When the crests of two waves overlap, constructive interference takes place. The crests of the waves combine as they pass through one another to create a wave with a larger amplitude. When two troughs come into contact, the same thing may happen.
A phenomenon known as interference occurs when two waves merge by adding their displacements at each and every point in space and time to create a new wave that may have a larger, smaller, or same amplitude. The amplitudes are progressive if one of the waves' crests coincides with another wave's crest. The resultant amplitude would double if the two waves' amplitudes were equal. Remember that the square of the amplitude determines how much light there is in an area. Constructive interference happens where the lines—which represent the peaks—cross one another. In other words, when two waves are in phase, constructive interference happens. Destructive interference results when two waves are completely out of phase (a peak is situated in the middle of two waves).
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which best describes the field of physics? the study of integrating natural sciences the study of scientific laws the study of foundational engineering the study of life and chemical interactions the study of matter and energy next
which best describes the field of physics the study of matter and energy
physics, science that deals with the structure of matter and the interactions between the elemental constituents of the observable universe. the scope of study envelops not as it were the conduct of objects beneath the activity of given forces but the nature and root of gravitational, electromagnetic, and nuclear force fields. In simple words, physics is characterized as the science of matter, movement, and energy. Its laws are regularly expressed with economy and accuracy within the language of science.
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A marathon runner is running with an initial velocity of 3.95 m/s. As the runner approaches the finish line, she increases her velocity to 4.17 m/s. What is the acceleration of the runner approaching the finish line?
Given that the time between when the marathon runner changes her velocity and the finish line is t, the acceleration of the runner approaching the finish line is 0.22/t m/s² .
What is acceleration?The acceleration of a body is the change in the velocity of a body with time.
Acceleration is a vector quantity as it takes into account the change in velocity as well as the change in the direction of the body.
Hence, a body is accelerating if either or both of these two conditions apply:
a change in the velocity occursa change in the direction of the bodyMathematically;
acceleration = change in velocity / time takenThe change in velocity of a body = Final velocity - initial velocity
Change in velocity of the runner = 4.17 - 3.95
Change in velocity of the runner = 0.22 m/s
Time taken for this change = t
Hence;
acceleration = 0.22/t m/s²
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A 30 kg object is moving along with the velocity given below. Find the momentum vector, as well as the magnitude of the momentum. v=5i-2j
Using the concepts of momentum, we got that 150i-60j is the momentum vector and 162.3Kg-m/sec is the magnitude of the momentum of a 30 kg object.
We know very well that momentum is given by the product of mass and velocity of the object.
In other words P=M. v
But, here velocity is given in 2-D form, means momentum is possible in two different directions.
Therefore, for momentum we just need to multiply the mass of the object with velocity
=>Momentum of the object=M×(5i-2j)
=> p=30×(5i-2j)
=> p=150i-60j
Now, talking about the magnitude we know that magnitude is given by
√(x-component)² + (y-component)²
Therefore, magnitude of momentum (|p|)=√(150)²+(--60)²
=> |p|=√22500+3600
=> |p|=√26100
=> |p|=162.3Kg-m/sec
Hence, for 30 kg object is moving along with the velocity given, the momentum vector is 150i-60j, as well as the magnitude of the momentum for v=5i-2j is 162.3kg-m/sec.
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3.a box sits on an inclined plane without sliding. as the angle of inclination increases, the normal force a) increases. b) decreases. c) does not change. d) is directed straight down.
As the angle of inclination increases, the normal force A) increases.
What is normal force ?
In mechanics, the normal force is the component of the contact force normal to the surface in contact with the object. Because normal in this case is used in the geometric sense to mean perpendicular, as opposed to its usual usage meaning "usually" or "usually". A person standing still on the platform would be subject to the gravitational pull toward the core of the Earth, if not for the reaction force from the drag forces of the platform's molecules. This force is called the "normal force".
Normal force is a type of ground reaction force. If a person is standing on a slope and not sinking to the ground or sliding down the slope, the total ground reaction force can be divided into two components:
Vertical forces perpendicular to the ground and frictional forces parallel to the ground.
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How did Copernicus influenced newton
Copernicus influenced Newton as the Copernican Revolution was brought to a close by Sir Isaac Newton's Philosophiae Naturalis Principia Mathematica.
How was Newton influenced?Copernicus, the father of modern astronomy, was a Polish astronomer and mathematician. He was the first European scientist to propose the heliocentric theory of the solar system, which states that Earth and other planets revolve around the sun.
By developing the heliocentric theory of Earth's relationship to our Sun, Nicolaus Copernicus altered how educated people saw the world. The heliocentric theory, which is now widely accepted, states that Earth and the other planets revolve around the Sun.
His laws of planetary motion and universal gravitation were developed to explain the presumed motion of the heavens by asserting a gravitational force of attraction between two objects.
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A rock suspended by a string weighs 5 n out of water and 3 n when submerged. What is the buoyant force on the rock?.
The buoyant force exerted on the rock is 2 N.
What is buoyant force?Buoyancy is the upward force exerted by a liquid that opposes the weight of a partially or fully submerged object. In a liquid column, the pressure increases with depth due to the weight of the liquid above. Buoyancy exists whether an object is floating or submerged. The SI unit of buoyancy is Newton. The factors on which buoyancy depends are:
Volume of the liquid displacedVolume of the body submerged in liquidFor the given case,
Weight of the rock out of water (W₀) = 5N
Weight of the rock when submerged in water (Wₙ) = 3N
Now what decreases the weight of rock in water? It is the buoyant force exerted by water, which can be can be calculated as:
Fᵇ = W₀ - Wₙ
Fᵇ = 5N - 3N
Fᵇ = 2N
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Why aren’t there solar and lunar eclipses every month?
A. Because clouds in Earth’s atmosphere block the Moon’s shadow.
B. Because of the gravitational effects of Jupiter on the Sun.
C. Because the Moon’s orbit is tilted with respect to Earth’s orbit.
D. There are, it’s just that we cannot detect all of them.
Answer:
The answer is C.
When Earth is positioned precisely between the Moon and Sun, Earth's shadow falls upon the surface of the Moon, dimming it and sometimes turning the lunar surface a striking red over the course of a few hours which is how a lunar eclipse happens.
When the Moon orbits Earth, the Moon moves between the Sun and Earth. When this happens, the Moon blocks the light of the Sun from reaching Earth. This causes an eclipse of the Sun, or a solar eclipse. During a solar eclipse, the Moon casts a shadow onto Earth.
Fill in the blanks below
Since the diagram above shows fossils and rock features, X is an intrusion that is younger than layers Y and Z. Therefore, the correct answer option is: intrusion, younger than layers Y and Z.
What is a fossil?In Science, a fossil can be defined as the mineral impression or remains of both living and non-living organisms that are generally considered to be prehistoric in nature.
Additionally, rock strata (layers) that are found in various parts of the world are usually unique and different from one another because they are all composed of distinct geological history of planet Earth, which are commonly referred to as fossils.
This ultimately implies that, fossils are ancient organisms such as plants and animals that were formed into rocks.
By critically observing the rock strata (layers) shown in the image attached above, we can reasonably infer and logically deduce that X would be classified as an intrusion and it is younger than rock layers Y and Z.
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an electric fan is plugged into an outlet and the circuit completed, making the fan blades spin. which of the following correctly describes this situation? responses mechanical energy is transformed into electrical energy. mechanical energy is transformed into electrical energy. mechanical energy is destroyed, and electrical energy is created. mechanical energy is destroyed, and electrical energy is created. electrical energy is transformed into mechanical energy. electrical energy is transformed into mechanical energy. electrical energy is destroyed, and mechanical energy is created. electrical energy is destroyed, and mechanical energy is created.
The situation is correctly described as Electrical Energy is transformed into mechanical energy.
Recalling the working of a fan, i.e. as the circuit is closed, the electrons start flowing in the wires, producing current and hence the current reaches the fan, which rotates due to the magnets in it. Hence the Electrical energy is transformed into Mechanical Energy which is the kinetic energy produced due to rotation of wings of fan.
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A baseball player dives head-first into
second base and slows down while sliding on the infield dirt.
Of the forces listed, identify which act upon the player.
1.Normal
2.Gravity
3.Applied
4.Friction
5.Tension
6. Air Resistance
Answer:
Explanation:
Discussion
The ones that are certain are
Normal GravityFrictionIf you have a normal, and the player slides into 2nd, and stops (which he must before he is tagged), then there must be friction involved. There must be gravity, or he would keep going up.
I don't think there is tension. There might be some Air Resistance, but that force is very tiny. Don't be surprised if you answer includes Air Resistance, but I won't try it to begin with.
A 1{,}000 \text{ kg}1,000 kg1, comma, 000, start text, space, k, g, end text car experiences a net force of 3{,}500 \text{ N}3,500 N3, comma, 500, start text, space, N, end text from its engine.
Calculate the magnitude of the car’s acceleration.
Magnitude of the car's acceleration is 3.5 m/s²
Given:
Mass of car = 1,000 kg
Net force applied by car = 3,500 N
How to find the acceleration of the car?
Formula:
Net force = Mass × Acceleration
So,
3,500 = 1,000 × Acceleration
Acceleration = 3,500 / 1,000
Acceleration = 3.5 m/s²
Therefore, the acceleration found from the formula is 3.5 m/s².
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2. A 10kg block of wood is pulled across a level ground by fore of 15N applied at
an angle of 30 degree from the horizontal. How much work is done, if it is moved
to a distance of 3m?
(Note: F applied = 15N x cos 30 degree, cos 30 degree = 0.5)
Answer:
about 19.49J
Explanation:
Work = F × D × Cosine(θ)
Substitute values :D:
Work= 15N x cos 30 degree x 3m x cos 30
Work= 7.5 x 3 x cos 30
Work= about 19.49 joules
describe an experiment that you could do to measure the horsepower you expend over a specified period of time (both short and long periods). do not describe experiments involving walking/running up a hill, on a treadmill, or around a track, etc.
An experiment that I could do to measure the horsepower I could develop for a long period of time can be "Riding a bike over a straight path".
What is horsepower?
Horsepower can be defined as the unit of measurement of power, or the rate at which work is done. There are many different standards and types of horsepower. In order to calculate horse power we will use the following method ;
Power = Work / Time Power (Force x Distance) / TimeThe term Horsepower was invented by James Watt. It is a unit power that compares the power of a machine to the horse muscle power, steam engine power output compared to the power of draft horses. Now it is used in piston engines, electric motors, turbines and other machinery.
One Horsepower equals to 33,000 lb. ft/min.
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an 8.0 kg object has a moment of inertia of 1.00 kg m2. what torque is needed to give the object an angular acceleration of 1.5 rad/s2?
The torque required to give the object an angular acceleration of 1.5 rad/s² is 1.5 Nm.
TorqueObjects that move in a translational manner use Newton's II law (∑F = ma)and objects that move in a rotational manner also use the same concept of Newton's laws, but the quantity use rotational quantity . Then, Newton's Second Law for objects that move in a rotational manner or move in a circle uses the formula:
τ = (the moment inertia) x (the angular acceleration of the object)
With,
τ = is the total torque acting on the object (Nm)
I = is the moment of inertia of the object (kgm²)
α = is the angular acceleration of the object (r4d/s²)
So, the required torque is:
τ = (1.00 kgm²) (1.5 r4d/s²)
= 1.5 Nm
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A horizontal pipe 10. 0 cm in diameter ha a mooth reduction to a pipe 5. 00 cm in diameter. If the preure of the water in the larger pipe i 8. 00 104 Pa and the preure in the maller pipe i 6. 00 104 Pa, at what rate doe water flow through the pipe?
The rate at which water flow through the pipe is 12.83 kg/s.
What is Bernoulli’s equation?Bernoulli's theorem, is based upon law of conservation of energy. Equalize the total energy (pressure energy, potential energy, and kinetic energy) of a flowing liquid at different points flowing under a constant pressure difference. Bernoulli's equation states that points 1 and 2 are on the streamline, the liquid has a constant density, and the flow is stable with no friction.
D₁ = 10 cm
D₂ = 5 cm
P₁ = 8×10⁴ Pa
P₂ = 6×10⁴ Pa
Let's apply Bernoulli’s equation for the wide and reduced part of this pipe:
P₁+ ¹/₂ρυ₁² = P₂ + ¹/₂ρυ₂²
Now, apply continuity equation:
A₁v₁ = A₂v₂
(D₁²π/4) v₁ = (D₂²π/4) v₂
D₁² v₁ = D₂² v₂
v₂ = (D₁/ D₂)² v₁
v₂ = (10/ 5)² v₁
v₂ = 4 v₁
Now,
P₁+ ¹/₂ρυ₁² = P₂ + ¹/₂ρ4υ₁²
P₁+ ¹/₂ρυ₁² = P₂ + 8ρυ₁²
P₁ - P₂ = 8ρυ₁² - ¹/₂ρυ₁²
P₁ - P₂ = 15/2ρυ₁²
Substitute the values in above equation:
8×10⁴ - 6×10⁴ = 15/2×1000υ₁²
υ₁ = 1.63 m/s
So, volume flow rate is:
ρA₁v₁ = ρ(D₁²π/4)v₁
= 1000×(10²×3.14/4)×1.63
= 12.83 kg/s
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what is the minimum energy input necessary to place this satellite in orbit? ignore air resistance but include the effect of the planet's daily rotation. (use the following as necessary: re, me, g, m, h, and te for the period of earth's rotation.)
The minimum energy input necessary to place this satellite in orbit is
[tex]\frac{1}{2} m(v^{2} - v_{e} ^{2} ) +GM_{E} m(\frac{1}{r} -\frac{1}{R_{E} } )[/tex]
The mass of the satellite = m
Altitude = h = r
The radius of the Earth = [tex]R_{E}[/tex]
The Mass of the Earth = [tex]M_{E}[/tex]
Speed of the satellite = v
Speed of the Earth = [tex]v_{e}[/tex]
Gravitational Constant = G
The energy at the surface of the Earth will be the sum of the kinetic and potential Energy,
So,
[tex]E_{i} = K.E. +P.E.\\\\ E_{i} = \frac{1}{2} mv_{e} ^{2} -\frac{GM_{E} m}{r}[/tex]
Also, Energy in orbit,
[tex]E_{i} = K.E. +P.E.\\\\ E_{i} = \frac{1}{2} mv^{2} -\frac{GM_{E} m}{R_{E} }[/tex]
Now, The change in energy is the minimum energy required to place this satellite in orbit,
Then, the Change in Energy =
∆E [tex]= \frac{1}{2} m(v^{2} - v_{e} ^{2} ) +GM_{E} m(\frac{1}{r} -\frac{1}{R_{E} } )[/tex]
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historically, it turned out that einstein's theory could explain everything newton's theory could, while also explaining more. what quality is it most accurate to say that einstein's theory has based on this brief description?
Scope quality is it most accurate to say that einstein's theory has based on this brief description.
According to Einstein's theory of relativity, the curvature of space and time is what causes what we experience as the gravitational force. This is the fundamental tenet of Einstein's theory of general relativity, which is frequently encapsulated in the sentence: "Matter instructs spacetime to curve, and curled spacetime instructs matter to move." Based on Einstein's astounding discovery that light always moves at a constant speed, regardless of how fast you're moving when you measure it, the theory, which revolutionized our understanding of time and space, was developed. Light in the quantum realm. The photons that make up light, or photons, are tiny energy packets with wavelike characteristics, as demonstrated by Einstein's quantum theory of light. In this theory, Einstein also described the process by which electrons are released from metals after being struck by lightning.
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If it takes an object 3.5 seconds to make one revolution, what is its frequency?
If it takes an object 3.5 seconds to make one revolution, its frequency is 0.286 Hz.
What is frequency?The number of vibrations counted per second is called frequency. A wave is a group of vibrations that are referred to as energy. The bottom node is known as the crest, and the top node is known as the trough.
The frequency of an alternating current is the number of full cycles per second. The hertz, also known as Hz, is the accepted unit of frequency. The frequency of a current is 1 Hz if one cycle is completed per second; 60 cycles per second equals 60 Hz.
Frequency = 1/t
Frequency = 1/3.5
Frequency = 0.286 Hz
If it takes an object 3.5 seconds to make one revolution, its frequency is 0.286 Hz
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6. Borax was mined in Death Valley, California, during the nineteenth century. It
was transported from the valley by massive wagons, each pulled by a team of
21 mules. Suppose each mule's power output was 746 W (about 1 hp). If in a
certain time interval the total work done by the team on the wagon was
2.35x 10' J, how long was that interval of time?
The interval of time it takes for the team to do a work of 2.35×10⁷ J is 15000 seconds.
What is time?Time can be defined as an ongoing and continuous sequence of events that occur in succession, from past through the present, and to the future.
To calculate the time interval the work was done by the team on the wagon, we use the formula below.
Formula:
t = W/P........... Equation 1Where:
t = Interval of time it takes the team to do the workW = Total work done by the team on the wagonP = Power output of the teamFrom the question,
Given:
W = 2.35×10⁷ JP = 746×21 ( If each mole power output is 746 W)P = 15666 WSubstitute these values into equation 1
t = 2.35×10⁷/15666t = 1500 seconds.Hence, the interval of time it takes to the the work is 15000 seconds.
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The volume v of a gas varies directly as the temperature t and inversely as its pressure p if v = 80ml when t=30 and p=10kg what will be the volume when t =20 and p =20kg?
The volume of the gas at the given conditions will be 26.6 ML.
By Ideal Gas Law we know that
[tex]\frac{P1 V1}{T1}[/tex] = [tex]\frac{P2 V2}{T2}[/tex]
In the given question here, P1 = 10 Kg ; V1 = 80 ML ; T1 = 30 ; P2 = 20 Kg ; T2 = 20 Substituting the values in the equation
[tex]\frac{10 X 80}{30\\}[/tex] = [tex]\frac{20 V2}{20}[/tex]
[tex]\frac{80}{3}[/tex] = V2
V2 = 26.6 ML .
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. ****an elastic cord is 80. cm long when it is supporting a mass of 10. kg hanging from it at rest at rest. when an additional 4.0 kg is added, the cord is 82.5 cm long. hint: 4 kg stretches the cord 2.5 cm!!
An elastic cord with natural length of 80 cm stretched to 82.5 cm when an additional 4 kg mass attached. The spring constant of the cord is 1600 N/m
According to the Hooke's Law, the force applied on a string is directly proportional to the length of extension ( or compression).
F = kx
Where:
F = applied force
k = spring constant
x = length of extension/compression
Data given from the problem:
Natural length = 80 cm
The length of stretch when an additional 4 kg mass added = 82.5
Hence,
x = length of extension = 82.5 - 80 = 2.5 cm = 2.5 x 10⁻² m
The force = 4 x 10 = 40 N
Hence, the spring constant:
k = F / x = 40 / (2.5 x 10⁻²) = 1600 N/m
Complete question:
an elastic cord is 80. cm long when it is supporting a mass of 10. kg hanging from it at rest at rest. when an additional 4.0 kg is added, the cord is 82.5 cm long. hint: 4 kg stretches the cord 2.5 cm!!
a. What is the spring constant of the cord?
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Uv rays are a type of ""ionizing radiation"" and are energetic enough to damage biological tissue such that they degrade into ions and electrons. What other forms of electromagnetic radiation do you think could be ionizing?.
Other forms of electromagnetic radiation you think could be ionizing are x-rays and gamma rays.
Ionizing radiation, including nuclear radiation, consists of subatomic debris or electromagnetic waves which have sufficient strength to ionize atoms or molecules by using detaching electrons from them.
Ionizing radiation is a shape of power that acts by using casting off electrons from atoms and molecules of materials that include air, water, and dwelling tissue. Ionizing radiation can journey unseen and bypass these materials. whilst ionizing radiation interacts with cells, it is able to purpose damage to the cells and genetic fabric (i.e., deoxyribonucleic acid, or DNA). If now not properly repaired, this damage can result in the death of the mobile or probably dangerous adjustments in the DNA (i.e., mutations.
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you know a 100 watt light bulb glows brighter than a 50 watt light bulb. but which bulb has the higher electrical resistance?
100 watt light bulb glows brighter than a 50 watt light bulb and 50 watt light bulb is higher resistance than 100 watt bulb.
A circuit's opposition to current flow is measured by its resistance. Resistance is the degree to which a substance obstructs or opposes an electric current. Electron flow is referred to as electric current. To better understand resistance, imagine how difficult it would be for a person to move from one shop to another in a crowded market. Resistors are used in heaters, toasters, microwaves, electric stoves, and a variety of other heating appliances due to their inherent ability to generate heat when conducting current. When electricity is passed through a metal filament in a light bulb, a very high temperature is created from the resistance, which causes the metal filament to glow white-hot. The ohm (), which represents resistance, is denoted by the letter R.
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A 3.5 kg bowling ball is rolling in a straight line. if its momentum is 14 kg * m/s , how fast is the bowling ball traveling?
The velocity of the bowling ball is 4 m/s when mass of the bowling ball is 3.5 kg and momentum given is 14kgm/s.
As we know that,
Momentum= Mass* Velocity
p=mv
Here, Mass of the Bowling Ball(m)= 3.5 Kg
Momentum(p)= 14kgm/s
Velocity= Momentum/Mass
=14/3.5 = 4m/s
The definition of momentum is "mass in motion." Since every item has mass, if it is moving, it must have momentum since its mass is in motion. The quantity of motion and the speed of the motion are the two factors that determine how much momentum an item possesses. The factors mass and velocity affect momentum. According to an equation, an object's momentum is determined by multiplying its mass by its velocity.
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To answer this question, we need to use the formula for momentum, which is:
momentum = mass * velocity
We can rearrange this formula to solve for velocity, which is:
velocity = momentum/mass
We are given the momentum and the mass of the bowling ball, so we can plug them into the formula:
velocity = 14 / 3.5
We can simplify this expression by dividing both numbers by 0.5:
velocity = 28 / 7
We can convert this fraction into a decimal by dividing the numerator by the denominator:
velocity = 4
Therefore, the bowling ball is travelling at 4 m/s.
A helium-filled weather balloon is held at ground level. The volume of the balloon is 4800 m3. The pressure of the helium is 98 kPa.
The balloon is released and rises to a height where the volume of the balloon is 7200 m3.
(i) Calculate the new pressure of the helium. Assume that the temperature stays constant.
65.3 kPa is the new pressure of the helium.
V1= 4800 m3
V2= 7200 m3.
P1= 98 kPa.
P2=?
P1V1=P2V2
P2=P1V1/V2
P2= 98×4800÷7200
P2=65.3 kPa.
The definition of pressure is force/area. For instance, the weight of the snow divided by the area of the roof would represent the pressure from snow on a roof. Gases are often where pressure in chemistry originates from. Vacuum is the term for the lack of pressure. Since "nature abhors a vacuum," humans have believed that vacuums are both impossible and unnatural for hundreds of years. This isn't really the case.
The amount of pressure units is insane! The torr or mmHg is a common unit. Simply put, this refers to the height of a mercury column. The atmospheric pressure is about 760 torr, or mmHg. You may also see mmH2O, which employs the same notion, but in this instance the atmospheric pressure is around 10.3 mH2O since water is less dense than mercury.
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A spring has an unstretched length of 11 cm . It exerts a restoring force F when stretched to a length of 12 cm. For what total stretched length of the spring is its restoring force 3F? At what compressed length is the restoring force 2F?
Using the spring constant relation, the required length and compressed length of the spring at the given force values are 14 cm and 9 cm respectively.
A.) Using the given formula,
F = ke
Where k = spring constant , e = extension and e = (Final length - Initial length)
Initial length, l = 11
Final length = L1 = 12
F = k(12 - 11)
F = k(1)
F = k
Length for a restoring force of 3F ;
3F = k (Final length - Initial length)
k = F
3F = F(L1 - 10)
3F = - 11F + F(L1)
F(L1) = 3F + 11F
F(L1) = 14F
L1 = 14 cm
Hence, required length is 14 cm
B.) Let compressed length = c
2F = F(initial length - compressed length)
2F = F(10 - c)
2F = 11F - F(c)
F(c) = 11F - 2F
F(c) = 9F
c = 9F / F
c = 9 cm
Therefore, the required compressed length is 9 cm
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Since the drag force is proportional to the square of speed, what can you do to improve your car’s gas mileage?.
The answer is Aerodynamic Shaping.
Aerodynamic Shaping can reduce the drag force of an automobile and hence Increase the car's gas mileage. Integrated into the overall shape of an aerodynamic car are the wheel arches and headlights that reduce drag while also reducing wind resistance.
AeroDynamics is basically the study of how air move arround the things which deal with lift, drag, thurst and weight.
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This question is typical on some driver’s license exams: A car moving at 43 km/h skids
14 m with locked brakes.
How far will the car skid with locked brakes
at 129 km/h? Assume that energy loss is due
only to sliding friction.
Answer in units of m
Answer:
Braking distance 126 meters
Explanation:
Given:
V₁ = 43 km/h = 43 000 m / 3 600 s ≈ 12 m/s
D₁ =14 m
V₂ = 129 km/h = 129 000 m / 3 600 s ≈ 36 m/s
____________________
D₂ - ?
D₁ = V₁² / (2·a)
2·a·D₁ = V₁²
a = V₁² / (2·D₁)
D₂ = V₂² / (2·a) = V₂²·2·D₁ / (2·V₁²) =
= V₂²·D₁ / V₁² = D₁·(V₂ / V₁)²
D₂ = 14·(36 / 12)² = 14·3² = 126 m
The braking distance has increased 9 times!
Why did the ball move the same distance when it was on the flatbed truck that accelerated 0. 2 m/s?.
The ball moves the same distance when it was on the flatbed truck because of Relative velocity.
The relative velocity of the ball with respect to the truck is same as of truck with respect to ball at equal times.
Relative velocity - Relative velocity is velocity of an object in relation to another object
It is the measure of how fast two objects are moving with respect to each other.
The distance travelled by each object is determined by product of velocity and time of motion
d = vt
where, d= distance
v = velocity
t = time
so here we can say that if the ball is moved the same distance when it was on truck, then the relative velocity of the ball with respect to truck is same as of truck with the ball.
To know more about relative velocity,
https://brainly.com/question/19260269
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a particle is projected horizontally at 10m/s from the top of a tower 20m high.
calculate the horizontal distance travelled by the particle.( g=10m/s^2)