Universe in chronological order,Inflation, Separation 2 fundamental forces, Formed subatomic, Nucleosynthesis and Formation of first stars.
Mystics, theologians, philosophers, and scientists can all have different perspectives on the universe. In science, we take the slow approach and only accept claims that can be verified through experiment or observation. The General Relativity Theory, which Albert Einstein developed, explains the relationships between mass, energy, space, and time. Einstein demonstrated how well his theory fits with a homogeneous distribution of matter in space. He made the unquestioned assumption that the universe is static and constant on a grand scale. Alexander A. Friedmann, a Russian theorist, discovered in 1922 that Einstein's universe is unstable and will expand or contract with even the smallest perturbation. Vesto M. Slipher of Lowell Observatory was gathering the initial proof that galaxies are actually separating at the time.
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250 students sit in an auditorium listening to a physics lecture. because they are thinking hard, each is using 125 w of metabolic power, slightly more than they would use at rest. an air conditioner with a cop of 7.5 is being used to keep the room at a constant temperature. What minimum electric power must be used to operate the air conditioner?
The minimum electric power that must be used to operate the air conditioner is 6250 W.
The total students in the auditorium are n = 250
The metabolic power each student is using is p = 125 W
The coefficient of performance ( COP ) of the air conditioner is given as 5 to maintain a constant temperature inside the auditorium.
Let the minimum electric power that must b used to run the air conditioner be P.
We know that
COP = np / P
P = np / COP
= ( 250x 125 ) / 5
= 6250W
So, 6250 W power is the minimum power.
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2.00 mol of the helium is confined to a 2.00-L container at a pressure of 11.0 atm. The atomic mass of helium is 4.00 u, and the conversion between u and kg is 1 u = 1.661 ××10−27 kg. 1)Calculate vrms
use P*V = n*R*T
==> T = P*V/(n*R)
= 11*1.013*10^5*2*10^-3/(2*8.314)
= 134 k
we know,
v_rms = sqrt(3*k*T/m)
v_rms = sqrt(3*1.38*10^-23*134/(4*1.66*10^-27))
= 914 m/s
The root-mean square (RMS) velocity is the cost of the square root of the sum of the squares of the stacking speed values divided via the variety of values. The RMS pace is that of a wave via sub-floor layers of different c programming language velocities along a selected ray route.
The rms speed is at once proportional to the square root of temperature and inversely proportional to the rectangular root of molar mass. for this reason quadrupling the temperature of a given gas doubles the rms pace of the molecules.
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[tex]V_{rms} = 914 m/s[/tex]
Use P*V = n*R*T
=> T = P*V/(n*R)
= 11*1.013*10^5*2*10^-3/(2*8.314 )
= 134 k
we know,
[tex]V_{rms} =[/tex] sqrt(3*k*T/m)
[tex]V_{rms} =[/tex] sqrt(3*1.38*10^-23*134/(4 *1.66*1 ^-27))
= 914 m/s
Helium is a chemical element with symbol He and atomic number.
It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas and the first gas in the noble gas group of the periodic table.
Its boiling point and melting point are the lowest of all the elements. It is the second lightest and second most abundant element in the observable universe (hydrogen is the lightest and most abundant).
Helium is used as a coolant for the Large Hadron Collider (LHC) and superconducting magnets in MRI scanners and NMR spectrometers. It is also used to cool satellite instruments and is used to cool the liquid oxygen and hydrogen that power the Apollo spacecraft.
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2. (5 points) consider the following circuit. find the complex power of the load (consisting of li, c1, and r1). you must show voltage polarities and current directions. l1 2h c1 1f sqrt(2) cos(t) v v1 r1 1ohm load
An electrical circuit is made up of bigger metal sections called planes and embedded metal surfaces called traces on a rigid framework called a printed circuit board.
What Is a Printed Circuit Board?An electrical circuit is made up of bigger metal sections called planes and embedded metal surfaces called traces on a rigid framework called a printed circuit board. The board's metal pads, which connect components to the board's circuitry, are soldered with solder. Components may now be connected thanks to this. One, two, or more circuitry layers can be present on a board.To ensure pure circuitry transmission, circuit boards are constructed with a dielectric core material with limited electrical conductivity, and as necessary, additional layers of metal and dielectric are placed between the core and the interstices. The copper-based metal lines and planes that make up the circuitry are typically employed as the circuit board's standard dielectric material, which is a flame-resistant composite made of woven fiberglass fabric and epoxy resin.
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what direct current will produce the same amount of thermal energy, in a particular resistor, as an alternating current that has a maximum value of 2.45 a? enter the magnitude of the direct current (in units of amps) in the box given below.
To provide the same amount of heating power as an alternating current with a peak value of 3.5 A, a given resistor has to have a direct current running through it of around 2.5 A.
In a series circuit, there is only one channel for electrons to take, hence the current is the same magnitude all the way around the circuit. A series circuit's total current is equal to the current flowing through all of its resistances.
The value of a sinusoidal voltage (or any other time-varying voltagerms )'s value is equal to the value of a dc voltage that generates an equivalent quantity of heat (power dissipation) as a result of the circuit current flowing through a resistance.
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A hyper 3kg squirrel accelerates uniformly from rest to a speed of 15 m/s in 0.7 seconds. Find the
average acceleration of the squirrel.
Answer: 21.4 m/s²
Explanation:
avg. accel. = (Vfinal - Vinitial) / Δt
Vfinal = 15 m/s
Vinitial = 0 m/s
Δt = 0.70 s
avg. accel. = (15 m/s - 0 m/s)/0.7 s = 21.4 m/s²
which factor leads to interference between waves? (2 points) a varying phase relationship between waves similar wave amplitudes unequal wavelengths radiation through different regions
The factor that leads to the interference of the waves is a varying phase relationship between waves.
What is interference of waves?The term interference of waves has to do with the way and manner in which two waves are able to combine. The waves may combine constructively or destructively.
If the waves combine constructively, this implies that the disturbance of the waves is increased but if the wave combines destructively then it means that degree of the disturbance of the waves is decreased.
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Answer:
Similar wave amplitudes
Explanation:
I got it right on the test.
if you are charged with speeding 25 mph or more over the speed limit or at a speed 95 mph or greater
A Class B misdemeanor is committed when a driver exceeds the speed limit by twenty-six (26) to thirty-four (34) miles per hour. Court supervision is an option for sentences.
For a breach of this offence, you may receive a sentence of conditional release, probation, or up to two (2) years of court supervision. a misdemeanor that carries a fine or brief jail sentence as punishment. Common crimes like moving offences are typically adjudicated amicably, without a trial. The New Dictionary of Cultural Literacy, Third Edition Copyright by Houghton Mifflin Harcourt Publishing Company. (felony.) Aggressive driving practice's include speed. The general growth in aggressive driving has been attributed to a number of issues, with traffic congestion being one of the most commonly cited.
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The complete question is -
if you are charged with speeding 25 mph or more over the speed limit or at a speed 95 mph or greater. Which is committed when a driver exceeds the speed limit.
an l-c circuit containing an 81.0-mh inductor and a 1.55-nf capacitor oscillates with a maximum current of 0.780 a. you may want to review (page) . for related problemsolving tips and strategies, you may want to view a video tutor solution of an oscillating circuit. part a calculate the maximum charge on the capacitor. q
The maximum energy stored in the circuit Q = 3.44 × [tex]10^{-8}[/tex]
Umax = L[tex]I^{2}[/tex]max/2 = [tex]Q^{2}[/tex]/2C
L[tex]I^{2}[/tex] /2 = [tex]Q^{2}[/tex]/2C
[tex]Q^{2}[/tex] = LC[tex]I^{2}[/tex]
Q = 0.780 ([tex]\sqrt{81 X 10 ^{-3} }[/tex])([tex]\sqrt{1.55 X 10^{-9} }[/tex])
The maximum energy stored in the circuit Q = 3.44 × [tex]10^{-8}[/tex]
Energy is the quantitative attribute that is transferred to a body or to a physical system. It is recognized in the execution of work as well as in the form of heat and light (from the Ancient Greek: v, enérgeia, "activity"). Energy can be transformed in form but cannot be created or destroyed, according to the rule of conservation of energy. The joule is the SI's (International System of Units) unit of measurement for energy.
A moving object's kinetic energy, a potential energy stored by an object (for instance because of its position in a field), the elastic energy contained in a solid object, chemical energy linked to chemical reactions, radiant energy carried by electromagnetic radiation, and internal energy contained within a thermodynamic system are examples of common forms of energy. Energy is continuously taken in and released by all living things.
Any item that has mass when it is motionless (referred to as rest mass) also has an equivalent amount of energy, known as rest energy. As a result, any additional energy (of any type) that the object acquires above that rest energy will increase the object's total mass as well as its total energy.
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Why does the sound of something moving away from you seem to change to a lower and lower pitch?; What happens when two sound waves meet in constructive interference apex?; In what way are all sound waves and light waves similar?; How is the amplitude of waves affected by destructive interference?
The given situation is because of the phenomena of Doppler's Effect.
How does the sound gets faint ?You may have observed that the pitch of a siren decreases sharply as it passes you at a high rate of speed. When the pitch is higher, the siren first approaches you. The siren is moving away from you and becomes quieter once it has passed you. The Doppler effect is manifested in this way.
The region that the sound waves cover grows as one gets farther from the source of the sound. The intensity and loudness of the sound are reduced because the same quantity of energy is dispersed over a larger region. This explains why, as you get further away from the source, even strong noises start to diminish.
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when you calculate for the heat necessary for a phase change such from water to steam, you don't need a temperature in your calculation. t/f
Yes, the statement is true, that when we calculate for the heat necessary for a phase change we do not need a temperature in a calculation.
The heat required for the state change of a material is given by the formula,
Q = mL
Where Q is the heat required M is the mass of the material and l is the latent heat of the material.
As we can see from the above formula there is no requirement of the change in temperature of the material in order to calculate the necessary heat for the phase change such as water to steam.
It has to be noted here that when we calculate the heat required during the same phase of the material requires the knowledge of change of temperature.
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____ are thick in the middle and thin at the edges concave lenses convex lenses concave mirrors plane mirrors
Following are the four fundamental forces. Rank these forces from left to right based on their relative strengths acting between Earth and the Sun, from weakest to strongest. If you think two (or more) forces have equal strength (or essentially zero strength) in this case, show the equality by dragging one on top of the other(s).
Weak and Strong (on top of each other) are weakest; then Electromagnetism, then Gravity (strongest)
The four primary forces that interact between the Earth and the Sun are gravity, electromagnetic, feeble, and strong, in order of their relative intensities.
Give an illustration of electromagnetism.Radio and TV waves, microwaves, visible radiation, visible light, ultraviolet rays, Cross, and gamma rays are a few examples of electrical waves that travel through space without the aid of matter.
How does electromagnetic induction work? What exactly is it?Electromagnets are made by winding wire coils carrying electricity through them. Since moving charges create magnetic fields, the wire coils inside an electromagnet act like magnets when an electrical discharge passes through them.
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What did Hubble discover about a distant star?; What is Hubble's most famous image?; What do you observe about the stars in the Hubble image?; How many pictures did the Hubble telescope take?
Hubble discovery are Pillars of Creation, Telescope takes more than 4 images, Things farther from Earth were moving away faster.
Hubble made the amazing discovery that a galaxy's redshift exactly correlated with its distance from the earth. That implied that objects farther from Earth were dispersing more quickly. To put it another way, the cosmos must be growing. In 1929, he made his discovery public.
The "Pillars of Creation," three huge cosmic dust and gas trunks that appear in one of the most well-known Hubble images, are officially known as Messier 16 (M16), and they are a component of the larger Eagle Nebula (opens in new window).
Many contenders for the most distant galaxy ever detected have been found in the 2009 infrared picture of the Hubble Ultra Deep Field, which has proven an extraordinarily rich hunting field for astronomers who study the early Universe.
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Near Los Angeles, the sea breeze front
A. separates marine air from polluted air.
B. leads to lowering pollution in the eastern portion of the Los Angeles basin in the late afternoon.
C. does not affect the concentrations of photochemically generated smog components.
D. moves farther off-shore as the day progresses.
separates marine air from polluted air
The correct option is A. Near Los Angeles, the sea breeze front separates marine air from polluted air.
Los Angeles has a subtropical climate with very mild, relatively rainy winters and hot, sunny summers.
It has a similar climate to the Mediterranean, but it is even milder. In fact, because the city is located at a lower latitude than the Mediterranean coasts, it has milder winters; however, because it is located on the Pacific coast, where a cool current flows, summer is slightly cooler than in the Mediterranean Sea.
However, different microclimates exist depending on location, as the city covers a large area, is located on the coast, but is also surrounded by hills and mountains.
The city is heavily polluted, and pollutants can build up in the air, especially during the dry season.
Thus, the breeze flowing towards the los angeles from sea, helps in separating air from the pollutants.
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a researcher is interested to find out how the engine displacement, vehicle weight, and the type of transmission [i.e. automatic
Critical value for F test is 2.24 . t-test statistic for 'Displacement is -1.993
The t-test show whether two populations are statistically different from each other. ANOVA show whether three or more populations are statistically different from each other. Both of them uses the difference in means and the spread of the distributions (called variance) across groups.
We get a test statistic value (“t” or “F”, respectively) from t test and ANOVA. The value we get are converted into a “p-value.” A p-value is the probability that the null hypothesis (that both (or all) populations are the same) is true. We can say that, a lower p-value reflects a value more significantly different across populations.
t-test statistic for 'Displacement' = coefficients / standard error = -0.0176/0.00883 = -1.993
We find critical value with given significance level using F distribution table as 2.24
F Critical Value = the value found in the F-distribution table with n1-1 and n2-1 degrees of freedom and a significance level of α.
The question is incomplete. The complete question is
A researcher is interested to find out how the engine displacement, vehicle weight, and the type of transmission [i.e. automatic & manual] affect the automobile gasoline mileage. Type of transmission is represented by one dummy variable: automatic (=1, if transmission is automatic; = 0, if transmission is manual)
Part of the raw data and the regression output of 40 different car models are given below. ( see images).
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question 22 options:convert the following points from polar coordinates into rectangular coordinates.round your answers to the nearest tenth (1 decimal place).required format of answer: give your answer as an ordered pair with no spaces between symbols (-
The equations x is rcos and y is rsin can be used to convert polar coordinates to rectangle coordinates.
What is the procedure for converting a polar coordinate to a rectangle coordinate?The equations x=rcos and y=rsin can be used to convert polar coordinates to rectangle coordinates.Using the equation x=rcos()x = r cos, get the x-coordinate for the point's rectangular coordinate form in step 1. Using the equation y=rsin() y = r sin, find the y-coordinate for the point's rectangular coordinate form in step 2. (r, +2n) or (-r, +(2n+1)) are possible formulas, where n is an integer. If measured in the other direction, the value of is positive. When calculated anticlockwise, the value of is negative. If laid off at the terminal side of, the value of r is positive.To learn more about polar coordinates refer to:
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What type of energy does the pendulum have when it is hanging straight down?; At which position of a pendulum kinetic energy is maximum?; What point in the pendulum is the potential energy maximum?; Where in the pendulum swings path is the kinetic energy the greatest Where is the potential energy the greatest?
Kinetic energy is the energy that the pendulum have when it is hanging straight down and at the lowest point pendulum is the potential and kinetic energy is maximum.
A simple pendulum consists of a small mass suspended on an approximately massless, non-stretchable string. It is free to oscillate from side to side. The forces acting on the mass are the force of gravity and the tension in the string.
The tension cancels out the component of mg that lies along the string; this keeps the object from accelerating in the direction of the string, and thus keeps the string's length constant.
The net force is simply the remaining component of mg, which is pointed perpendicular to the string and is equal to Fnet=-mgsinФ
The pendulum only has gravitational potential energy, as gravity is the only force that does any work. The total energy of the pendulum is the potential energy at the maximum displacement, when the displacement is equal to the amplitude is 1/2mgLA^2.
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A student measures the speed of sound by echo destiny classes hands and then measures the time to hear the echo his distance to the wall is 300 m The time delay between clap an echo is 1.5 seconds. Calculate the speed of sound
The calculated value of speed of sound be 400 m/s.
What is echo?An echo is a sound produced when sound waves are reflected off of a surface and returned to the listener. It is the sound that has been reflected, and it reaches the listener after the original sound has passed.
Given parameters:
The student's distance to the wall is = 300 m.
The time delay between clap an echo is 1.5 seconds.
In this time, sound waves goes to the wall and hits back to the student's ear.
So, total distance covered by the sound wave: d= 2 × 300 m = 600 m.
Hence, the speed of sound be - 600 m/1.5s = 400 m/s.
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❧ What are the uses of mirrors and other reflecting surfaces?
Mirrors and other reflecting surfaces can be used in the following way; used in kaleidoscopes, periscopes which are widely used in submarines, used in headlights to reflect parallel rays of light in a straight line etc.
What is a mirror?A mirror is a reflecting surface that reflects light almost totally and does not allow it to refract, producing a clear image. It produces either real or virtual images.
Types of MirrorsPlane Mirror - These are made by putting some reflective substance like silver nitrate onto a piece of glass. When we place an object in front of a plane mirror, an image is formed by reflection.
Concave - It is a mirror that is bent inside at its center. The law of reflection also holds for the concave mirror, but the angle of incidence is not equal to the angle of reflection. A concave mirror can produce a real or virtual image in front of it at its point of focus.
Convex - is also called a diverging mirror. The reflective surface of the convex mirror is slightly extended towards the source of light. A convex mirror can reflect all rays falling on it in the outward direction. It produces a virtual image. The size of the image produced by this kind of mirror is smaller than the actual object.
Uses of mirrorsA plane mirror is used in kaleidoscopes. Plane mirrors are also used in periscopes which are widely used in submarines.They are used in headlights to reflect parallel rays of light in a straight line. Convex mirrors are used as side mirrors in vehicles because they form erect images and cover wider views. Plane mirrors are also used in flashlights and torches to give the source light a straight path. They are also used in microscopes to reflect the beam of light. Plane mirrors are used in solar cookers because they excellently reflect solar rays.Learn more about mirrors:https://brainly.com/question/20331340
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gelified acetate-based water-in-salt electrolyte stabilizing hexacyanoferrate cathode for aqueous potassium-ion batteries
In recent years, gelified acetate-based water-in-salt electrolyte stabilising hexacyanoferrate cathode for aqueous potassium-ion batteries has gained popularity.
Here, water activity in "Water-in-salt" electrolytes (WiSE) based on potassium acetate (KAc) is investigated using Raman and classical molecular dynamics (MD), demonstrating the significantly reduced water activity of these WiSEs because water can be efficiently coordinated by both the acetate anion and the potassium cation. It is discovered that the overall molecular arrangement resembles the "sponge-like" shape seen in several ionic liquids. According to comprehensive electrochemical, scanning electronic microscopy (SEM), and X-ray photoelectron spectroscopy (XPS) study, such WiSE can also be compatible with Al current collectors with appropriately adjusted composition. However, due to the limited stability of the cathode material in the alkaline environment, the use of inexpensive potassium manganese hexacyanoferrate (KMHCF) in combination with these electrolytes is hampered by poor cycling performance.
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In an independent-measures experiment with three treatment conditions, all three treatments have the same mean, M1 = M2 = M3. For these data, what is the value for SSbetween treatments?
a. 3(5.50)
b. 0
c. 1.00
d. Cannot be determined from the information given
A is the answer 3(5.50) .Three of the treatment means in a two-factor experiment with two levels of factor A and two levels of factor B are almost identical, while one is significantly different from the others. What outcome (s) would this course of treatment achieve?
When analysing variance, the differences that exist when there are no treatment effects are measured using the variance within treatments. By summing the SS values across all treatments and dividing by the total of the df values across all treatments, this value is obtained. By summing the SS values across all treatments and dividing by the total of the df values across all treatments, this value is obtained. A study evaluating three therapies with a n = 10 sample size
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if we knew how much work was needed to push the car off the cliff in just five seconds, could be calculated.
It is your job to lift the stone from the ground. Carrying a stone in a straight line across the grass at a constant speed doesn't work.
Kinetic energy is directly proportional to the square of the object's mass and velocity. If the mass is in kilograms and the velocity is in meters/second, then the kinetic energy is in kilograms meters squared/second.
Crash Energy Conversion Most of the kinetic energy in the crash process is converted into the internal energy of the vehicle. This is because the internal energy increases significantly due to the plastic deformation of the metal after the collision. Another kinetic energy is converted into heat energy sound energy etc.
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1. When might an ASDS be most useful and why?
2. How do Trappist-E, -F, and -G contrast with Earth?
3. Why is the greenhouse effect significant? Explain your reasoning.
4. Do you agree that humans are contributing to greenhouse gas levels? Explain your answer.
5. When might a rover be useful and why?
ASDA is found to be very proficient at detecting swirls in a variety of synthetic data with various levels of noise, implying our subsequent scientific results are astute.
What is ASDA?Applying ASDA to photospheric observations with a pixel size of 39.2 km sampled by the Solar Optical Telescope on board Hinode suggests a total number of 1.62 × 105 swirls in the photosphere, with an average radius and rotating speed of ∼290 km and <1.0 km s−1, respectively.
Comparisons between swirls detected in Bifrost numerical MHD simulations and both ground-based and space-borne observations suggest that (1) the spatial resolution of data plays a vital role in the total number and radii of swirls detected, and (2) noise introduced by seeing effects could decrease the detection rate of swirls, but has no significant influences in determining their inferred properties.
All results have shown that there is no significant difference in the analyzed properties between counterclockwise or clockwise rotating swirls. About 70% of swirls are located in intergranular lanes.
Therefore, ASDA is found to be very proficient at detecting swirls in a variety of synthetic data with various levels of noise, implying our subsequent scientific results are astute.
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Answer:
When might an ASDS be most useful and why?
Autonomous Spaceport Drone Ships would be helpful when a spacecraft needs to land in the ocean, for example. These prevent the rocket from being damaged by the water. These are typically used when a spacecraft doesn’t have enough fuel to reach its planned landing spot.
How do Trappist-E, -F, and -G contrast with Earth?
Trappist-E, -F, and -G are the planets that orbit in the habitable zone. They all have a high possibility of having water, similar to Earth. These planets are about the same size as Earth but they have about 100 times more water.
Why is the greenhouse effect significant? Explain your reasoning.
Greenhouse gases is likely what has caused the increase of warmth on our planet (global warming). People add to these greenhouse gases and they trap heat. We don’t know exactly what will be the outcome of the rise in these gases, but so far they have largely contributed to global warming.
Do you agree that humans are contributing to greenhouse gas levels? Explain your answer.
Yes, I do agree. People add to the heat-trapping greenhouse gases, like carbon dioxide, methane, nitrous oxide, and chlorofluorocarbons. Methane, for example, is increased when landfills are made of coal is mined, both of which are human activities.
When might a rover be useful, and why?
A rover might be useful when we are exploring places that aren’t safe for people. Another time rovers might be helpful is when we are exploring places that humans literally can’t go to or conduct research on because of what the planet is made out of. Since a rover isn’t human it can’t experience feelings or get hurt (it can be damaged, but that wouldn’t lose a life) therefore, it’s safer to send a rover at least until we can find out if it’s safe or not.
Explanation:
I had to do this in class
there are two equations used to calculate the heat gained/lost by a substance. match each equation to its correct application. heating or cooling during a phase change: q = nΔHochangeheating or cooling within a phase if mass is given: q = msΔT
Phase changes can be accompanied by heating or cooling: q = nHochange, If the mass is known, heating or cooling will occur within a phase. q = msΔT
What does the word "heated" mean?the method or tools used to heat something, especially a building: heating costs/oil/efficiency. A shift in heat is always accompanied by a phase change.
What is heating or temperature?Heat is a measurement of change, never a quality that an item or system possesses. It is categorized as a step input as a result. Temperature can be expressed in Celsius (°C), Kelvin (K), Fahrenheit (°F), or Rankine units and indicates overall average kinetic energy of particles inside a substance or system (R).
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a baseball leaves the bat at 76m/s, 57 degrees above the horizontal. how long is it in the air
So the time taken that the ball stays in the air was found to be 13 seconds.
what is a baseball used for ?
One of the most recognisable and crucial pieces of baseball equipment is the baseball. Every player on the field frequently uses baseballs, which are employed as the game's basic tool. There would be no game if there were no baseballs.
t = vsin∅/g
t = 76 sin 57/9.81
t = 76(0.8387)/9.81
t=63.741/9.81
t=6.497≈6.5
As the time taken for the ball for going up and down will be
2t=(6.5)2
=13
so the time that the ball stays in the air was found to be 13 seconds
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What is the net force on skydiver falling?; What is the net force on a skydiver falling with a constant velocity of 10 m/s downward?; What happens when a skydiver jumps?; What's the highest someone has skydived?
If his velocity remains constant, there will be no net force acting on him since any force acting on him will be precisely cancelled out by a force acting in the opposite direction.
What is the net force that causes skydivers to fall?The falling skydiver experiences an upward push and acceleration. If an object is falling downward and there is an upward net force acting on it, the object will slow down. The skydiver slows down as a result. Once more, the skydiver approaches a terminal velocity as the air resistance diminishes along with the speed.
What is a skydiver's net force when they reach their terminal velocity?ZERO When an object reaches its terminal velocity, the upward force from air resistance and the force of gravity are equal.
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a steel cable supports an actor as he swings onto the stage. the weight of the actor stretches the steel cable.a. both shear modulus and bulk modulus. b. Young's modulusc. bulk modulus.d. shear moduluse. both Young's modulus and bulk modulus.
A steel cable supports an actor as he swings onto the stage. Yhe weight of the actor stretches the steel cable. This is related by Young's modulus. So, the correct option is b.
The ratio of stress applied to the material to the corresponding strain developed within the proportional limit is defined as Young's modulus. It is a measure of stiffness of the material but up to a elastic/proportional limit. From Hooke's law Stress=Y×Strain, where Y is Young's modulus. SI unit of Young's modulus is Pascal. Stress is equal to Force/area and strain is change in dimension/ original dimension. Therefore, it is related by Young's modulus.
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Complete question- A steel cable supports an actor as he swings onto the stage. The weight of the actor stretches the steel cable. To describe the relationship between stress and strain for the steel cable, you would use a) both shear modulus and bulk modulus. b) Young's modulus. c) bulk modulus. d) shear moduluse e)both Young's modulus and bulk modulus
An SUV's engine provides 3500 N of force for a vehicle that has a mass 2000 kg. If an engineer develops a new chassis for the SUV that is two times the mass, what is the acceleration of the vehicle with the new chassis?
A. 0.88 m/s^2
B. 5.7 m/s^2
C. 1.75 m/s^2
D. 1.14 m/s^2
Answer:
A. 0.88 m/s²
Explanation:
Newton's second law:
F = ma
The force is 3500 N, and the mass is 2×2000 kg = 4000 kg.
3500 N = (4000 kg) a
a = 0.88 m/s²
the surface of the water in the rotating tank is perpendicular to the effective gravitational force. the surface force on the mass element due to the rest of the fluid is perpendicular to the surface. the fluid is in static equilibrium in the rotating frame: (part a) use newton's second law in the rotating frame to find an equation for , the angle of the water's surface from the horizontal.
Angular momentum and effective gravitational force about the mass center. For a rigid body rotating on a fixed axis with respect to its center of mass.
How does effective gravity become calculated?The gravitational acceleration g = F / m can also be used to express gravity. Since the acceleration is constant for all masses m, m need not be included in the expression when using the gravitational acceleration instead of the gravitational force.
In fluid mechanics, what does g Effective mean?It should be noted that a brand-new "effective gravity" vector, G, has been established as the vector sum of gravity and the opposite of the acceleration vector. With a little trigonometry, we can calculate the new effective gravity vector, which is the resultant vector of adding g and -a.
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2 forces act concurrently on an object. their resultant force has the largest magnitude when the angle between the forces is 0, 30, 90, 180
When the two forces act towards concurrently about an object, then their resultant kind of force will have the largest magnitude so that the angle among the forces is zero. Option (1).
Let θ₁ and θ₂ be two main angles among the the two forces with the direction of motion.
To maintain the motion in indicated direction, the net force will be,
F = cos θ₁ + cos θ₂
= (cos θ₁ + cos θ₂)
= cos [(θ₁+θ₂)/2] cos[(θ₁-θ₂)/2]
The maximum amount of value of the cosine function is always 1, which occurs when its argument will be zero.
Therefore the maximum value of F occurs when
θ₁ + θ₂ = 0
or
θ₁ - θ₂ = 0
Add the two equations to obtain
2 θ₁ = 0 => θ₁ = 0
Also, θ₂ = θ₁ = 0.
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Correct Question:
Two forces act concurrently on an object. their resultant force has the largest magnitude when the angle between the forces is
1. 0
2. 30
3. 90
4. 180
