capture, amplify, and demodulate waves
Question is incomplete and image is not attached in the question. The required image is attached below, so the complete question is:
What is the role of the part in the diagram labeled Y?
modulate, amplify, and send out waves
capture, amplify, and demodulate waves
change the amplitude and frequency of waves
change the pulse and phase of waves.
What are Radio wave?An example of electromagnetic radiation is radio waves. The wavelength of a radio wave is substantially greater than that of visible light. Radio waves are widely used by people for communication. Both rectangular and circular antennas are used by this radio tower to send and receive radio frequency energy.
The radio receiver, also known as component Y in the figure, is what captures, amplifies, and demodulates radio waves.
The radio receiver uses an antenna to separate the necessary radio frequency signals and consists of an amplifier to boost the strength of the receiving signal. The information from the modulated wave is ultimately recovered by demodulators found in receivers.
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One of the main forces driving plate tectonics is the dissipation of heat from the mantle, through convection or large scale upwelling and doming. Where does this heat come from?.
The dissipation of heat emanating from of the mantle, through convective or large-scale upwelling and doming, is one of the main mechanisms driving plate tectonics. The Earth's mantle and core contain numerous gases that react to form magma and lava as well as heat.
What is heat dissipation?The procedure by which heat is moved from it's own source to the surroundings, as in the example of the earth layer to the higher layer of the earth above, is known as heat dissipation. There are three possible mechanisms for heat dissipation: conduction, radiation, and convection.
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A train moves from rest to a speed of 25 m/s in 30.0 seconds. What is the magnitude of it's acceleration?
The train accelerates to 25 m/s from rest in 30 seconds. Search for: The train's acceleration. The train accelerates at 0.83 m/s2 after 30 seconds.
How do you determine acceleration?According to the equations a = v/t, acceleration (a) seems to be the product of the variation in velocity (v) and the changes in time (t).
What is the most basic meaning of acceleration?Acceleration is the term for the rate of change in speed. In most cases, but not always, acceleration denotes a shift in speed. The object keeps accelerating because the direction of its velocity is changing even while it travels in a circular motion.
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What describes the speed of a planet traveling in an elliptical orbit around the sun? a. Constant b. Fastest when closest to the sun c. Slowest when closest to the sun d. Fastest when closest to the moon.
The speed of a planet traveling in an elliptical orbit around the sun is b. Fastest when closest to the sun.
ABOUT ELLIPTICAL ORBITThe planets in the solar system revolve around the sun in certain paths called orbits or orbits that are elliptical, not circular.
In ancient times, humans adhered to geocentric understanding. This theory was introduced by the Greek astronomer Claudius Ptolemy in 100-170 AD.
This belief persisted for 1,400 years. According to him, the earth is the center of the solar system. The sun and planets revolve around the earth in a circular path.
Then in 1543, the astronomer Nicolaus Copernicus sparked the Heliocentric model. According to him, the Earth and other planets revolve around the Sun in circular paths. This theory is better than ever. Although, the assumption that the trajectory of a planet's motion is still in the form of a circle.
The planet's orbit is elliptical due to the gravitational interaction between the planet and the sun and other celestial bodies. Johannes Kepler in the 1600s was the first to discuss the shape of planetary orbits.
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Answer: B.
fastest when closest to the Sun
Explanation: plato :3
Hope this helps!
Sonography captures images by using
the speed of a sound and wave reflection
the reflection and refraction of the sound wave
the distance between the receiver and the wave intensity
the wave intensity and sound speed
Sonography captures images by using the reflection and refraction of the sound wave.
The correctoption is B
What is Sonography?Sonography is described as a diagnostic medical test that uses high-frequency sound waves, or ultrasound waves, to create images of tissues, glands, organs, and blood or fluid flow within the body.
Sonography uses a device called a transducer on the surface of the skin to send ultrasound waves and listen for an echo.
The difference between sonography and ultrasound is that an ultrasound is a tool used to take a picture while a sonogram is the picture that the ultrasound generates.
In conclusion, sonography is the use of an ultrasound tool for diagnostic purposes.
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Answer:
Sonography captures images by using the reflection and refraction of the sound wave,
Or B.
Hope this helps!
If I see the star Sirius in the constellation of Canis Major rise at 8 pm tonight, what time will it rise one week from now
Viewed from the same place, it will lag by about 4 minutes per day.
7 days later puts it at roughly 8:28 PM.
A metal sphere as a charge of +2.3 x 10^-6 C and lies 2 meters away from another metal sphere of unknown charge.
If the attractive force present between the spheres is 0.05 N, what is the charge on the second sphere?
The charge is on the second sphere 9.67×10⁻⁶ C.
What is charge?Charge is the product of current and time.
To calculate the charge on the second sphere, we use the formula below
Formula:
Q = Fr²/kq.................. Equation 1Where:
F = Force on both sphereq = Charge on the first sphereQ = Charge on the second spherer = Distance between the spherek = Coloumb's constantFrom the question,
Given:
q = 2.3×10⁻⁶ NF = 0.05 Nr = 2 mk = 8.99×10⁹ Nm²/C²Substitute these values into equation 1
Q = (0.05×2²)/(8.99×10⁹×2.3×10⁻⁶)Q = 9.67×10⁻⁶ CHence, the charge is 9.67×10⁻⁶ C.
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A student gives a quick push to a ball at the end of a massless, rigid rod, as shown in the figure, causing the ball to rotate clockwise in a horizontal circle. the rod's pivot is frictionless.
a. As the student is pushing, is the torque about the pivot postive, negative, or zero?
b. After the push has ended, does the ball's angular velocity:
steadily increase, steadily decrease, hold steady, decrease for a while then hold steady, increase for a while then hold steady
c. Right after the push has ended, is the torque positive, negative, or zero?
The torque about the pivot is positive, after the push has ended the ball's angular velocity will hold steady, right after the push has ended the torque would be zero.
Torque is a measure of force that can rotate an object around a fixed axis. as the ball is moving in the same direction in which the force is applied. So the torque will be positive. After the push has ended the ball will continue to rotate at the constant angular velocity, as the pivot is frictionless, so no opposing force will decrease the angular velocity of the ball. So the ball's angular velocity will hold steady.
After the push has ended, the torque will be zero. Torque is defined as follows:
Torque = force × distance from the rotation axis
The pushing force is zero so the torque will also be zero.
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A mass on a spring undergoes simple harmonic motion. When the mass passes through the equilibrium position, its instantaneous velocity.
A mass on a spring undergoes simple harmonic motion. When the mass passes through the equilibrium position, its instantaneous velocity is maximum.
Simple harmonic motion or SHM is the alternating motion of an object that passes through a certain balance point. SHM has a fixed frequency and amplitude and is periodic, namely movements that occur regularly and are repeated at the same time.
When a spring undergoes simple harmonic motion, the mass accelerates in a direction toward the equilibrium point, then the velocity of the object at the equilibrium point is maximum. The object is accelerating in a direction toward the equilibrium point. Acceleration caused by the force recovered.
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Please help chemistry, I'm stuck
9 mol P4010 forms 36 mol H3PO4, while
51 moles H2O form 34 moles H3PO4.
How many moles of H3PO4 form during
the reaction?
? ] mol H3PO4
Round your answer to the ones place.
Answer:
???
Explanation:
Not sure to which reaction the question refers
but here is the simplest balanced equation
P4 O10 + 6 H2 O ======> 4 H3 PO4
So the answer may be 4 moles
If the reaction is using 9 moles of PO4 and 51 Moles of H2O
the H2O will limit the number of moles of H3PO4 produced to 34 moles this may be the answer the Q is looking for....H2O is the limiting reagent
The number of moles of H3PO4 form during the reaction is 4.
What is meant by limiting reagent ?Limiting reagent of a reaction is defined as the reactant that is being completely used up in the reaction.
Here,
Given that,
The number of moles of P₄O₁₀ = 9
The number of moles of H₂O = 51
If 9 moles of P₄O₁₀ can form 36 moles of H₃PO₄, 1 mole of P₄O₁₀ can form 36/9 = 4 moles of H₃PO₄
The balanced equation for the reaction can be written as,
P₄O₁₀ + 6H₂O ⇒ 4H₃PO₄
From the equation, we can say that 1 mole of P₄O₁₀ and 6 moles of H₂O will form 4 moles of H₃PO₄
H₂O is the limiting reagent of this reaction.
Hence,
The number of moles of H3PO4 form during the reaction is 4.
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A weight suspended from a spring is seen to bob up and down over a distance of 28 cm twice each second. Find the frequency.
Since frequency is the reciprocal of period, the frequency of the spring is 2 Hz
What is Frequency ?Frequency can be defined as the number of complete revolution per second made by a vibrating body.
Given that a weight suspended from a spring is seen to bob up and down over a distance of 28 cm twice each second.
This means that its Period T = t/n
Where
t = time taken = 1 sn = number of oscillations = 2T = 1/2 = 0.5 s
Frequency is an inverse of period. That is,
F = 1/T
F = 1/0.5
F = 2 Hz
Therefore, the frequency of the spring is 2 Hz
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Will knows that the gravitational pull of mars is less than the gravitational pull of earth. When he lands on mars, his mass will be 75 kilograms. His weight on mars will be his weight on earth.
Weight of will in mars would be 85N. When he lands on Mars, his mass will be equal to 75 kilograms. His weight on Mars will be less than his weight on Earth.
Would you weigh more or less if you stood on Mars's surface instead of Earth's?Even though the individual would be made out of the same quantity of material, they would only weigh 38% as much as they would on Earth. This is because Mars has less gravitational pull than Earth.
gravitational pull on the surface of Mars = 3.8.
weight on the mars = 75 x 3.8 = 85N.
What creates the attraction of gravity?All objects with mass, including our Earth, really bend and curve spacetime, which is what causes gravity to pull you toward the ground. What you experience as gravity is that curvature. All items on Earth are drawn "downward" by gravity toward the planet's core. The gravitational attraction between two bodies is stronger when their masses are bigger, according to Sir Isaac Newton's Universal Law of Gravitation.
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Will is a scientist. He’s designing a spacecraft that would allow people to land on Mars. Will’s mass on Earth is 75 kilograms. Will knows that the gravitational pull of Mars is less than the gravitational pull of Earth. When he lands on Mars, his mass will be (Less than, Equal to or More than) 75 kilograms. His weight on Mars will be (less than, Equal to, or more than) his weight on Earth.
The free-fall acceleration at the surface of planet 1 is 16 m/s2. The radius and the mass of planet 2 are twice those of planet 1.
The free-fall acceleration at the surface of planet 2 is g = 8 m/s². The result is obtained by comparing the accelerations due to gravity on planet 1 and planet 2.
What is the formula of free-fall acceleration?The free-fall acceleration can be counted by the following formula.
g = GM/R²
Where
g = acceleration due to gravity (free-fall acceleration)G = universal gravitational constantM = mass of an objectR = distance from the center of mass of object.Planet 1 has the free-fall acceleration at its surface of 16 m/s². Planet 2 has the radius and the mass twice those of planet 1.
Find the free-fall acceleration at the surface of planet 2!
If g, M, and R are the parameters of planet 1, let's say g', m, and r are the parameters of planet 2. So,
m = 2Mr = 2RThe acceleration due to gravity on planet 2 is
g/g' = (GM/R²)/(Gm/r²)
g/g' = (M/R²)/(m/r²)
g/g' = Mr²/mR²
g/g' = M(2R)²/(2M)R²
g/g' = 4MR²/2MR²
16/g' = 2/1
g' = 16/2
g' = 8 m/s²
Hence, the acceleration due to gravity on planet 2 is 8 m/s².
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What is the difference between EVs and HEVs?
The main difference between electric vehicles (EVs) and hybrid electric vehicles (HEVs) is the power source.
The differences that stand out between the two in the energy force are:
EVs are powered entirely by electricity, while HEVs combine an internal combustion engine with an electric motor and battery. EVs are more efficient, produce zero emissions, and require less maintenance than HEVs, but may be limited in terms of range and require longer charging times. HEVs are more flexible, as they can switch between the electric motor and internal combustion engine to conserve energy and extend range. However, they also produce emissions and require more maintenance than EVs.Both types of vehicles produce fewer emissions than traditional gas-powered cars and can be more fuel efficient.
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18. A vertical spring has a length of 25cm when a 150g mass is hung from its end and its length is 30cm with 250g hanging from it. What is the spring constant? a) 19.6N/cm b) 19.6n/m c) 109.6N/m d) 19.6N/m e) 19.6N/km
The spring constant of the spring is 19.6 N/m.
The correct answer is option D.
What is the spring constant of the spring?
The spring constant of the spring is calculated by applying the following equation as shown below.
Mathematically, the formula of Hooke's law is given as;
F = kx
where;
F is the applied forcek is the spring constantx is the extension of the springk = F / x
the extension of the spring when the 250 g mass was hung on it is calculated as;
x = 30 cm - 25 cm
x = 5 cm = 0.05 m
The spring constant of the spring is calculated as;
k = ( mg ) / x
where;
m is the additional mass = 250 g - 150 g = 100 gk = ( 0.1 x 9.8 ) / ( 0.05 )
k = 19.6 N/m
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If two identical springs are put in parallel (side by side), what exactly
happens to the overall spring constant? Why?
The springs generate a combination of forces.Therefore, it may be said that when springs are utilized in parallel, their constants add up.
Do springs in parallel experience the same force?In springs the force must be the same. In parallel circuits the sum of all the currents going through each branch must be equal to the total current going into the branches. In parallel springs, the total force from all the springs must equal the total force from the mass.
When springs are connected in parallel the deflection for each spring is?2. Springs in Parallel: In parallel combination, force developed in each spring will be different but deflection in each spring will be equal.
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An amusement park ride consists of a rotating circular platform 7.4 m in diameter from which 10 kg seats are suspended at the end of 1.81 m massless chains. When the system rotates, the chains make an angle of 26.6 degree with the vertical. The acceleration of gravity is 9.8 m/sa). what is the speed of each seat? answer in units of m/sb). if a child of mass 49.1 kg sits in a seat, what is the tension in the chain ( for the same angle)? answer in units of N
The speed of each seat is 4.71 m/sec, if the radius of the rotating platform is 3.7 meter. If a child of 49.5 kg sits in a seat, then the tension in the chain will be 648.4 N.
Mass of each seat, m = 10 kg
Radius of the rotating platform, R = 7.4/2 = 3.7 m
Let the tension in the chain = T₁
Vertical angle made by the chain = 26.6°
There will be two components of the tension in chain. Vertical component of the chain will be balanced by the weight(mg) of the seat.
T×cos26.6 = 10 ×9.81
T = (10×9.81)/cos26.6
T = 109.7 N
Horizontal component of the tension in chain is balanced by the centrifugal force due to the circular motion of radius,
R₁ = 3.7 + 1.81×sin26.6
R₁ = 4.51 m.
Centrifugal force, F = mv²/R₁
(10×v²)/4.51 = 109.7 × sin26.6
(10×v²)/4.51 = 49.12
v² = (49.12 × 4.51)/10
v = 4.71 m/sec
If a child of mass 49.1 sits on the seat, then the total weight on the seat will be, W = (10+49.1) × 9.81 = 579.77 N
This weight will be balanced by the vertical component of the tension in the chain,
579.77 = T×cos26.6
T = 579.77/cos26.6
T = 648.4 N
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The maximum force that can be put on an egg without breaking it has been determined to be 15 N. If the 0.15 kg egg is moving at 10.0 m/s and needs to be brought to a stop. How much time will need to be allowed for it to slow down?
The time it takes to put the egg to rest is 0.1 seconds
What is time?Time is the continued sequence of existence and events that occurs in an apparently irreversible succession from the past, through the present.
To calculate the time it will takes to put the egg to rest, we use the below.
Formula:
t = m(v-u)/F.................... Equation 1Where:
t = Timem = Massv = Final Velocityu = Initial velocityF = ForceFrom the question,
Given:
m = 0.15 kgF = -15 N (Against the direction of motion)u = 10 m/sv = 0 m/s (To rest)Substitute these values into equation 1
t = 0.15(0-10)/-15t = -1.5/-15t = 0.1 secondsHence, the time is 0.1 seconds
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A block with the mass of 14.26kg is on a ramp with an incline of 41 degrees. If the block is stationary, what is the minimum value of the coefficient of static friction? [Please explain to me how you did it, I'm giving you 30 points lol the last two times I've asked ive gotten either no explanation or a link to a calculator...]
The minimum value of the coefficient of static friction between the surface and the stationary block is 0.87.
What is the coefficient of static friction?The coefficient of static friction is equal to the tangent of the angle at which the objects slide.
Mathematically,
μs = tan(θ)where;
μs is the coefficient of static frictionθ is the angle of inclination just before the object begins to slide.Since the block is stationary, the minimum value of the coefficient of static friction will be:
μs = tan(41°)
μs = 0.87
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Calculate the wavelength and energy of light that has a frequency of 1. 5 x 1015 hz.
Answer:
Explanation:
I will assmune that "frequency of 1. 5 x 1015 hz" is actually "frequency of 1. 5 x 10^15 hz"
The wavelength and frequency of light are related by the expression C = λ f , where C is the speed of light (3x10^8 m/s), λ is the wavelength (in m), and f is the frequency (in 1/sec or Hz).
C = λ f
(3x10^8 m/s) = λ (1. 5 x 10^15 sec^-1)
λ = (3x10^8 m/s)/(1. 5 x 10^15 sec^-1)
λ = 2.00x10^-7 m
E=hf, where h is Plank's constant (6.62606957×10-34 J·s)
E = (6.62606957×10-34 J·s)*(1.5x10^15s^-1)
E = 9.94x10^-19 J
A cyclist is rounding a 20-m radius curve at 12 m/s. What is the minimum possible coefficient of static friction between the bike tires and the ground?
The minimum possible coefficient of static friction between the bike tires and the ground is 0.734.
The minimum possible coefficient of static friction is that at which the moving object is on the verge of the stopping state.
Radius of the curve, (R) = 20 m.
Velocity of the cyclist, (v) = 12 m/sec
g = 9.81 m/s²
On a circular curve, the cyclist will experience the centrifugal force(F) which acts outwards. This force is,
F = mv²/R
This centrifugal force(F) is balanced by the static friction force(Fₓ). Which is,
Static friction force = mg × coefficient of static friction(Ц)
mv²/R = mg × coefficient of static friction(Ц)
coefficient of static friction(Ц) = v²/gR
= (12×12)/(9.81×20)
= 0.734
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A load of unknown ma i place in the rear of an 18-wheeler truck. The truck rear hock are intantly compreed 10. 0cm. Conider the hock acting a pring with a pring contant, k = 50,000N/m. What i the ma of the load the 18-wheeler jut picked up?
The mass of the load is 50,000N/m multiplied by 10.0cm, which is 500,000N.
Hooke's law states that the force (F) required to extend or compress a spring by some distance (x) scales linearly with respect to that distance—that is, Fs = kx, where k is a constant factor characteristic of the spring (i.e., its stiffness) and x is small in comparison to the total possible deformation of the spring.
B. Using Hooke's law, F = kx, where F is the force of the truck's hock, k is the spring constant, and x is the compression of the hock. Rearranging for mass, m = F/g, where g is the acceleration due to gravity. Thus, m = kx/g, or m = (50,000N/m * 10.0cm)/9.8m/s^2, which yields 500,000N.
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Help me out here please
The displacement is calculated to be a magnitude of 2,691.33 in a direction of 5.32.
What does physics mean by displacement?The term "displacement" refers to a shift in an object's location. It is a vector quantity with a magnitude and direction. The symbol for it is an arrow pointing from the initial location to the ending place.
What distinguishes distance from displacement?Distance is the length of any path connecting any two places. When measured along the shortest path between any two places, displacement is the direct distance between them.
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Convert 3600 s to hr
show all work please and thank you! (SHOW ALL WORK) thanks<3 ill give brainlist
To convert time to hours from seconds, you have to divide the total seconds by 3600.
[tex]\dfrac{3600}{3600} =\texttt{1 hour}[/tex]
3600 seconds would be 1 hour.
67. Resultant Force Forces with magnitudes of
85 pounds and 50 pounds act on a single point at angles
of 45° and 60°, respectively, with the positive x-axis.
Find the direction and magnitude of the resultant of these
forces.
Copyright 2018 Cengage Learning. All Rights Reserved. May not be copied, s
50.545 degrees with a positive x-axis and a weight of 133.909 pounds. the direction and strength of these forces' combined effect
What level of significance is there?A modest but significant amount of a certain characteristic is present in anything if it has a degree of that attribute. However, their salaries do provide them some freedom. There is some cause for cautious optimism.
What does Celsius mean?Degree (Celsius) (Celsius) Temperature readings are frequently made in degrees Celsius. Degrees Celsius are denoted by the sign °C. By designating 0°C as the freezing point of water and 100°C as its boiling point, the Celsius scale is produced.
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Sound waves are examples of
longitudinal waves
transverse waves
electromagnetic waves
tension waves
Answer:
Sound waves are examples of A. or longitudinal waves
How did the heavy elements originate and what did they create?
Heavy elements, such as gold, silver, and mercury, as well as the elements that make up the earth's core, such as iron and nickel, originated in the hearts of stars. They were created through the process of nuclear fusion, which occurs when the temperatures and pressures inside a star are high enough to overcome the electrostatic repulsion between the positively charged nuclei of atoms.
What are heavy element?When fusion occurs, the nuclei of the atoms merge, creating a new, heavier element. This process is called nucleosynthesis. The fusion of lighter elements, such as hydrogen and helium, produces heavier elements, such as carbon, oxygen, and neon.
Therefore, most heavy elements, such as gold and platinum, are created in supernovae, massive explosions that occur when the fuel in a star runs out, and the star collapses under its own gravity. The intense pressure and temperatures that are created during the collapse cause the nuclei of atoms to fuse together, creating elements with atomic numbers higher than iron.
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Which test measures the reaction time of movement?
Posner reaction time test measures the reaction time of movement.
The Posner cueing task, often known as the Posner reaction time test, evaluates the manual and eye-movement reaction times in response to various signals. Particularly following brain damage, this technique is frequently used to evaluate spatial attention.
An eye-level computer screen is placed in front of the individual during the exam. On the screen, there is a point or cross in the middle with two boxes on either side. A target stimulus, such as a shape, then appears on one of the boxes. The individual presses the keyboard of the computer as soon as the target is identified. The response time is measured precisely in this way.
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Convert 250 N to lb show all work please thank you
Convert 250 Newtons to Pounds-Force
250 Newtons (N)
1 N = 0.224809 lbf
=
56.2022 Pounds-Force (lbf)
1 lbf = 4.44822 N
Calculate the change in the kinetic energy (ke) of the bottle when the mass is increased. Use the formula ke = one half. Mv2, where m is the mass and v is the speed (velocity). Assume that the speed of the soda bottle falling from a height of 0. 8 m will be 4 m/s, and use this speed for each calculation. Record your calculations in table a of your student guide.
Kinetic energy is affected by the mass (m) and speed (v) of an object. If an object with mass m moves with speed v, then it can be said that the object has a kinetic energy of:
KE = 1/2 x mv2
In the given problem:
The speed of the soda bottle from a height of 0.8 meters is 4 m/s.
If the mass of the soda bottle is 0.125 kg, the KE is:KE = 1/2 x mv2
KE = ½ x 0.125 x (4)2
KE = ½ x 0.125 x 16
KE = 1 Kgm²/s²
If the mass of the soda bottle is 0.250 kg, its KE is:KE = 1/2 x mv2
KE = ½ x 0.250 x (4)2
KE = ½ x 0.250 x 16
KE = 2 Kgm²/s²
If the mass of the soda bottle is 0.375 kg, the KE is:KE = 1/2 x mv2
KE = ½ x 0.375 x (4)2
KE= ½ x 0.375 x 16
KE = 3 Kgm²/s²
If the mass of the soda bottle is 0.500 kg, its KE is:KE = 1/2 x mv2
KE = ½ x 0.500 x (4)2
KE = ½ x 0.500 x 16
KE = 4 Kgm²/s²
Complete the questions is:
Calculate the change in the kinetic energy (KE) of the bottle when the mass is increased. Use the formula KE = mv2, where m is the mass and v is the speed (velocity). Assume that the speed of the soda bottle falling from a height of 0.8 m will be 4 m/s, and use this speed for each calculation. Record your calculations in Table A of your Student Guide.
When the mass of the bottle is 0.125 kg, the KE is kg m2/s2. When the mass of the bottle is 0.250 kg, the KE is kg m2/s2. When the mass of the bottle is 0.375 kg, the KE is kg m2/s2. When the mass of the bottle is 0.500 kg, the KE is kg m2/s2.Learn more about kinetic energy at https://brainly.com/question/25959744
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Which type of weathering is most evident in the image below?
A. Abrasion
B. Breaking apart by plants.
C. Cracks from temperature changes
D. Ice wedging
Answer:
B
Explanation:
the roots are dig deep into small cracks and crevices, and as they grow they pry the rock apart. look close and you will see the roots of the tree.