelength is the Greek lambda.

As every engineer knows, calculating energy is easy. The unit of electrical energy is the kilowatt hour kWh. It is determined by multiplying the amount of electricity consumed kilowatts, kW by the number of hours the electricity was consumed. Multiply this by the cost per kWh to get the total energy cost. For methane, you can calculate the energy required to split 1 mole of methane gas into gaseous carbon and hydrogen atoms.

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The physicist traveling, according to his own testimony at -6.6 × 10⁷ m/s.

Using the formula for doppler shift for light,

λ' = λ√[(1 + v/c)/(1 - v/c)] where

Given that the driver is moving away from the stop light, we take the driver as the source. Since, the Doppler shift made the red light of wavelength 650nm appear green to him, with a wavelength of 520nm. we have

So, substituting the values of the variables into the equation, we have

λ' = λ√[(1 + v/c)/(1 - v/c)]

520 nm = 650 nm√[(1 + v/c)/(1 - v/c)]

520/650 = √[(1 + v/c)/(1 - v/c)]

0.8 = √[(1 + v/c)/(1 - v/c)]

Squaring both sides, we have

0.8² = (1 + v/c)/(1 - v/c)

0.64 = (1 + v/c)/(1 - v/c)

0.64(1 - v/c) = (1 + v/c)

0.64 - 0.64v/c = 1 + v/c

0.64 - 1 = v/c + 0.64v/c

-0.36 = 1.64v/c

-0.2195 = v/c

v = -0.22c

v = -0.22 × 3 × 10⁸ m/s

v = -0.66 × 10⁸ m/s

v = -6.6 × 10⁷ m/s

So, the physicist traveling, according to his own testimony at -6.6 × 10⁷ m/s.

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Taking into account the definition of speed ans velocity, the speed and velocity of the car are 10 km/h and 10 km/h due east respectively and the speed and velocity of the truck are 20 km/h and 20 km/h due west respectively.

Speed ​​is a physical quantity that expresses the relationship between the space traveled by an object and the time used for it. That is, the speed is associated with the change of position of an object in space within a certain amount of time.

The speed can be calculated using the expression:

speed= distance traveled÷ time

Velocity is a physical magnitude that relates the displacement of an object, the time it takes to make this change in position and direction. So it is considered a vector magnitude.

The velocity can be calculated using the expression:

velocity= distance traveled÷ time

Velocity has units of distance/time and includes direction of travel.

In this case, you know:

The speed and velocity of the car can be calculated:

The speed and velocity of the truck is calculated as:

In summary, the speed and velocity of the car are 10 km/h and 10 km/h due east respectively and the speed and velocity of the truck are 20 km/h and 20 km/h due west respectively.

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Ranking of de Broglie wavelengths from largest to smallest is electron > proton > helium

De Broglie's relationship is given by [tex]\lambda=\frac{h}{mv}[/tex]      .....(1) , where λ  is known as de Broglie wavelength and m is mass , v is velocity , h = Plank’s constant.

From equation (1) wavelength and mass has an inverse relation .

Mass of helium is 4 times the mass of the proton and proton has a greater mass than electron.

According to equation (1) , less the mass higher will be the wavelength

Hence electron having less mass have higher wavelength and then proton and then helium having large mass will have less wavelength .

Thus, order should be electron > proton > helium .

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The time taken for the airplane to travel 1350 m from rest is 30 s

The following data were obtained from the question:

The time taken to travel the distance of 1350 m can be obtained as follow:

s = ut + ½at²

1350 = (0 × t) + (½ × 3 × t²)

1350 = 0 + 1.5t²

1350 = 1.5t²

Divide both sides by 1.5

t² = 1350 / 1.5

t² = 900

Take the square root of both sides

t = √900

t = 30 s

Thus, it will take 30 s for the plane to travel a distance of 1350 m

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A plausible hypothesis in this case is; "different masses of objects fall to the ground at different rates".

A hypothesis is a plausible explanation for an observation. A hypothesis is always formulated prior to an experiment. The experiment would now confirm or disprove the hypothesis that has been put forward.

Recall that an experiment must have a dependent variable and an independent variable. The independent variable is the variable that we have to continue to manipulate while the dependent variable is the variable that dependent variable changes with the independent variable.

A plausible hypothesis in this case is; "different masses of objects fall to the ground at different rates". The independent variable would now be mass of the object while the dependent variable would be the rate at which the object falls.

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Answer:

The two scales have different zero points and the Celsius degree is bigger than the Fahrenheit. However, there is one point on the Fahrenheit and Celsius scales where the temperatures in degrees are equal. This is -40 °C and -40 °F.

Explanation:

Answer: The total angular momentum of the person-merry go round system is constant

Explanation:

A team of researchers discovers a new gas, which has a value of 1.75 which is impossible. Because the value of the heat capacity is 1.66.

The heat capacity ratio sometimes referred to as the adiabatic index, the ratio of specific heat, or Laplace's coefficient in heat engineering and thermodynamic parameters, is the fraction of the heat capacity at constant pressure [tex]( \rm C_P)[/tex] to the heat capacity at constant volume [tex](\rm C_V)[/tex].

For the mono-atomic gases, the heat capacity ratio is maximum, then it decreases with bi-atomic gases, and it further decreases for tri-atomic gases.

A group of scientists finds a new gas with a heat capacity of 1.75 which is impossible. Due to the maximum heat capacity value is 1.66.

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The forces during rocket launching are unbalanced as, without unbalanced force, there can not be any motion.

Forces constantly balance and become out of balance during a rocket flight. On the launch pad, a rocket is balanced. Gravity tries to pull the rocket down, but the surface of the pad pushes it upward.

When the rocket's engines are lit, the thrust from them causes the forces to become out of balance, which causes the rocket to ascend. For a rocket to launch from a launch pad or for a spacecraft to change speed or direction, an unbalanced force must be applied.

Therefore, when the rocket is in the process of launching, the forces that act on the rocket are unbalanced.

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The car moves 50 km while accelerating.

In mechanics, speed increase is the pace of progress of the speed of an article regarding time. Speed increases are vector amounts. The direction of an item's speed increase is given by the direction of the net power following up on that article. For instance, when a vehicle begins from a halt (zero speed, in an inertial casing of reference) and goes in an orderly fashion at speeding up, it is advancing toward movement. In the event that the vehicle turns, a speed increase happens toward the new bearing and changes its movement vector. The speed increase of the vehicle in its momentum bearing of movement is known as a straight (or distracting during roundabout movements) speed increase, the response to which the travelers on board insight as a drive pushing them once again into their seats. While taking a different path, the affecting speed increases.

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A polygon with only one set of parallel sides is called a trapezoid. The parallel bases of a trapezoid are another name for these parallel sides. Trapezoids have two additional sides that are not parallel and are referred to as their legs. The value of x is 12.

A four-sided shape called a trapezoid has one pair of parallel sides. It fundamentally resembles a square, rectangle, or parallelogram in two dimensions. So, like other shapes, this one has a boundary and an area.

There are some Mid-segment characteristics :

Now, according to the diagram, make an equation :

5x-20 = [(2x+6) + (4x+2)] / 2

5x-20 = (6x+8)/2

5x-20 = 3x+4

5x-3x = 20+4

2x = 24

x = 12

Hence, the value of x is 12.

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The acceleration of the Jetliner during takeoff = 2.1 [tex]m/s^2[/tex]

The given dataset of time in seconds and takeoff speed in m/s is:

t (s)       v(m/s)

0                0

10             21

20            42

30             63

As we can see the rate of change of velocity (Δv) is uniform in each interval.

That is, in each interval, Δv = 21 m/s and Δt = 10s

We need to find the jetliner's acceleration during the takeoff.

Acceleration of a moving body is defined as the rate of change of velocity. Here since the rate of change of velocity is constant, we can simply use the following formula to find the acceleration.

Acceleration during takeoff, a = Δv / Δt = 21/10 = 2.1 [tex]m/s^2[/tex]

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The takeoff speed for an airbus a320 jetliner is 78 m/s . velocity data measured during takeoff are as follows:

t (s)       v(m/s)

0                0

10             21

20            42

30             63

What is the jetliner's acceleration during takeoff, in m/s2?

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The total leaf area is increased by a factor of 1.

The total area of the leafy plant is given by the formula below:

a = k m/34

where m is the mass of the tree

The mass of the two smaller trees are half the masses of the bigger trees.

The total area of each of the smaller leafy plants are given are given as follows:

a ∝ m/2 * 3/4

a ∝ m3/8

a = k * m * 3/8

The total area of the two trees:  k * m * 3/8 +  k * m * 3/8

a = 2 *  k * m * 3/8

a =  k * m * 3/8

Therefore, the area is increased by a factor of 1.

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If the atomic orbitals are oppositely charged then they interact destructively.

In Chemistry, molecular orbital theory refers to the pattern of electron movement in a molecule.

It states that electrons have wave-like nature and their combination is the result of the atomic wavefunction.

According to this theory, there are two types of orbitals: bonding orbitals (BO) and anti-bonding orbitals(ABO).

Electrons in bonding orbitals make the molecule more stable as compared to electrons of anti-bonding orbitals.

Atomic orbitals form molecular orbitals and the combination of waves in molecule orbitals forms constructive and destructive interference. In-phase waves give rise to constructive interference.

While the combination of out-of-phase waves results in destructive interference that results in a straight line with no amplitude.

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Answer: 558 meters in 31 seconds.

Explanation:

You simply do 18*31 because every single second for thirty one seconds, the girl is going 18 meters.

Therefore, at this rate, she would ride about 558 meters in 31 seconds.

Answer:

558 m

Explanation:

The formula for distance, given speed and time, is D=ST. When you plug the numbers into this, D=(18)(31), and 18 times 31  *puts in calculator*  is 558.

The speed is in meters per second, so meters would be your unit.

So, the answer is 558 m.

Hope I helped!!! :)

When a moving body's direction changes, its velocity doesn't always go to zero. Only when the body's total displacement is zero does velocity become zero.

A change in the body's state of motion is reflected in either a change in the body's speed or its direction of motion. A force is an attempt to alter the status of an object, whether it is stationary or moving. The speed shift might indicate acceleration or slowdown (deceleration). Acceleration measures the change in speed as opposed to velocity, which measures speed in a vector (also in a vector). The velocity is zero, which indicates that although the item is not moving, there is a force exerted on it due to acceleration.

Hence the change in motion is zero

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If an electron is released from infinity, after falling to within 1x10-10 m of a proton its speed will be 2.25x10^-6 m/s.

Speed is typically characterized as rapidity in motion, travel, or action; swiftness; and celerity. The speed of light and the speed of sound are two instances of speed. Speed of motion or forward movement; relative quickness in moving, progressing, etc.: we're moving really quickly. the fullest, highest, or most efficient pace of motion: The car just needs nine seconds to accelerate to its top speed. According to special relativity, the maximum speed at which energy or information may move is equal to the speed of light in a vacuum, which is equal to c = 299792458 meters per second (about 1079000000 kilometers per hour or 671000000 mph).

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The slope of a line is also referred to as the gradient and it is the number which describes both the direction and the steepness of the line.

This type of formula is used to calculate how steep a line is and is usually denoted as m. The formula can be seen below:

m = y2-y1 / x2-x1

Slope can be defined as the ratio of the vertical change between two points to the horizontal change between two points and measures the steepness of a line.

The chosen answers provided are therefore the most appropriate in this context.

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The radius of magnesium atom is 0.16NM and radius of nucleus is 1\10,000 of atom so radius of magnesium nucleus will be 1.6E-5 NM.

Given,

radius of magnesium atom is 0.16NM

radius of nucleus is about 1\10,000 of an atom

So radius of magnesium nucleus will be :

radius of magnesium atom *  1\10,000

0.16 NM *1\10,000
1.6e-5 NM

Hence radius of magnesium nucleus will be  1.6E-5 NM by simple unitary method.

We can also put it in SI units by using the same unitary method and get the values in meters which will be equal in values to 1.6 e-14 m.

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The telescope created the data gathered by Kepler and his team.

What is a star?

A star is a large luminous astronomical body which produces light and heat energy as well as radiation.

There are billions of stars in the universe organized into galaxies.

The Sun is the star of our solar system.

The Kepler project produced a wide range of data products and documentation to assist the community in using data from the mission to help study both exoplanets and other astrophysical areas.

In the video, a mysterious star was observed which is 50 percent bigger and 1,000 degrees hotter than the Sun.

By mean of telescopes, it was observed that the dimming seen in the diet was dues to dust particles.

These data produced ranges from engineering data on the detectors to lists of planet candidates and includes many of the intermediate data products in the data processing path.

The Kepler first mission came to an end after four years when two of the four reaction wheels, used to point the spacecraft malfunctioned.

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Because most particles fired at metal foil passed straight through, Rutherford concluded that only a small area of an atom is positively charged called the nucleus.

According to Rutherford's atomic model, the atom is a tiny particle that is made up of fundamental objects called electrons, protons, and neutrons.

In the center of an atom, there is a dense, micro-sized, and positively charged nucleus.

All the mass of an atom resides in the nucleus around which small and negatively charged particles revolve in orbitals called electrons.

However, this model suggests that when electrons were bombarded on gold metal foil, most of them went straight and only a few changed their path after colliding with the positively charged nucleus.

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Answer: 420 N

Explanation:

coefficient of static friction * normal force=maximum static friction force

0.6 * 700N=maximum static friction force

6/10 * 700N=

700*6/10=

4200/10=420 N

The current in the solenoid is [tex]3.18\times10^{-11}A[/tex].

It is given that  30.0 -turn solenoid of length 6.00 cm = 0.06m produces a magnetic field of magnitude 2.00 mT at its center .

Putting above values in equation (1) , we get

[tex]2.00=\frac{4\pi \times10^{-7}\times30.0I}{0.06} \\\\I=\frac{2.00\times0.06}{4\pi \times10^{-7}\times30.0} \\\\I=3.18\times10^{-11}A[/tex]

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Answer: Students who eat breakfast will perform better on a math exam than students who do not eat breakfast.

Explanation:

Hope this helps!

27.00 kg of liquid mercury is needed to fill a 2.0 L container.

The required mass of mercury in kg to fill a 2.0 L container can be determined through proper conversion of units.

Conversion of cm3 to L:

1 cm3 = 1 mL and 1000 mL = 1L

1000 cm3 = 1 L

Conversion of g to kg:

1000 g  = 1 kg

Determine the product of density and volume of the container to solve for the required mass of mercury.

(13.5 g/cm3) x ( 1000 cm3/1 L) x (2.0 L) = 27,000 g

27,000 g * (1 kg/1000 g) = 27 kg of mercury

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The frequency of the scattered photon will be lower which is option (a).

According to the quantum concept of radiation,  radiation consists of packets of energy  called photons. The photon energy is given by

 [tex]E=hv=\frac{hc}{\lambda}[/tex]   ....(1)

where 'h' is the Planck's constant

 [tex]v=\frac{c}{\lambda}[/tex]    ...(2)

where 'v'  is the radiation frequency

As x-ray photon is scattered by an electron , there will be loss in the energy of scattered photon.

From equation (1) energy and wavelength have inverse relation which means that due to loss in the energy of scattered photon there will be an increase in the wavelength of scattered photon.

From equation (2) frequency and wavelength have inverse relation due to which increment in the wavelength of scattered photon will lower the frequency of the scattered photon.

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The time it takes Jane to catch up with Don if Jane is traveling at 10 k.p.h and don at 6 k.p.h is: 2.5 h

The formula and procedure we will use to solve this problem is:

Tr = x/(v2-v1)

Where:

Information about the problem:

Applying the reach time formula we get:

Tr = x/(v2-v1)

Tr = 10 km/(10 km/h- 6 km/h)

Tr = 10 km/(4 km/h)

Tr = 2.5 h

It is a physical quantity that indicates the displacement of a mobile per unit of time, it is expressed in units of distance per time, for example (miles/h, km/h).

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The proper equation to use for finding the net force in the y direction is B. Fnety = (FT)(sin 32°) – Fg

The total force acting on an object is its net force. The net force can be determined using Newton's second law, which states that F = ma, where: F is the net force. The object's mass is given by m. Acceleration is a.

The total of all forces acting on an object is known as the net force. A mass can accelerate due to net force. A body is subject to another force whether it is at rest or in motion. The net force is a word used in a system where there is a substantial number of forces.

In this case, the proper equation to use for finding the net force in the y direction is B. Fnety = (FT)(sin 32°) – Fg.

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Answer:

B. Fnety = (FT)(sin 32°) – Fg

Explanation:

just did it!