What type of universe are we in if there is enough matter so that gravity halts expansion and the universe re-collapses, and perhaps, even bounces to repeat the process?
Answers
If there is enough matter in the universe for gravity to halt expansion, leading to a potential re-collapse and a cyclic behavior, we would be in a closed universe.
The fate of the universe is determined by the overall density of matter and energy within it. Based on current observations and theoretical models, there are three possible types of universes based on density:
Open Universe: If the density of matter and energy is below a critical value, the universe will continue to expand indefinitely. The gravitational force is not strong enough to halt the expansion, and the universe will continue to become increasingly dilute and cool.
Flat Universe: If the density of matter and energy precisely matches the critical value, the expansion of the universe will gradually slow down but never come to a complete halt. The universe will continue to expand at a decreasing rate, approaching zero expansion speed asymptotically.
Closed Universe: If the density of matter and energy exceeds the critical value, the gravitational force will eventually overcome the expansion and cause the universe to re-collapse. This leads to a cyclic behavior where the universe expands, contracts, and potentially bounces back to repeat the process.
If there is enough matter in the universe for gravity to halt expansion, leading to a potential re-collapse and cyclic behavior, we would be in a closed universe. However, it is important to note that the precise nature of our universe is still an active area of research, and further observations and studies are needed to conclusively determine its ultimate fate and type.
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Related Questions
From the point of view of conductive heat loss, which adaptations would be beneficial to animals living in extremely cold climates? A. Large surface area
B. Lots of tissues, like fat, with low thermal conductivity
C. Lots of tissues, like muscle, with high thermal conductivity
D. Thick skin
E. Thin skin
F. Small surface area
Answers
The Correct answer is B, D, F. From the point of view of conductive heat loss, which adaptations would be beneficial to animals living in extremely cold climates
rate of heat loss = K*A*delta T / L
where A: surface area
L: the thickness of the tissue
K: thermal conductivity
High K, A value increases the rate
High L will decrease the rate
the rate should be low.
In thermodynamics, heat is defined as the shape of power crossing the boundary of a thermodynamic gadget through the distinctive features of a temperature difference across the boundary. A thermodynamic device does not contain warmness. nonetheless, the time period is also regularly used to consult the thermal electricity contained in a system as an element of its internal electricity and that is contemplated inside the temperature of the device. For each makes use of the time period, heat is a shape of strength.
Warmth is power in the switch to or from a thermodynamic gadget, by a mechanism that includes the microscopic atomic modes of movement or the corresponding macroscopic properties.
The measurement of strength transferred as heat is referred to as calorimetry, done via measuring its impact on the states of interacting bodies. for example, warmness may be measured by means of the quantity of ice melted, or through trade in the temperature of a frame inside the environment of the machine.
inside the international gadget of units (SI) the unit of dimension for heat, as a shape of electricity, is the joule (J).
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As a wave travels from one spring to another spring with a different mass, its wavelength decreases by 25%. Which statement describes the change in the speed of the wave?
a. The speed decreases by 25% because speed and wavelength are inversely proportional.
b. The speed increases by 25% because speed and wavelength are inversely proportional.
c. The speed increases by 25% because speed and wavelength are directly proportional.
d. The speed decreases by 25% because speed and wavelength are directly proportional.
Answers
The statement describes the change in the speed of the wave is d. The speed decreases by 25% because speed and wavelength are directly proportional.
Since the speed of the wave v = fλ where f = frequency of wave and λ = wavelength
Since f is constant for the wave, v ∝ λ.
So, if the wavelength decreases by 25%, the speed also decreases by 25% since the speed is directly proportional to the wavelength.
So, The statement describes the change in the speed of the wave is d. The speed decreases by 25% because speed and wavelength are directly proportional.
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Hubble investigates the relationship between the red-shift of light and distant galaxies.
give the link that Hubble found between observing red-shift and how far away they are from Earth .
Answers
Hubble concluded that there is a linear redshift-distance relationship; that is, if one galaxy is twice as far away as another, its redshift is twice as large.
HUbble's lawIn 1929, Edwin Hubble published his first paper on the relationship between redshift and distance. He tentatively concluded that there is a linear redshift-distance relationship; that is, if one galaxy is twice as far away as another, its redshift is twice as large.
This relationship is known as the Hubble relation. If you graph this relation, the slope of the line is the Hubble constant or a measure of the expansion rate of the universe.
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the energy transfer that takes place by direct contact is called ____
Answers
Answer:
Conduction
Explanation:
The transfer of energy through matter by direct contact of particles is called. Conduction.
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Calculate the pressure of water when on the bottom of swimming pool if the depth of water in the pool varies between 0.8m and 2.4m if density is 1000kg/m^3. if A.T.P is 101000pa, calculate the maximum total pressure at the bottom of the swimming pool
Answers
To calculate the pressure of water at the bottom of the swimming pool, we can use the hydrostatic pressure formula: P = ρgh, where P is the pressure, ρ is the density of water, g is the acceleration due to gravity, and h is the depth of the water.
Given:
Density of water (ρ) = 1000 kg/m^3
Acceleration due to gravity (g) = 9.8 m/s^2
Minimum depth of water (h_min) = 0.8 m
Maximum depth of water (h_max) = 2.4 m
To calculate the pressure at the bottom of the pool, we will use the maximum depth (h_max):
P_max = ρgh_max = 1000 kg/m^3 * 9.8 m/s^2 * 2.4 m = 23,520 Pa
Therefore, the maximum pressure at the bottom of the swimming pool is 23,520 Pa.
To calculate the maximum total pressure, we need to add the atmospheric pressure (A.T.P) to the hydrostatic pressure at the bottom of the pool:
Maximum Total Pressure = P_max + A.T.P = 23,520 Pa + 101,000 Pa = 124,520 Pa
Therefore, the maximum total pressure at the bottom of the swimming pool is 124,520 Pa.
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Which feature causes a gap in the geologic record?
extrusion
fault
intrusion
erosion
Answers
Answer:
A
Explanation:
Answer : a. Extrusion
(100 POINTS FOR CORRECT ANSWER)
A train leaves the station heading north on the tracks. It takes the train 6 seconds to reach 60 miles per hour. It completes the entire 60 mile trip in one hour. Calculate the train's average speed and velocity over the one hour trip. Show your work. Identify if each of the measurements are a scalar or vector quantity.
Answers
Answer:
10 i hope this is right good luck
How to determine the output power (in watts) of a voltage rail
Answers
Answer:
.
Explanation:
To determine the output power (in watts) of a voltage rail, you need to know both the voltage and the current flowing through the rail. The formula for power (in watts) is P = V x I, where P is power, V is voltage, and I is current. So, if you know the voltage and current of the voltage rail, you can multiply them together to get the output power. Keep in mind that power is measured in watts, voltage is measured in volts, and current is measured in amperes.
To determine the output power (in watts) of a voltage rail, you'll need to know the voltage across the rail (in volts) and the current flowing through it (in amperes). You can use the following formula:
Power (in watts) = Voltage (in volts) × Current (in amperes)
Step 1: Measure the voltage across the rail using a voltmeter.
Step 2: Measure the current flowing through the rail using an ammeter.
Step 3: Multiply the measured voltage and current values to calculate the output power in watts.
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A solution which has a solid solute is saturated at 25°C. It is then heated to 35°C. There is no change in the appearance of the solution. What term would now be associated with this solution?
A.
unsaturated
B.
saturated
C.
oversaturated
D.
supersaturated
Answers
Answer:
C. oversaturated
Explanation:
Sana nakatulong
Balance the following chemical equation:
H3PO4 + HCl → PC15 + H20
Answers
Answer:
H3PO4 + 5HCl → PCl5 + 4H2O
Explanation:
Find direction of sum
Answers
Explanation:
V² = Vx² + Vy²
= [3.14 cos(30)]² + [2.71 cos(300)]²
= 9.23
V = root 9.23 = 3.038
can you please mark my answer brainliest ♥️...
A wedge makes work easier by ___.
Answers
Answer:
by increasing the force applied to the objects
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A 2.0 kg bullet is fired into a sandbag sitting on a wagon. The combined mass of the wagon and the sandbag is 4.5 kg. a) If the wagon/sandbag/bullet moved together with a speed of 0.22 m/s immediately after impact with the bullet, with what speed did the bullet enter the sandbag? b) Is this an elastic or inelastic collision? Explain.
Answers
Answer:
To answer your question use the code ICE on here to get your answer works every time for me hope this helps
when an ice skater pulls in her initially outstretched arms while spinning on point, does she change her angular momentum
Answers
Yes, the ice skater changes her angular momentum when she pulls in her outstretched arms while spinning on point. Angular momentum is the product of moment of inertia and angular velocity, and is conserved in the absence of external torques.
When the ice skater pulls in her arms, she decreases her moment of inertia, which means that her angular velocity must increase in order to maintain conservation of angular momentum. This is because angular momentum is conserved when there is no net external torque acting on the system.
This phenomenon is known as the conservation of angular momentum, which states that the total angular momentum of a system remains constant in the absence of external torques. Therefore, as the ice skater pulls in her arms, she decreases her moment of inertia, which causes her angular velocity to increase in order to conserve her angular momentum. This makes her spin faster.
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Complete Question
When an ice skater pulls in her initially outstretched arms while spinning on point, does she change her angular momentum? If so, does it increase or decrease?
Describe possible factors influencing incoming solar radiation,
composition of incoming radiation, and what ultimately happens
(percent breakdown) to the radiation that does enter the
atmosphere.
Answers
Factors influencing incoming solar radiation include solar angle, atmospheric conditions, and surface characteristics.
Several factors influence the amount of solar radiation reaching Earth's surface. The solar angle, determined by the Earth's tilt and position in its orbit, affects the intensity of radiation. Atmospheric conditions such as cloud cover, aerosols, and pollution can scatter or absorb radiation. Surface characteristics, such as albedo (reflectivity) and vegetation, also influence the amount of incoming radiation.
The composition of incoming solar radiation consists primarily of visible light, ultraviolet (UV) radiation, and infrared (IR) radiation. Visible light is the range of wavelengths perceived by human eyes. UV radiation has shorter wavelengths and can be harmful to living organisms. IR radiation has longer wavelengths and carries heat energy.
Once solar radiation enters the atmosphere, several processes occur. Approximately 30% of incoming radiation is reflected back into space by clouds, atmospheric particles, and the Earth's surface. About 20% is absorbed by the atmosphere, including gases like ozone and water vapor. The remaining 50% reaches the Earth's surface, where it is absorbed by land, water, and vegetation, contributing to various physical and biological processes such as heating the Earth's surface, driving weather patterns, and supporting photosynthesis.
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Suppose you have a 125-kg wooden crate resting on wood floor; (uk 0.3 and Us 0.5) (a) What maximum force (in N) can you exert horizontally on the crate without moving it? (b) If you continue to exert this force (in m/s?) once the crate starts to slip, what will the magnitude of its acceleration then be? ms
Answers
(a) To determine the maximum force that can be exerted horizontally on the crate without moving it, we need to consider the static friction force. The maximum force can be calculated using the formula:
Maximum force = coefficient of static friction * normal force
The normal force is equal to the weight of the crate, which can be calculated as:
Normal force = mass * acceleration due to gravity
Substituting the given values:
Normal force = 125 kg * 9.8 m/s^2
Next, we can calculate the maximum force:
Maximum force = 0.3 * (125 kg * 9.8 m/s^2)
(b) Once the crate starts to slip, the friction changes from static friction to kinetic friction. The magnitude of the acceleration can be calculated using the formula:
Acceleration = (force exerted - kinetic friction) / mass
The kinetic friction force is given by:
Kinetic friction = coefficient of kinetic friction * normal force
Using the given values:
Kinetic friction = 0.5 * (125 kg * 9.8 m/s^2)
To find the force exerted, we use the maximum force calculated in part (a).
Finally, we can calculate the acceleration:
Acceleration = (maximum force - kinetic friction) / mass
Please note that without specific values for the coefficient of static friction, coefficient of kinetic friction, or the maximum force, I cannot provide numerical answers in N or m/s.
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In rugby, two athletes run at each other with the same velocity. What other key variable determines the momentum of each athlete as they run toward one another
Answers
From what we know, we can confirm that the other key variable that determines the momentum of the rugby players is the body mass of each player.
Why is body mass a key variable?This has to do with the formula regarding how to calculate momentum. The formula takes into account two values. The question states that two athletes run at each other with the same velocity. Velocity is our first value, and by multiplying it by the body mass, we can calculate the momentum.
Therefore, given that momentum is calculated by multiplying the body mass by the velocity of the players, we can confirm that the other key variable that determines the momentum of the rugby players is the body mass of each player.
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A 25 N force is used to push a box across a floor against a frictional force of 14 N. The box accelerates from rest to a speed of 4 m/s in 16 s. What is the mass of the box?
Answers
todjghozjfh-xjdfg .FExplanation:dthgzdfhsfhfh
dhfhdfhdfhhdffhd
Which statement correctly describes the nucleus of the atom?
The nucleus of the atom contains electrons.
The nucleus of the atom is mostly empty space.
The nucleus of the atom surrounds the center of the atom.
The nucleus of the atom contains most of the mass of an atom.
Answers
The nucleus of the atom contains most of the mass of an atom.
Explaination:
Brainliest Answer pls
Answer: The nucleus of the atom contains most of the mass of an atom.
When a star is so dense that its atoms have their electrons smashed in toward the nucleus (resulting in densities about a million times greater than water), the resulting material is called ________.
Answers
When a star is so dense that its atoms have their electrons smashed in toward the nucleus (resulting in densities about a million times greater than water), the resulting material is called a Neutron star.
What is Star?Stars are present in the galaxy that have the ability to generate their own light. They are both quite hot and very huge.
They are largely formed of hydrogen, with a trace of helium thrown in for good measure.
The sun is also a star, and its energy and light play an important part in the survival of all kinds of life on Earth.
When a star is so dense that its atoms have their electrons smashed in toward the nucleus (resulting in densities about a million times greater than water), the resulting material is called a Neutron star.
Hence the correct answer is a neutron star.
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Mention two factors on which the internal resistance of a cell depends.
Answers
Answer:
Explanation:
(1) The surface area of the electrodes: Larger the surface area of the electrodes, less is the internal resistance.
(2) The distance between the electrodes: As the distance between the electrodes increases, the internal resistance of cell also increases.
The formula is given by
\(\\ \rm\Rrightarrow R=\rho\dfrac{\ell}{A}\)
rho is resistivityl is length of cellA is surface area.On these three factors resistance depends
also
According to ohms law
V/I=RResistance also depends on voltage and current
An object of mass 178 kg moves in a smooth
straight tunnel of length 2640 km dug through
a chord of a planet of mass 4.48 x 1024 kg and
radius 8.26 x 106 m.
y
F/m
Find the effective force constant of the har-
monic motion.
The value of gravitational
constant is 6.67259 x 10-¹1 Nm²/kg².
Answer in units of N/m.
Answers
Answer: If the mass of the object is 178 kg: k = 9.44*10^-5 N/m
Answer for the mass being 82 kg is not complete, because G was not given.
Explanation:
If the mass of the object is 178 kg:
The mass of object (m) = 178 kg
Length of tunnel (l) = 2640 km
***The minimum displacement (its amplitude) of object from its mean position,
A = 2640/2 = 1320 km = 1.320 * 10^6 m
Mass of planet (M) = 4.48 * 10^24 kg
Its Radius (R) = 8.26 * 10^6 m
Gravitational constant (G) = 6.67259 * 10^-11 Nm^2/kg^2
Now, restoring force for given hormonic motion will be
Vector of F = -((GMm)/R^3) * x
Comparing with, vector of F = -k*x, we get
k = (GMm)/R^3
k = (((6.67259*10^-11)*(4.48*10^24)*178)/(8.26*10^6)^3)
k = ((5320.99017*10^(-11+24))/(563.559976*10^18))
k = 9.44*10^(13-18)
k = 9.44*10^-5 N/m
If the mass of the object is 82 kg:
The mass of object (m) = 82 kg
Length of tunnel (l) = 2430 km
***The minimum displacement (its amplitude) of object from its mean position,
A = 2430/2 = 1215 km = 1.215*10^6 m
Mass of planet (M) = 4.16 * 10^24 kg
Its Radius (R) = 7 * 10^6 m
Gravitational constant (G) not given in the photo
Now, restoring force for given hormonic motion will be
Vector of F = -((GMm)/R^3) * x
Comparing with, vector of F = -k*x, we get
k = (GMm)/R^3
k = ((G*(4.16*10^24)*82)/(7*10^6)^3)
Remember that when multiplying two values with exponents, you add the exponents together!
k = ((3.4112*10^26 * G)/(3.43*10^20))
Insert G to solve!
A 2 kg cue ball is moving at a velocity of 2 m/s when it collides with another 3 kg billiard ball at rest.
What is the total momentum of the system?
Answers
A 2 kg cue ball is moving at a velocity of 2 m/s when it collides with another 3 kg billiard ball at rest. The total momentum is 4 kg m/ s.
Elaborating the problem:
Before the collision, the momentum of the 2 kg cue ball is:
p₁ = m₁ × v₁
p₁ = 4 kg m/s
The 3 kg billiard ball is at rest, so its momentum is: p₂ = 0 kg m/s
The total momentum of the system before the collision is:
p_total = p₁ + p₂
p_total = 4 kg m/s
The total momentum of the system after the collision is:
p_total = M × \(V_{f}\)
p_total = p₁ + p₂
M × \(V_{f}\) = p₁ + p₂
5 kg × \(V_{f}\) = 4 kg m/s + 0 kg m/s
5 kg * \(V_{f}\) = 4 kg m/s
Therefore, \(V_{f}\) = 0.8 m/s
So, the total momentum of the system is:
p_total = M × \(V_{f}\)
p_total = 5 kg × 0.8 m/s
p_total = 4 kg m/s
What is any system's total momentum?
A system's total momentum is the sum of the momentum of all its components. To put it another way, it is the total amount of motion experienced by the system's objects. The total momentum of an isolated system remains constant when there are no external forces acting on it, as stated by the law of conservation of momentum.
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what changes must a gas undergo to become a liquid?
Answers
The conversion of gas into liquid happens due to condensation.
Condensation is the process through which the physical state of matter changes from the gaseous phase into the liquid phase. For example, condensation occurs when water vapour (gaseous form) in the air changes into liquid water when it comes in contact with a cooler surface. When the water in the air comes in contact with a cold surface, it condenses to form water droplets. The opposite of condensation is evaporation reaction.When temperature is increased and pressure is decreased, the gaseous state is converted into liquid state on this impact. This also can be reversed by decreasing the temperature and increasing the pressure.To know more about gases visit:
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you hold the can stationary for half a minute, waiting for a friend on a ladder to take it. how much work do you do during this time?
Answers
While you hold the can stationary for half a minute, waiting for a friend on a ladder to take it, you do not do any work during this time.
What is work not done in physics?
No work, as used above, is accomplished until the object is moved in some fashion and a component of the force travels along the path the object is moved along. No energy is transferred to a heavy object while it is held still since there is no displacement.What does "doing work" entail in physics?
The work is the quantity of energy that is moved from one thing or form to another. The act of transmitting such energy is called working. Applying a force over a distance is necessary for performing tasks. Energy is either transferred into or out of an object depending on the sign of the work that has been done on it.To learn more about work done, follow the link https://brainly.com/question/14900441
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1. What does a negative value mean? Can distance be negative? Explain.
Answers
Answer: A negative value is values and frequency for the data you are analyzing had enough negative values. Sometimes distance can be negative. For example, when you are in the pool, underwater, or standing left from the middle of origin.
Explanation:
what is the process of a blue giant star?
they didn't have astronomy on here so I just choose something related to the sorts.
Answers
The process of the blue giant start includes stellar Formation, main Sequence Phase, expansion and Cooling, helium Fusion, variable Behavior, and supernova.
What is the process of a blue giant star?The stage in the formation of a star just before nuclear reactions ignite. After a massive red giant star ejects its outer layers, its hot inner core is exposed, and it becomes a blue giant star.
During the process of a blue giant star, once a star consumes all its hydrogen, the core superheats and pushes its surface layers far out into space.
The process of the blue giant start includes;
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A soccer player standing on a football field kicks a soccer ball off of the gound at the 10 yard line and it lands at the 30 yard line.
Answers
To determine the horizontal distance covered by the soccer ball, we can subtract the initial position (10 yards) from the final position (30 yards).
Horizontal distance = Final position - Initial positionHorizontal distance = 30 yards - 10 yardsHorizontal distance = 20 yardsTherefore, the soccer ball covers a horizontal distance of 20 yards.
About soccer ballA soccer ball is a ball used in the game of soccer. In general, soccer balls are made of leather. In its development, the ball kicked by these players has undergone very significant changes.
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Blank is a good way to for me to see where I am going while
dribbling
Answers
Answer:
???
Explanation:
Air pressure decreases as elevation increases. Describe how the boiling point of
water on top of a mountain would be different from its boiling point at sea level.
Answers
Answer:
The boiling point on top of a mountain would be lower than at sea level because the altitude would be higher and air pressure would decrease.
As the height increases, because most of the air molecules are held near to the surface and hence pressure by gaseous substance will be lower at higher altitudes results in lowering boiling point also.
What is boiling point?Boiling point of a substance is the temperature at which the substance changes from the liquid state to vapor state where both phases are in equilibrium and the pressure of vapor phase above the liquid phase will be equal to the atmospheric pressure.
The boiling point is dependent on the bond type, molecular weight, temperature and pressure. At higher altitudes, the pressure will be reduced due to the less denser air.
The volume of gas molecules is higher on elevation and thus, a decreased pressure causes, the water molecules easily boil with weekend intermolecular force thus, boiling point at mountain will be less than that at sea level.
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