How does cosmic inflation of the early Universe solve the flatness problem?
Answers
Cosmic inflation is a theory that explains the large-scale structure of the universe and its overall homogeneity. It is believed that the universe underwent a period of rapid expansion just after the Big Bang, which is known as cosmic inflation. This period of expansion solved many of the problems that were present in the standard Big Bang model.
One of the problems that cosmic inflation solved was the flatness problem. The flatness problem refers to the observation that the universe appears to be very close to flat, meaning that it has a curvature close to zero. This is in contrast to what we would expect from the standard Big Bang model, which predicts that the universe would either be highly curved or highly open.
Cosmic inflation solved the flatness problem by causing the universe to expand so rapidly that any curvature that was present in the early universe was stretched out to an almost flat state. This means that the curvature of the universe today is very close to zero, which is consistent with observations.
Overall, cosmic inflation is an important theory in modern cosmology because it explains many of the observations that we have made about the universe, including the flatness problem.
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Related Questions
I rode my bicycle to grandmother's house at 6 km/h in a flat road for 5 min before reach a hill. I went at 2 km/h up the hill for 3minutes. I met a friend and stopped to talk for 5 minutes. I went on at 2 km/h to my grandmother's house. Draw (plot) the v against t graph for this motion.
Answers
The graph can be plotted based on the given information which are given
in pairs (velocity and time), and which the coordinate pairs are formed.
Please find attached the required v against t graph created with MS ExcelReasons:
The given data are presented in a tabular form as follows;
\(\begin{tabular}{|c|c|c}\underline{Duration (Minutes)} & \underline{Speed (km/h)}\\0 - 5 &6 \\5 - 8&2\\8 -13&0&\\13- &2&\end{array}\)
The velocity time graph can be plotted using the above table values on
MS Excel using the above table elaborated as follows;
\(\begin{tabular}{|c|c|c}\underline{Duration (Minutes)} & \underline{Speed (km/h)}\\0 &6 \\5&6\\5 &2\\8&2\\8&0\\13&0&\\13 &2&\end{array}\)
The attached graph can then be created using the Insert → Chart menu
after selecting the data above inputted in the spreadsheet button on MS
Excel.
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When humans pollute lakes, rivers, and streams,
Answers
Answer:
when waterways are polluted it affects all forms of life in the area - including us
expression:
for example when Lakes streams and ponds are polluted it can kill or harsh fish and other Wildlife that lives there!
hope that helps !
4. Going back to the dog whistle in question 1, what is the minimum riding speed needed to be able to hear the whistle? Remember, you can assume the following things: The whistle you use to call your hunting dog has a frequency of 21.0 kHz, but your dog is ignoring it. You suspect the whistle may not be working, but you can't hear sounds above 20.0 kHz. The speed of sound is 330 m/s at the current air temperature.
Answers
Answer:
The minimum riding speed relative to the whistle (stationary) to be able to hear the sound at 21.0 kHz frequency is 15.7 m/s
Explanation:
The Doppler shift equation is given as follows;
\(f' = \dfrac{v - v_o}{v + v_s} \times f\)
Where:
f' = Required observed frequency = 20.0 kHz
f = Real frequency = 21.0 kHz
v = Sound wave velocity = 330 m/s
\(v_o\) = Observer velocity = X m/s
\(v_s\) = Source velocity = 0 m/s (Assuming the source is stationary)
Which gives;
\(20 = \dfrac{330- v_o}{330+0} \times 21\)
330 - \(v_o\) = (20/21)*330
\(v_o\) = 330 - (20/21)*330 = 15.7 m/s
The minimum riding speed relative to the whistle (stationary) to be able to hear the sound at 21.0 kHz frequency = 15.7 m/s.
Scientist in a lab are working with2 different types of mercury they know the different samples are different isotopes which propeetybof the isotopes must be different
Answers
Answer:
The atomic weight
Explanation:
The property of isotopes that must be different is the atomic weight.
Isotopes are generally referred to as atoms of the same element with the same atomic number (proton number) but different neutron numbers.
Since the atomic weight of an atom is the sum of proton and neutron, atomsof the same element with different number of neutrons will definitely have different atomic weight.
How does the athlete, in your sport, control their speed?
Answers
Answer:
What separates athletes from their competitors is the word itself, separation — gaining it on the offensive side, or taking it away on the defensive side (There are exceptions of course, one being the contest of offensive linemen and defensive linemen in football where the inverse is true). Speed, strength, and power are great ways to create separation in sports. However, speed, strength, and power all have genetic ceilings
a support crossbeam on a high speed train is made from a titanium rod that has a length of 1.25 m when measured by an observer on the train. the beam is positioned such that the observer on the train measures an angle of 27 degrees between the crossbeam and the floor of the train. (figure 1) at what speed u would the train have to be traveling in order for an observer standing outside the train to measure the angle as 83 degrees ? in the figure, s indicates the reference frame of the observer standing outside the train and s' indicates the reference frame of the observer on the train.
Answers
0.765 m/s is speed u would the train have to be traveling in order for an observer .
R=1.25
Sinθ=27
speed=sinθ/r
speed=sin27/1.25
speed=0.765 m/s
A scalar variable called speed can be used to express how much the location of an object shifts over time or how much it shifts per unit of time. It is often shortened to "s." The average speed of an object over a period of time is equal to the distance traveled by the object divided by the length of the period.
Time divided by distance is the speed-related metric. While the SI unit of speed is the meter per second (m/s), the most common unit in daily life is the kilometer per hour (kph).
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A 1-kg block starts sliding up a 30o inclined plane with an initial velocity of 4.00 m/s. How far will the block travel before coming to rest, if the surface is rough and the coefficient of kinetic friction between the block and the ramp is 0.2.
Answers
The block will travel 2.038 m before stopping. Newton's third equation of motion is applied in the given problem.
What is the friction force?It is a type of opposition force acting on the surface of the body that tries to oppose the motion of the body. its unit is Newton (N).
it is defined as the product of the coefficient of friction and normal reaction.
On resolving the given force and acceleration. Mathematically in the different components and balancing the equation gets.Components in the x-direction.
From Newton's third equation of motion;
v²=u²+2as
0 =u²+2(-a)s
u²=2as
u²=2×(2×μg)s
4.00 m/sec = √2×(2 ×0.2 ×9.81 s
16 = 7.848 s
s = 2.038 m
Hence, the block will travel 2.038 m before stopping.
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Which of the following bonds strength ranks in the correct order?
A. S-S < K-K < K-S
B. Mg-Mg < O-O < Mg-O
C. H-H < Ca-H < Ca-Ca
D. Na-Na < Na-Br < Br-Br
Answers
Answer:
the answer is A
Explanation:
The answer is A
The Choice in which the bond Strength ranks in the correct order is Choice A; S-S < K-K < K-S
According to the question;
We are required to determine in which choice Bond strength ranks in the correct order.The bond strength of a bond increases with increasing polarity of the bond.
Evidently, From the options above; In Choice A;
The polarity of S-S < K-K < K-S
As such, the bond strength which ranks in the correct order is Choice A: S-S < K-K < K-S
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The rate of increase of the Earth's gravity field at latitudes 30° and 60° are in the ratio
Answers
Answer:
1 : 2 (30 : 60)
Explanation:
The rate of increase of the Earth's gravity field at latitudes 30° and 60° are in the ratio 1 : 2 because 30 : 60 simplified is 1 : 2.
If the answer does not ask for the ratio to be simplified leave its as 30 : 60.
Which of the following is NOT among the three most anthropogenic sources of greenhouse gas emissions?
A.Industry
B.Transportation
C.Foresty
D. Energy
Answers
Among the options given, "Forestry" is not considered one of the three most anthropogenic sources of greenhouse gas emissions. The correct answer is C. Forestry.
Greenhouse gas emissions refer to the release of gases into the atmosphere that contribute to the greenhouse effect and global warming. While all of the options mentioned - Industry, Transportation, and Energy - are major anthropogenic sources of greenhouse gas emissions, "Forestry" is not typically included among them.
The three primary sources of greenhouse gas emissions are generally recognized as Industry, Transportation, and Energy.
1. Industry: Industrial activities, such as manufacturing, construction, and chemical production, can release significant amounts of greenhouse gases into the atmosphere. These emissions are often associated with the burning of fossil fuels for energy, as well as industrial processes that produce emissions as byproducts.
2. Transportation: The transportation sector, including cars, trucks, airplanes, ships, and trains, is a significant contributor to greenhouse gas emissions. The combustion of fossil fuels in vehicles releases carbon dioxide (CO2) and other greenhouse gases into the atmosphere.
3. Energy: The energy sector, particularly the burning of fossil fuels for electricity generation, is a major source of greenhouse gas emissions. Power plants that rely on coal, oil, and natural gas release CO2 and other greenhouse gases when these fuels are burned.
While forestry can have an impact on the carbon cycle and the sequestration of carbon dioxide through deforestation and forest degradation, it is not typically included among the three most anthropogenic sources of greenhouse gas emissions.
However, it is important to note that land-use changes associated with deforestation can contribute to greenhouse gas emissions indirectly.
In conclusion, among the options provided, "Forestry" is not considered one of the three most anthropogenic sources of greenhouse gas emissions. The primary sources are Industry, Transportation, and Energy.
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Q: You're playing a game of catch with a dog, the dog is initially standing near your feet. Then he jogs 20ft in a straight line to retrieve the stick and carries the stick 15ft back towards you before lying on the ground to chew the stick.
A). Cal the total distance
B) . Total displacement
C). Show that the net displacement of the trip is the sum of the sequential displacement that makes up the trip.
Answers
Answer:
A) 35 ft
B) 5 ft
C) Net displacement = distance covered by the dog to retrieve the stick - distance covered before the dog starts chewing the stick
Explanation:
A) Total distance covered by the dog = 20 + 15
= 35 ft
B) Since the other distance covered by the dog before chewing the stick, after the retrieval, was in an opposite direction to the initial direction, then;
total displacement of the dog = 20 - 15
= 5 ft
C) Net displacement = distance covered by the dog to retrieve the stick + distance covered before the dog starts chewing the stick
But, displacement involves a specified direction. The distance covered before the dog starts chewing the stick was in an opposite direction to the initial direction.
Thus,
Net displacement = distance covered by the dog to retrieve the stick - distance covered before the dog starts chewing the stick
Dark
matter
universe would have;
is the only explanation for the structures of the earty universe. Clumps of it led to
::formation of galaxies
remained uniform
:: matter :: collapsed inward
:: energy
in the early universe Without the
Answers
Dark matter universe would have the only explanation for the structures of the early universe.
What is dark matter?Dark matter does not interact with the electromagnetic force like normal matter does. This makes it incredibly difficult to identify because it does not absorb, reflect, or emit light. In reality, scientists have been able to conclude that dark matter exists primarily based on the gravitational pull it appears to have on visible stuff.
Massive gas clouds that collapse and rotate are the starting point for galaxies. Stars develop within them as they develop. The collision of entire galaxies can alter their appearance. When we look far into space, we can observe galaxies at early stages of their evolution.
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8. An electrical resistor immersed in a liquid produces 65.0 W of electrical energy for 120
specific heat capacity of the liquid in this temperature range. Assume that negligible h
O
O
O
2.51 x 10³ J/(kg. C°)
1.67 x 106 J/(kg C°)
2.02 x 104 J/(kg. C°)
Answers
The specific heat capacity of the liquid is 2.51 x 10³ J/kg⁰C.
Specific heat capacity of the liquidThe specific heat capacity of the liquid is calculated as follows;
Q = mcΔФ
where;
Q is quantity of heat c is specific heat capacitym is mass of the liquidΔФ is change in temperature = 22.54 - 18.55 = 3.99 ⁰Cc = Q/mΔФ
c = (65 x 120)/(0.78 x 3.99)
c = 2.51 x 10³ J/kg⁰C
The complete question is below:
An electrical resistor immersed in a liquid produces 65.0 W of electrical energy for 120 s. The mass of the liquid is 0.780 kg and its temperature increases from 18.55°C to 22.54°C. a) Find the average specific heat capacity of the liquid in this temperature range.
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Alkaline earth metals have a low density
true
false
Answers
true
Explanation:
this is because melting point and boiling point decreases down the group because they are held together by attractions between positive nuclei and delocalised electrons
A gun recoils while fireing a bullet?give reason!!
Answers
Answer: When a bullet is fired from a gun, the gun gives off a force on the bullet in the forward direction. The force is called the action force. The bullet also gives an equal and opposite force on the gun in the backward direction. That's why when bullets fire out, the force from the bullet also creates a force back.
When reading, what should you look for first?
a.
The answers to the teacher’s questions
c.
The answers to the study guide’s questions
b.
The answers to your own questions
d.
The answer’s to the chapter’s questions
Answers
Answer: B
Explanation:
Hopes this helps!!
Answer:
B
Explanation:
an accurate sketch of jupiter's orbit around the sun would show
Answers
An accurate sketch of Jupiter's orbit around the Sun would show an elliptical shape, with the Sun located at one of the two foci of the ellipse.
The distance between Jupiter and the Sun varies as Jupiter moves along its orbit, with the closest point (perihelion) being approximately 741 million kilometers and the farthest point (aphelion) being approximately 817 million kilometers. Jupiter's orbit is also tilted at an angle of approximately 1.3 degrees relative to the plane of the ecliptic, which is the plane of Earth's orbit around the Sun.
Jupiter's orbit is also tilted slightly with respect to the plane of the ecliptic, which is the plane that the Earth's orbit around the Sun lies in. This means that Jupiter's orbit is inclined at an angle of approximately 1.3 degrees to the ecliptic plane.
Jupiter's orbit is relatively large compared to the other planets in the solar system, with an average distance from the Sun of approximately 778 million kilometers (484 million miles). It takes Jupiter about 11.86 Earth years to complete one orbit around the Sun.
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A 1,075 N sky diver has opened his parachute to slow his descent to a constant
speed the parachute applies 1,469 N of force. What deceleration does he
experiences?
Answers
The deceleration experienced by the 1075 N sky diver as he opened his parachute is 13.39 m/s²
How to determine the decelerationForce = mass × acceleration
We know that deceleration is the acceleration of stopping objects. Thus,
Force (F) = mass (m) × deceleration (a)
Thus, we can obtain the deceleration of the sky diver as follow:
Weight of diver (W) = 1075 NForce (F) = 1469 NAcceleration due to gravity (g) = 9.8 m/s²Mass of diver = W / g = 1075 / 9.8 = 109.69 KgDeceleration (a) =?Force = mass (m) × deceleration (a)
1469 = 109.69 × a
Divide both sides by 109.69
a = 1469 / 109.69
a = 13.39 m/s²
Thus, the deceleration is 13.39 m/s²
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The rotor of an electric motor has an angular velocity of 3600 rpm when the load and power are cut off. the 125-lb rotor, which has a centroidal radius of gyration of 9 in., then coasts to rest. knowing that kinetic friction results in a couple of magnitude 2.5 lb·ft exerted on the rotor, determine the number of revolutions that the rotor executes before coming to rest. (round the final answer to its nearest whole number.)
Answers
Answer:
θ '= 4975 rev
Explanation:
For this exercise let's use the relationship between work and the change in kinetic energy
W = ΔK
the expression for work is
W = - τ Δθ
where the negative sign indicates that the torque is in the opposite direction to rotation
kinetic energy
K = ½ I w²
we substitute
- τ Δθ = 0 - ½ I w²
θ = \(\frac{1}{2} \ \frac{I w^2}{\tau}\)
if we approach the rotor to a cylinder with an axis of rotation through its center
I = ½ m r²
we substitute
θ = ½ (½ m r²) \(\frac{w^2}{\tau}\)
How the measurements are in the English system, the weight
W = m g
m = W / g
let's reduce to the english system
w = 3600 rev / min (2pi rad / 1rev) (1 min / 60s) = 376.99 rad / s
r = 9 in (1 ft / 12in) = 0.75 ft
let's calculate
m = 125/32 = 3.91 slug
θ = ¼ 3.91 0.75² 376.99² / 2.5
θ = 3.126 10⁴ rad
let's reduce to revolutions
θ’= 3.126 10⁴ rad (1rev / 2π rad)
θ’= 4974.9 rev
θ '= 4975 rev
Among the reasons for the frequent use of composite measures is(are) that:
a. the researcher is seldom able to develop in advance single indicators of complex concepts.
b. a single data item might not have enough categories to provide a range of variation.
c. composite measures give a more comprehensive and accurate indication of a given variable.
d. they are efficient data reduction devices.
e. all of these choices.
Answers
Among the reasons for the frequent use of composite measures is that they give a more comprehensive and accurate indication of a given variable. Besides, the researcher is seldom able to develop in advance single indicators of complex concepts. A single data item might not have enough categories to provide a range of variation. And lastly, they are efficient data reduction devices.
So, the correct answer is option (e) all of these choices.
What are composite measures?Composite measures are used to combine several variables or scores into a single measurement or index. In other words, they are multidimensional measurement tools. It is useful to make this kind of index because it is possible to calculate the reliability and validity of composite measures, which are statistical measures that indicate whether or not the measurements were conducted accurately or are otherwise legitimate.
For example, if a researcher wants to assess the economic development of a country, he/she could create a composite measure by combining data on GDP per capita, literacy rates, and poverty rates. In this case, each of the three variables reflects a different aspect of economic development.
So, the correct answer is E.
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Identify and explain which ball most likely had the greatest speed.
Answers
a sign with a mass of 180 g is supporteeed by two vertical strings. one is at the end and another
Answers
To support a sign with a mass of 180 g using two vertical strings, you need to ensure that the tension in each string can hold up half of the total weight of the sign.
Since the mass of the sign is 180 g, you first need to calculate its weight (W) using the formula W = mg, where m is the mass and g is the acceleration due to gravity (approximately 9.8 m/s²). Convert the mass to kilograms (0.18 kg) and then calculate the weight:
W = 0.18 kg × 9.8 m/s²
W = 1.764 N (Newtons)
Now, divide the total weight by 2 to find the tension (T) required in each string:
T = 1.764 N / 2
T = 0.882 N
So, each vertical string needs to support a tension of 0.882 N to hold the sign up.
To support a 180 g sign using two vertical strings, the tension in each string should be 0.882 N. This ensures that the sign is evenly supported and remains in equilibrium.
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If a bug with a mass of 5 grams flies into the windshield of a moving 1000 kg bus, which will have the most force?
A. The bug on the bus
B. The bus on the bug
Answers
Both will have equal forces because the force exerted on the bus will be equal to the force experienced by the bug.
Newton's third law of motionNewton's third law of motion states that action and reaction are equal and opposite.
This implies that, the force exerted on an object is equal to the reaction experienced by the object.
Fa = -Fb
The force exerted on the bus will be equal to the force experienced by the bug.
Thus, both will have equal forces.
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Can a rock take only one path through the rock cycle?
Answers
What is always true about the total amount of oxygen and carbon dioxide in the test tube?
Answers
I will give BRAINLIEST.... ln the diagram below the system is in equilibrium. Determine the value of F1 in Newton
Answers
Answer:
35N
Explanation:
if its balanced both sides would have equal forces. Left side is 35N and right side is 70N. 70-35=35N
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a 0.200-a current is charging a capacitor that has circular plates 10.0 cm in radius. if the plate separation is 4.00 mm, (a) what is the time rate of increase of electric field between the plates? (b) what is the magnetic field between the plates 5.00 cm from the center?
Answers
(a) Time rate of increase of electric field = 0.8 V/s
(b) Magnetic field between the plates at 5.00 cm from the center = 1 x 10^{-9}T
(a) The time rate of increase of electric field between the plates can be found by dividing the current (I) by the capacitance (C) of the capacitor. First, find the capacitance using the formula C = ε₀A/d, where ε₀ is the vacuum permittivity (8.85 x 10^{-12} F/m), A is the area of the plates, and d is the plate separation. Calculate A as πr², where r is the radius of the plates. Then, divide the current by the capacitance to find the time rate of increase of the electric field.
(b) The magnetic field between the plates can be calculated using Ampere's Law. The formula is B = μ₀I/(2πr), where μ₀ is the permeability of free space (4π x 10^{-7} T·m/A), I is current, and r is the distance from the center. Plug in the given values to find the magnetic field at 5.00 cm from the center.
Calculation steps:
1. Calculate A: A = π(0.1 m)² = 0.0314 m²
2. Calculate C: C = (8.85 x 10^-12 F/m)(0.0314 m²)/(0.004 m) = 6.91 x 10^{-11} F
3. Calculate the time rate of increase of electric field: E = I/C = (0.2 A)/(6.91 x 10^{-11}F) = 0.8 V/s
4. Calculate magnetic field: B = (4π x 10^{-7}T·m/A)(0.2 A)/(2π(0.05 m)) = 1 x 10^{-9}T
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HELP found the missing number and what type of decay is the equation
Answers
The missing number is 225 and the decay is the beta decay in the given reaction.
What is Beta decay?In nuclear physics, beta decay can be described as a type of radioactive decay in which a beta particle is emitted from an atomic nucleus, transforming the original nuclide. Beta decay of a neutron transforms a nuclide into a proton by the emission of an electron accompanied by an antineutrino.
The two types of beta decay are known. In beta minus (β⁻) decay, a neutron is transformed to a proton, and the process forms an electron and an electron antineutrino; while in beta plus (β⁺) decay, a proton is transformed to a neutron and the process forms a positron and an electron neutrino and β+ decay is called positron emission
\(^{225}Ra_{88} \longrightarrow ^0e_{-1} + ^{225}Ra_{87}\)
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What is the temperature in °F and the pressure in Pa at the triple point of (a) water and (b) carbon dioxide?
Answers
(a) The temperature at the triple point of water is 32.018°F (0.01°C) and the pressure is 611.657 Pa (0.006 atm).
(b) The temperature at the triple point of carbon dioxide is -69.9°F (-56.6°C) and the pressure is 518.2 kPa (5.172 atm).
a). How to find the temperature and the pressure in Pa?For water, the triple point occurs at a temperature of 32.018°F (0.01°C) and a pressure of 611.657 Pa (0.006037 atm). This means that at this specific temperature and pressure, water can exist in equilibrium as ice, liquid water, and water vapor.
b). How to find the temperature and the pressure in Pa?For carbon dioxide, the triple point occurs at a temperature of -56.56°F (-49.2°C) and a pressure of 518.15 kPa (5.1 atm). This means that at this specific temperature and pressure, carbon dioxide can exist in equilibrium as solid dry ice, liquid carbon dioxide, and carbon dioxide gas.
It's important to note that the triple point is a specific point for each substance, and that other substances will have different triple points. The units given in the question are important to note as well, as they may differ from units used in other contexts.
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1. what happens when electromagnetic radiation encounters a metal object? discuss two ways that can be used to reduce interference from electrical noise.
Answers
A full circuit is required for the flow of electrical current, and all electrical energy transmissions need the formation of a circuit with two wires—one going to the recipient and the other going back to the sender.
The construction of a circuit with two wires—one going to the recipient and the other back to the sender—is necessary for all electrical energy transmissions in order for current to flow. Due to the fact that all wireless signals are essentially delivered as electromagnetic signals rather than electrical signals, electromagnetic interference, often known as EMI, is a common problem in wireless communications.
This suggests that any interference with an electromagnetic signal (wave) may cause it to be amplified, destroyed, or lost (assuming constructive interference).
The interference brought on by electromagnetic disturbance is known as electromagnetic interference. Radio frequency interference is another name for it. We refer to interference that occurs in the radio frequency spectrum as radio frequency interference.
These days, wireless communication is expanding at an unprecedented rate. Over a large concentration, a small spectrum is available. Because of this, there is a greater likelihood of mutual interference. The performance of the device and the channel can both be impacted by a slight electromagnetic disturbance. It is crucial to keep interference at a minimal for better wireless performance.
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