The statement " mechanical waves move through a medium, particles of the medium undergo a periodic and repeated vibration about a fixed position." is TRUE.
Mechanical waves are waves that require a medium for their propagation, such as sound waves in air, seismic waves in the Earth's crust, or ocean waves on the surface of water. These waves are generated by a source that causes a disturbance in the medium, and the energy of the wave travels through the medium by causing the particles to vibrate periodically and repetitively.
For example, when a sound wave passes through air, the particles of air undergo a periodic and repeated vibration about a fixed position, compressing and expanding as the wave passes through. These vibrations cause the energy of the sound wave to be transferred from one particle to the next, allowing the wave to propagate through the medium. The same process occurs in other mechanical waves, with the particles of the medium vibrating about a fixed position as the wave travels through.
It's important to note that the particles of the medium do not move along with the wave, but rather undergo a periodic vibration about their fixed position. The wave itself is a disturbance that travels through the medium, transferring energy from one point to another, but the medium particles do not move with the wave.
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an escalator in a shopping center is designed to move 97 people, 71kg each, at a constant speed of 0.4m/s at 30 degree slope. determine the minimum power input needed (in kw) to drive this escalator.
The minimum power input needed to drive the escalator in a shopping center is designed to move 97 people, 71kg each, at a constant speed of 0.4m/s at 30 degree slope = 1,377.4 W
The power of something can be calculated by dividing the amount of work it has completed by the amount of time it took to complete that task. This is the general concept of power; the formula might vary in different situations.
P = E/t is the equation .
Where P stands for power
E for energy,
And t for time in seconds.
According to this equation, power is the amount of energy consumed per unit of time.
Hence, the minimum power needed by the escalator:
P = E/t
= (mg) (v sin 30⁰)
= (97 x 71) (0.4 x ½)
= 1,377.4 W
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5. The temperature of air in a foundry increases when molten metals cool and solidify. Suppose 4.5 x 10^7 J energy is added to the surrounding air by the solidifying metal. The air's temperature increases by 55°C and the air has a specific heat capacity of 1.0 × 10 J/kg °C. What is the mass of the heated air?
The mass of the heated air is 2475000 kg.
What is specific heat capacity?The heat capacity of a sample of a substance is equal to the mass of the sample divided by the specific heat capacity of the substance (symbol c) in thermodynamics.
Informally, it is the quantity of heat that must be added to one unit of a substance's mass in order to raise its temperature by one unit.
The specific heat capacity of air = 1.0 × 10³ J/kg °C.
Hence, the mass of the heated air is =
( 4.5 x 10⁷ × 55) ÷ ( 1.0 × 10³ ) kg
= 2475000 kg.
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Red tape is used to fix a broke tailght in one to two sentences explain how different colors of light are transmitted reflected and absorbed by this kind of tape 2point
The colors can be able to pass through if they have the same wavelength while the rest are absorbed.
How are colors transmitted through a material?Colors are transmitted through a material by the selective absorption, reflection, and transmission of light. Different colors of light have different wavelengths and frequencies, and different materials interact with light in different ways.
Some materials, such as a prism, can split light into its component colors, while others, such as a colored filter, can absorb certain colors and allow others to pass through.
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What happen to the force, if both masses are tripled?
If the distance between the two objects doubled and the mass of each object was tripled, the force would increase by a factor of 9 (3*3) and the mass would increase by a factor of 3.
What is force?At this time, it is appropriate to refer to a force as a push or a pull. A force that an object "has in it" or "contains" does not exist. One object experiences a force from another. Living organisms and inanimate objects are both included in the concept of a force. A massed object's velocity can be changed or elevated by a force. A push or a pull are two straightforward ways to demonstrate force. A force is a vector quantity since it has both a magnitude and a direction.
How many types of force are there?both direct force and distant action Two different types of forces exist. It's clear that you utilise force consistently. Forces are just push and pull. You exert force on an object when you push or pull against it.
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What is the wavelength of a wave if it has a speed of 10 meters/second and a frequency of 2 hertz
Important Formulas:
[tex]v=\lambda f[/tex]
velocity(measured in m/s) = wavelength(measured in meters) * frequency(measured in hertz)
__________________________________________________________
Given:
[tex]v=10m/s[/tex]
[tex]f=2Hz[/tex]
[tex]\lambda=?[/tex]
__________________________________________________________
Rearranging formula for velocity to make wavelength the subject:
[tex]v=\lambda f[/tex]
[tex]\dfrac{v}{f} =\dfrac{\lambda f}{f}[/tex]
[tex]\lambda=\dfrac{v}{f}[/tex]
__________________________________________________________
Finding wavelength:
[tex]\lambda=\dfrac{v}{f}[/tex]
[tex]\lambda=\dfrac{10}{2}[/tex]
__________________________________________________________
Answer:
[tex]\boxed{\lambda=5 \texttt{ meters}}[/tex]
a dropped super ball bounces off the ground and comes back up with the same speed. true or false: the ball's velocity just before bouncing was the same as immediately after it bounced.
The statement "a dropped super ball bounces off the ground and comes back up with the same speed" is false because the speed decreases.
There will be a number of shifts, but the most significant shift will be in the momentum of the ball. It demonstrates an abrupt change in the velocity of the ball. Therefore, momentum is the answer.
whoever has the fastest overall average speed wins. This statement is not accurate since a super ball that is placed onto the ground will bounce off of the ground and come back up at the same speed. The velocity of the ball just before it bounced was the same as the velocity of the ball immediately after it bounced.
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if we triple the number of moles in the gas vessel at constant pressure, what would the new volume be?
The new volume would be tripled if we tripled the amount of moles in the gas vessel while maintaining a fixed pressure.
What is moles?They frequently take the form of tiny, dark brown spots and are brought on by clumps of pigment-forming cells (melanocytes). The majority of people have between 10 and 40 moles, which usually form during adolescence and childhood and it may change or disappear over time. Melanocytes are the type of cells that make up moles. Our skin contains several melanocytes, which are the cells responsible for producing the pigment melanin, which causes our skin to tan. Numerous clustered melanocyte cells make up a mole.
Why moles should be removed?Most moles do not need to be treated. However, if you don't like the way a mole looks or feels, you might wish to have it removed. If you have any concerns about a mole, consult your doctor. Moles are typically removed if your doctor thinks they could be malignant or for aesthetic purposes. The term "mole" on your skin can also refer to a nevus, or "beauty mark." The majority of moles are benign, and they are extremely frequent. They should not bleed, hurt, or itch, and they are not contagious. The lifespan of a mole can reach 50 years.
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A step-up transformer’s primary coil has 500 turns and its secondary coil has 15,000 turns. The primary EMF is 120 V. What is the EMF of the secondary?
The EMF of the secondary in a step-up transformer is 3,600 V.
The transformer consists of two coils, namely the primary coil and the secondary coil. A step-up transformer will have a higher number of turns in the secondary coil and a higher voltage across the secondary coil. According to the formula
Np ÷ Ns = Vp ÷ Vs
Np ÷ Ns = Is ÷ Ip
Np = Number of turns in the primary coilNp ÷ Ns = Vp ÷ Vs
500 ÷ 15,000 = 120 ÷ Vs
Vs × 500 = 120 × 15,000
Vs × 500 = 1,800,000
Vs = 1,800,000 ÷ 500
Vs = 3,600 V
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what is the minimum stream velocity necessary to transport a quartz particle that is 0.1 centimeter in diameter in a stream?
Minimum stream velocity necessary to transport quartz particle that is 0.1 centimeter in diameter in a stream is : 5.0 cm/s.
What is velocity?Velocity is the directional speed of object in motion as indication of its rate of change in position as observed from particular frame of reference as measured by particular standard of time.
As, Q = V * A
given that the diameter of the particle = 0.1 cm
V is stream velocity , A is cross sectional area of stream and Q is stream flow
Given a particle with a diameter of 0.1 cm,
To determine the stream velocity we use a stadia rod to measure at least 5 meters down ( depth of stream ) three times and then take average value which will be used to determine cross sectional area of the stream but given that the width of the stream is not given the closet value to the stream velocity will be = 5.0 cm/s.
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PLEASE HELP I CAN'T FAIL THIS TEST
Once a crystal has formed, what makes it continue to form?
Do crystals form from the inside or outside and why?
The crystal continues to grow because it has been provided with a pattern or a basic unit.
Why does crystals form?A crystal continues to grow as more molecules or ions arrange themselves in a repeating pattern, consistent with the crystal lattice structure. The growth of a crystal can be influenced by several factors, including temperature, pressure, concentration of the solution, and the presence of impurities. The growth occurs at the surface of the crystal, where atoms or molecules can attach and align with the existing crystal structure.
The rate of crystal growth is dependent on these factors, as well as the type of crystal being formed. Ultimately, a crystal will continue to grow until it reaches a size limited by the available material or until conditions change such that the crystal can no longer form or grow.
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consider a scenario in which an object is placed on a ramp, as pictured below. the coordinate system for the problem has been chosen such that the x-direction points along the ramp and the y-direction points perpendicular to the ramp. as such, the force of gravity acting on the object (despite being vertically down) has both x- and y-components. components coordinate system three possible methods of finding the x-component of the force of gravity are pictured below. your task is to determine which method is correct, and what has gone wrong in the incorrect attempts. comp red1 is x-component of the force of gravity correctly identified in red?
Method 1 is the correct method for finding the x-component of the force of gravity in this scenario. In this method, the force of gravity is split into two components using vector addition - the parallel component along the x-axis, and the perpendicular component along the y-axis. The x-component can then be determined by multiplying the magnitude of the force of gravity (Fg) by the cosine of the angle theta, which is the angle between the x-axis and the force of gravity.
In Method 2, the x-component of the force of gravity is incorrectly identified as the y-component, as the y-axis is perpendicular to the x-axis.
In Method 3, the x-component of the force of gravity is incorrectly identified as the magnitude of the force of gravity, as this value is the total magnitude of the force, not just the x-component.
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Total solar eclipse
Partial lunar eclipse
Total lunar eclipse
Penumbral eclipse
(Assignmen. Bb filedownload.ashx
Drag each type of eclipse to the corresponding location of the moon in
Its orbit.
PLEASE HELP WUICK
moon closest to sun: Total solar
moon farthest from sun: Total lunar
moon next to farthest: partial eclipse
Last moon: Penumbral
Explanation:
Hope this helps
why are there holes in the prongs of electrical plugs
By doing this, the plug is kept from being yanked out of the socket by the cord's or plug's weight. Additionally, it enhances the connection between both the socket and the outlet.
Are holes required for electrical prongs?Plugs have holes that are used to hold them in place inside sockets. Historically, sockets contained bumps. The purpose of these bumps was to fit inside the perforations. It would have been quite simple to simply take the plug out of the connection if there weren't any bumps and holes.
Why do plugs not have holes?This stops the mass of the plug or wire from pulling the plug out of the socket. The contact between both the plug and the output is also improved. Additionally, the manufacturer may "factory seal" or "lockout" some electrical appliances by inserting a plastic tie across either or both of the prong holes.
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what force is responsible for the motion along the boundary between the nazca and south american plates?
B. Slab pull is force responsible for the motion along the boundary between the nazca and south american plates.
Slab Pull: What is it?A cold, solid oceanic plate that is being dragged into the mantle by its own weight is characterized as a slab. Based on the argument, the oceanic plate sinks into the mantle because it has a greater density than the hotter mantle underneath it.
What kind of plate barrier exists between the South American Plate and the Nazca Plate?Examples of ocean-continent convergent borders also include subduction of the Juan de Fuca Plate under North America and the subduction of the Nazca Plate under South America, which led to the formation of the Andes Mountains and the Peru Trench (creating the Cascade Range).
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what force is responsible for the motion along the boundary between the nazca and south american plates?
A) Ridge push
B) Slab pull
C) Rising hot mantle
the electric field just above the surface of the earth has been measured to be 152 n/c downward. what total charge (sign and magnitude) on the earth is implied by this measurement?
The required total charge on the earth when electric field is given is calculated to be 171.4 kC.
Electric field is measured to be 152 N/C.
The value of ε₀ is known to be 8.85 × 10⁻¹² C²/Nm²
Radius of the earth is known as 6.37 × 10⁶ m
Total surface charge by gauss law is given by,
Ф = q/ε₀ = E A ----(1)
where,
E is electric field
A is area
From (1),
q = ε₀ E A = ε₀ E π r² = 8.85 × 10⁻¹² × 152 ×3.14 × (6.37 × 10⁶)² = 4223.93 × 10⁻¹² × 40.58 × 10¹² = 171406.99 C = 171.4 kC
Thus, the total charge on the earth is 171.4 kC.
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explain why the water in the storage reservoir has potential energy that is useful in hydroelectric power generation. (iii) explain how coupling hydroelectric power with solar or wind power is an advantage to providing a constant source of electricity to a community. (iv) explain how a hydroelectric powe
Water gains potential energy just before it spills over the top of a dam or flows down a hill. The potential energy is converted into kinetic energy as water flows downhill. The water can be used to turn the blades of a turbine to generate electricity, which is distributed to the power plant's customers
What is potential energy ?Potential energy is a form of energy that is stored but is dependent on the relative positions of different system components. Stretching or compressing a spring increases its potential energy. A steel ball has more potential energy when it is raised above the surface of the earth than when it is brought to Earth.
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in the hydraulic system shown at right, the piston on the left has a diameter of 4.4 cm and a mass of 1.8 kg. the piston on the right has a diameter of 12 cm and a mass of 3.2 kg. if the density of the fluid is 750 kg/m3 , what is the height difference h between the two pistons if they are free to move so that the system is in equilibrium? explain/show your work
in the hydraulic weighs 1.80 kg, whereas the right piston weighs 3.20 kg. The diameters pistons are 4.40 cm and 12.0 cm, respectively. As a result, there is an 8.60 cm height difference between the two pistons.
What impact be doing the sizes of the pistons in a hydraulic circuit have on the pressure?Each inch of the huge piston's 10 square inch surface is subjected to an equal distribution of pressure. As a result, a 10-pound weight is raised by the larger piston. The mechanical advantage and amount of weight that the second piston can raise increases with the second piston's cross-sectional area.
How can the height differences between two pistons be determined?determining the height The diameter difference is 0.0355 cm. The height difference can be calculated by multiplying this number by the fluid's density, which is 740 kg/m3. We now have a measurement of 0.0885 cm.
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what are the functions of an enzyme? select all that apply.
a. To lower the activation energy for the reaction
b. To increase the of a specific reaction
c. To allow a reaction to be reversible
d. To alter the equilibrium of a spesific reaction
e. To alter the delta G of a spesific reaction
f. To supply energy for an endergonic reaction
The stated purpose of the enzyme is to boost the speed of a certain process and decrease the overpotential for that reaction.
What are energy and its measure?Energy is the capability to accomplish labor. The amount of labor an organism's stored energy is capable of performing after it is expended. energy is a scalar quantity. The term "joule" refers to the SI unit of energy. The quantity of energy required to do one photon of activity is one joule.
What is the simplest definition of energy?Scientists refer to energy as the ability to work. Modernity is feasible because people have learned how to transfer information from one media to another and then use it to complete tasks.
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A new kind of toy ball is advertised to "bounce perfectly elastically" off hard surfaces. A student suspects, however, that no collision can be perfectly elastic. The student hypothesizes that the collisions are very close to being perfectly elastic for low-speed collisions but that they deviate more and more from being perfectly elastic as the collision speed increases.(a) Design an experiment to test the student’s hypothesis about collisions of the ball with a hard surface. The student has equipment that would usually be found in a school physics laboratory.
The student can perform the following experiment: Measure the height of a table from the floor. Drop the ball from a known height and measure the height to which it bounces back. Repeat the process. Measure the speed of the ball just before it hits the surface. Plot the speed of the ball before and after. Compare the pre-collision and post-collision speeds of the ball.
What if the collisions are perfectly elastic?If the collisions are perfectly elastic, the pre-collision and post-collision speeds should be equal. However, if the hypothesis is correct, the deviation from being perfectly elastic should increase with collision speed.
What is elastic collision?An elastic collision is a type of collision in which the total energy of the two colliding objects remains constant.
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the law of conservation of momentum states that the total momentum of an isolated systemTrue or False
Answer:
its false
Explanation:
i think
the difference between speed and velocity involves?
Velocity is the pace and path of an item's movement, and speed is really the time rate where such an object is travelling along a route. The issue is that speed includes no maps application but velocity does.
How does velocity get its name?Thus, velocity is measured in metres per second, or m/s. The metric speed unit is the metre per s (m/s). A different way to describe velocity magnitude is in centimeters per second (cm/s).
Does velocity correspond to speed?Velocity is the pace and orientation of an item's movement, whereas pace is the forecasting which a thing is travelling along a route. In other words, velocity is a vector, whereas speed is a scalar number.
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a ball of putty is dropped from a height of 2 m onto a hard floor, where it sticks. part a what object or objects need to be included within the system if the system is to be isolated during this process? check all that apply. what object or objects need to be included within the system if the system is to be isolated during this process?check all that apply. human dropping a ball ball floor earth solar system
The correct answers are B., Floor and ball
Why is this so?For the released ball to be in an isolated system, the objects to be included are the floor and the ball.
What is the principle of conservation of linear momentum?The principle of conservation of linear momentum states that in an isolated system, the total momentum of a system is conserved.
An isolated system is a system devoid of the influence of external force.
For the released ball to be in an isolated system, the objects to be included are;
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two small spheres separated 3.13 m apart have equal positive charge. the electric force between them is 4.57e-2 n. what is the amount of charge on one sphere (in coulombs)?
Two small spheres separated 3.13 m apart have equal positive charge. the electric force between them is 4.57e-2 n. The amount of charge on one sphere is approximately 1.72 x 10^-9 C.
The electric force between two charged spheres can be calculated using Coulomb's law:
F = k * Q1 * Q2 / d^2
Where,
F = the electric force,
k = Coulomb's constant (8.99 x 10^9 N * m^2 / C^2),
Q1 and Q2 are the charges on the two spheres, and d is the distance between them.
Rearranging the equation and solving for one of the charges:
Q1 =[tex]\sqrt{ (F * d^2 / k)}[/tex] = [tex]\sqrt{(4.57e-2 N * (3.13 m)^2 / (8.99 x 10^9 N * m^2 / C^2))}[/tex] = 1.72 x 10^-9 C
So, the amount of charge on one sphere is approximately 1.72 x 10^-9 C.
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a particle moves on a straight-line path that passes through the points (1,-3,5) and (5,1,3). find a vector-valued function for the path.
The vector-valued function of a particle travelling in a straight line between the coordinates (1,-3,5) and (5,1,3) is r(t) = (1 + 4t, -3 + 4t, 5 - 2t).
According to the question
The parametric equation of a line, which is given by: may be used to find the vector-valued function of a particle traveling along a straight line.
r(t) = r₀ + tv
where,
t is a scalar parameter
v is the path's direction vector
r₀ is a point on the path's position vector.
We may utilize the two locations on the route, (1,-3,5) and (5,1,3), to determine r0 and v:
r₀ = (1,-3,5) (1,-3,5)
v = (5,1,3) - (1,-3,5) = (4,4,-2) (4,4,-2)
Thus, the path's vector-valued function is as follows:
r(t) = (1,-3,5) + t(4,4,-2)
⇒ r(t) = (1 + 4t, -3 + 4t, 5 - 2t)
This is a line's parametric equation that crosses through the points (1, -3, 5) and (5,1,3).
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in which of the following situations is there observational evidence for significant interaction between two objects? how can you tell? (select all that apply.) a charged particle leaves a curving track in a particle detector. a communications satellite orbits the earth. a space probe travels at constant speed toward a distant star. a ball bounces off a wall with no change in speed. a baseball that was hit by a batter flies toward the outfield. incorrect: your answer is incorrect.
The space probe's speed (and direction) stay constant because the probe is nearly free of interactions.
An object may either be studied without using its internal structure or it doesn't have one. Each object's translational and/or rotational motion is altered as a result of an interaction between the two. An object's change in motion is determined by the sum of its interactions when many interactions are present (the net force). There are three fundamental interactions or forces in nature that we are aware of: the gravitational force, the electroweak force, and the strong force. Together, the electromagnetic force and the weak force make up the electroweak force.
These two electroweak force components are dominant at distinct scales and are therefore discussed individually. At various length scales, these fundamental interactions predominate, and all other known "forces" are expressions of one or the other. From the very small scale of molecules (micro and molecular machines and chemical reactions), to the motion of commonplace objects like cars and wind turbines, to the motion of tectonic plates, to the motion of objects and systems at the cosmological scale, the fundamental forces govern both the structure and motion of objects.
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losego a copper wire that is 3.14 m long with a diameter of 2 cm has an electrical resistance of 10 ohms. if this wire is cut exactly in half (equal lengths), what is the electrical resistance of each wire piece?
The copper wire is 3.14 m long with diameter of 2 cm has an electrical resistance of 10 ohms. If the wire is cut exactly in half in equal lengths, the electrical resistance of each wire piece is 20 ohms.
The length of the copper wire = 3.14 m
The diameter of the copper wire = 2 cm
The electrical resistance = 10 ohms
The wire is cut exactly in half in equal lengths, the electrical resistance expression is as follows :
R = ρ L / A
R = 10 ohms × 2
R = 20 ohms
Thus, the electrical resistance of each wire piece is 20 ohms.
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what is motion? a. when an object changes position relative to a reference point. b. when something is still and not moving
a. when an object changes position relative to a reference point is motion.
What is the science of a motion?In physics, motion is a relation of a body's position or orientation over time. Translation is characterized as movement along a line or a curve. Rotation is a motion that adjusts a body's orientation.
What starts and ends motion?Motion is impeded or halted by the force of friction. When two components rub into one another, they create friction, which is a resistance to motion (the sled and the snow, for instance). Even air friction happens. An object can move or accelerate, slow down or descend, cease, or change direction as a result of force.
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a ship travels 55 km on a bearing of and then travels on a bearing of for 140 km. find the distance from the starting point to the ending point.
The distance from the starting point to the ending point is √(49225 - 15400 * cos(C))
To find the distance from the starting point to the ending point, we need to use the law of cosines.
Let's call the starting point A, the first endpoint B, and the second endpoint C. We can use the following formula:
d = √(AB² + BC² - 2 * AB * BC * cos(C))
where d is the distance from A to C, AB is the distance traveled on the first bearing, BC is the distance traveled on the second bearing, and C is the angle between the two bearings.
Given AB = 55 km and BC = 140 km, we can use the formula to calculate d:
d = √(55² + 140² - 2 * 55 * 140 * cos(C))
d = √(3025 + 19600 - 15400 * cos(C))
d = √(49225 - 15400 * cos(C))
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A skier with a mass of 49.1 kg stands on top of a hill at a height of 14.7 m. What is her gravitational potential energy?
Formula for Gravitational Potential Energy:
[tex]GPE=mgh[/tex]
Gravitational potential energy(measured in joules) = mass(measured in kg) * acceleration(measured in 9.8 m/s^2 due to gravity) * height(measured in meters)
__________________________________________________________
Given:
[tex]m=49.1kg[/tex]
[tex]h=14.7m[/tex]
[tex]g=9.8m/s^2[/tex] (due to gravity)
[tex]GPE=?[/tex]
__________________________________________________________
Finding Gravitational Potential Energy:
[tex]GPE=mgh[/tex]
[tex]GPE=49.1\times9.8\times14.7[/tex]
__________________________________________________________
Answer:
[tex]\fbox{7073.346 Joules}[/tex]
According to the law of conservation of momentum, the total momentum of an isolated system is constant. True or false
It is True that The overall momentum of an isolated system is constant, as stated by the law of conservation of momentum. The second and third laws of motion lead to the law of conservation of momentum.
In physics, what is a momentum?The preservation of momentum is, in fact, a fundamental concept of physics, along with the conservation of mass and energy. The difference between an object's mass and velocity is its momentum. When you multiply an object's mass by its velocity, you may calculate its momentum, which is the force required to bring it to a complete stop in a certain amount of time. For each array of many objects, the overall momentum is the sum of the component momenta.
Is the law of motion a physical one?One of the pillars of physics, along with the conservation of mass and energy, is the conservation of momentum. The momentum of an object is determined by dividing its mass by its speed. The force required to stop anything from moving at a specific speed in a specific amount of time is known as momentum. It is computed by dividing the mass of an object by its speed. Any array of several items has an overall momentum that is equal to the sum of their individual momenta.
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