The Lambda-CDM (cold dark matter) model is the most widely accepted model for the structure and evolution of our universe.
What is universe?
Universe is the totality of all existing things, including all matter and energy, the planets, stars, galaxies, and the contents of intergalactic space. It is the physical universe in its entirety and the totality of all phenomena within it, including all matter and energy that has existed, exists, and will exist. The universe is believed to have begun with the Big Bang, an event that marked the beginning of time and space, and from which all matter and energy have since emerged.
This model is based on observations of the cosmic microwave background, large-scale structure, and the expansion of the universe. It suggests that the universe is composed of about 4.9% ordinary matter, 26.8% dark matter, and 68.3% dark energy.
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A piece of stone is projected vertically upwards with a speed of 25ms^-1. Determine it's speed at it's point reached
Assuming a piece of stone is projected vertically upwards with a speed of 25ms^-1, its speed at its highest point reached is equal to zero (0) m/s.
What is projectile motion?In Science, projectile motion can be defined as a form of motion which is experienced by a physical object (body) that is projected near the surface of planet Earth, while moving along a parabolic path, and under the influence of a gravitational force (gravity) only.
Generally speaking, when this stone is thrown straight up or projected vertically upwards at a certain speed, it begins to slow down as a result of the effect of downward gravitational acceleration.
Consequently, the stone reaches a maximum height (highest point) where it cannot go higher anymore and then starts to fall down (descend) due to gravity.
In this context, we can reasonably infer and logically deduce that the speed of any physical object would be equal to zero (0) meter per seconds when it reaches a maximum height (highest point).
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Complete Question:
A piece of stone is projected vertically upwards with a speed of 25 ms^-1. Determine its speed at its highest point reached. (g = 10 ms-2).
what force must be exerted on the master cylinder of a hydraulic lift to support the weight of a 2500 kg car (a big car) resting on the slave cylinder? the master cylinder has a 1.93 cm diameter, while the slave's is 24.9 cm. 1900 n 150 n 15 n 4.1e 06 n 74 n
The force that must be exerted on the master cylinder of the hydraulic lift to support the weight of car is 147.2 N .
The Pascal's Law states that the relation between the pressure , force and area is given as :
Pressure = Force/Area ;
given that the diameter of the master cylinder is = 1.93 cm ;
so radius of master cylinder = 1.93/2 = 0.965 cm = 0.00965 m ;
the diameter of slave cylinder is = 24.9 cm ;
the radius of the slave cylinder = 24.9/2 = 12.45 m = 0.1245 m ;
Area of slave cylinder (A₁)= π(0.1245)² = 0.0486 m²
Area of the master cylinder (A₂) = π(0.00965)² = 0.000292 m² ;
given mass of the car = 2500 Kg ,
the force exerted will be : F = m*a
F₁ = 2500*9.8 = 24500 N ;
F₁/A₁ = F₂/A₂
So , 24500/0.0486 = F₂/0.000292
F₂ = (24500/0.0486)×0.000292
F₂ = 147.2 N
Therefore , the force exerted on the master cylinder is 147.2 N .
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9) During a game of bowling, which of the following describe the ball's motion?(SELECT ALL ANSWERS THAT APPLY)
A) The ball is accelerated while it is pushed by the student's hand due to an
unbalanced force.
B) The ball slows down as it rolls because friction exerts an unbalanced force.
C) The ball is accelerated while it is held in the student's hand due to balanced
Forces.
D) The ball does not change its motion as it rolls because of the balanced force
provided by friction.
E) The ball does not change its motion while it is held in the student's hand due to
balanced forces.
Answer:
The answer seems to be,
A) The ball is accelerated while it is pushed by the student's hand due to an
A) The ball is accelerated while it is pushed by the student's hand due to anunbalanced force.
(The answer might be wrong. )
Mr. Seifert needs to push a cardboard box down the hallway for Ms. Wang. The box has a mass of 40 kg and he is pushing it with an acceleration of 2 m/s/s. Because the cardboard does not slide easily, there is a friction force of 25 Newtons acting on the box to the LEFT. How much force is Mr. Seifert applying to the box to move it forward to the RIGHT?
Answer:
105N
Explanation:
force = mass x acceleration
force without the 25N = 40 x 2
= 80N
On top of this, he has to counteract the 25N so the actual force is 80N + 25N which is 105N
an object completly submerged in water as shown in the figure. draw arrows, which represent the force of the water at that depth, at various locations on the top, bottom, and side of the object. how does the force on one side of the object compare to the force on the other? how does the force on the top compare to taht on the bottom
The downward force here on top of the cylinder is greater than this pressure's equivalent upward force here on bottom of the cylinder.
What is an illustration of pressure?By pressing a knife on some fruit, one can get a straightforward illustration of pressure. The surface won't be cut if you press the flat section of the knife against the fruit. The force is dispersed over a wide area (low pressure).
How many pressure units are there?Other pressure measurements include pounds per square inch, bar, millimeters of mercury (used to measure blood pressure), centimeters of water, torr, MSW, and FSW. Atmospheric pressure is measured in atm.
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the sun has a mass of 2.0 x 1030 kg and radiates energy at the rate of 3.9 x 1026 w. (a) at what rate does the sun transfer its mass to other forms of energy? (b) what fraction of its original mass has the sun lost in this way since it began to burn hydrogen, about 4.5 x 109 y ago?
The rate at which sun transfers its mass to other forms of energy is 4.3* 10⁹ kg/s.
The fraction of its original mass has the sun lost in this way since it began to burn hydrogen, about 4.5 x 109 y ago is 3.1 * 10⁻⁴.
Given that,
Mass of the sun = 2* 10³⁰ kg
Radiation power P = 3.9* 10²⁶ W
The rate of changing mass is P = E/t = (m*c²)/t
Re-arranging the terms, we have,
m/t = P/c² = (3.9* 10²⁶)/(3* 10⁸)² = 4.3* 10⁹ kg/s
Fraction of original mass lost is Δm = m/t * t = (4.3* 10⁹)* (4.5* 10⁹)
⇒ 6.15 * 10²⁶ kg
Fraction of mass lost = Δm/(m + Δm) = (6.15 * 10²⁶)/(2* 10³⁰ + 6.15 * 10²⁶)
⇒ 3.1 * 10⁻⁴
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building a dam to produce hydro-electric power and create water storage is one way to take advantage of a common renewable resource. this produces much less pollution than a coal burning plant. water being let out of the dam also produces a lot of kinetic (movement) energy. however, building dams are not a perfect solution. what is the most likely problem related to dams?
Using the water that is both held in dams and flowing in rivers, hydropower, also known as hydroenergy, is a renewable energy source.
What kind of electricity does a dam generate when it transforms the force of the water into electrical energy?In order to generate electricity, hydroelectric power uses the force of moving water, making it a renewable energy source. Long before you switch on a light at home or at work, the hydroelectric process has already begun.
How do dams generate electricity, or more specifically, how do they transform the energy of moving water into AC power?Water must flow in order to generate power. Kinetic energy is energy that moves. The energy transforms into mechanical (machine) energy as flowing water turns blades in a turbine.
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1. a 1.4 x 103 kg car is westbound at a velocity of 37.0 km/h when it collides with a 2.0 x 103 kg truck northbound at a velocity of 35 km/h. if these two vehicles lock together upon collision, what is the initial velocity of the vehicles after collision? (7.2 m/s 37o w of n) 2. a 6.2 kg object heading north at 3.0 m/s collides with an 8.0 kg object heading west at 3.5 m/s. if these two masses stick together upon collision, what is their velocity after collision? (2.4 m/s 56o w of n) 3. a 4.0 x 104 n truck moving west at a velocity of 8.0 m/s collides with a 3.0x104 n truck heading south at a velocity of 5.0 m/s. if these two vehicles lock together upon impact, what is their velocity?(5.0 m/s 25o s of w)
The velocity of vehicles after the collision is 15.82m/sec if car mass is 1.4 × 10³kg and truck mass is 2×10³kg
We know that we need to conserve the momentum of watermelon in a certain direction. Also,we know that initial momentum of watermelon is zero,it means that according to law of conservation of momentum final momentum should be zero.
We know that momentum =mass × velocity
So,initial momentum of car is =1.4 × 10³kg × 37km/hr
Similarly,,initial momentum of truck=2×10³kg × 35km/hr
Now,it is given that both vehicles lock together,so total mass of both vehicles is =1.4 × 10³kg + 2×10³kg=3.4 ×10³kg
Assume final velocity of both vehicle is v
So,following the law of conservation,we get
=>1.4 × 10³kg × 37 + 2×10³kg × 35 = 3.4 ×10³ ×v
=>51.8 ×10³ + 2×10³=3.4×10³ ×v
=>53.8 ×10³ kg-m/sec = 3.4×10³ ×v
=>v = 53.8/3.4
=>v=15.82m/sec
Hence,final velocity of both vehicle after collision is 15.82m/sec.
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how much time does it take for a student running at an average speed of 5 ms to cover a distance of 2km
It will take the student 400 seconds (or 6 minutes and 40 seconds) to cover a distance of 2km at an average speed of 5 m/s.
It would take a student running at an average speed of 5 ms approximately 400 minutes or 6.67 hours to cover a distance of 2km. This is calculated by dividing the distance (2km) by the speed (5 ms) and multiplying the result by 60 minutes, which gives a total of 400 minutes.
1. Convert the distance from kilometers to meters:
2 km = 2000 m
2. Calculate the time it takes for the student to cover the distance:
Time = Distance / Speed
Time = 2000 m / 5 m/s
Time = 400 s
3. Convert the time from seconds to minutes:
Time = 400 s / 60 s/min
Time = 6.67 min
In addition, when breaking down the time it would take, the student would have to maintain a steady pace in order to cover the 2km in the most efficient manner. This would mean running for 40 minutes at a time, with a 5-minute break in between each 40-minute run, for a total of 8 runs to complete the distance.
It is important for the student to remember to stay safe and hydrated when running for such a long duration. It might be a good idea for the student to have a companion with them to help maintain their pace and provide motivation as well.
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Which has more momentum: a 30 of mass that is stationary or a 0.30 kg mass moving at 1.0 m/s?
Answer:
.30 kg mass moving at 1.0 m/s
Explanation:
Well if the 30 mass isn't moving, then that isn't momentum. But if the .30 kg of mass if moving, then that would be momentum. So the correct answer is .30 kg of mass
Answer:
a 0.30 kg mass moving at 1.0 m/s
Explanation:
p = mv
Momentum is the product of mass and velocity. Since a stationary object has velocity=0, it has momentum=0*mass=0
An object with positive mass and nonzero velocity will always have positive momentum, so we could stop here.
An object with m=0.3kg and v=1m/s has
p = mv = 0.3kg * 1m/s = 0.3kg*m/s
which is more than 0.
9. What is the acceleration when a 63 kg person on rollerblades pushes against a wall with a
force of 34 N?
It is a well-known fact that often applying force does not cause a change in the condition of motion. For instance, even if you use all of your force, a hefty box could not budge at all. Again, attempting to push a wall has no noticeable effect.
What acceleration, rollerblades, pushes against a wall force?Because you pushed against the wall, but the wall pushed back against you with an equal and opposite force, you slide in the opposite direction (away from the wall).
Therefore, There are just two forces at work: friction and gravitation. Yes, the frictional force's magnitude must match the weight. Given that it is parallel to the wall, the friction is in the vertical direction (which is vertical)
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fill in the blanks
8) Kinetic energy is the energy of ________.
9)The potential energy of an object depends on its ________ and its height.
10) The law of ________ of energy states that energy can be neither created nor destroyed, but it can change its form.
Answer: Kinetic energy is the energy an object has because of its motion
(if it needs to be a one worded answer than just type motion)
The potential energy of an object depends on its mass and its height.
The law of conservation of energy states that energy can be neither created nor destroyed, but it can change its form.
Answer:Kinetic energy is the energy an object has because of its motion. If we want to accelerate an object, then we must apply a force. Applying a force requires us to do work.
As expressed by the equation, potential energy depends upon the mass and the height of the object. Any increase in these two quantities will lead to an increase in the amount of potential energy possessed by the object.
The law of conservation of energy states that energy can neither be created nor destroyed - only converted from one form of energy to another. This means that a system always has the same amount of energy, unless it's added from the outside.
A motorcycle initially travelling at 15.0 m/s comes to rest in 5.0 s. What is its deceleration and how
far does it travel during deceleration?
The deceleration of the motorcycle is -3.0 m/s^2 and it travels 75.0 m during deceleration.
To find the deceleration of the motorcycle, we can use the formula:
deceleration = (final velocity - initial velocity) / time
Plugging in the given values, we get:
deceleration = (0 m/s - 15.0 m/s) / 5.0 s = -3.0 m/s^2
To find the distance the motorcycle travels during deceleration, we can use the formula:
distance = (initial velocity * time) + (1/2 * deceleration * time^2)
Plugging in the given values, we get:
distance = (15.0 m/s * 5.0 s) + (1/2 * -3.0 m/s^2 * 5.0 s^2) = 75.0 m
So the deceleration of the motorcycle is -3.0 m/s^2 and it travels 75.0 m during deceleration.
a car is stopped at a traffic signal. when the light turns green, the car accelerates from 0 to 4.1 m/s in 0.526 seconds. what is the average force in n (newtons) experienced by a passenger of mass 81.9 kg in the car when the car accelerates?
Car acceleration is 7.794 m/s2 and the average force F is 638.32 N.
Because the passenger is in the car, the passenger experiences the same velocity and acceleration as the car.
Linear impulse equals mass times a change in speed (Vf - Vi)
Initial velocity is Vi, whereas ultimate velocity is Vf.
When the passenger's mass,
m(mass), is 81.9 kg,
the linear impulse is 81.9 kg ×(4.1 - 0)
= 335 kgm/s.
F(average) = m × acceleration
Acceleration = Vf - Vi/ t
Acceleration= 4.1 - 0 ÷0.526
Acceleration= 7.794 m/s²
F(average) = 81.9 kg × 7.794 m/s²
F = 638.32 N
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The diagram below represents a wave.
What is the speed of the wave if its wavelength is 3.0 m?
The speed of the wave is determined as 18 m/s.
option D is the correct answer.
What is the speed of the wave?
The speed of the wave is the rate of change of wave's displacement with time.
The speed of the wave is calculated by applying the formula relating speed, wavelength and frequency of the wave as shown below.
v = fλ
where;
v is the speed of the wavef is the frequency of the waveλ is the wavelength of the waveThe frequency of the wave is calculated as follows;
f = 1 / T
where;
T is the period of the waveThe period of a wave is the time taken for the wave to complete one cycle.
In the picture given, 3 cycles of the wave = 0.5 s
1 cycle of the wave = ?
= 0.5 s / 3
= 0.16667 s
f = 1 / T
f = 1 / 0.16667
f = 6 Hz
The speed of the wave is calculated as follows;
v = fλ
v = 6 Hz x 3 m
v = 18 m/s
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7. What is the weight of a ball with a mass of 0.77 kg? (hint: how fast is gravity?)
Answer:
While on the earth, any object with a mass of 0.77 kg weighs 7.546 newtons (1.698 pounds).
On the moon, the same 0.77-kg object would weigh 1.232 newtons (0.277 pound)
Explanation:
TRUE/FALSE
1) A test booklet is sitting at rest on a desk. Compared to the force of the booklet on the
desk, the force of the desk on the booklet is the same. _______________
True
False
2) The acceleration of an object is always in the direction of the net force acting on it.
True
False
Answer:
TRUE - A test booklet is sitting at rest on a desk. Compared to the force of the booklet on the desk, the force of the desk on the booklet is the same.
TRUE - The acceleration of an object is always in the direction of the net force acting on it.
9. a soap bubble is 100 nm thick and illuminated by white light incident perpendicular to its surface. what wavelength and color of visible light is most constructively reflected, assuming the same index of refraction as water?
When a soap bubble 100 nm thick and illuminated by white light incident perpendicular to its surface, then wavelength, λ is calculated = 5.32 *10^-7 m.
What is index of refraction?The ratio of the speed of light in a vacuum, c, to the speed of light in a medium, c' is called as index of refraction. One of the consequence of this difference in speed is that when light goes from one medium to another at an angle, then the propagation vector in the new medium has a different angle with respect to normal.
Given, t= 100nm= 100 * 10 ^-9 n= 1.33
ΔФ1 = λ/4
ΔФ2 = 2√2 t λ n/2 λ
=2 t n
=2 * 100 * 10 ^-9 * 1.33
= 2.66 *10^-7
2.66 *10^-7= λ/2
λ= 5.32 *10^-7 m.
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On an ECG machine that meets the international standard, the paper moves at ________.
a. 25 mm/second
b. 10 mm/second
c. 25 mm/minute
d. 10 cm/minute
On an ECG machine that meets the international standard, the paper moves at 25 mm/second.
it’s actually 7th grade science no physics pls answer it’s a lot of points
What do the historical communication technologies in these photos have in common?
(pictures are shown below)
All the tools of communication such as the drum, telegraph et cetra were used for emergency communication.
What is communication?We know that communication has to do with the art of sending and receiving information between two people who may or may not be at the same place. We know that the dissemination of information is a very important aspect of life and we have always tried to invent means of communication especially at times when we have an emergency situation that needs a kind of an immediate remedy.
We can see that all the kinds of communication gadgets that have been show here are all from a period that is far behind the kind of civilization that we have to day and the kind of thge communication gadgets that are quite available to the people that are around today.
However, all the tools shown could be used to send information in times of emergency.
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I NEED HELP ASAP PLSS
Answer:
C.) The United States would become less dependent on energies that emit greenhouse gases.
Explanation:
If nuclear energy increased, it would occupy a larger piece of the pie chart. The prompt states that the usage of non-fossil fuel-based forms of energy would remain constant. This condition means that nuclear energy would decrease the percentage of fossil fuel-based energy used. Energy production through the use of fossil fuels necessarily produces greenhouse gases such as CO2. An increase in nuclear energy would mean a corresponding decrease in dependence on greenhouse gas-producing fossil fuels.
what is the change in internal energy of a system that takes in 4.23 106 j of heat, and does 4.50 105 j of work while dissipating 9.07 106 j of heat?
The change in internal energy of a system is - 5290×10⁴J.
What do you mean by internal energy?Innate strength A system's or a body's (with clearly defined boundaries) U is made up of the sum of the kinetic and potential energies resulting from molecular motion as well as the electric and vibrational motion of the atoms within molecules.
Heat transfer into the system Q₁ = 4.23×10⁶J
Heat transfer out of the system Q₂ = 9.07× 10⁶J
Work done W = 4.50×10⁵J
The heat transfer into the system less the heat transfer out of the system is now known as the net heat transfer.
Q = Q₁ - Q₂
Q = 4.23×10⁶ - 9.07× 10⁶
Q = -4.84× 10⁶J
The first law of thermodynamics provides the following formula for the change in internal energy:
ΔU = Q - W
ΔU = -4.84× 10⁶ - 4.50×10⁵
ΔU = - 5290×10⁴J.
A negative sign indicates a decrease in internal energy.
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1) When there is friction between surfaces, energy is transferred out of a system as ________
energy.
Answer:
heat energy
Explanation:
heat energy
calculate the height of the coulomb barrier for the head-on collision of two deuterons. take the effective radius of a deuteron to be 2.1 fm.
The nuclear force between two charged particles is attractive, but Coulomb repulsion prevents two charged particles from getting close enough to interact. (K= 170 keV.)
How to fix it?We consider the value of the initial kinetic energy K that each deuteron must possess in order for them to come to rest when their surfaces meet to be the height of the Coulomb barrier.
if r is a deuteron's radius, then by the law of conservation of energy, we get,
2K=1/4πϵo. e²/2r
putting values, we get
K= 1/4πϵo. e²/4r=9x10^9x1.6x10^-19/4x2.1x10^-15=2.75x10^-14 J = 170 keV.
How can the height of a potential barrier be determined?J is the potential energy. Divide it by the electron charge, or 1.6 x 1019C, to convert it to eV. Consequently, the 360keV potential barrier height for a head-on collision of two deuterons. In this work,
What is the calculation for height?5 feet, 6 inches, or 66 inches, is the height of a human. 2.54 centimeters make up one inch (cm). Therefore, to convert your height from inches to centimeters, just multiply it by 2.54. The metric equivalent of a person who is 5 feet, 6 inches tall in this instance is 167.64 cm (66 x 2.54).
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a small ferryboat is 4.70 m wide and 6.50 m long. when a loaded truck pulls onto it, the boat sinks an additional 3.70 cm into the river. what is the weight of the truck?
According to the given statement 11303.5 kg is the weight of the truck.
What does physics' Archimedes principle entail?The buoyant force, which applies to a person at rest in a fluid, is proportional to the weight of the displaced water and pushes higher. The amount of fluid displaced when the body is fully immersed is equal to the body's volume.
Briefing:The Archimedean principle, which asserts that the hydrostatic push is equal to the weight of the desalinated liquid, is used to solve this task.
B = ρ g V
It is in balance with the push when the truck is at full weight, according to Newton's law of equilibrium.
Σ F = 0
B-W = 0
B = W
body weight
W = M g
the volume is
V = l to h
(l to h) = M g
M = l a h
we calculate
M = F = 1000 . 10. (4.70 x 6.50 x 0.037) = 11303.5 N
M = 11303.5 kg
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Two aircraft p and q are flying at the ame peed,300 m the direction along which p i flying i at right angle to the direction along which p i flying ,find the direction of velocity
The magnitude of the velocity of the aircraft P relative to aircraft Q is zero
The velocity of the two aircraft given is
P & Q, v = 300 m/s
The angle of the direction between P&Q is
Ф = 90°
The magnitude of the velocity of aircraft P relative to aircraft Q is given by the formula which is as follows:
V = v cos Ф
Substituting the values in the above equation
v = 300 x cos 90°
= 300 x 0
= 0
Since the aircraft are at right angles, the velocity of one aircraft relative to the other would be equal to zero.
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The aircraft has a take-off mass of 320 000 kg. Each of the 4 engines can produce
a maximum force of 240 kN.
Calculate the maximum acceleration of the aircraft.
Show clearly how you work out your answer and give the unit.
Acceleration =
Answer: maximum acceleration of an aircraft is 3 m/s².
Explanation:
1 kN = 1000 N
240 kN = {240 * 1000} N
⟹ 240000 N
four engine force = 4 * 240000 ⟹ 960000 N
GIVEN:
Mass of aircraft = 320000 kg
Force produce by four engine = 96000
FORMULA: (F = M * A ) force = mass * acceleration
960000 = 320000 * a
a = 960000/320000
a= 96/32
a=3 m/s²
The speed of light in a certain glass is 1.91×10^8 meter per second. What is the refractive index of the glass?
Answer: 1.57
Explanation:
absolute refractive index = [tex]\frac{speed of light in air}{speed of light in a medium}[/tex]
[tex]= > \frac{3 * 10^{8} }{1.91* 10^{8} } \\= > 1.57[/tex]
(a) what is the magnitude of the tangential acceleration of a bug on the rim of an 11.0-in.-diameter disk if the disk accelerates uniformly from rest to an angular speed of 79.0 rev/min in 3.50 s?
The magnitude of the tangential acceleration is 0.329m/s².
The degree of tangential acceleration can be calculated in what way?At=r a t = r is the formula for tangential acceleration, where r is the circle's radius and is the angular acceleration. The definition is derived from the fact that the arc length is equal to the circle's radius times the angle in radians.
d = Diameter of rim = 11.0 in = 11 × 0.0254 = 0.2794m
r = Radius = d/2 = 0.2794/2 = 0.1397m
[tex]\omega_{f}[/tex] = Final angular velocity = 79 × 2π/60 = 8.26rad/s
[tex]\omega_{i}[/tex] = Initial angular velocity = 0
∝ = Angular acceleration
t = Time taken = 3.5s
Rotational motion equation,
[tex]\omega_{f}[/tex] = [tex]\omega_{i}[/tex] + ∝t
∝ = [tex]\omega_{f}[/tex] - [tex]\omega_{i}[/tex]/t
∝ = 8.26 - 0/3.5
∝ = 2.36 rad/s²
Magnitude of the tangential acceleration given by
[tex]a_{t}[/tex] = r∝
[tex]a_{t}[/tex] = 2.36 × 0.1397
[tex]a_{t}[/tex] = 0.329m/s².
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one cannot peer all the way back and directly observe the big bang because the universe's density was so low. true false
True. The Big Bang Theory is the current scientific explanation for the origin and evolution of the universe. According to this theory, the universe was initially in a state of extremely high density and temperature, and it has been expanding and cooling since its inception.
One reason we cannot directly observe the Big Bang is that the universe's density was so low at that time that there were no solid particles, such as atoms or molecules, that could have formed into stars or galaxies. Instead, the universe was filled with a hot, ionized plasma that was too diffuse to be observed by telescopes. Another reason is that the expansion of the universe has caused the light and other electromagnetic radiation that was emitted during the Big Bang to become redshifted, or stretched out in wavelength, over time. This means that the light from the earliest moments of the universe has shifted into the microwave and radio frequency ranges, which are not visible to the human eye. Therefore, while we can infer some details about the conditions of the early universe based on observations of the cosmic microwave background radiation and the large-scale structure of the universe, we cannot directly observe the Big Bang itself.
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