Answer:
c is answer
Explanation:
Humans allow only organisms with favorable traits to reproduce. Is this true of natural selection, artificial selection or both? Competition for resources determines reproductive success.
a 3.0-pf capacitor is connected in series with a 4.0-f capacitor and a 48-v battery. what quantity of charge is supplied by the battery to charge the capacitors?
8.2 X [tex]10^{5}[/tex]C quantity of charge is supplied by the battery to charge the capacitors.
[tex]C_{net } = \frac{C_{1} C_{2} }{C_{1} +C_{2} }[/tex]
= [tex]\frac{3\times 4}{3+4}[/tex]
= 12/17
= 1.714μ F
Q = CV
= 1.714x [tex]10^{6}[/tex] F X 48V
= 82.27x [tex]10^{6}[/tex]C
= 8.2 X [tex]10^{5}[/tex]C
What is capacitor?A two-terminal electrical device known as a capacitor is capable of storing energy in the form of an electric charge. It is made up of two electrical wires that are spaced apart by a certain amount. Suction may be used to fill the space between the conductors, or a dielectric, an insulating substance, may be used instead. Capacitance is the term used to describe a capacitor's capacity to hold charges.
Pairs of opposing charges are held apart in capacitors to retain energy. A parallel plate capacitor has the most basic construction and is made up of two metal plates with a space in between them. However, many capacitor types are produced in a wide variety of shapes, sizes, lengths, girths, and materials.
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how much energy must be transferred into 2kg of iron to raise its temperature by 5C?
Answer:
Explanation:
Around 500 volt energy
For a mass on a spring simple harmonic oscillator, the maximum velocity occurs are the point where the spring is.
Position in equilibrium As the mass moves in the direction of x=+A, the greatest velocity occurs so at equilibrium position (x=0).
How do you figure out where equilibrium is?Q can be used to anticipate the direction of a reaction's equilibrium shift. In the event that K > Q, a reaction will proceed and transform reactants into products. If K Q, the reaction will go the other way and convert reactants into products. In the event where Q = K, the system
What occurs when you reach equilibrium?When all forces acting on a mechanical system are equal to zero, it is in equilibrium. Learn how to calculate the equilibrium position of such a mass oscillating on even a spring as well as the factors that influence it on this page.
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What is the Period (T) of this wave?
a. 3.9 cm
b. 0.4 Hz
c. 2.5 sec
d. 1.6 cm/s
The time period of the wave is 2.5 seconds. Option C
How is the duration of a wave defined?
The duration of time it takes for two crests of a single wavelength to pass a specific location is termed as the time period of a wave.Seconds are frequently used to describe the wave period.Since frequency and wave period are inversely proportional, the wave period can be calculated using the following formula:
T = 1/f
T = λ /v
where T is the time period in seconds, f is the wave frequency, is the wavelength in meters, and v is the speed in meters per second.
Time is divided into periods by the quantity of oscillations. Two oscillations are shown in the diagram. By counting the wave's crests one by one starting at the 0s point, this may be seen. Two oscillations end in five seconds. 2 divided by 5 equals 2.5 seconds.
Hence, Option c) 2.5 is correct.
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what is re, the reynolds number re, for water flows at 10 m/s speed through a typical household water pipe of 30 mm diameter? viscosity of water is 8.90 x 10-4 pa.s.
To learn the viscosity and speed and resistance to calculate the diameter.
What is viscosity?
Viscosity is a fluid's (liquid or gas) resistance to a change in shape or motion of adjacent parts concerning one another. Viscosity indicates resistance to flow.
What constitutes speed?
The speed of a change in an object's position in any direction Speed is defined as the ratio of distance to the amount of time it takes to cover that distance. Since speed has only a direction and no magnitude, it is a scalar quantity.
Resistance AC circuit
in resistance AC circuit the voltage and current are related as,
Emf; E= EoSinωt
where, I_O=E_O/R
In purely resistive circuit, there is no phase change occurs. the phase angle between voltage and current is zero.
the maximum value of current is I_0 =v_0\R
if tha maximum volatge v_0 is increase with decrease of resistance R then current in the circuit will maximum and denoted asI_0
capacitive AC circuit
In capacitive AC circuit the voltage and current are related as,
Emf: E=E_Osinωt
and current I =I_Osinωt
⇒ I =I _0sin(ωt+π/2)
where,I_0 =E_0/X_C
in purely capacitive circuit, current leads the end by phase of π/2. the phase angle between volatge and current is π\2
The maximum value of current is,I_0 =E_0\X_C
if the maximum voltage E_0 is increases with decreases of capacitive X_c then current in the circuit will maxmium and denoted as I_0
when the emf is zero then current is maximum magnitude.so the current is maxmium before it leads or lag in the circuit.
inductive AC circuit:
Inductive AC circuit the voltage and current are related as
Emf: E= E_0sinωt
And current : I= (-)I_0cosωt
⇒ I= I_0sin(ωt -π/2)
where, Iπ_0 =E_0/X_L and x=∈L
In purely inductive circuit, the current lags behind the voltage (emf) by phase of π/2. The phase angle between volatge and current is π/2
The maximum value of current is, I_0 = E_0/X_L
if the maximum voltage E_0 is increase with decrease of inductive resistance X_L then current in the circuit will maximum and denoted is I_0.
Therefore, the emf is zero then current is maximum magnitude. so the current is maximum before it leads or lag in the circuit.
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if the height of the mercury column in the leveling bulb is 10 mm greater than that in the gas buret and atmospheric pressure is 670 mm, what is the pressure on the gas trapped in the buret? (hint: raising the leveling bulb, increases the p on the gas)
The pressure on the gas trapped in the buret is 680 mm.
The air around you has weight, and it presses against everything it touches. That strain is referred to as atmospheric pressure or air pressure. it's miles the force exerted on a surface by way of the air above it as gravity pulls it to Earth. Atmospheric strain is normally measured with a barometer.
Atmospheric pressure strain is the pressure exerted via the air around us while Atmospheric stress is the stress exerted by means of the environment on the earth. Air pressure is measured with the aid of a tore gauge while atmospheric stress is measured with the use of a mercury barometer.
Given;
If the height of the mercury Column in the leveling bulb is 10 mm greater than the gas buret and the atmos[pheric pressure is 670 mm.
The pressure on the gas trapped in the buffet = 670 + 10
= 680 mm
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cellular phones use radio waves to transmit information. if your cell phone uses a frequency of 1900 mhz, what is the wavelength of the electromagnetic radiation emitted by your phone?
With wavelengths of around 10-1000 m, radio waves used by cell phones to communicate with cell towers are far too big to be ionizing. In reality, WiFi runs at very specific frequencies, 2.4 GHz or 5 GHz, which correspond to wavelengths of 12 cm or 6 cm, respectively.
What kind of electromagnetic wave is utilized for mobile phone call transmission?Since radiofrequency waves are electromagnetic fields rather than ionizing radiation like X-rays or gamma rays, they cannot ionize or destroy chemical bonds in living organisms.
The signal is transformed back into the data that was first sent by the transmitter when the radio waves reach a receiver. Your voice is sent through radio waves to the person you are contacting when you use a cell phone as a transmitter.
The primary means of communication between mobile phones and neighboring cell towers is through RF waves, an electromagnetic spectrum energy type.
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A 90.0 gram mass is 75 centimeters from the pivot point on a balance scale. What mass must be placed 45
centimeters from the pivot to create rotational equilibrium?
Answer:
Explanation:
Given:
m₁ = 90.0 gram = 0.090 kg
L₁ = 75 cm = 0.75 m
L₂ = 45 cm = 0.45 m
__________________
m₂ - ?
Lever balance (rule of moments):
M₁ = M₂
F₁·L₁ = F₂·L₂
m₁·g·L₁ = m₂·g·L₂
m₁·L₁ = m₂·L₂
Mass:
m₂ = m₁·L₁ / L₂
m₂ = 0.090·0.75 / 0.45 = 0.150 kg or 150 gram
what phase is the moon in when it rises around noon? what phase is the moon in when it rises around noon? third quarter first quarter new full none of the above because the moon always rises around sunset.
First Quarter phase is the moon in when it rises around noon.
When the Moon rises at noon, what phase is it in?During the first quarter phase, the western half of the Moon is illuminated to resemble the letter "D." The Moon rises at noon that day and sets at midnight. When the Moon is in its waxing gibbous phase, it is mostly bright, and the illuminated area is egg-shaped (gibbous), with the eastern edge shadowed.
Lunar phases are the many phases of the moon. The sun's light is reflected by the moon, which does not produce any light of its own. New moons occur when the distant side of the moon is illuminated by sunlight. A new moon is visible when it reflects from a side that is close to it.
The moon goes through eight phases: new moon, waxing crescent, first quarter, full moon, waxing gibbous, third quarter, and declining crescent.
It takes the moon 29.5 days, or roughly one month, to go through all of these phases. This cycle of the moon changing phases is known as the lunar cycle.
Gibbous phases appear when more than half of the moon is illuminated, while crescent phases occur when just half is lighted.
Waxing is an increase in illumination, whereas waning is a reduction.
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suppose the ring rotates once every 5.50 s . if a rider's mass is 51.0 kg , with how much force does the ring push on her at the top of the ride?
The force does the ring push on her at the top of the ride is 489.37N.
What does the word "force" mean?When an object with mass is pushed or pulled, it changes its velocity, according to the definition of force.
Given,
Ring rotates (T) = 5.50 s
Mass m= 51.0 kg
The velocity will now be determined as,
V = 2πr/T
V = 2π8/5.50
V = 50.54/5.50
V = 50.54/5.50
V = 9.134m/s.
By bringing the forces into balance,
N = mv²/R - mg
N = m (v²/R - g)
N = 51(9.134²/8 - 9.8)
N = 51(83.42/8 -9.8)
N = 489.37N
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When energy in a system is transformed, what happens to the total amount of energy in the system?
When the energy in a system is transformed, the total amount of energy in the system is always conserved.
What does it mean when energy is transformed?The changing of one form of energy into another, or the movement of energy from one place to another. An energy transformation is a change of power from one form to another. Fire (Chemical energy Heat and Light) Electric lamp (Electrical energy Heat and Light), Microphone (Sound Electrical energy), Wave power (Mechanical energy Electrical energy). Energy transformation is also known as energy regeneration which is a process of changing energy from one form to another. Energy transformations are procedures that convert energy from one type, for example, kinetic, gravitational potential, and chemical energy.
So we can conclude that an energy transformation is the change of energy from one form to another.
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Help Please! would really appreciate it! THANK YOU!
The time taken for the orange to return is 0.96 s.
How long does it take to return?We know that if an object is thrown up or down that we have to look at the equations of kinematics under gravity so as to be able to obtain the velocity of the object or the time taken.
Now;
v = u - gt
v = final velocity
u = initial velocity
g = acceleration due to gravity
t = time taken.
Thus;
v = 0 m/s at the maximum height so;
u = gt
t = u/g
t = 4.73/9.8 m/s^2
t = 0.48 s
In order to go up and return;
2( 0.48 s) = 0.96 s
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Car a with mass 1,783 kg collides with stationary 1600 kg car b. they become locked together after the collision and move with speed 8 m/s. what was the initial speed of car a?
The initial speed of car A is 15.18 m/s.
Momentum is defined as mass in motion. If there are two objects (the two objects in motion or only one object in motion and the other in stationary) that collide and no other forces work in the system, the law of momentum conservation applies in the system.
p=p'
pa+pb = pa'+pb'
(ma×va) + (mb×vb) = (ma×va') + (mb×vb')
ma = mass of object A (kg) = 1,783 kgmb = mass of object B (kg) = 1,600 kgva = speed of object A before collides (m/s)va' = speed of object A after collides (m/s) = 8 m/svb = speed of object B before collides (m/s) = 0 m/svb' = speed of object B after collides (m/s) = 8 m/sp = momentum before collision (Ns)p' = momentum after collision (Ns)(ma×va) + (mb×vb) = (ma×va') + (mb×vb')
(1,783×va) + (1,600×0) = (1,783×8) + (1,600×8)
(1,783×va) + 0 = 14,264+12,800
(1,783×va) = 27,064
[tex]va \:=\: \frac{27,064}{1.783}[/tex]
va = 15.18 m/s
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(a) what is the resistance of a lightbulb that uses an average power of 40.0 w when connected to a 60.0-hz power source having a maximum voltage of 170 v?
The resistance of the light bulb has the power of 40 W is 722.5 ohms
The power of the light bulb = 40 W
The maximum voltage of the lightbulb = 170 V
Therefore, the resistance of the light bulb can be found using the formula,
P = V² / R
where P is the power of the lightbulb
V is the voltage of the lightbulb
R is the resistance of the lightbulb.
Let us re-write the above equation in order to get the value of the resistance,
R = V² / P
Let us substitute the known values in the above equation, we get
R = (170)² / 40
= 28,900 / 40
= 722. 5 ohm
Therefore, the resistance of the light bulb is 722.5 ohms.
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The relationship of kinetic energy is that when ____________ increases or ____________ increases, kinetic energy will increase also.
Answer: thermal energy, density
Explanation:
The relationship of kinetic energy is that when mass increases or velocity increases, kinetic energy will increase also.
Kinetic energy equals half of the product of mass and the square of the velocity. Kinetic energy is the energy that occurs when the body is in motion. The unit of kinetic energy is joule (J). The kinetic energy increases with an increase in mass and the square of velocity.
The kinetic energy also increases with an increase in the thermal energy of the particles. When the temperature increases, the average kinetic energy also increases and hence, the thermal energy of the molecules also increases. The kinetic energy increases with the decrease in density or volume of the object.
Hence, Kinetic energy increases with an increase in the mass of the object and the velocity of the object.
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given a round object (sphere, disk, hoop for example), doubling only the radius of the object changes its moment inertia by a factor of:
Using the concepts of moment of inertia, we got that moment of inertia increases by 4 times for all round object (sphere, disk, hoop for example) on doubling only the radius.
We know very well that, moment of inertia of the following object are
Moment of inertia of sphere=(2/5)mr²,Moment of inertia of disk =(1/2)mr²Moment of inertia of hoop =mr²where m is the mass of the object and r is the radius of the object.
We see that moment of inertia is directly proportional to the radius of the object.
It means when we double the radius, then moment of inertia increases by 4 times of its previous value.
Hence, a round object (sphere, disk, hoop for example), doubling only the radius of the object changes its moment inertia by a factor of 4 times.
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An aeroplane lands on a runway at a speed of 180 km/hr and is brought uniformly in 30 seconds.what distance does it covers on the run way before coming to rest
This can be calculated by using motion equations, The distance covered on the runway before coming to rest
Initial speed is 180 km/hr = 50 m/s
time took to come to rest is = 30 sec
so we can write, here we are assuming that there is no frictional force is applied externally or internally to the system.
u = 50 m/s
v = 0 m/s
t = 30 s
we know that distance travelled = x
so, x =
putting the appropriate values, we get that
x = [tex](\frac{50+0}{2} ) 30[/tex]
x = 750 m
Hence the distance travelled before coming to rest is 750 m.
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How does the
gravitational attraction
between people
compare to the gravitational
attraction between the
people and Earth?
Attraction between people is Gravitation while people and earth is Gravity.
Every body in the universe attracts every other body with a force called force of gravitation. The attraction between sun and earth , attraction between table and chair lying in a room ..etc. are examples of gravitation. Gravitation is the weakest of four basic forces in nature. However , its most important force as it has its contribution in initiating the birth of stars and controlling the structure and evolution of entire universe.
Gravity is the special case of gravitation. If one of the attraction body is earth then gravitation is gravity.
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Question 8
The scientist mixed a substance A into water. After mixing the substance the scientist
saw that most of the substance did not dissolve making the solution supersaturated.
The scientist wrote a conclusion on his experiment and noted that he put to much solute
in his solvent. Which of the following substances should the scientist use less of next
time substance A or water?
O Water
3 pts
O Substance A
O Solution
Answer:
It is likely water
Explanation:
Due to an average medium PH level it doesn't dissolve much.
A person shakes a sealed, insulated bottle containing coffee for a few minutes. What is the change in the temperature of the coffee?.
A person shakes a sealed, insulated bottle containing coffee for a few minutes, then the change in the temperature of the coffee increases slightly.
What happens when insulated bottle with coffee is shaken?The temperature of the coffee increases when insulated bottle is sealed and shaken because the exchange of heat from the surrounding from the thermos bottle is zero. From the first law of thermodynamics, the work done on system is equal to the change in internal energy.
As thermos flask is insulated, therefore no heat energy is added to the system,
Therefore, △Q=0
Work is done by shaking it against viscous force.
Now, △w=−ve
Internal energy , △U=△Q−△w=0−(−△w)
△U=+△w
So, △U=+ve
Hence, temperature of the system increases due to the increase in internal energy.
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when an object is moving in a circle at constant speed, its acceleration is a. constantly increasing b. constant in direction
The acceleration of an object is moving in a circle at constant speed is just constant (or constant in magnitude). It is not constant in direction nor constantly increasing.
What is acceleration?Acceleration in physics is defined to be the rate of change of the velocity of an object with respect to time. Acceleration, including centripetal acceleration, is a vector quantity because it has magnitude as well as direction. Objects that are changing speeds or changing directions (or changing both) are said to be accelerating.
Centripetal acceleration is the acceleration of a body traversing a circular path. It is equal to velocity squared over radius. Since an object traveling on a circular path is constantly changing directions, even at constant speed, the object is accelerating as well.
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What is the magnitude of the gravitational force between an electron and a proton separated by a distance of 1.0 x 10-10 meter?
A proton and electron separated by 1.0 x 10-10 meters exert 1.0 x 10-47N of gravitational force on each other.
What exactly is gravitational, in simple terms?The gravitational force will bring together any two mass-containing objects. The gravitational force is described as attracting because it consistently tries to draw masses together and never tries to push them apart. In reality, you and every other item in the universe are pulling toward one another.
What is the origin of gravity?
All of the mass on Earth is what creates gravity. The cumulative gravitational attraction of all of its mass exerts pressure on all of the body's mass. Your weight is determined by that. Furthermore, your weight would be lower if you were on a planet with a lower mass than Earth.
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at a location in europe, it is necessary to supply 1000 kw of 60-hz power. the only power sources available operate at 50 hz. it is decided to generate the power by means of a motor- generator set consisting of a synchronous motor driving a synchronous generator. how many poles should each of the two machines have in order to convert a 50-hz power to 60 hz?
The number of poles that the two machines should have in order to convert a 50-hz power to 60-hz is a 10 pole synchronous motor must be coupled to a 12-pole synchronous generator.
n = 120 f / P
n = Speed of synchronous machine
f = Frequency
P = Number of poles
For motor,
f = 50 Hz
n = 120 * 50 / Pm
For generator,
f = 60 Hz
n = 120 * 60 / Pg
To accomplish the frequency conversion, the speed of the motor and generator must be equal. So,
120 * 50 / Pm = 120 * 60 / Pg
Pg / Pm = 6 / 5
Pg / Pm = 12 / 10
Therefore, to accomplish the frequency conversion, a 10 pole synchronous motor must be coupled to a 12 pole synchronous generator.
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a piston has an external pressure of 11.0 atm . how much work has been done in joules if the cylinder goes from a volume of 0.160 liters to 0.570 liters? express your answer with the appropriate units.
Work done by the system is calculated to - 456.863 J, when pressure and volume change is given.
What is work done when pressure and volume change is given?For a gas, work is the product of the pressure and the volume during a volume change. Relationship between pressure and volume can be found out by Boyle's Law. As the pressure on a gas increases then the volume of the gas decreases because the gas particles are forced closer together.
W= -p ΔV
p is pressure and ΔV is volume change
Given that volume changes from 0.160 liters to 0.570 liters
ΔV = 0.570 - 0.160
= 0.41 L
Given p = 11 atm
Now, W = -11 * 0.41
As 1 atm L = 101.3 J
Hence W= -11 * 0.41 * 101.3
Work = - 456.863 J (work done by system)
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two tugboats pull a disabled ship. each boat exerts a constant force of 1.80x106n, on 20 degrees west of north and the other 20 degrees each of north. they pull the ship 0.75km toward the north. what is the total work done on the ship? do not include units.
The force exerted continuously on a specific object in a direction parallel to the direction of the acceleration caused in the body is referred to as a constant force.
Explain about the constant force?A massive body will accelerate or alter its velocity at a constant rate when a constant force is applied to it, according to Newton's second law. In the simplest case, when a force is applied to an object at rest, the object accelerates in the direction of the applied force.
In order to verify that the physical equations are valid, we employ a set of fundamental invariant values called physical constants. These constants are mostly seen in nature and in broad physical study.
The force of gravity is an excellent illustration of a constant force. An object's mass times its gravitational acceleration on Earth always equals the force of gravity acting on that object (9.81ms2 9.81 m s 2 ).
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a car moving at a constant speed of 30 m/s travels rounds a circular bend. as the car rounds the bend, it experiences a centripetal acceleration of 40.0 m/s2. what is the radius of curvature of the bend?
The radius of curvature of the bend 53.33 m N
What is curvature's radius?centripetal acceleration of 40.0 m/s2 and speed of 30 m/s
[tex]f = \frac{mv^{2} }{R}[/tex]
so
40.0 m/s2 / 30 m/s
[tex]\frac{40^{2}m }{30}[/tex] = 53.33 m N
The radius of curvature of the bend 53.33 m N
Centripetal acceleration can be calculated using velocity and radius using The formula ac=v2R. Radius is calculated as R=v2ac if velocity and centripetal acceleration are known.The formula for velocity is v=acR The radius of curvature of the bend 1200m/s2The radius of curvature of the spherical mirror is the diameter of the hollow sphere of which it is a part. In other terms, the radius of curvature of a spherical mirror is the distance between its pole and center of curvature.To learn more about curvature's radius refer to:
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radio waves travel at the speed of light, 300,000 km/s. the wavelength of a radio wave received at 100 megahertz is group of answer choices 3.0 m. 300 m. none of these
At 300,000 km/s, radio waves move at the speed of light. At 100 megahertz, a radio wave has a wavelength of 3.0 m.
How do you pronounce wavelength?The space between two successive troughs or peaks of the light wave is referred to as the wavelength of light. The Greek letter lambda (), which stands for it. Consequently, the wavelength is the separation between one wave's crest or trough and the following wave.
Does speed imply wavelength?An electromagnetic wave's wavelength has no bearing on how quickly it moves. There is no difference in the speed of Wave C versus Wave D. Changes in the characteristics of the medium a wave travels through are the only things that can change its speed.
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what is the wavelength (in pm) of an electron with a mass of 9.11 x 10-31 kg and a velocity of 2.963 x 106 m/s aleks
The wavelength of an electron is 215.5nm.
The de Broglie wavelength is calculated in what way?A description of the de Broglie wavelength is as follows:
The formula for wavelength is = h/mv, where h stands for Planck's constant, m for mass, and v for velocity.
The equation p = h/λ, where h is the Planck constant and is the wavelength, expresses the De Broglie relation, which states that there is a correlation between an electron's wavelength and momentum.
The wavelength of a wave is the distance between its two subsequent crests or troughs.
h = 6.62607015 × 10⁻³⁴ joule second.
m =9.11 x 10 ⁻³¹Kg
v = 2.963 x 10⁶m/s
λ = h / ( mv)
λ = 6.62607015 × 10⁻³⁴/9.11 x 10 ⁻³¹×2.963 x 10⁶
λ = 2.155×10⁻⁷
λ = 215.5nm.
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true or false the newton-raphson method will converge very rapidly when close to finding the root of an equation.
When approaching the root of an equation, the Newton-Raphson method will quickly converge. this is a false.
" Root is a mathematical symbol that stands for the square root symbol or square root sign. In words, we call this symbol radical. The various types of symbols that are used to carry out arithmetic operations may have been covered in your math classes. In mathematics, the square root of any number is denoted by the root symbol.
As an illustration, 2 is used to symbolize the square root of 2. Similarly, for other natural numbers like 5, 6, 7, 8, 10, etc., we can write their corresponding square roots as 5, 6, 7, 8, and 10, respectively. The square root that is positive is always represented by this symbol.
Radicand: The number that appears beneath the root is referred to as the radicand, not the square root symbol.
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there are two identical glasses. one glass has a large ice cube. water is poured into both glasses until they are filled to the top. the ice cube floats partially submerged. which glass weighs more?
Neither. The glass without the ice cube has some weight with the glass with the ice cube.
When does the ice cube melt?We hаve аn ice cube of mаss m floаting in the wаter. If it is floаting (in equilibrium), it will hаve to displаce enough wаter to support its weight. How much is thаt? It is just Volume = m/d, where m is the mаss of the ice cube, аnd d is the density of wаter.
Where the ice hаs melted, it turns into a wаter of volume. Volume = m/d exаctly the sаme volume аs it displаced before. So the аdded volume is the sаme, so the level of the wаter will not chаnge.
For more information about the process of an ice cube melting refer to the link:
https://brainly.com/question/3182291
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