Explain the Big Bang and how it started
Answers
The big bang is how astronomers explain the way the universe began. It is the idea that the universe began as just a single point, then expanded and stretched to grow as large as it is right now (and it could still be stretching).
The short answer: The big bang is how astronomers explain the way the universe began. It is the idea that the universe began as just a single point, then expanded and stretched to grow as large as it is right now (and it could still be stretching).
The long answer: For most of human history, observers of the sky assumed it eternal and unchanging. Edwin Hubble dealt this story an experimental blow in the 1920s when his observations showed both that galaxies outside the Milky Way existed, and that their light appeared stretched — a sign that they were rushing away from Earth.
George Lemaître, a contemporary Belgian physicist, interpreted data from Hubble and others as evidence of an expanding universe, a possibility permitted by Einstein's recently published field equations of general relativity. Thinking backwards, Lemaître inferred that today's separating galaxies must have started out together in what he called the "primeval atom."
The first public use of the modern term for Lemaître's idea actually came from a critic — English astronomer Fred Hoyle. On March 28, 1949, Hoyle coined the phrase during a defense of his preferred theory of an eternal universe that created matter to cancel out the dilution of expansion. Hoyle said the notion that "all matter of the universe was created in one big bang at a particular time in the remote past," was irrational. In later interviews, Hoyle denied intentionally inventing a slanderous name, but the moniker stuck, much to the frustration of some.
"The Big Bang is a really bad term," said Paul Steinhardt, a cosmologist at Princeton. "The Big Stretch would capture the right idea." The mental image of an explosion causes all kinds of confusion, according to Steinhardt. It implies a central point, an expanding frontier, and a scene where light shrapnel flies faster than heavier chunks. But an expanding universe looks nothing like that, he said. There's no center, no edge, and galaxies large and small all slide apart in the same way (although more distant galaxies move away faster under the cosmologically recent influence of dark energy).
Regardless of its name, the Big Bang theory found widespread acceptance for its unparalleled ability to explain what we see. The balance of light with particles like protons and neutrons during the first 3 minutes, for instance, let early elements form at a rate predicting the current amounts of helium and other light atoms.
"There was a small window in time where it was possible for nuclei to form," said Glennys Farrar, a cosmologist at New York University. "After that, the universe kept expanding and they couldn't find each other, and before [the window] it was too hot."
A cloudy plasma filled the universe for the next 378,000 years, until further cooling let electrons and protons form neutral hydrogen atoms, and the fog cleared. The light emitted during this process, which has since stretched into microwaves, is the earliest known object researchers can study directly. Known as the cosmic microwave background (CMB) radiation, many researchers consider it the strongest evidence for the Big Bang.
Misconseption: Beginning at the beginning, a common question asked by laymen and some physicists is what the universe expands into. The very terminology of the ``big bang'' suggests an explosion, which flings debris out into some void. Such a picture is strongly suggested by many semi-popular descriptions, which commonly include a description of the initial instant as one ``where all the matter in the universe is gathered at a single point'', or something to that effect. This phrase can probably be traced back to Lemaître's unfortunate term ``the primaeval atom''. Describing the origin of the expansion as an explosion is probably not a good idea in any case; it suggests some input of energy that moves matter from an initial state of rest. Classically, this is false: the expansion merely appears as an initial condition. This might reasonably seem to be evading the point, and it is one of the advantages of inflationary cosmology that it supplies an explicit mechanism for starting the expansion: the repulsive effect of vacuum energy. However, if the big bang is to be thought of explosively, then it is really many explosions that happen everywhere at once; it is not possible to be outside the explosion, since it fills all of space. Because the density rises without limit as t -> 0, the mass within any sphere today (even the size of our present horizon) was once packed into an arbitrarily small volume. Nevertheless, this does not justify the ``primaeval atom'' terminology unless the universe is closed. The mass of an open universe is infinite; however far back we run the clock, there is infinitely more mass outside a given volume than inside it.
Related Questions
In the reaction shown, iron reacts with water to form iron oxide (Fe3O4) and hydrogen gas (H₂).
3Fe + 4H₂0
Fe3O4 + 4H₂
Which of these BEST describes the iron (Fe) reactant?
A. molecule
B. ion
C. compound
D. Element
Answers
Cold water does not react with iron. Iron, however, interacts with steam to create iron and hydrogen oxide. Fe3O4 + 4H2 = 3Fe(s) + 4H2O. Iron (II, III) oxide, also known as ferric oxide (Fe3O4), is a combination of Fe O and Fe2O3.
What happens when water and iron are combined?Ferric oxide (Fe2O3) and hydrogen gas are produced when ferrous oxide (Fe O) and water (H2O) combine (H2). This reaction yields a black solid called Fe3O4, which is frequently used as an antirust pigment. Understanding the chemical equation for this reaction is required to determine whether a specific mixture will produce Fe3O4: 2Fe3+(aq)+3H2 = 2Fe(s)+3H2(g) (g). According to this equation, two moles of iron metal will interact with to create two moles of ferric ion and three moles of hydrogen gas, it takes three moles of hydrogen gas. All of the iron will be transformed to Fe3+ ions and no Fe3O4 will occur if the combination only contains one mole of each component.
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the upward force exerted by a gas or liquid is called
a. pressure
b. upthrust
c. torque
d. all the above
Answers
b. upthrust. The upward force exerted by a gas or liquid is called upthrust.
This force is generated due to the content loaded and the pressure exerted by the gas or liquid. A fluid's buoyancy, also known as upthrust, opposes the weight of an item that is partially or completely submerged by exerting an upward push. The weight of the fluid on top causes pressure in a fluid column to rise with depth. As a result, the pressure at the bottom of a fluid column is higher than at the top. Similar to this, an object submerged in a fluid experiences greater pressure at its bottom than it does at its top. A net upward force is exerted on the item as a result of the pressure differential.
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which statement is wrong concerning the two tails of a comet? a. they are ion tail and dust tail. b. they are perpendicular to each other. c. dust tail is more massive than ion tail. d. they all pointing away from the sun.
Answers
The statement that is wrong concerning the two tails of a comet is "they are perpendicular to each other." Two tails of a comet can't be perpendicular to each other.
Comets are celestial bodies that circle around the sun, originating from the Kuiper Belt and Oort Cloud. Comets are believed to be made up of ice, rock, and dust, and they can range in size from a few meters to tens of kilometers in diameter. Comets typically consist of two tails: a gas or plasma tail and a dust tail. Two tails of a comet. The two tails of a comet are made up of gas, plasma, and dust. They all point in opposite directions from the comet's nucleus, or core, as it travels through space. The dust tail of a comet is more massive than its ion tail, which is made up of electrically charged particles that are affected by the sun's magnetic field. Both tails of a comet are not perpendicular to each other because they are pointing in opposite directions. A gas tail may be tens or hundreds of thousands of kilometers long. It consists of highly volatile molecules such as water and carbon dioxide that have been energized by the sun's ultraviolet radiation. As they lose energy, the molecules release the energy in the form of light, which is what makes the gas tail visible. A dust tail, on the other hand, consists of tiny grains of rock and dust that have been kicked off the surface of the comet. It's typically much shorter than the gas tail, but it can be much brighter.
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If a car is traveling 100 km/h west and comes to a stop in 3 min, what is the car's acceleration? Need procedure.
Answers
Answer:
a = 0.154 [m/s^2]
Explanation:
To solve this problem we must use the following formula of kinematics.
\(v_{f}= v_{i}-(a*t)\\\)
where:
Vf = final velocity = 0
Vi = initial velocity = 100 [km/h]
t = time = 3 [min] = 180 [s]
Now we need to convert the velocity from [km/h] to [m/s]
\(100[\frac{km}{h} ]*1000[\frac{m}{1km} ]*1[\frac{h}{3600s} ]=27.77[\frac{m}{s} ]\)
0 = 27.77 - (a*180)
a = 0.154 [m/s^2]
Note: the negative sign of the equation shows, that the car slows down until it stops
an astronaut is said to be weightless when he/she travels in a satellite.does it mean that the earth does not attract him/her?
Answers
Answer:
No, gravitational force is a force having infinite range. It only reduces to an extent that astronauts cannot feel it.
Explanation:
The function of a body part depends upon the way it is constructed. The branch of medical science called considers the functions of anatomical parts, whereas describes the form and organization of body parts.
Answers
Answer:
. The branch of medical science called PHYSIOLOGY considers the functions of anatomical parts, whereas ANATOMY describes the form and organization of body parts.
Explanation:
THIS is because Anatomy the branch of life studyconcerned with the study of the structure of organisms and their parts
Whilw physiology studies the functioning of these parts
The branch of medical science that considers the functions of anatomical parts is called physiology, whereas anatomy describes the form and organization of body parts.
Physiology is the study of how body parts function and work together to maintain life processes and perform specific tasks. It focuses on the mechanisms and processes that underlie bodily functions, such as digestion, circulation, and muscle contraction.
On the other hand, anatomy is concerned with the structure, shape, and organization of body parts, including organs, tissues, and cells.
Together, anatomy and physiology provide a comprehensive understanding of the human body and its intricate workings, helping medical professionals diagnose and treat illnesses and maintain overall health.
Therefore, The branch of medical science that considers the functions of anatomical parts is called physiology.
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The equation below is used to calculate the mechanical advantage of an ideal wheel and axle.
mechanical advantage =
wheel radius
__________
axle radius
A student compares two wheel-and-axle simple machines. Machine 1 has a wheel radius of 50 centimeters, and an axle radius of 10 centimeters. Machine 2 has a wheel radius of 100 centimeters, and an axle radius of 10 centimeters. What is true of these simple machines’ mechanical advantage?
A.
Machine 1’s mechanical advantage is greater, which means that this machine can do more work with less force than Machine 2.
B.
Machine 1’s mechanical advantage is greater, which means that this machine can move faster than Machine 2.
C.
Machine 2’s mechanical advantage is greater, which means that this machine can do more work with less force than Machine 1.
D.
Machine 2’s mechanical advantage is greater, which means that this machine can move faster than Machine 1.
Answers
Answer:
b
Explanation:
Machine 2’s mechanical advantage is greater, which means that this machine can do more work with less force than Machine 1.
Mechanical advantageThe term mechanical advantage is the ratio of the radius of wheel to the radius of the axle for a wheel and axle system.
The true statement about the two machines that were compared; 1 and 2 is that, machine 2’s mechanical advantage is greater, which means that this machine can do more work with less force than Machine 1.
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A cloud contains spherical drops of water of radius R and charge Q. Assume the drops are far apart.
1. The electric field E0 and potential V0 at the surface of each drop is given by?
2. If two droplets happen to combine into a single larger droplet, the new potential V at the surface of the larger droplet is most nearly equal to:
Answers
1. The electric field E_0 and potential V_0 at the surface of each drop is given by the equation E_0\ =\ \frac{Q}{4\pi\varepsilon_0R^2} and V_0=\frac{Q}{4\pi\varepsilon_0R} respectively. 2. The new potential V at the surface of the larger droplet is most nearly equal to the original potential V_0.
1. The electric field E0 and potential V0 at the surface of each drop can be found using the formulas for electric field and potential of a sphere.
The electric field E_0 is given by:
E_0\ =\ \frac{Q}{4\pi\varepsilon_0R^2}
and the potential V_0 is given by:
V_0=\frac{Q}{4\pi\varepsilon_0R}
where Q is the charge of the drop, R is the radius of the drop, and ε0 is the permittivity of free space.
2. When two droplets combine into a single larger droplet, the new potential V at the surface of the larger droplet will be given by: V_0=\frac{Q}{4\pi\varepsilon_0R^'}
where Q is the total charge of the two droplets (Q = Q1 + Q2), R' is the new radius of the larger droplet, and \varepsilon_0 is the permittivity of free space.
Since the volume of a sphere is given by V = (4/3)πR^3, the new radius R' will be given by:
R' = (3V/4π)^(1/3) = (3(4/3)πR^3/4π)^(1/3) = R^(3/3) = R.
Therefore, the new potential V at the surface of the larger droplet will be:
V = Q/(4πε0R) = (Q1 + Q2)/(4πε0R) = V_0
So the new potential V at the surface of the larger droplet is most nearly equal to the original potential V_0.
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How much current, in amperes, is in a lightning stroke that lasts 0.05 second and transfers 100 coulombs
Answers
The amount of current, in amperes, in a lightning stroke that lasts 0.05 seconds and transfers 100 coulombs is 2000 amperes (A).
Electric current, which is a flow of electric charge carriers, is measured in amperes (A). A lightning stroke is an electrical discharge from the atmosphere to the ground. It is a huge electric current, with its current, magnitude, and duration varying greatly from one lightning stroke to the next.
A coulomb (C) is the International System of Units (SI) unit of electric charge. A coulomb is the quantity of charge carried by a current of one ampere flowing for one second. It is a large unit of charge. One coulomb of charge equals the flow of one ampere of current for one second. As a result,100 coulombs of charge are transferred over a period of 0.05 seconds, which equates to an average current of
I = q / t.
I = 100 / 0.05 = 2000 A
Therefore, the average current in the lightning stroke is 2000 amperes.
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10. A pitcher in a professional baseball game throws a fastball, giving the baseball
a momentum of 5.83 kg. m/s. Given that the baseball has a mass of 0.145 kg,
what is its speed?
Answers
Answer: 40.2m/sec
Work: v=p/m= 5.83kg/0.145k=40.2cm/sec
The half life of carbon-14 is 5730 years. How old is a bone if it presently contains 0.3125 g of carbon-14, but it was estimated to have originally contained 80 g of carbon-14?
Answers
The age of the bone is 45840 years.
We'll begin by calculating the number of half-lives that has elapsed.
Amount remaining (N) = 0.3125 g
Initial amount (N₀) = 80 g
Number of half-lives (n) =?N × 2ⁿ = N₀
0.3125 × 2ⁿ = 80
Divide both side by 0.3125
2ⁿ = 80 / 0.3125
2ⁿ = 256
2ⁿ = 2⁸
n = 8Thus, 8 half-lives has elapsed
Finally, we shall determine the age of the bone.
Half-life (t½) = 5730 years
Number of half-lives (n) = 8
Time (t) =?t = n × t½
t = 8 × 5730
t = 45840 yearsTherefore, the age of the bone is 45840 years.
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(a) Calculate the number of free electrons per cubic meter for some hypothetical metal, assuming that there are 1.3 free electrons per metal atom. The electrical conductivity and density are 6.0 × 107 (?-m)-1 and 8.9 g/cm3, respectively, and its atomic weight is 63.55 g/mol. Use scientific notation.
(b) Now compute the electron mobility for this metal.
Answers
(a) The number of free electrons per cubic meter for the hypothetical metal is 9.93 × 10²² m⁻³.
(b) The electron mobility for this metal is 3.61 × 10⁻³ m²/Vs.
(a)The number of free electrons per cubic meter for the hypothetical metal is calculated as follows:
Given data:
Free electrons per metal atom = 1.3
Density = 8.9 g/cm³
Atomic weight = 63.55 g/mol
Electrical conductivity = 6.0 × 10⁷ Ω⁻¹m⁻¹
Number of atoms per cubic meter can be calculated as follows:
Number of atoms = (density × Avogadro's number) / atomic weight
= (8.9 × 10³ kg/m³ × 6.022 × 10²³ atoms/mol) / 63.55 g/mol
= 8.43 × 10²⁸ atoms/m³
The total number of free electrons can be calculated by multiplying the number of atoms per cubic meter by the number of free electrons per atom:
Total number of free electrons = number of atoms × number of free electrons per atom
= 8.43 × 10²⁸/m³ × 1.3 free electrons/atom
= 1.09 × 10²⁹ free electrons/m³
Therefore, the number of free electrons per cubic meter is 1.09 × 10²⁹/m³ = 9.93 × 10²²/m³ (in scientific notation).
(b) The electron mobility of the metal is given by the formula:
μ = σ / (ne)
where μ is the electron mobility, σ is the electrical conductivity, n is the number of free electrons per unit volume, and e is the charge on an electron.
Substituting the given values, we get:
μ = 6.0 × 10⁷ Ω⁻¹m⁻¹ / (1.09 × 10²⁹/m³ × 1.6 × 10⁻¹⁹ C)
= 3.61 × 10⁻³ m²/Vs
Therefore, the electron mobility for the metal is 3.61 × 10⁻³ m²/Vs (in scientific notation).
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which part of the picture shows evidence of matter scattering light waves on many diffrent directions
Answers
Answer:
A- The image of the moon on the waters surface is distorted.
Explanation:
Suppose that the gas expands from V0 to V1 at constant pressure p0 . How much work W is done by the gas
Answers
The work done by a gas expanding from volume \(V_0\) to \(V_1\) at constant pressure \(p_0\) is given by the equation: \(\[ W = p_0 \cdot (V_1 - V_0) \]\).
This equation is derived from the definition of work, which is the product of the force applied and the displacement along the direction of the force. In this case, the force is the pressure exerted by the gas, and the displacement is the change in volume.
The equation shows that the work done is directly proportional to the pressure and the change in volume. If the volume increases (\(V_1 > V_0\)), the work done by the gas is positive, indicating that the gas is performing work on its surroundings. On the other hand, if the volume decreases (\(V_1 < V_0\)), the work done is negative, indicating that work is done on the gas by its surroundings.
The equation assumes that the pressure remains constant throughout the expansion process. This is known as an isobaric process. In reality, achieving true constant pressure can be challenging, but in many practical scenarios, the pressure can be maintained at a reasonably constant level.
In summary, the work done by a gas expanding at constant pressure is given by the equation \(\( W = p_0 \cdot (V_1 - V_0) \)\). The work done depends on the change in volume and the constant pressure.
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Jake appears to have several personalities. One is his dead cousin Bob, who
apparently bought a car Jake didn't know about. Jake said he had no memory
of buying the car. Jake also has a personality of a 12-year-old child. Jake
appears to be suffering from:
A. schizophrenia.
B. generalized anxiety disorder.
C. dissociative identity disorder.
D. major depression.
SUBMIT
Answers
-
This should be easy to spot
Answer: DISSOCIATIVE IDENTITY DISORDER
Explanation:
Matt plays badminton. He serves the birdie with a velocity of 4.25 m/s [right] covering a displacement of 5.2 m [forward]. How much time does this birdie’s trip take? show your work below
Answers
Answer:
Time taken by birdie’s trip = 1.2235 s (Approx)
Explanation:
Given:
Velocity = 4.25 m/s
Displacement = 5.2 m
Find:
Time taken by birdie’s trip = ?
Computation:
⇒ Time taken = Displacement / Velocity
⇒ Time taken by birdie’s trip = Displacement / Velocity
⇒ Time taken by birdie’s trip = 5.2 m / 4.25 m/s
⇒ Time taken by birdie’s trip = 1.2235 s (Approx)
A(n) 0.49 kg softball is pitched at a speed of20 m/s. The batter hits it back directly at thepitcher at a speed of 25 m/s. The bat acts onthe ball for 0.012 s. What is the magnitude of the average force exerted by the bat on the ball? Answer in units of N.
Answers
Given,
The mass of the softball, m=0.49 kg
The speed with which the ball was thrown, u=-20 m/s
The speed of the ball after the batter hits it, v=25 m/s
The time duration for which the bat acts on the ball, t=0.012 s
Here we have considered the direction from the pitcher to the batter as the negative direction and the direction from batter to the pitcher as the positive direction.
The momentum of an object is given by the product of the mass of the object and its velocity.
The change in the momentum of the ball is given by,
\(\begin{gathered} \Delta p=mv-mu \\ =m(v-u) \end{gathered}\)On substituting the known values,
\(\begin{gathered} \Delta p=0.49(25-(-20)) \\ =22.05kg\cdot\frac{m}{s} \end{gathered}\)The change in the momentum is equal to the impulse that acts on an object due to the applied force. And the impulse is given by the product of the applied force and the time duration.
Thus,
\(\begin{gathered} I=\Delta p \\ =F\cdot t \\ \Rightarrow F=\frac{\Delta p}{t} \end{gathered}\)Where I is the impulse and F is the magnitude of the average force exerted by the bat on the ball.
On substituting the known values,
\(\begin{gathered} F=\frac{22.05}{0.012} \\ =1837.5\text{ N} \end{gathered}\)Thus the magnitude of the average force exerted by the bat on the ball is 1837.5 N
A box weighing 10 N is sitting on a surface that is tilted upward at a 45⁰ angle. The normal force is __________ 10 N.
a. equal to
b. less than
c. greater than
Answers
The normal force is less than the 10 N
Since we are given a box weight that is 10 N tilted at 45⁰, so the formula we refer from the figure to for calculating the normal force is:
N=mg⋅cos θ , where mg is the weight of the box and θ is the angle at which the box is shifted.
The flatter the incline to be, the normal force becomes greater. The littler an angle gets to be making the greater the esteem of cosine gets to be, and along these lines the greater the normal force becomes.
So, we get that the normal force will be
= 10 cos 45 (Since the value of mg is 10 N and θ = 45⁰)
= 7.07 N
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The frequency of a wave increases. What happens to the distance between successive crests if the speed remains constant?
a) it remains the same
b) it increases
c) it decreases
d) it cannot be determined from the information given
Answers
When the frequency of a wave increases and the speed remains constant, the distance between successive crests decreases. Option c.
A wave is a disturbance that propagates through a medium. The medium is a substance or region through which a wave can propagate. A wave transfers energy without transferring matter. A wave can be defined as a disturbance that moves through space, transporting energy from one point to another. A wave is characterized by its frequency, amplitude, wavelength, and velocity.
The frequency of a wave is the number of waves passing a fixed point in a given time. It is measured in hertz (Hz). The wavelength of a wave is the distance between two successive crests. The velocity of a wave is the distance traveled per unit time.
In this case, when the frequency of a wave increases and the speed remains constant, the distance between successive crests decreases. Therefore, the answer is c) it decreases.
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A car advertisement states that a certain car can accelerate from rest to 70 km/s in 7 seconds. Find the car’s average acceleration.
Answers
Please find attached photograph for your answer. Please do comment whether it is helpful or not.
tell whether the entropy changes, δs, for the following processes are likely to be positive or negative a.the conversion of liquid water to water vapor at 100 ∘c(b) The freezing of liquid water to ice at 0°c (c) The eroding of a mountain by a glacier
Answers
(a) The conversion of liquid water to water vapor at 100 ∘c is likely to be positive.
(b) The freezing of liquid water to ice at 0°c is likely to be negative because the molecules.
(c) The eroding of a mountain by a glacier is likely to be positive because the process increases the disorder of the system by breaking down large, organized structures into smaller, disordered pieces.
(a) The conversion of liquid water to water vapor at 100°C: The entropy change, δS, is likely to be positive because the water molecules become more disordered when they transition from the liquid to the vapor state.
(b) The freezing of liquid water to ice at 0°C: The entropy change, δS, is likely to be negative because the water molecules become more ordered when they transition from the liquid to the solid state.
(c) The eroding of a mountain by a glacier: The entropy change, δS, is likely to be positive because the process leads to increased disorder as the mountain material is broken down and dispersed.
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Which term refers to how loud or soft a sound is ?
A.Wavelength
B.Pitch
C.Volume
D.Speed
Answers
The term refers to how loud or soft a sound will be wavelength. Then the correct option is A.
What is the wave?In physics, math, and related fields, a wave is a dynamic disturbance of one or more variables that spreads. Waves are referred to as periodic when they oscillate repeatedly around an equilibrium value at a specific frequency.
The wave can be represented as,
f(x) = A sin (ωt + ∅)
Where 'A' is the amplitude, 'ω' is the frequency, 't' is the time period, and '∅' is the phase difference.
Depending on the medium that it is moving through, sound has a wide range of speeds. The stiffness of the medium (or compressibility in the case of gases) and its density work together to define the speed of sound in that medium. The speed of sound increases with the rigidity (or lack of compressibility) of the medium.
If the amplitude is high then the voice is loud. Similarly, if the amplitude is low then the voice is soft.
The wave
The phrase describes a sound's wavelength, or how loud or soft it will be. Then, choice A is the best one.
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You place a box weighing 360.6 N on a inclined plane that makes a 39.5 angle with the horizontal
Compute the component of the gravitational force acting down the inclined plane. Answer in units of N
Answers
Answer:
467N (3sf)
Explanation:
360.6/cos(39.5) = 467.3257019
How many significant figures in 0.00850
Answers
Answer:
5
Explanation:
Bibek went to the swimming pool. he saw the pool to be shallower and is redy to jump into the swimmingpool . is it proper for him to jump? if not why ?
Answers
Answer:
A swimming pool appears shallower than it really is due to the phenomenon of REFRACTION. Due to refraction, from rarer medium( Air ) to denser medium ( water ), the pool looks shallower
Explanation:
Which bulb produces a wave with the highest frequency?
Answers
Answer:
UV Light I think, sorry if I'm wrong
Rennata Gas is driving through town at 25.0 m/s and begins to accelerate at a constant rate of -1.0 m/s². Eventually Rennata comes to a complete stop. Represent Rennata's accelerated motion by sketching a velocity-time graph. Use kinematic equations to calculate the distance which Rennata travels while decelerating. Then use the velocity-time graph to determine this distance. PSYW.
Answers
The correct answer is d = 312.5 m.
These formulas are used to describe an object's linear motion. Positive acceleration is present if the thing accelerates.
The equations utilised are as follows:
v = u + at
d = ut + 0.5 at^2
v^2 = u^2 + 2 ad
initial velocity u = 25 m/s
acceleration a = - 1 m/s^2
V is equal to zero in the end.
Let d represent the distance covered.
Now, with the third motion equation,
v^2 = u^2 + 2ad
0 = 25^2 - 2 × 1d
d = 312.5 m
The area between the line on the graph and the time axis can be used to calculate the distance travelled.
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FAILURE OF THE PRODUCT Instructions 1. Select THREE from everyday below items from the list and discuss the way this item can potentially fail (list minimum THREE failures). Justify your answer by considering Load Strength graph and what can be done to prevent those failures. -Ball Pen -Room Key - Blender
Answers
The three product which can be potentially fail considering Load Strength graph and precautionary measure to prevent failure are as below;
Ball Pen:
1. Ink Leakage: One potential failure of a ball pen is ink leakage. This can occur due to poor sealing between the ink reservoir and the ballpoint mechanism. Ink leakage can result in messy hands, stained documents, and reduced functionality of the pen. To prevent this failure, manufacturers can improve the quality control process to ensure proper sealing and use high-quality materials for the pen's components.
2. Ballpoint Jamming: Another failure is ballpoint jamming, where the ball gets stuck and prevents smooth writing. This can be caused by a buildup of dried ink or debris inside the pen's mechanism. To prevent ballpoint jamming, regular cleaning and maintenance of the pen can be recommended. Additionally, manufacturers can design the pen with features that facilitate easy cleaning or provide instructions on how to clear any blockages.
3. Weak Barrel Construction: The barrel of the pen may also be prone to failure if it is weak or brittle. Excessive pressure or rough handling can lead to cracks or breakage, rendering the pen unusable. To prevent this, manufacturers can use durable materials for the pen barrel, such as sturdy plastics or reinforced metal, and perform quality checks to ensure structural integrity.
Room Key:
1. Keycard Malfunction: A potential failure of a room key is a malfunction in its electronic components. This can result in the keycard being unreadable by the door lock system, preventing access to the room. To prevent this failure, regular maintenance and replacement of keycard readers can be implemented. Additionally, guests should be advised to keep their keycards away from magnets and electronic devices that can interfere with the card's functionality.
2. Magnetic Strip Damage: Another failure can occur if the magnetic strip on the keycard gets damaged or demagnetized. This can happen due to exposure to magnetic fields or physical damage. To prevent this failure, keycards can be made more durable with protective coatings or alternative technologies such as RFID. Guests should also be educated on proper handling and storage of keycards to avoid damage.
3. Battery Drain: Some room keys use batteries to power their electronic components. A failure can occur if the battery drains, leading to an inactive keycard. To prevent this, low-power consumption designs can be implemented, and regular battery checks or replacements can be carried out by hotel staff. Guests should be informed about the importance of returning the keycard to the front desk for recycling or proper disposal to ensure the battery is replaced as needed.
Blender:
1. Motor Burnout: One potential failure of a blender is motor burnout due to prolonged use or overloading. Continuous operation at high speeds or attempting to blend hard or frozen ingredients beyond the blender's capacity can cause the motor to overheat and fail. To prevent motor burnout, manufacturers can provide clear guidelines on the maximum load capacity and recommended usage durations. Automatic thermal protection mechanisms can also be incorporated to shut off the blender if it detects excessive heat.
2. Blade Jamming: Another failure can occur if food particles or ingredients get jammed between the blender's blades, preventing them from spinning freely. This can happen if the blender is not properly cleaned or if ingredients are not adequately prepared before blending. To prevent blade jamming, users should be advised to clean the blender thoroughly after each use and ensure that ingredients are cut into manageable sizes. Manufacturers can also design blades with accessible mechanisms for easy cleaning or provide cleaning tools.
3. Leakage: A failure in a blender can also manifest as leakage. This can happen if the blender jar or its sealing components are damaged or improperly assembled. Liquid or food can leak out during blending, resulting in a messy and potentially unsafe situation. To prevent leakage, manufacturers should ensure proper sealing mechanisms and use high-quality materials for the blender jar and lid. Regular inspection of the sealing components can be advised,
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Developed countries typically have _______.
Answers
Answer:
Good government
Explanation:
Many people will think its natural resources but its not. Africa is a proof. They have resources but leadership is what makes most of their countries 3rd world. #BADGOVERNANCE
Explain why people who use the drug in the following scenario might have potential health risks.
Steve is a principal investigator at Live Pharmaceuticals, Inc., and is working on a new drug. He tells a coworker, “Never mind the exact content of the essential ingredient. The ingredient quality does not matter. Just ensure the drug doesn’t exceed the weight limit.”
Answers
Answer:
People who may take this drug may have potential health risk because there is poor quality in that drug just because a drug doesn't exceed the weight limit doesn't mean quality doesn't matter quality matters just as much as the weight limit does
Explanation:
Answer:
People who may take this drug may have potential health risk because there is poor quality in that drug just because a drug doesn't exceed the weight limit doesn't mean quality doesn't matter quality matters just as much as the weight limit does
Explanation: