The read of a scale when a piece of brass is submerged in water (and its apparent weight) can be determined using the following formula: W App = 242N.
Can you put brass in the water?Brass weakens and lost its zinc component quite quickly when immersed in water, endangering the metal's structural integrity. Due of its incredible endurance, brass is a superb metal for various applications other than those in which it is submerged in water.
brass gets wet, what happens?Brass tarnishes when exposed to moisture, whether from being used in the bath or from perspiration on our bodies. This is a very normal occurrence. Jewelry made of brass metal occasionally develops a darker patina as it ages. A coating of the brass is covered in patina, which is a greenish tint.
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if 8.0 mg of a radioactive substance naturally decays to 0.50 mg over 184 days, what is the half-life of the radioisotope?
According to the given statement 46 days is the half-life of the radioisotope.
What is radioisotopes used for?An unstable chemical element that releases radiation as it breaks down and becomes increasingly stable. Both the natural environment and a laboratory can produce radioisotopes. They are used in medical imaging research and therapy.
Briefing:A radioactive substance's half life can be predicted by:
Nt = No(1/2)^(t/th)
Nt is the amount remaining (mg)
No is the initial amount (mg)
t is the time elapsed, in days
th is the half life in days.
Nt = No(1/2)^(t/th)
0.50mg = (8.0mg)(1/2)^(184 days/th)
We can resolve this for Th using logs.
th = 46 days
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9. a cluster of galaxies is observed to have a recessional velocity of 60,000 km/s. find the distance to the cluster.
The distance to the cluster is 2.86 billion lightyears. So the correct answer is B. 2.86 billion lightyears.
Distance is a measure of how far apart two objects are from each other. It can be expressed in a variety of units, such as meters, kilometers, miles, or lightyears. In physics and astronomy, distance is often used to describe the separation between two objects in space, such as planets, stars, or galaxies. Distance is an important concept because it helps us understand the size and scale of the universe and how objects within it are related to each other.
To calculate the distance to the cluster of galaxies, we can use the formula:
Distance = (Recessional velocity) / (Hubble constant)
Plugging in the values:
Distance = (60,000 km/s) / (21 km/s/million lightyears)
Distance = 2,857,142.857 million lightyears
Distance = 2.86 billion lightyears
The missing part in the question is shown below.
A cluster of galaxies is observed to have a recessional velocity of 60,000 km/s. find the distance to the cluster. (Assume a hubble constant of 21 km/s per million lightyears).
A. 2.70 billion lightyears
B. 2.86 billion lightyears
C. 1.30 million lightyears
D. 1.26 billion lightyears
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The SI units for position, velocity, and acceleration are, respectively: Question 11 options: m, m/s, m/s^2 kg, m/s, m^2/s m, m/s, m^2/s kg, m/s, m/s^2
Answer:
Explanation:
position: m
velocity: m/s
acceleration: m/s²
George is playing the piano. The note A5 has a frequency of 880 hertz. If the speed of sound at 30°C is
350 meters/second, what is the wavelength of this note at that temperature?
Part A: Enter the variable symbol for the quantity you need to find.
This note's wavelength is 0.3977m at that temperature.Greek symbol is used to represent the wavelength at which the most radiation is emitted (lambda).
A temperature wavelength is defined?Greek symbol is used to represent the wavelength at which the most radiation is emitted (lambda). T stands for the item's temperature in Kelvin, and the constant is 2,897 m. (micrometers).The molecules will vibrate more quickly and at a shorter wavelength at higher temperatures, as shown by the formula max = b / T.Where b = 2.8977719 mmK is the Wien's displacement constant and max is the previously mentioned peak wavelength of light; T is the black body's absolute temperature.Explanation:
Wavelength = 350/880
= 0.3977m.
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Answer:
0.40 meters
Explanation:
When calculated out the wavelength is about 0.40 meters. Calculation is 350 / 880
a metallic laboratory spring is typically 5.00 cm long and 0.150 cm in diameter and has 50 coils. for related problemsolving tips and strategies, you may want to view a video tutor solution of calculating self-induced emf. part a if you connect such a spring in an electric circuit, how much self-inductance must you include for it if you model it as an ideal solenoid?
Self Inductance:
1.11 x 10^-7 H is the solenoid inductance
What is Self Inductance of a coil?The characteristic of a current-carrying coil that opposes or resists a change in the current running through it is called self-inductance. This mostly happens because of the self-induced emf that the coil produces. In layman's words, we can also state that self-inductance is a phenomenon where a voltage is induced in a wire that carries current.
Calculation:Given;
The spring's dimensions are
length L= 5 cm (0.05 m),
diameter = d 0.15 cm
radius = r = 0.075 cm (0.00075 m).
There are 50 coils in the spring.
N = 50;
The spring's area is determined using the formulas below;
A = π [tex]r^{2}[/tex]
A = 3.14 × (0.00075)^2
A = [tex]1.77[/tex] × [tex]10^-6[/tex] [tex]m^2[/tex]
The inductance of a solenoid is;
L = [tex]\frac{N^2 A}{l}[/tex]
L = [tex]1.11[/tex]×[tex]10^-7[/tex] H
1.11 x 10^-7 H is the solenoid inductance that needs to be accounted for in the model.
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A mountain climbing expedition establishes a base camp and two intermediate camps, A and B. Camp A is 11,200 m east of and 3,200 m above base camp. Camp B is 8,400 m east of and 1,700 m higher than Camp A. Determine the displacement between base camp and Camp B.
Drawing: Math: Resultant:
Answer: 3275.7 m
Explanation:
displacement in x direction: 11200 - 8400 = 2800
displacement in y direction: 1700
displacement A - B:
[tex]\sqrt{2800^{2} + 1700^{2} }[/tex] = 3275.7
if the ring is off center when it hits the disk how will that affect the results? think about the effect on the moment of inertia
If the ring is off-center when it hits the disk, the disk will still spin, but the moment of inertia will be affected.
The off-center location of the ring will cause the disk to be unbalanced, which will cause the moment of inertia to be lower than it would be if the ring were centered. This means that the disk will not spin as rapidly or as long as it would if the ring were centered.
This means that the rotational energy of the ring will not be distributed evenly and the result will be an unbalanced, or skewed, rotation. This will cause an inaccurate measurement of the moment of inertia, as the off-center ring will not be able to provide a true representation of the rotational energy.
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mechanical energy is select one because the roller coaster select one energy due to friction and air resistance as it travels down the track.State True or False your answer:
a. True
b. False
True, Mechanical energy is chosen because the roller coaster chooses one energy owing to friction and air resistance as it travels down the track.
what is friction ?
When we throw a ball on the ground, it starts moving with a certain speed. But ideally there would be no force acting in the direction of motion and according to Newton's first law the ball would keep rolling, but this doesn't happen. Instead, the ball stops after traveling a certain distance, so a force must be applied to it. We call this force "friction".
Friction provides the traction needed to walk without slipping. Friction is useful in most cases. However, they also offer a major countermeasure to movement. In addition, about 20% of car engine power is consumed to overcome friction in moving parts. In the next section, we take a look at some of these factors.
True Mechanical energy is chosen because the roller coaster chooses one energy owing to friction and air resistance as it travels down the track.
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what is the minimum speed that the bucket must swing so that the bucket does not come crashing down at the top of its loop
The minimum speed that the bucket must swing so that the bucket does not come crashing down at the top of its loop is v = [tex]\sqrt{rg}[/tex]
Fc = Fg
mac = mg
ac = g
ac = v^2/r
v^2/r = g
The pace at which the distance a moving item travels changes is measured as speed. Since speed is a scalar, it has magnitude but no direction as a unit of measurement.
Speed is the rate at which anything moves over a predetermined distance.
an object that moves quickly and with high speed, covering a lot of ground in a short time. A slow-moving object with a low speed, on the other hand, covers a comparatively short distance in the same amount of time. An item with zero speed is stationary.
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consider the following circuit. after leaving the switch at the position a for a long time, move the switch from a to b. there will be current oscillations.
After leaving the provided switch at the given position for a longer time, then its moves given switch from a to b. At t = 0, the left part of the plate C has charge q=max and therefore, the current flowing through it is zero.
What are Oscillation ?
Oscillation is the repetitive or periodic variation, usually in time, of a few degree approximately a crucial value (regularly a factor of equilibrium) or among or extra one-of-a-kind states. Familiar examples for all oscillation encompass a swinging type of pendulum with alternating current. A wave is stated to oscillate, which means to transport to and fro in a regular, repeating way.
This fluctuation may be among extremes for all position, like force, or quantity. Different sorts of waves have one-of-a-kind sorts of oscillations. Longitudinal type of waves: here Oscillation is parallel route of the wave.
The maximum charge stored in the capacitor is,
Q== CE
i=0
At t=t/4 the left part of the plate C has charge q = 0 and therefore, the current flowing through it is clockwise.
i= clockwise
At t=t/2, the left part of the plate C has charge q=-9max and therefore, the current flowing through it is zero.
i=0
At t=3t/4, the left part of the plate C has charge q=0 and therefore, the current flowing through it is counter clockwise.
i=counter clockwise.
At t = 0, the left part of the plate C has charge q=max and therefore, the current flowing through it is zero.
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four copper wires of equal length are connected in series. their cross-sectional areas are 1.08 cm2, 1.94 cm2, 3.08 cm2, and 5.06 cm2. a potential difference of 120 v is applied across the combination. determine the voltage across the 1.94 cm2 wire.
The voltage applied across 1.94 cm² wire is22.1 V
We are given that
A₁ = 0.7 cm² = 1.08*10⁻⁴ m²
A₂= 2.5 cm² = 1.94*10⁻⁴ m²
A₃= 2.2 cm² = 3.08*10⁻⁴ m²
A₄= 3 cm² = 5.06*10⁻⁴ m²
Using 1cm²=10⁻⁴ m²
We know that using resistance formula we can calculate voltage
R = ρL/A
In series
R=R₁+R₂+R₃+₄
R=ρL/{A₁+ρL/{A₂}+ρL/{A₃}+ρL/{A₄}
Substitute the values
R = ρL/(2.62*10⁴)
V = 120v
I = V/R
I = 120 / {ρL(2.62*10⁴)}
Now the voltage across can be determined.
Voltage across the 1.94 square cm wire=IR=I*(ρL/A₂)
Voltage across the 1.94 square cm wire=ρL/ 1.94*10⁻⁴=22.1 V
Voltage across the 1.94 square cm wire=22.1 V
Therefore, The voltage applied across 1.94 cm² wire is22.1 V
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Consider a 100-kg box of tools in the locations A, B, and C from greatest to least, rank the masses of the 100-kg box of tools.
A) Earth
B) Moon
C) Jupiter
The arrangement of the masses at each point would give us;
Earth = Moon= Jupitar
The arrangement of the weights would give;
Moon < Jupitar < Earth
What is the masses of the tools?We know that mass is a measure of the quantity of matter that is present in a body. We can also define the mass of a body as the measure of the inertia of the body. The term inertial has to do with the reluctance to move. Hence, as the reluctance of an object towards motion is increasing, the inertia of the body is also on the increase.
We know that the mass of the object would not change. This is because the mass of an object is a constant. Whether on the moon, on the sun or on Jupiter, the mass of the object is not going to change.
However, the weight of the object has to do with the gravitational pull of the object. This implies that the point where the gravitational pull is greatest, the weight of the object would be greatest.
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there are two cars, with one being lighter. however, they have the same friction from their tires to the floor. which car has a higher mass acceleration
Higher one car has a higher mass acceleration as the higher mass of car results in less coefficient of friction due to which acceleration is more.
So a lighter car will have a higher coefficient of friction given the exact same tire as a heavier car. With rolling, inertia of the rotating wheel will increase the effective mass of the car and so will reduce the deceleration, thus giving a longer braking distance.
But as you roll, you experience rolling resistance, which increases the brake friction force. Additionally, a rolling tire's coefficient of friction may be significantly higher than a sliding tire's.
A skilled driver may be able to brake with a rolling tyre rather than a sliding tyre in less time due to the difference in size.
If the cars have both comparable tires well suited and sized for their weight, they will both slide the same distance as mass is not a factor with friction.
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find the total energy delivered before the blink reflex shuts the eye.
The total energy delivered before the blink reflex shuts the eye is [tex]$2.5 \times 10^{-4} \mathrm{~J}$[/tex].
What is total energy ?
Total Energy is the sum of all final energy used at a certain branch or variable. Because energy data is recorded directly rather than as the result of an activity level and an energy intensity, total energy may be distinguished from final energy intensity.
The expression for the total energy delivered is given as,
E = Pt
Solving as,
[tex]\begin{aligned}& E=1 \times 10^{-3} \times\left(250 \times 10^{-3}\right) \\& E=2.5 \times 10^{-4} \mathrm{~J}\end{aligned}[/tex]
Thus, the total energy delivered before the blink reflex shuts the eye is [tex]$2.5 \times 10^{-4} \mathrm{~J}$[/tex].
Complete question: Lasers are classified according to the eye-damage danger they pose. Class 2 lasers, including many laser pointers, produce visible light with no greater than 1.0 mW total power. They're relatively safe because the eye's blink reflex limits exposure time to 250 ms.
Find the total energy delivered before the blink reflex shuts the eye.
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Which of the following definitions best describes the concept of work?
(a) the flow of energy from one object or substance to another due to a difference in temperature.
(b) the flow of energy from one body to another through uniform molecular motion.
(c) the force associated with molecular motion.
(d) the random motion of molecules in a gas at low pressure.
(b) the flow of energy from one body to another through uniform molecular motion.
The flow of energy from one body to another through uniform molecular motion. Work is defined as the transfer of energy from one body to another due to a force acting upon the bodies. It is the energy associated with molecular motion, which can be uniform or non-uniform.
Molecular Motion:
The motion of atoms and molecules is described by the laws of motion developed by Isaac Newton. His three most important laws are Law of Inertia. An object at rest or in uniform motion maintains that state unless an external force acts on it.
The law of acceleration that the acceleration of a body is proportional to the force acting on it.
Law of action and reaction. It states that for every action there is an equal and opposite reaction.
Newton's laws of motion also apply to atoms and molecules. Because they are small bodies, they obey the same laws of motion as large bodies.
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what is the acceleration of a falling object that has reached its terminal velocity? group of answer choices the acceleration is g^2. the acceleration is 0. the acceleration is -g. the acceleration is g.
The acceleration of the abject at terminal velocity is zero.
The terminal velocity of an object falling through a fluid is its maximum attainable velocity in the fluid. it is said to occur when the sum of the drag force and the buoyancy is equal to the downward force of gravity acting on the object. At terminal velocity, the object stops accelerating and moves at constant velocity.
When the object has reached its terminal velocity, the gravity which is a downward force is equal to the sum of the buoyancy of the object and the also it drags the force. This makes the acceleration to be zero at terminal velocity.
Therefore, an object at terminal velocity has zero net acceleration.
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what was the hiker's average velocity during part b of the hike? responses 0.6 km/h north 0.6 km/h north 0.17 km/h south 0.17 km/h south 6 km/h south 6 km/h south 10 km/h southeast
The hiker's average velocity during part B of the hike is 6 km/h South.
Given the following data:
Total distance = 6 km, South.
Start time = 9:45 am
Ending time = 10:45 am
To determine hiker's average velocity during part B of the hike:
First of all, we would determine the total time.
Total time = Ending time - starting time
Total time = 10:45 - 9:45
Total time = 1 hour.
Mathematically, the average velocity is given by the formula:
Average velocity = total distance / total time
Substituting the parameters into the formula, we have;
Average velocity = 6/1
Average velocity = 6 km/h South.
Therefore, the average velocity of the biker is 6 km/h South
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a. you launch a 0.5 kg object vertically by putting it on top of a spring which has been compressed by 12 cm and which has a spring constant of 24 kn/m . the object starts with zero initial speed and is not attached to the spring. when the spring expands and fires the object straight up, how high vertically does the object go, relative to its starting point?.
Answer:
A 0.5 kg object is launched vertically when its put on top of a spring that has been compressed by 12 cm. The spring constant is 24 kN/m.
Explanation:
A camel of weight W Newtons has a load of w Newtons on its back. The camel stands on a bridge. Give the force of the bridge on the camel.
The force of the bridge on the camel is given as - (W + w) N.
What is the force of the bridge on the camel?According to Newton's third law of motion, for every force, there is an equal but oppositely-directed force.
The force of gravity acting on the camel produces a downward force that acts perpendicular to the plane of the surface of the bridge.
According to Newton's law of motion, a balancing force acts on the camel in the opposite direction of the weight of the camel. This is the force of the bridge in the camel.
The total downward force acting on the bridge = (W + w) N
The total upward force acting on the camel = - (W + w) N
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open stax an air conditioner uses of energy from work to transfer by heat from a room in a house. a second air conditioner uses of energy from work and transfers by heat. what is the difference in their efficiencies?
Every air conditioner has a preset temperature. If used continously, the temperature goes down the reset temperature and breaks down.
And then it would pump the heat out and a lot of energy would be released
How to describe efficiency of air conditioner?When the air conditioner is mounted inside a room, it only transfers heat within the room. The air conditioner does not change the form of the heat; it only absorbs the heat from inside the room and ejects it outside the room.
According to the second law of thermodynamics, in a closed system, the heat is increasing or remains constant. It never decreases.
So as the air conditioner cools the room, it has to pump the heat out from inside the room.
Every air conditioner has a preset temperature. If used continously, the temperature goes down the reset temperature and breaks down.
And then it would pump the heat out and a lot of energy would be released
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a string is compressed 1.0 cm. how far must you compress a spring with twice the spring constant to store the same amoutn ofe nergy
The spring constant for storing the same amount of energy is given as x = 0.707 cm.
What does a string mean?
A string is a computer data type that is similar to an integer and a floating point unit, except it represents text instead of numbers. It is made up of a series of symbols that may also include spaces and numerals.
briefing :
E = /kx2 is the energy that has been stored.
E1 = E2
1/2 k(1.0)² = 1/2 (2k)x²
x^2 = 1/2 (1.0)²
x = 1.0/√2 cm
x = 0.707 cm
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0.2kg gingerbread man is resting on a table. What is the normal force applied by the table onto the gingerbread man?
The normal force applied by the table onto the gingerbread man is 1.96 N.
What is normal force?
The normal force is a type of force that is felt when a surface pushes against an object that is placed on that surface.
In other words, a normal force is a type of force directed opposite to the weight of an object. The normal force of an object is always directed upwards while the weight of the object is directed downwards.
According to Newton's third law of motion, the magnitude of the normal force of an object acting upwards is always equal to the weight of the object acting downwards.
The normal force applied by the table onto the gingerbread man is calculated as follows;
Fn = mg
where;
m is the massg is acceleration due to gravityFn = 0.2 kg x 9.8 m/s²
Fn = 1.96 N
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Label the arteries of the head and neck. Common carotid a. Axillary a. Brachiocephalic trunk External carotid a. Basilar a. Vertebral a. Internal carotid Occipital a. a. Subclavian a. Facial a. Which structure is highlighted and indicated by the leader line? Multiple Choice
O Right ventricle
O Right atrium
O Left atrium
O Left ventricle
the head and neck. Common carotid is O Right atrium, O Left atrium .
What are the four major arteries?A celiac, mesenteric, renal, & iliac arteries are among these arteries.The iliac also branches into the leg and supplies blood to the pelvis.The femoral artery is the biggest artery in the leg.The blood flow to the upper leg is provided by this artery.
What are the arteries' functions?Away from the heart, arteries transmit oxygen-rich blood to the various regions of the body.A pulmonary artery as well as the systemic artery are the two primary categories of arteries.Blood travels through the pulmonary arteries from the to the lungs, where it absorbs oxygen.
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In which of the following oscillations, amplitude varies with time
a) Free oscillation
b) Damped oscillations
c) Undamped oscillations
d) Resonant oscillation
e) Forced oscillation
The magnitude of the following time-dampened oscillations varies.
What does SHM's damped oscillation mean?
An oscillatory and its velocity are dampened when the oscillator's motion decreases as a result of an external force. These repeating, amplitude-decreasing oscillations are blunted simple harmonic motion.
What does Class 11 damped oscillation mean?
When a moving particle interacts with air resistance like air resistance or friction, the oscillation is known as a damping oscillation. Because of this resistance provided by outside forces, a particle's displacement gradually decreases over time until it eventually reaches its position of rest.
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why are electrical insulators important? they help the flow of electricity they provide power for electric circuits they are used to protect us from electricity they help conduct heat they are not important
Electrical insulators are important because they are used to protect us from electricity.
Why are we use Electrical insulator?As they don't carry electricity, insulators are used in circuits to insulate wire, switches, plugs, and other electrical components. So that circuit may be made safe to touch and shock-free.An insulator prevents electricity from moving. Insulators are crucial for protecting humans from electricity. A rubber-like insulator covers the wire carrying electricity to your computer or television to prevent you from being electrocuted. Glass, the air, and paper are all effective insulators.Electrical equipment uses insulators to hold and separate electrical conductors without allowing current to flow through them. Insulation is an insulating substance that is wrapped in large quantities over electrical lines or other equipment.Learn more about Electrical insulator refer to :
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a circular loop of wire with a radius of 4.0cm is in the uniform magnetic field of magnitude 0.060t. the plane of loop is perpendicular to to the direction of the magnetic field. in a time-interval of 0.50s, the magnetic field changes to the opposite direction with a magnitude of 0.040 t. what is the magnitude of the average emf induced in the loop?
Magnitude of the average emf induced in the loop is 0.20 mV.
Average emf induced in the circular loop is given by;-The magnitude of average emf induced in the loop is calculated as follows are;
emf = NA(B₁ - B₂)/t
by using the formula of the induced emf we calclate the average emf.
A = area of the loop
N =number of turns
B1 = initial magnetic field
B2 = final magnetic field
t=time
A = πr² = π(0.04)²
= 5.027 x 10⁻³ m²
emf = (1)(5.027 x 10⁻³)(0.06 - 0.04)/0.5
emf = 2.01 x 10⁻⁴ V
emf = 0.201 mV
Thus, magnitude of the average emf is induced in the loop = 0.20 mV.
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a bullet is shot into a large lead block and comes to rest (the block remains at rest as the bullet embeds in it). temperature measurement of the block shows that the bullet lost 1,729 j of kinetic energy and motion sensors show that it was moving at 597 m/s just as it hit the block. what is the mass of the bullet in grams?
The mass of the bullet is 9.7 grams.
As total mechanical energy is the sum of all the kinetic as well as potential energy stored in the system.
i.e.ME = KE + PE
As given in the problem bullet is fired into a large stationary absorber and comes to rest. So PE = 0.
Temperature measurements of the absorber show that the bullet lost 1729 J of kinetic energy and high-speed photos of the bullet show that it was moving at 597 m/s just as it struck the absorber.
We know that KE = [tex]\frac{1}{2} mv^{2}[/tex], where
KE = kinetic energy = 1729J
m = mass
v = velocity = 597 m/s
Putting these values in above equation we get, m = 9.7 grams
So, the mass of the bullet is 9.7 grams.
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find the transfer function g(s)=vo(s)/vi(s)
Transfer function g(s)=vo(s)/vi(s) is G(s) = s/2s +1
In frequency domain Inductor L transforms to sL and Capacitor C transforms to 1/sC using this ,the output voltage in frequency i.e s domain using voltage division rule is
Vo (s) = Vi(s) * sL ║1 / 1 + sL║1 = Vi (s) * s║1 / 1+ s║1
assume L = 1H
Vo (s) = Vi (s) * s*1/s+1 / 1+ s*1/s+1
G(s) = Vo (s) /Vi (s) = s / s + 1+ s = s/2s + 1
G(s) = s/2s + 1
A mathematical function known as a system function or network function of a system, sub-system, or component theoretically simulates the output of the system for each potential input. Electronics and control systems use them extensively. This function, which is sometimes called a transfer curve or characteristic curve, is a two-dimensional graph of an independent scalar input vs a dependent scalar output. In electronics and control theory, transfer functions for components are used to build and analyze systems that are constructed from components, particularly when utilizing the block diagram technique.
The transfer function's parameters and units simulate the output response of the device for a variety of potential inputs.
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a mass on a spring oscillates back and forth and completes one cycle in 0.5 sec. its maximum displacement is 3 cm. write an equation that models this motion.
x(t) = 0.03 cos(4t) is the equation that models the motion of the mass on a spring.
When has a spring's maximum displacement for a given mass?The mass is pushed towards the equilibrium position by the force of the spring. Because the mass is shifting direction as it reaches its maximum displacement location, velocity is zero.
The equation: can be used to simulate the motion of a mass on a spring.
x(t) = A cos(2πf t)
A = 0.03 m since the highest displacement is known to be 3 cm. We also know that the oscillation's period is 0.5 seconds, hence the frequency is:
f = 1/T = 1/0.5 = 2 Hz
Substituting the values of A and f in the equation, we get:
x(t) = 0.03 cos(2π × 2 t)
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at which of the first five labeled stages is the star in energy balance?
The star is in energy balance when its core energy production matches the amount of energy it radiates into space. This is only true when the star is a main-sequence star with a hydrogen core fusion and when it is a helium core-fusion star. It is out of energy balance at all other times, which is why it is either contracting or expanding.
Stars can squeeze various types of atomic fuel together, and it's through this process that we get almost every element in the universe. Stars contain a lot of mass which has a lot of gravity. The gravity pulls inwards, which could cause a star to collapse in on itself. In a main sequence star, this inward pull is balanced by the outward gas pressure due to the nuclear fusion reactions deep in the star's core. This balance is called hydrostatic equilibrium and stops the main sequence stars from collapsing.
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