Physics High School

In Linnean taxonomy, the most unique level is _____.

species
genus
kingdom
breed

Answers

Answer 1
The answer is species, I hope this helps!
Answer 2
the correct answer is A I'm doing the quiz too

Related Questions

Determine the pressure exerted by 2.50 mol of gas in a 2.92 l container at 32 oc.

Answers

I guess you meant "at [tex]32^{\circ}C[/tex]"

Solution:
we can solve the problem by using the ideal gas law, which states:
[tex]pV=nRT[/tex]
where
p is the gas pressure
V its volume
n the number of moles
R the gas constant
T the absolute temperature

Before using this equation, we have to convert the temperature in Kelvin:
[tex]T=32^{\circ}C+273 = 305 K[/tex]
and the volume in [tex]m^3[/tex]:
[tex]V=2.92 L= 2.92 dm^3 = 2.92 \cdot 10^{-3} m^3[/tex]

So now we can re-arrange the ideal gas equation to find the pressure exerted by the gas, p:
[tex]p= \frac{nRT}{V}= \frac{(2.50 mol)(8.31 J/mol K)(305 K)}{2.92 \cdot 10^{-3} m^3}= 2.17 \cdot 10^7 Pa[/tex]

If an astronaut throws an object in space, the object’s speed will _____

Answers

the object's speed will not change.

In fact, after the astronaut throws the object, no additional forces will act on it (since the object is in free space). According to Newton's second law:
[tex]\sum F=ma[/tex]
where the first term is the resultant of the forces acting on the body, m is the mass of the object and a its acceleration, we see that if no forces act on the object, then the acceleration is zero. Therefore, the acceleration of the object is zero, and its velocity remains constant.


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Scientist tested the effect of a fertilizer on the growth of plants. They had two sets of plants Group A which gets fertilizer water & and Group B which gets only water and sun (but equal amounts to Group A)

1. Explain how this scenario is a controlled experiment and identify the manipulated variable?

2. If the scientist only performed one experiment but it supported their hypothesis why can it not be considered a theory?

Answers

ANSWER 1: The manipulated variable is the fertilizer since the other factors (water and sunlight) are given in equal amounts. It is a controlled experiment because one group receives fertilizer while the other does not. Any differences in growth should be due to either having fertilizer or not.

ANSWER 2: In order for it to be a theory, it has to be tested numerous times by multiple scientists.

Hope it helps. God bless
2_ it doesn't because scientist have to do multiple tests and they have to get the same results

1_i don't know for sure

you stretch a spring by a distance of 0.3 m. the spring has a spring constant of 440 n/m. when you release the spring, it snaps back. what is the kinetic energy of the springs as it reaches its natural length?

Answers

Answer:

19.8 J

Explanation:

According to the law of conservation of energy, the total mechanical energy of the spring (sum of kinetic energy and elastic potential energy) must be conserved:

[tex]K_i + U_i = K_f + U_f[/tex] (1)

where we have

[tex]K_i[/tex] is the initial kinetic energy of the spring, which is zero because the spring starts from rest (2)

[tex]U_i[/tex] is the elastic potential energy of the spring when it is fully stretched

[tex]K_f[/tex] is the kinetic energy of the spring when it reaches the natural length

[tex]U_f[/tex] is the elastic potential energy of the spring when it reaches its natural length, which is zero because the stretch in this case is zero (3)

So

[tex]U_i = \frac{1}{2}k(\Delta x_i)^2[/tex]

where

k = 440 N/m is the spring constant

[tex]\Delta x_i = 0.3 m[/tex] is the initial stretching of the spring

Substituting,

[tex]U_i = \frac{1}{2}(440)(0.3)^2=19.8 J[/tex]

And so using eq.(1) and keeping in mind (2) and (3) we find

[tex]K_f= U_i = 19.8 J[/tex]

Zero on the celsius scale is also known as absolute zero true or false

Answers

False.
0°C = 273.15°K
Final answer:

Zero on the Celsius scale is not known as absolute zero. - False

Explanation:

Zero on the Celsius scale is not known as absolute zero. Absolute zero is the lowest temperature that can theoretically exist, and it is equal to -273.15 degrees Celsius or -459.67 degrees Fahrenheit. Zero degrees Celsius is simply the freezing point of water. At this point, all molecular motion and energy cease, and no heat remains in matter.

It is a fundamental concept in thermodynamics and the basis for the Kelvin temperature scale. Achieving absolute zero is impossible in practice, but scientists have come close, allowing the study of quantum phenomena and materials at extremely low temperatures, leading to breakthroughs in physics and technology.

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When ultraviolet light with a wavelength of 400 nm falls on a certain metal surface, the maximum kinetic energy of the emitted photoelectrons is measured to be 1.10 eV .
What is the maximum kinetic energy of the photoelectrons when light of wavelength 285 nm falls on the same surface?

Answers

In the photoelectric effect, the energy of the incoming photon is used partially to extract the photoelectron from the metal (work function) and the rest is converted into kinetic energy of the photoelectrons:
[tex]hf=\phi + K_{max}[/tex] (1)
where
h is the Planck constant
f is the photon frequency
[tex]\phi[/tex] is the work function
[tex]K_{max}[/tex] is the maximum kinetic energy of the photoelectrons

In the first part of the problem, we have light with wavelength [tex]\lambda=400 nm=400 \cdot 10^{-9} m[/tex], so the photons have frequency 
[tex]f= \frac{c}{\lambda}= \frac{3 \cdot 10^8 m/s}{400 \cdot 10^{-9} m}=7.5 \cdot 10^{14}Hz [/tex]
where c is the speed of light; and therefore the energy of the photons is
[tex]E=hf=(6.6 \cdot 10^{-34}Js)(7.5 \cdot 10^{14} Hz)=5.0 \cdot 10^{-19} J[/tex]
Converted into electronvolts ([tex]1 eV= 1.6 \cdot 10^{-19} J[/tex]):
[tex]E=5.0 \cdot 10^{-19} J =3.12 eV[/tex]

The maximum kinetic energy of the photoelectrons in this case is 
[tex]K_{max}=1.10 eV[/tex], so we can find the work function of the metal by re-arranging eq. (1):
[tex]\phi = hf-K_{max} = 3.12 eV-1.10 eV=2.02 eV[/tex]


In the second part of the problem, we have light with wavelength [tex]\lambda=285 nm=285 \cdot 10^{-9}m[/tex], which corresponds to a frequency of
[tex]f= \frac{c}{\lambda}= \frac{3 \cdot 10^8 m/s}{285 \cdot 10^{-9}m}=1.05 \cdot 10^{15} Hz [/tex]
And so the photons have energy
[tex]E=hf=(6.6 \cdot 10^{-34} Js)(1.05 \cdot 10^{15}Hz)=6.93 \cdot 10^{-19} J[/tex]
which corresponds to 
[tex]E=6.93 \cdot 10^{-19}J = 4.33 eV[/tex]

And if we use again eq.(1), we can now find the new maximum kinetic energy of the photoelectrons:
[tex]K_{max}=hf-\phi=4.33 eV-2.02 eV=2.31 eV[/tex]

Which of the following best describes alternating current? current that increases and decreases in temperature current that constantly turns on and off current in which charges change direction current that gains and loses electrons

Answers

Answer: Charge that jiggles  back and forth very quickly.

Explanation: Alternating current is an electric current that peroidically reverses direction  .

A P E X

The following best describes alternating current, Charge that jiggles  back and forth very quickly.

What increases or decreases alternating current?

A transformer is a machine that either boosts or reduce the voltage of alternating current.

Step-up transformer rises the voltage of alternating current whereas step-down transformer reduces the voltage of alternating current.

Thus, Alternating current is an electric current that peroidically reverses direction.

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The ideal mechanical advantage of a machine is 3.2 and its output distance is 2.5 meters. What is the input distance?

Answers

30 because you have 3.2 outputs don't mean others don't

To be topologically equivalent which deformation is not allowed

Answers

I just took this quiz and the answer is tearing. If you want to be topologically equivalent, tearing is not allowed. Hope this helps someone!

What causes the northern and southern halves of the planet to experience winter and summer at opposite times?

Answers

The angle of the Earth on its axis making the sun to beam on the Northern and Southern Hemispheres differently. When one side is fronting the sun, the other is on the side the darkness, so, when it's Winter in the northern half, it's Summer in the southern half. 

Jody has a mass of 50 kilograms what is his weight on earth

Answers

Final answer:

Jody's weight on Earth is calculated by multiplying his mass (50 kg) by Earth's standard gravity (9.81 m/s^2), which equals 490.5 newtons.

Explanation:

When calculating the weight of an object on Earth, we need to account for the force of gravity acting upon the object's mass. The standard acceleration due to gravity on Earth is approximately 9.81 meters per second squared (m/s2). To find Jody's weight, we multiply his mass by the acceleration due to gravity:

Weight = Mass times Earth's gravity

Weight = 50 kg times 9.81 m/s2

Weight = 490.5 N (newtons)

Therefore, on Earth, Jody weighs 490.5 newtons.

Two people push on the same door from opposite sides as shown they will only see the door move when

Answers

one of them overpowers the other

Answer: C.

Explanation: The only way that they will be able to see the door move is if only ONE of them exert more force than the other.

You can see that when they both exert the same force on the door, the forces are balanced, and cancel eachother out.

Hope this helped.

Have a nice day. :)

If a 100N weight sits in an express elevator what will be the weight when the elevator is traveling at a constant speed

Answers

This is a "trick" question.

If the elevator is traveling at constant speed, it means it is at rest. This means anything inside the elevator traveling at constant speed, weights the same as in an elevator not moving -also at rest-.

So the 100N weight's weight doesn't change in an elevator traveling at constant speed.
Final answer:

The weight of the 100N weight will remain the same when the elevator is travelling at a constant speed.

Explanation:

When the elevator is travelling at a constant speed, the weight of the 100N weight will remain the same. The weight of an object is the force exerted on it due to gravity, and this force does not change regardless of the elevator's speed or direction. So, the weight of the object will still be 100N.

A patient needs surgery to open a clogged heart artery. This patient should look for a surgeon who is an expert in which of the following?

Answers

Following for what? What is the following?

The answer is B i know this because

superficial anatomy of the circulatory system

functional anatomy of the circulatory system

superficial anatomy of the nervous system

functional anatomy of the nervous system

its not a nervous system part so there goes the last two and superfical means from the outside of the body like skin and hair and the reproductive like testicals and and the ovarys stuff like that thus leaves your answer with the only logical one {functional anatomy of the circularory system}.

A 0.500-kg glider, attached to the end of an ideal spring with force constant undergoes shm with an amplitude of 0.040 m. compute (a) the maximum speed of the glider; (b) the speed of the glider when it is at (c) the magnitude of the maximum acceleration of the glider; (d) the acceleration of the glider at (e) the

Answers

There is a missing data in the text of the problem (found on internet):
"with force constant k=450N/m"

a) the maximum speed of the glider

The total mechanical energy of the mass-spring system is constant, and it is given by the sum of the potential and kinetic energy:
[tex]E=U+K= \frac{1}{2}kx^2 + \frac{1}{2} mv^2[/tex]
where
k is the spring constant
x is the displacement of the glider with respect to the spring equilibrium position
m is the glider mass
v is the speed of the glider at position x

When the glider crosses the equilibrium position, x=0 and the potential energy is zero, so the mechanical energy is just kinetic energy and the speed of the glider is maximum:
[tex]E=K_{max} = \frac{1}{2}mv_{max}^2 [/tex]
Vice-versa, when the glider is at maximum displacement (x=A, where A is the amplitude of the motion), its speed is zero (v=0), therefore the kinetic energy is zero and the mechanical energy is just potential energy:
[tex]E=U_{max}= \frac{1}{2}k A^2 [/tex]

Since the mechanical energy must be conserved, we can write
[tex] \frac{1}{2}mv_{max}^2 = \frac{1}{2}kA^2 [/tex]
from which we find the maximum speed
[tex]v_{max}= \sqrt{ \frac{kA^2}{m} }= \sqrt{ \frac{(450 N/m)(0.040 m)^2}{0.500 kg} }= 1.2 m/s[/tex]

b)  the speed of the glider when it is at x= -0.015m

We can still use the conservation of energy to solve this part. 
The total mechanical energy is:
[tex]E=K_{max}= \frac{1}{2}mv_{max}^2= 0.36 J[/tex]

At x=-0.015 m, there are both potential and kinetic energy. The potential energy is
[tex]U= \frac{1}{2}kx^2 = \frac{1}{2}(450 N/m)(-0.015 m)^2=0.05 J [/tex]
And since 
[tex]E=U+K[/tex]
we find the kinetic energy when the glider is at this position:
[tex]K=E-U=0.36 J - 0.05 J = 0.31 J[/tex]
And then we can find the corresponding velocity:
[tex]K= \frac{1}{2}mv^2 [/tex]
[tex]v= \sqrt{ \frac{2K}{m} }= \sqrt{ \frac{2 \cdot 0.31 J}{0.500 kg} }=1.11 m/s [/tex]

c) the magnitude of the maximum acceleration of the glider;

For a simple harmonic motion, the magnitude of the maximum acceleration is given by
[tex]a_{max} = \omega^2 A[/tex]
where [tex]\omega= \sqrt{ \frac{k}{m} } [/tex] is the angular frequency, and A is the amplitude.
The angular frequency is:
[tex]\omega = \sqrt{ \frac{450 N/m}{0.500 kg} }=30 rad/s [/tex]
and so the maximum acceleration is
[tex]a_{max} = \omega^2 A = (30 rad/s)^2 (0.040 m) =36 m/s^2[/tex]

d) the acceleration of the glider at x= -0.015m

For a simple harmonic motion, the acceleration is given by
[tex]a(t)=\omega^2 x(t)[/tex]
where x(t) is the position of the mass-spring system. If we substitute x(t)=-0.015 m, we find 
[tex]a=(30 rad/s)^2 (-0.015 m)=-13.5 m/s^2[/tex]

e) the total mechanical energy of the glider at any point in its motion. 

we have already calculated it at point b), and it is given by
[tex]E=K_{max}= \frac{1}{2}mv_{max}^2= 0.36 J[/tex]
Final answer:

To compute the maximum speed, use the equation vmax = Aω. At x = 0, the speed is 0. The maximum acceleration is given by amax = Aω².

Explanation:

To compute the maximum speed of the glider, we can use the equation vmax = Aω, where A is the amplitude (0.040 m) and ω is the angular frequency. The angular frequency is given by ω = √(k/m), where k is the force constant (N/m) and m is the mass (kg). In this case, k = 80 N/m and m = 0.500 kg.

For part (b), the speed of the glider when it is at x = 0 (the equilibrium position) is 0. This is because the velocity is at a maximum when the glider passes through the equilibrium position, and at that point, it changes direction.

The maximum acceleration of the glider can be found using the equation amax = Aω². The magnitude of the maximum acceleration occurs at the position x = -A, so we can substitute -A for x in the equation. Finally, the acceleration of the glider at x = -A can be found by substituting this value into the equation a = -Aω².

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Which type of mirror causes light rays to refract away from each other?

Answers

Mirrors don't cause refraction.

A convex mirror could cause parallel rays to REFLECT away from each other.

Red cabbage juice can be used as an acid-base indicator. When a solution is highly acidic, the juice turns red. As the acidity decreases and the solution becomes basic, the color changes from red to violet to green to yellow. Red cabbage juice is used as an indicator of some common household products. Which product will turn yellow when cabbage juice is added? A) coffee B) ammonia C) vinegar D) bottled water

Answers

Answer:

B) Ammonia

Explanation:

Red cabbage juice is an acid-base indicator. It turns red for acidic medium and as the pH increase it turns to violet, green and then yellow.

It means for a basic solution, it would turn yellow. From the given options, coffee and vinegar are acidic. Therefore, they would turn red. Bottled water is neutral. Ammonia is a weak base. It would the indicator yellow.

When the amount of a radioactive substance is reduced by 50%, what has occurred? a half-life beta radiation alpha radiation gamma radiation?

Answers

A radioactive material is the heavy nucleus material. When the amount of a radioactive substance is reduced by 50%, a half life has occurred.

What is half life?

In radioactivity, the time interval required for one-half of the atomic nuclei of a radioactive sample to decay .

The time interval required for the number of disintegrations per second of a radioactive material or 50% decomposed is equal to the half life of that material.

Thus, when the amount of a radioactive substance is reduced by 50%, a half life has occurred.

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Find the total translational kinetic energy of 1.5 l of oxygen gas held at a temperature of 0°c and a pressure of 0.8 atm.

Answers

The ideal gas law states that:
[tex]pV=nRT[/tex]
where
p is the gas pressure
V is its volume
n is the number of moles
R is the gas constant
T is the absolute temperature

However, this equation can be also rewritten as
[tex]PV= \frac{2}{3}NK [/tex] (1)
where
N is the number of molecules in the gas, and K is the average kinetic energy of the molecules. Therefore, NK represents the total kinetic translational energy of the gas.

For the gas in our problem,
[tex]p=0.8 atm = 8.08 \cdot 10^4 Pa[/tex]
[tex]V=1.5 L =1.5 \cdot 10^{-3} m^3[/tex]
So, the total translational kinetic energy of the gas is (using eq.(1) )
[tex]NK= \frac{3}{2}pV= \frac{3}{2}(8.08 \cdot 10^4 Pa)(1.5 \cdot 10^{-3} m^3)=181.8 J [/tex]
Final answer:

To calculate the total translational kinetic energy of 1.5 liters of oxygen gas at 0°C and 0.8 atm, use the ideal gas law to find the number of moles and then apply the translational kinetic energy equation (KEtrans = (3/2)nRT).

Explanation:

To find the total translational kinetic energy (KEtrans) of 1.5 liters of oxygen gas at 0°C (273 K) and 0.8 atm, we can use the ideal gas law and the equipartition theorem. The ideal gas law PV = nRT can give us the number of moles of oxygen gas when rearranged to n = PV/RT. Here, P is the pressure, V is the volume, R is the ideal gas constant, and T is the temperature.

Once the moles (n) are calculated, the translational kinetic energy per mole of a gas can be found using the equation KEtrans = (3/2)nRT, where n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin. By substituting the values into the equation, we can find the total translational kinetic energy of the gas sample.

How far the Electromagnetics effects be found

Answers

The electromagnetic effects extends indefinitely throughout space. So it has not limit and it describes the electromagnetic interaction.

The electromagnetic effect has no limits but it decreases inversely with square distance. 

E.M.F = k/d²
where k is the constant of proportionality and d is the distance from the source of electromagnetic field. 

Determine the ratio of the resistivity of pure water to silver?
3:1
1:3
3 x 1011:1
1:3 x 1011:1

Answers

Silver is a very good conductor, this means its resistivity is very low (from table, we can check the precise value, which is [tex]\rho_s = 1.6 \cdot 10^{-8} \Omega m[/tex]).

Pure water, instead, is a very bad conductor, this means its resistivity is very high, of order of [tex]k \Omega \cdot m[/tex] ([tex]10^3 \Omega m[/tex] ). Even without knowing the precise value of the pure water resistivity, we can estimate the ratio between the pure water resistivity and the silver resistivity by comparing the two orders of magnitude:
[tex]r= \frac{10^3 \Omega m}{10^{-8} \Omega m} \sim 10^{11} [/tex]

Therefore, we can say that the correct answer is
[tex]3 \cdot 10^{11} : 1[/tex]

The resistivity is a dependent factor for the ease of allowing electrons to flow. The approximate ratio of the resistivity of pure water to silver is [tex]3 \times 10^{11} :1[/tex].

What is Resistivity?

The property of the material that determines the actual resistance offered by the material to the flow of current through a cross-section area, is known as the resistivity of the material.

Pure water is a bad conductor of electricity which means it offers high resistance to the flow of electric current. So, the standard value of the resistivity of pure water is around [tex]10^{3} \;\rm \Omega.m[/tex].

On the other hand, silver is one of the materials which allows higher conduction of electricity through it, hence it has a lower level of resistivity of the order [tex]1.60 \times 10^{-8} \;\rm \Omega.m[/tex]

So, the ratio of resistivity of water to the silver is,

[tex]=\dfrac{10^{3}}{ 1.6 \times 10^{-8}}\\\\\approx 3 \times10^{11} : 1[/tex]

Thus, we can conclude that the approximate ratio of the resistivity of pure water to silver is [tex]3 \times 10^{11} :1[/tex]

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This can best be explained due to A) density. B) friction. C) gravity. Eliminate D) inertia.

Answers

What can be explained? Perhaps you could give us the full question?

Answer:

D

Explanation:

Which would most likely cause molten rock material to become glassy igneous rock?

Answers

The cooling on earth's surface (extrusive)  makes a molten rock to become glassy. The lava cools so fast that crystals don't have time to form, which makes it glassy. Hope this helps!

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DONT ANSWER IF YOU DONT KNOW!!!
Calculate the diameter of the fifteenth orbit of the hydrogen atom if the diameter of the innermost orbit is 1.06 A. (Hint: Keep three significant figures in your answer.)

Answers

In an atom of hydrogen the orbit radius is given by the formula:
r = n² · α₀

where:
n = number of orbit = 15
α₀ = Bohr radius (innermost radius) = 0.529 Â

Since d = 2 · r, we can write:
d = n² · d₀
   = 15² · 1.06
   =  238.5 Â

Hence, the diameter of the fifteenth orbit of the hydrogen atom is 238.5 Â.

Which is a narrow band of high winds located near the top of the troposphere? a sea breeze a jet stream polar easterly a trade wind?

Answers

The answer is Jet Stream.  A narrow band of high winds located near the top of the troposphere is Jet Stream.  They are narrow bands of strong wind in the upper levels of the atmosphere. The winds blow from west to east in jet streams but often shifts to the north and south. They follow the boundaries between hot and cold air.

Answer:

jet streams

Explanation:

I know the anwser

What would you need to know to calculate the angular momentum of a man on a Ferris wheel?

Answers

The angular momentum calculated with respect to the axis of rotation of an object is given by:
[tex]L=mvr[/tex]
where m is the object's mass, v is its tangential speed, and r is its distance from the axis of rotation.

In case of a man on a Ferris wheel, we need to have these quantities in order to calculate his angular momentum. These quantities corresponds to:
- m, the mass of the man
- v, the tangential speed of the wheel at its edge
- r, the radius of the wheel

It is possible to calculate the angular momentum even if we don't know v, the tangential speed. In this case, we need to know at least the angular velocity [tex]\omega[/tex] (because from this relationship we can find the tangential speed: [tex]v=\omega r[/tex]) or the period of rotation of the wheel, T (because we can find the angular velocity from it: [tex]\omega= \frac{2 \pi}{T} [/tex]).

To calculate the angular momentum of a man on a Ferris wheel you need to know the mass distribution, radius, initial and final angular velocity, and angular acceleration of the system.

Angular momentum of a man on a Ferris wheel can be calculated using the formula:

Angular momentum = Moment of inertia x Angular velocity

To calculate this, you would need to know the mass distribution, radius, initial and final angular velocity, and angular acceleration of the system.

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List the following events in the order that they happen as a sound wave is generated and transmitted through the air.

1. The object's energy transfers to the surrounding air particles.

2. Something causes an object to vibrate.

3. Vibrating air particles bump into other air particles.

4. Air particles around the object begin to vibrate.

5. Energy transfers outward from air particle to air particle.

Answers

Answer: The order is 2,1,5,4,3

Explanation: Hope This helps.

The order in which events occur in the generation and transmission of a sound wave begins with an object vibrating, which transfers energy to air particles, leading to the vibration of surrounding air and the eventual transfer of energy from particle to particle, forming a sound wave.

Sound is produced and travels through a medium via a series of events that can be listed in sequential order:

Something causes an object to vibrate.

The object's energy transfers to the surrounding air particles.

Air particles around the object begin to vibrate.

Vibrating air particles bump into other air particles.

Energy transfers outward from air particle to air particle.

For example, when a tuning fork is struck, its tines vibrate and cause air molecules nearby to oscillate. These vibrations propagate outward as successive air molecules collide, similar to ripples in water when a stone is thrown. This movement of air molecules forms a sound wave, which can be detected by the ear as changes in air pressure and interpreted as sound.

What is the total resistance of three 6-ohm resistors hooked in parallel

Answers

The equivalent resistance of n resistors in parallel is given by
[tex] \frac{1}{R_{eq}}= \frac{1}{R_1}+ \frac{1}{R_2}+...+ \frac{1}{R_n} [/tex]

In this case, we have three resistors of [tex]6 \Omega[/tex] each, so their equivalent resistance when they are connected in parallel is
[tex] \frac{1}{R_{eq}}= \frac{1}{6 \Omega}+ \frac{1}{6 \Omega}+ \frac{1}{6 \Omega}= \frac{3}{6 \Omega} [/tex]
Which gives
[tex]R_{eq}= \frac{6 \Omega}{3}=2 \Omega [/tex]

Put these events of a chain reaction in order from first to last. Many atoms fission. Neutrons are produced. An atom fissions. Neutrons find other atoms.

Answers

The correct order is the following:

1) An atom fission
2) Neutrons are produced
3) Neutrons find other atoms
4) Many atoms fission

This is the description of a fission chain reaction: initially, the reaction starts with the fission of an atom with unstable nucleus. In the fission, neutrons are produced, and they travel through the surrounding medium. Eventually, they meet other atoms and they are captured by their nuclei: the nuclei become unstable and they undergo fission as well.

A force of 50 pounds is directed 30 from the horizontal, find the vector that represents this force.

Answers

I assume it is directed 30 degrees above the positive x-axis. F = 50 pounds F_x = 50 cos(30) pounds = 43.3 pounds F_y = 50 sin(30) = 25 pounds Let i and j be unit vectors along the x and y axes, respectively.  Then F = F_x i + F_y j = (43.3 i + 25 j) pounds
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