alana drew a diagram to compare the life cycles of low-mass and high-mass stars. a venn diagram with 2 intersecting circles. the left circle is labeled low-mass stars and the right circle is labeled high-mass stars. there is an x in the low-mass stars circle, z in high-mass stars circle and y in the intersecting areas. which labels belong in the areas marked x, y, and z?
Low mass stars vary in that they have longer life cycles and develop into white dwarfs. Supernova explosions occur in high mass stars, which also have shorter life cycles.
What should be said about a Venn diagram?Circles are used in a Venn diagram to depict the relationships between individual items or small groups of things. Circles that overlap have certain qualities, but circles that do not overlap do not. Venn diagrams help you to more easily see the relationships and differences between two ideas.
What should be said about a Venn diagram?Circles are used in a Venn diagram to depict the relationships between individual items or small groups of things. Circles that overlap have something in common, but circles that don't share nothing.
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In the figure, a solid cylinder of radius 23 cm and mass 12 kg starts from rest and rolls without slipping a distance L = 6.4 m down a roof that is inclined at angle ? = 37
The final speed of the solid cylinder, after rolling without slipping a distance of 6.4 m down the inclined roof with an angle of 37 degrees, is approximately 4.77 m/s.
To find the final speed of the solid cylinder, we can use the principle of conservation of energy. The potential energy at the starting point is converted into both translational kinetic energy and rotational kinetic energy at the bottom of the roof.
The potential energy (PE) at the starting point is given by:
PE = mgh,
where m is the mass of the cylinder, g is the acceleration due to gravity, and h is the vertical height of the roof.
The translational kinetic energy (KE_trans) is given by:
KE_trans = 0.5 mv^2,
where v is the final speed of the cylinder.
The rotational kinetic energy (KE_rot) is given by:
KE_rot = 0.5 Iω^2,
where I is the moment of inertia of the cylinder and ω is its angular velocity.
Since the cylinder is rolling without slipping, the relationship between linear velocity (v) and angular velocity (ω) is:
v = rω,
where r is the radius of the cylinder.
The moment of inertia of a solid cylinder about its axis of rotation is given by:
I = 0.5 mr^2.
Substituting the equations and given values into the conservation of energy equation, we have:
mgh = 0.5 mv^2 + 0.5 (0.5 mr^2) (v/r)^2.
Simplifying the equation, we find:
gh = 0.5 v^2 + 0.25 v^2.
Solving for v, we get:
v = √((2gh) / 0.75).
Substituting the values of g, h, and the given angle into the equation, we find that v ≈ 4.77 m/s.
The final speed of the solid cylinder, after rolling without slipping a distance of 6.4 m down the inclined roof with an angle of 37 degrees, is approximately 4.77 m/s. The conservation of energy principle allows us to relate the potential energy at the starting point to the combined translational and rotational kinetic energies at the bottom.
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Jorge is driving along Route 120 at a speed of 25 m/s. Seeing a red light ahead, he applies the brakes and comes to rest in 3.7 seconds. What is
his rate of acceleration?
Answer:
I don't know...
I'm sorry
(d) if your mass is 55 kg and you are standing on the equator, what is your personal rotational energy about the earth's north-south axis?
Standing on the equator, your own rotational energy about the Earth's north-south axis is roughly 1.13 x 1011 joules.
How does the Earth's axis rotate?The Earth orbits the sun with an inclination of 23.45 degrees and rotates on its axis in reference to the sun every 24.0 hours of mean solar time. Mean solar time is created by averaging out the variations caused by the Earth's non-circular orbit.
We must apply the formula for rotational kinetic energy in order to determine your individual rotational energy about the north-south axis of the Earth: K_rot = (1/2)Iω²
A solid sphere with mass M and radius R spinning about its diameter has a moment of inertia of I = (2/5)MR2.
The angular velocity, which is equal at all sites along the equator, can be calculated using the formula: = 2/T.
If we enter these numbers into the rotating kinetic energy formula, we get the following results:
K_rot = (1/2)Iω²
= (1/2)(2/5)MR²(2π/T)²
The following results are obtained by substituting your mass (M = 55 kg) with the supplied values of the Earth's radius (R = 6,371 km = 6,371,000 m):
K_rot = (1/2)(2/5)(55 kg)(6,371,000 m)²(2π/24 hours)²
= 1.13 x 10¹¹ joules
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A shop owner wanted to sell a gold-coloured cube to Mr Lee for $2000. The shop
owner claimed that it was made of pure gold. Mr Lee wanted to investigate whether
the shop owner's claim was true. He measured the length and mass of the cube,
and found that it was 2 cm and 100 g respectively. He also found out that the density
of pure gold is 19.3 g/cm?State whether the shop owner's claim is true. Explain your answer.Is density a useful physical property for identifying an unknown substance? Explain why.
Answer:
shop owner's claim is NOT true
12.5g/cm^3 does not equal density of real gold is 19.3 g/cm^3
Explanation:
density of pure gold is 19.3 g/cm^3
length and mass of the cube 2 cm and 100 g
match the units
2 cm to cm^3 = 2^3 = 8 cm^3
8 cm^3
real gold : 19.3 g/cm^3 units are g/cm^3
gold-coloured cube to be sold : 100g/8 cm^3 = 100 divided by 8 =
12.5g/cm^3 does not equal density of real gold is 19.3 g/cm^3
shop owner's claim is NOT true
socraticorg
how to find the wavelength of peak intensity of an object that emits thermal radiation
To find the wavelength of peak intensity of an object that emits thermal radiation, Wien's law can be used. This law states that the wavelength of peak intensity of an object emitting thermal radiation is inversely proportional to its temperature. if the temperature of an object is 500 K, the wavelength of peak intensity can be calculated as:
λmax = b/T= 2.898 × 10⁻³ m·K / 500
K= 5.796 × 10⁻⁶ m
To find the wavelength of peak intensity of an object that emits thermal radiation, Wien's law can be used.
In other words, the higher the temperature of an object, the shorter the wavelength of peak intensity of the thermal radiation it emits. Mathematically, Wien's law can be expressed as:
λmaxT = b
where λmax is the wavelength of peak intensity, T is the temperature of the object in Kelvin, and b is a constant called Wien's displacement constant, which is equal to 2.898 × 10⁻³ m·K.
To find the wavelength of peak intensity, divide Wien's displacement constant by the temperature of the object in Kelvin. The result will be in meters, which can be converted to any other unit of length as needed. For example, if the temperature of an object is 500 K, the wavelength of peak intensity can be calculated as:
λmax = b/T= 2.898 × 10⁻³ m·K / 500
K= 5.796 × 10⁻⁶ m
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What happens when light from the Sun passes through any type of matter? The light slows down.
The light speeds up.
Most of the light is absorbed.
Most of the light is reflected.
Answer:
A
Explanation:
THE LIGHT SLOWS DOWN
When light from the Sun passes through any type of matter the light slows down.
Interaction of sunlight with matter:The behavior of light from the Sun as it interacts with any matter depends on the matter and its properties.
Since it comes through a vacuum and enters our atmosphere which is a denser medium and has a definite refractive index, the light slows down.
This also happens when light falls on material such as glass, water, and other transparent and translucent media. When it emerges out of such medium to a rarer medium like air, it speeds up to its initial speed.
A portion of the sunlight is absorbed by almost all the matter present on earth that's why something heats up when exposed to sunlight. While a considerable portion of the sunlight is reflected by the matter.
But the question says what happens when it passes through any matter. The answer is:
It slows down while passing through the matter since any matter is optically denser than the vacuum.
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Why do psychologists conduct twin studies? What is the major
benefit of this?
Answer in one to two complete sentences.
Answer:
Its to make sure that the results are reliable.
If you make only one test, the person could have messed up so if there is a twin test, you know something is screwed up in the results so they know the try again and make sure they don't skrew up again.
Explanation:
A soccer player kicks a ball with a force of 900 newtons. The ball has a mass of 0.5 kilograms. At what rate will the ball accelerate?
I WILL MARK BRAINLIEST FOR THE CORRECT ANSWER
Answer:
1800
Explanation:
force = mass times acceleration
What is thermal energy.
Explanation:
thermal energy refers to the energy contained within a system that is responsible for its temperature. Heat the flow of thermal energy
a resistance of 60ohms allows 0.4 amps of current to flow when it is connected across a battery. what is the voltage of the battery?
Answer:
V = 24 [V]
Explanation:
To solve this problem we must use ohm's law, which tells us that the voltage is equal to the product of resistance by the current.
V = I*R
where:
V = voltage [V]
I = current [amp]
R = resistance [ohm]
Therefore:
V = 0.4*60
V = 24 [V]
how accurately can the position of a 5.00- kev electron be measured assuming its energy is known to 1.00 % ?
The position of a 5.00-keV electron can be measured with an uncertainty given by the Heisenberg uncertainty principle, which is inversely proportional to the uncertainty in its momentum. Assuming its energy is known to 1.00%, we can estimate the uncertainty in its momentum and therefore in its position.
The energy of the electron can be related to its momentum through the equation E = p²/2m, where p is the momentum and m is the mass of the electron. Rearranging this equation gives p = √(2mE). Since the energy is known to within 1.00%, the uncertainty in the momentum is also 1.00%.
Using the Heisenberg uncertainty principle, Δx Δp >= h/4π, where Δx is the uncertainty in position, Δp is the uncertainty in momentum, and h is Planck's constant. Substituting Δp = 1.00% of p and the values for m and E, we can solve for Δx.
The result is an uncertainty in position of approximately 1.05 x 10⁻¹⁰ meters, or about 0.1 angstroms. Therefore, the position of the electron can be measured with reasonable accuracy, even though its energy is known only to within 1.00%.
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If a photon has a frequency of 5.20 x 1014 hertz, what is the energy of the photon? Given : Planks constant is 6.63 x 10 -34 joule.seconds
The energy of the photon can be calculated using the equation E = h * f, where E is the energy, h is Planck's constant (6.63 x 10^-34 Js), and f is the frequency of the photon (5.20 x 10^14 Hz). Plugging in the values, we get:
\(E = (6.63 x 10^-34 Js) * (5.20 x 10^14 Hz) = 3.48 x 10^-19 J\)
How does the energy of a photon change as its frequency increases?The energy of a photon is directly proportional to its frequency. As the frequency of a photon increases, so does its energy. This relationship is described by the equation E= hf, where E is the energy of the photon, h is Planck's constant, and f is the frequency of the photon. Therefore, if the frequency of a photon increases, the energy of that photon will also increase. This is why high-frequency photons, such as X-rays and gamma rays, have higher energies than low-frequency photons, such as radio waves.
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Plugging in the values, we get: E = (7.03 × 10⁻⁹ C/m²) / (2 * 8.85 × 10⁻¹² C²/Nm²) = 397 N/C Since the sheet is finite, the electric field at a point 0.100 mm above the center of the sheet will be slightly less than this value. However, this approximation is reasonable for this problem.
By plugging in the given values into the formula for the electric field created by an infinite charged sheet, we found that the electric field at a point 0.100 mm above the center of the sheet is approximately 397 N/C.
To begin, let's recall the formula for the electric field created by an infinite charged sheet. The electric field above an infinite charged sheet is given by:
E = σ / (2ε₀),
where E represents the electric field, σ is the surface charge density, and ε₀ is the electric constant (also known as the vacuum permittivity).
Now, we can plug in the given values into the formula to find the electric field. The surface charge density σ is given as 7.03 × 10⁻⁹ C/m², and the electric constant ε₀ is 8.85 × 10⁻¹² C²/Nm².
Substituting these values into the formula, we get:
E = (7.03 × 10⁻⁹ C/m²) / (2 * 8.85 × 10⁻¹² C²/Nm²).
Now, let's calculate this expression:
E = (7.03 × 10⁻⁹) / (2 * 8.85 × 10⁻¹²) C/m² * Nm²/C².
By simplifying the expression, we find:
E = (7.03 / 2 * 8.85) × (10⁻⁹ / 10⁻¹²) N/C.
E = 397 N/C (approximately).
So, the electric field at a point above the center of the sheet is approximately 397 N/C.
However, it is important to note that the sheet is finite, not infinite. In reality, the electric field at a point 0.100 mm above the center of the sheet would be slightly less than the calculated value of 397 N/C. This is because the finite nature of the sheet affects the electric field distribution around it. However, for the purposes of this problem, using the calculated value as an approximation is reasonable.
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Why the v of power supply doesnt equal to the v of light bulb
The voltage of a power supply and a light bulb are not necessarily equal due to the passive nature of the bulb and fluctuations in the power supply.
The voltage (v) of a power supply is not necessarily equal to the voltage across a light bulb because of the way that electrical circuits work. In a circuit, voltage is the measure of electrical potential energy that exists between two points. A power supply generates electrical potential energy, which flows through the circuit, providing the energy necessary for electrical components to function.
A light bulb, on the other hand, is a passive component that resists the flow of electrical current, converting the electrical energy into light and heat. When current flows through the light bulb, some of the energy is dissipated as heat and light, which reduces the voltage across the bulb.
Furthermore, the voltage of a power supply can fluctuate due to variations in the input voltage or changes in the load on the circuit. In contrast, the voltage across a light bulb is determined by the electrical properties of the bulb, such as its resistance and the amount of current flowing through it.
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A bowling ball moves 18 meters every 2 seconds down the lane at a bowling alley. What is the speed of the bowling ball?
Answer:
9m/s
Explanation:
18/2 = 9m/s
A potter's wheel moves from rest to an angu-
lar speed of 0.10 rev/s in 24.6 s.
Assuming constant angular acceleration.
what is its angular acceleration in rad/s?
Answer in units of rad/s
Answer:
angular acceleration =final angular speed + initial angular speed
time
=0.6283rad/s +0
24.6s
=0.6283/24.5
=0.025rad/s^2
Explanation:
first angular speed is equal to angular velocity and we will convert the unit to rad/s so 1rev/sec=6.283rad/s then angular acceleration is the rate at which the angular velocity changes with the time we have the final angular velocity,initial angular velocity and time now substitute the numbers in the formula and the value will be 0.025 rad per seconde square
the power factor of a circuit is 0.6 lagging. the power delivered in watts is 400. if the input voltage is 60 v sin(ωt 15°), find the sinusoidal expression for the input current.
The sinusoidal expression for the input current is 4.81 sin(ωt + 107.3°)
.
The power factor (PF) is the cosine of the phase angle between the voltage and current waveforms in an AC circuit. In this case, since the power factor is 0.6 lagging, the angle between the voltage and current waveforms is 53.13° (90° - arccos(0.6)).
To find the sinusoidal expression for the input current, we need to use Ohm's Law, which states that V = IZ, where V is the voltage, I is the current, and Z is the impedance of the circuit. In this case, since we know the power delivered (P) and the input voltage (V), we can use the formula P = VIcosθ to find the impedance.
P = VIcosθ
400 = 60Icos(53.13°)
I = 4.81 A
Therefore, the sinusoidal expression for the input current is I = 4.81 sin(ωt + 107.3°), where ω is the angular frequency (2πf) and t is the time. The phase angle of 107.3° represents the 53.13° phase shift between the voltage and current waveforms.
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a rectangular current loop with a clockwise current is in a uniform magnetic field. what is the direction of the net force on the loop?
The direction of the magnetic force on the loop is going inside the loop. If the loop place on the paper, the magnetic force going through the paper.
If a loop of wire is electrified there will be a uniform magnetic field. We use the right-hand rule for loops to calculate the direction of the magnetic field. The rules are
Curl your fingers according to the direction of the current flows.Thumb points in the direction of magnetic force.Imagine a loop on paper. A clockwise current on the loop, curl your fingers, and go in a clockwise direction.
Your thumb gonna points down and the magnetic force going inside the paper.
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a 10-volt power supply is placed in series with two 5-ohm resistors. what is the current in the circuit after it passes through each of the two resistors?(1 point)
The current in the circuit after passing through each 5-ohm resistor is 1 Ampere, using Ohm's Law.
To compute the ongoing in the circuit, we can utilize Ohm's Regulation, which expresses that the ongoing moving through a circuit is straightforwardly corresponding to the voltage and contrarily relative to the opposition.The all out opposition of the circuit is equivalent to the amount of the singular protections in series, which is 5 ohms + 5 ohms = 10 ohms.Utilizing Ohm's Regulation, we can compute the ongoing in the circuit as follows:
I = V/R
Where I is the current, V is the voltage, and R is the opposition.Subbing the qualities, we get:
I = 10 V/10 ohms = 1 Ampere
Subsequently, the ongoing in the circuit after it goes through every one of the two 5-ohm resistors is 1 Ampere.
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How much net force is acting on a 50 kg falling object that has reached terminal velocity?
0 N
50 N
100 N
500 N
Answer:
Net force would be zero
Explanation:
It's still receiving a gravitational force of almost 500 Newtons downward, but because it has reached terminal velocity, that means it's also receiving an opposite and roughly equal force due to friction with the air. The two balance out for a total of zero.
Answer:
0 N
Explanation:
A friend of yours who has not taken an astronomy class looks at your textbook and really likes the picture of the Pleiades, a cluster of stars surrounded by a bluish reflection nebula. She wants to know what causes that beautiful blue glow. To explain it to her, you want to compare the process that causes the blue glow to something that is in your friend's everyday experience. Which of the following terrestrial phenomena is the result of the same type of process that makes a reflection nebula in space?
A. the blueish glow of the flame on a gas stove
B. the blue light you see reflected from a blue sweater
C. the blue colour of the Earth's sky
D. the blue-white colour of the hottest stars
E. the blue feeling you get when you don't do well on an astronomy exam
Answer:
C. the blue colour of the Earth's sky
Explanation:
The Pleiades is a cluster of sister stars that are among the closest star cluster to earth.
The reflection nebula of the Pleiades is due to the scattering of the blue light from the hot blue luminous stars that dominate the star cluster. Th blue light is scattered from dust molecules, thought to be predominantly carbon compound like diamond dusts, and other compounds like iron.
The blue colour of the Earth's sky is the closest terrestrial phenomenon to the reflection nebula. On a clear cloudless day, molecules in the air scatter the blue component of light more than the other component colours of white light, giving the sky its characteristic blue coluor.
The common characteristics of the luminous nebula and the Earth's blue sky is that they both have their light scattered by the presence of small particles.
a ball rolling down an incline has its minimum speed a. at the end the incline. b. half way down the incline. c. near the top of the incline. d. impossible to predict without knowing the ball's mass e. impossible to predict without knowing the size of the ball
A ball rolling down an incline has its minimum speed near the top of the incline
What is incline?To bend and incline the head or body forward, to tilt, to attract to an opinion or action.Deviation from line, direction or course Deviation from vertical or horizontal volunteers at a special school for art-loving children. A recent example online was then-Vice President Joe Biden, who tended to offer more weapons. Common synonyms for tendencies include bias, disposition, and disposition. While these words all mean to influence someone to take an attitude or adopt something propensity is the endorsement of one of two or more actions or conclusions.To learn more about incline from the given link :
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a 69.3-kg boy is surfing and catches a wave which gives him an initial speed of 1.60 m/s. he then drops through a height of 1.58 m, and ends with a speed of 8.51 m/s. how much nonconservative work (in kj) was done on the boy?
The non-conservative work done on the boy is 1.34569 kJ.
What is non-conservative work ?Non-conservative work is work done on an object by a force that depends on the path taken between the initial and final positions. To find the non conservative work done on the boy, we need to calculate the change in his mechanical energy due to non conservative forces. The mechanical energy of the boy is the sum of his kinetic energy and potential energy:
E = K + U
where K is the kinetic energy and U is the potential energy.
At the start of the wave, the boy has only kinetic energy, which we can calculate as:
K1 = \(0.5 * m * v1^2\)
= \(0.5 * 69.3 kg * (1.60 m/s)^2\)
= 88.96 J
where m is the mass of the boy and v1 is his initial speed.
When he drops through a height of 1.58 m, he loses potential energy equal to:
U1 - U2 = m * g * h
= \(69.3 kg * 9.81 m/s^2 * 1.58 m\)
= 1059.18 J
where g is the acceleration due to gravity and h is the height of the drop.
At the end of the drop, the boy has both kinetic and potential energy, which we can calculate as:
K2 = \(0.5 * m * v2^2\)
= \(0.5 * 69.3 kg * (8.51 m/s)^2\)
= 2493.83 J
U2 = m * g * h
= \(69.3 kg * 9.81 m/s^2 * 0\)
= 0 J
where v2 is his final speed.
Therefore, the initial mechanical energy of the boy is:
E1 = K1 + U1
= 88.96 J + 1059.18 J
= 1148.14 J
The final mechanical energy of the boy is:
E2 = K2 + U2
= 2493.83 J + 0 J
= 2493.83 J
The change in mechanical energy is:
ΔE = E2 - E1
= 2493.83 J - 1148.14 J
= 1345.69 J
This represents the work done on the boy by non conservative forces, so we can convert it to kilojoules:
ΔE = 1.34569 kJ
Therefore, the non conservative work done on the boy is 1.34569 kJ.
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How is the kinetic energy of the particles that make up a substance different
after it changes state?
A. The kinetic energy is greater after a substance changes from a
liquid to a solid.
O B. The kinetic energy is less after a substance changes from a gas to
a liquid.
C. The kinetic energy is greater after a substance changes from a
plasma to a gas.
D. The kinetic energy is less after a substance changes from a liquid
to a gas.
SUBUHI
All particles have energy, and the energy varies depending on the temperature the sample of matter is in, which determines if the substance is a solid, liquid, or gas. Solid particles have the least amount of energy, and gas particles have the greatest amount of energy
a wheel of diameter 3.00 cm has a 4.00 m cord wrapped around its periphery. starting from rest, the wheel is given a constant angular acceleration of 4.00 rad/s2. how long will it take the cord to unwind?
The wheel of diameter 3cm will take 16.35s to unwind the cord of length 4m with constant angular acceleration of 4rad/s².
=ω\(_{i}\)t+ \(\frac{1}{2}\) αt²
But ⍵\(_{i}\) = 0
So, = \(\frac{1}{2}\) αt² ----- (1)
= \(\frac{S}{r}\) ;
S= 4m and r = \(\frac{3}{2}\) = 1.5cm = 0.015m
= \(\frac{4}{0.015}\) = 267 rad
Using this value of in eq. (1)
267 = \(\frac{1}{2}\) × 2 × t²
t² = 267
t = \(\sqrt{267}\)
t = 16.35s
Constant angular acceleration is when an object's angular velocity changes by the same amount in every equal time interval.
Acceleration is the rate of change of haste with respect to time.
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A satellite was in two separate crashes. In both crashes, the satellite had the same mass. Engineers want to know about the speed and direction of the satellite after the crashes. Why would the crash affect the motion of the satellite, and which crash caused a greater change in motion for the satellite?
Read the question and use the picture to help you with this one
use all 3 of the sentence starters
-The speed and direction of the satellite was
-The crash affected the motion of the satellite because . . .
-The _____ crash caused . . .
PLEASE HURRYYYY
Answer & Explanation:
Crashing into the asteroid would cause the satellite to slow down, stop, or reverse direction, because it is a force in the opposite direction to the satellite's motion. Whichever crash was a stronger force would cause it to change motion more. It takes a stronger force to change the velocity of a more massive object.
which would be a better predictor of increase in force of contraction, change in semg amplitude of spikes or change in semg frequency of spikes?
The better predictor of increase in force of contraction, change in semg amplitude of spikes.
What is force?A force in physics is an effect that has the power to alter an object's motion. An object with mass can change its velocity, or accelerate, as a result of a force. An obvious way to describe force is as a push or a pull. A force is a vector quantity since it has both magnitude and direction.
Given that in the question the better predictor of increase in force of contraction, change in semg amplitude of spikes or change in semg frequency of spikes.
The better predictor of increase in force of contraction, change in semg amplitude of spikes.
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Shiela was cramming for a german quiz right before her french test. when she took the test, she could not remember any of the french terms, only german. this is an example of...
In French, there are four levels (A1, A2, B1, and B2). A1 — After 100 to 150 hours of French study, anyone can take this test. A1 Junior – This version of A1 is designed for kids between the ages of 12 and 14.
What percentage of French words are Germanic?Frankish was not the only source of Germanic words in French, even though it accounts for about 10% of words in Modern French. Old Norse and Old English made contributions through Norman French, as did Gothic languages like Burgundian.
German and French are distinct enough from one another that you won't confuse the two, but not so distinct that you can't transfer your knowledge between the two. German is a Germanic language like English, whereas French is a Romance language that is descended from Latin. As a result, learning them isn't all that similar.
Example
Bonjour is a common salutation that translates to "hello" or "good morning."Adieu, or good-bye.Yes, it is.Non: no.Merci, or please.Very highly appreciated: thank you.Fille: femaleBoy, GarçonTo learn more about 'French words' refer to
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which best esplains how the body maintains homeostasis.
a. All systems work together to stabilize the body .
b. Each systems work indepently to stabilize the body .
c. All systems works together to match the external environment.
d. Each system works indepently to match the external evironment.
a. all systems work together to stabilize the body