Answers
Answer:
h = 51.75 m
nearest answer is:
53.4 m
Explanation:
First we analyze the horizontal motion. Since, the air friction is assumed to be negligible. Hence, the horizontal motion shall be uniform. Therefore,
s = V₀ₓ t
where,
s = horizontal distance = 39 m
V₀ₓ = Horizontal Initial Velocity = 12 m/s
t = time = ?
Therefore,
39 m = (12 m/s)t
t = 39 m/12 m/s
t = 3.25 s
Now, we analyze the vertical motion. Applying newton's second equation of motion to vertical motion:
h = V₀y t + (1/2)gt²
where,
h = height of cannon = ?
V₀y = initial vertical velocity = 0 m/s
g = 9.8 m/s²
Therefore,
h = (0 m/s)(3.25 s) + (1/2)(9.8 m/s²)(3.25 s)²
h = 51.75 m
Related Questions
HELP ME ASAPPPPPPPPPPP
A penny sinks to the bottom of a wishing well
What type of frictional force is that?
Answers
The frictional force involved when a penny sinks to the bottom of a wishing well is primarily due to viscous drag or fluid friction. As the penny moves through the water, it experiences resistance from the surrounding fluid. This resistance is caused by the frictional forces between the water molecules and the penny's surface.
Difference between relating velocity and angular velocity?
Answers
Answer:
Linear velocity is speed in a straight line (measured in m/s) whileangular velocity is the change in angle over time (measured in rad/s, which can be converted into degrees as well).
Explanation:
hope this helps :)
The half-life of Silver-105 is 3.57 x 106 seconds. A sample contains 5.78 x 1017 nuclei. What is the decay constant for this decay?
Answers
Answer:
The decay constant, or "lambda" (λ), is the rate at which a radioactive isotope decays. It is usually measured in units of inverse time, such as seconds. In this case, the decay constant can be calculated as follows:
16:42
λ = (ln(2)/3.57 x 106) x (5.78 x 1017) = 0.
Explanation:
The prediction that alcohol slows reaction time is:_________.
a) nondirectional
b) directional
c) semi directional
d) partially directional
Answers
Answer:
b) directional
Explanation:
The prediction that alcohol slows reaction time is Directional . This is because for alcohol to be known as one which slows reaction time means there have been various hypothesis conducted which supports this.
In this case, formulation of a null hypothesis is usually necessary which means that alcohol does not slow reaction time and another alternative hypothesis that suggests that alcohol slows reaction time.
In Asch's study referenced above, answer the following questions: How is the principle of conformity examined? When and why do you think the subject in the experiment began to "second guess" himself? What are some of the circumstances in the experiment which contribute to “conformity”? Why do you think some participants would be more likely to conform than others? There are many reasons why people conform. Were you ever in a situation where you had to conform? Why did you feel the need to conform?
Answers
In Asch's study referenced above, all the questions are answered below.
What is principle of conformity ?It states that conformity to land use objective contributes to economic stability in a residential community.
In areas that were not developed all at once or not well planned, individuals purchase vacant lots and set about building on their own homes. These areas suffer from the not having sense of conformity.
Asch measured number of times each individual has conformed to the majority views. About 32% of individual participated who were placed and conformed with incorrect majority. Over 12 critical trials, 75% of individuals conformed at least once and 25% never conformed.
The reason for individuals to participate is because they have been interviewed after the experiment. Most of the people did not believe in conforming. They still go along due to group fear of being ridiculed. Some believed the group's answers were not correct.
There were two reasons to conform, one is to fit in the group and believed the groups are better informed than they are.
When compared, mostly the answers are found to be incorrect and not satisfying and conformity has increased.
The more difficult is the task, one goes for conformity. When an individual is allowed to answer in private, the conformity decreases.
There is a need to conform because there are fewer groups not so powerful as there is no fear of any rejection.
Thus, all the questions are answered.
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Please help if you do I will give you 50 points and brainliest. I'll give you 50 points by posting another question just to make it clear.
Answers
Answer:
Name and Title: Lyric Howe, Mrs. Stefani, 9/20/17, Thermal Energy and Chemical Change Engineering Lab
Define the Problem:To understand thermal energy and chemical changes better by building my own train.
Criteria and Limitations—In this section, please list at least three criteria that must be met by your train design. Also include any limitations that could prevent it from getting its cargo to the station.
Criteria Limitations One steam engine Two separate hills One cargo box Missing tracks Stack items across or atop each other Weight
Design Ideas—Pros and Cons:In this section, describe three design ideas you have for your train. List at least one pro (a positive) and one con (a negative) for each design option
Description of Train Design One Wheels first with two springs underneath each wheel, the panda cargo in the middle with the steam engine in the front, and two sets of helium balloons.
Base your answer(s) to the following question(s) on the information and diagram
below.
A 250-kilogram car is initially at rest at point on a roller counter track.
The car carries a 75-kilogram passenger and is 20. meters above the ground
at point A. (Neglect friction.)
-7519
-250.
Ground
Compare the total mechanical energy of the car and punger at points A, B,
and
• Explanation:
.
Base your answer to the following question on the information below and on your
knowledge of physics
A gre-powered model airplane has a mass of 2.50 kilograms. A student
exerts a force on a cord to keep the airplane flying around her at a constant
speed of 18.0 meters per second in a horizontal, circular path with a radics
of 25.0 meters
Calculate the kinetic energy of the moving airplane. Show all work, including the
equation and substitution with units]
• Equation: KE = _m_ V^2
• Work: Ke=12*2.50kg*18^2m/s
• Answer w/Units:
.
.
Answers
Done I don't know answer of this question or this photo is the answer can you tell me
The magnitude of the centripetal force exerted on the airplane to keep it moving in this circular path is 32.4 N.
Mass of the airplane, m = 2.5 kg
Speed at which the airplane is flying, v = 18 m/s
Radius of the circular path, r = 25 m
The necessary force for the airplane to fly is provided by the centripetal force.
The component of force applied on an object in curvilinear motion that is pointed in the direction of the axis of rotation, or the center of curvature is known as the centripetal force.
F = Fc
The expression for the centripetal force acting on the airplane is given by,
Fc = mv²/r
Fc = 2.5 x 18²/25
Fc = 324/10
Fc = 32.4 N
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Your question was incomplete, but most probably your question would be:
A gas-powered model airplane has a mass of 2.50 kilograms. A student exerts a force on a cord to keep the airplane flying around her at a constant speed of 18.0 meters per second in a horizontal, circular path with a radius of 25.0 meters. what is the magnitude of the centripetal force exerted on the airplane to keep it moving in this circular path.
I don't know the correct answer. Can you help?
Answers
The dielectric strength of the dielectric is closest to 2500 kV/m.
How to find dielectric strength of the dielectric?The capacitance of a parallel plate capacitor is given by:
C = εA/d
where ε is the permittivity of the dielectric, A is the area of each plate, and d is the distance between the plates.
In this case, the capacitance is given as 2000 pF, or 2 x 10^-9 F. The area of each plate is (80 x 10^-3 m) x (80 x 10^-3 m) = 6.4 x 10^-3 m^2. The distance between the plates is 0.20 x 10^-3 m.
Plugging in these values to the equation above, we get:
2 x 10^-9 F = ε(6.4 x 10^-3 m^2)/(0.20 x 10^-3 m)
Solving for ε, we get:
ε = (2 x 10^-9 F)(0.20 x 10^-3 m)/(6.4 x 10^-3 m^2)
ε = 6.25 x 10^-12 F/m
The dielectric strength of a material is defined as the maximum electric field that the material can withstand before breaking down. The voltage rating of the capacitor is 500 V, so the electric field between the plates is:
E = V/d = 500 V/(0.20 x 10^-3 m) = 2.5 x 10^6 V/m
To convert this to kV/m, we divide by 1000, giving:
E = 2.5 x 10^3 kV/m
Therefore, the dielectric strength of the dielectric is closest to 2500 kV/m.
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If we could build a spaceship capable of traveling at a speed near the speed of light, we could send a ship to a star that is 500 light-years away and it would return just a few years after we launched it.
If we could build a spaceship capable of traveling at a speed near the speed of light, passengers on the ship could make a journey to a star that is 500 light-years away within their lifetimes.
Because special relativity tells us that we cannot reach or exceed the speed of light, it means that distant stars will never be within our reach because the time required to reach them will always be quite long, even with fast spaceships.
Thanks to effects of special relativity, we could build a spaceship that could go close to the speed of light with much less fuel than we would have guessed from Newton's laws of motion.
Answers
According to the theory of special relativity, time and space are relative to the observer. This means that time can slow down and distances can shorten for an observer traveling at a speed close to the speed of light.
Therefore, if we could build a spaceship capable of traveling at a speed near the speed of light, we could send a ship to a star that is 500 light-years away and it would return just a few years after we launched it from the perspective of the passengers on the ship. However, for an observer on Earth, the journey would still take 500 years each way.
Similarly, passengers on the ship could make a journey to a star that is 500 light-years away within their lifetimes, even though the journey would still take 500 years from the perspective of an observer on Earth. This is because time slows down for the passengers on the ship as they approach the speed of light.
While special relativity does tell us that we cannot reach or exceed the speed of light, it also tells us that we can get close to the speed of light with much less fuel than we would have guessed from Newton's laws of motion. This is because the mass of an object increases as it approaches the speed of light, which means that it requires less fuel to accelerate it to a high speed.
In conclusion, the effects of special relativity would allow us to build a spaceship that could travel close to the speed of light and make journeys to distant stars within the lifetimes of the passengers on the ship. However, the journey would still take a long time from the perspective of an observer on Earth.
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Assume that a person bouncing a ball represents a closed system. Which
statement best describes how the amounts of the ball's potential and kinetic
energy change?
O A. The ball's kinetic energy increases as it falls and its potential
energy decreases.
B. The ball's potential energy decreases as it rises and its kinetic
energy increases.
C. Both the kinetic and potential energy of the ball decrease.
D. Both the kinetic and potential energy of the ball increase
Answers
Answer:
I know that it is A
Explanation:
Two equal and opposite charges are placed 40mm apart,if the force between them is found to be 0.5N Calculate the magnitude of the charge
Answers
F = k * (q1 * q2) / r^2
where k is Coulomb's constant (9 x 10^9 N m^2 C^-2).
In this problem, we have two equal and opposite charges, so we can assume that q1 = -q2 = q. The distance between them is 40 mm, which is 0.04 m. We are given that the force between them is 0.5 N. Therefore, we can set up an equation:
0.5 N = k * (q * q) / (0.04 m)^2
Simplifying and solving for q:
q^2 = (0.5 N * (0.04 m)^2) / k
q^2 = (0.5 N * (0.04 m)^2) / (9 x 10^9 N m^2 C^-2)
q^2 = 8.88 x 10^-12 C^2
q = sqrt(8.88 x 10^-12 C^2)
q = 2.98 x 10^-6 C
Therefore, the magnitude of each charge is 2.98 x 10^-6 C.
After the initial experiment, students wondered how a person's weight would influence the results. They conducted a second experiment to determine if the mass of an object affected friction, assuming the types of surfaces remained constant. A spring scale was attached to a wooden block (1 kg). The block was placed on a wooden board and the spring scale was used to pull the block. The magnitude of the force required to start the block moving was recorded in the data table. The experiment was repeated using two, three, and four blocks. The data can be seen in the data table at the top of the page. What is the relationship between static friction and weight?
Answers
Answer:
The greater the weight of the person, the more static friction.
Explanation:
USATestPrep
A 1400 kg car drives at 27 m/s over a circular hill that has a radius of 460 m as shown in (Figure 1). At the point shown in (Figure 1), what is the normal force on the car?
Answers
The normal force acting on the car that weighs 1400 kg and drives at 27 m / s is 8390.82 N
The car is not horizontal. So the force mg is resolved into its horizontal and vertical component.
cos θ = Adjacent side / Hypotenuse
cos 30° = r / mg
r = m g cos 30°
Since the path is a circular, the net force acting on the car is equal to the centripetal force,
m g cos 30° - N = m v² / r
m = Mass
g = Acceleration due to gravity
N = Normal force
v = Velocity
r = Radius
N = m g cos 30° - m v² / r
N = ( 1400 * 9.8 * 0.87 ) - [ ( 1400 * 33² ) / 430 ]
N = 11936.4 - 3545.58
N = 8390.82 N
Therefore, the normal force acting on the car is 8390.82 N
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What would make oppositely charged objects attract each other more?
o increasing the positive charge of the positively charged object and increasing the negative charge of the negatively
charged object
o decreasing the positive charge of the positively charged object and decreasing the negative charge of the negatively
charged object
O increasing the distance between the positively charged object and the negatively charged object
O maintaining the distance between the positively charged object and the negatively charged object
Answers
Answer:
First choice
Explanation:
F orce = C q1 q2 / r^2 to increae the force you can increase either charge or DECREASE the distance between them
Plz help will give brainliest
Assignment: 02.03 Conservation of Mass
Details
Submit the assignment following the instructions in the lesson.
Due Date
N/A
20
Points Possible
20
Course Contribution
3
Submissions Allowed
0
Submission Number
Answers
The law of conservation of mass states that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations. According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants.
Answer:
Steel Wool + Oxygen, Steel wool has a hard texture but is a grayish color. It looks like it's a powder, and also that it was rusted steel wool and then broken apart converted into a powder. So Iron oxide is 7 grams and combined steel wool is 7 grams, so you may assume that the mass has been retained. Yeah, it is a chemical change since the corrosion and rust in steel wool is a chemical process, but iron oxide is triggered by a physical change.
Egg + Heat, In the center, the egg has a yellow yolk while at the edge of the egg there is a kind of liquid, but it is visible, the heat becomes hot but clear The egg transformed into a delicious food called an omelet, which was yolk staid as a liquid but got a little harder, It was retained because the eggshell was 4 grams and the fried egg is 41 grams, but the clear border around it changed color. It is a chemical transition, and it results in the creation of new particles and the chemical bonds split apart and new ones are formed
Water + Heat, Water is a clear liquid, while the heat is very hot yet transparent. Once 5 g of liquid is a gas, it'll become 5 g of water vapor. Water + Heat Water is really a clear liquid. The mass of the liquid water is simply transformed into mass of the water vapor that is freshly created. There was no chemical process although water vapor can also be converted back to water, but it only shifted from a liquid to a gas and the structure did not change.
Zinc + Hydrogen Chloride Zinc, a metal white/silver solid. A clear, colorless liquid fluid with a really low pH in hydrogen chloride In hydrogen chloride, zinc is “dissolved” while releasing a colorless vapor. The liquid, possibly still having a low pH from the remaining acid, stays a colorless liquid.As sparked with a burning wooden splint, the colorless gas gathered in a tube provides a loud bang, because it is neither air trapped in the zinc, nor absorbed in hydropower acids. Well, even if the zinc is 12 grams and not 15 grams, the gas released was 3 grams and, as we all know, 3 + 12 is 15, so you could claim also that volume has also been saved.
Sodium Hydroxide + Copper, Sulfate Sodium hydroxide is a turbid solution and bright blue crystals are formed from copper sulfate A pale blue powder of basic copper hydroxide a solution of neutral salt sulfuric acid would be produced when their solutions are mixed with each other. The combined sodium hydroxide and copper sulfate make a total of 67 grams and the product is split because the sodium sulfate is 47 grams and the copper hydroxide is 20 grams, but all together it is still 67 grams, and you could assume that now the mass has been conserved. The evidence of a response was its image of royal blue basic copper hydroxide precipitates and a neutral salt sodium solution
Explanation:
Why do the waves have different speeds in different layers of Earth's surface?
A Earth's different layers contain materials with different energy-transfer properties.
B Earth's different layers already move at different speeds because of Earth's rotation
O c Waves increase in speed as they move away from their source, so they move faster in deeper layers.
D. Waves gain heat energy by traveling through each layer, and the heat is transformed to kinetic energy.
Answers
Answer:
Material's density
Explanation:
Seismic waves travel at different rates of speed based on a material's density. Hopefully, you understand that the Earth has three main layers: the crust, mantle, and core. Earthquake waves move faster through solids.
7. A particle of mass 3 kg is held in equilibrium by two light unextensible strings. One string is horizontal, as shown in Figure 7.30. The tension in the horizontal string is PN and the tension in the other string is N. Find a) the value of 0 b) the value of P.
Answers
The tension in the strings are 31.47 and 19.25 N respectively.
Mass of the block, m = 3 kg
From the figure, consider the vertical components,
T₁ sin45° + T₂ sin30° = mg
(T₁/√2) + (T₂/2) = 3 x 9.8 = 29.4
Also, consider the horizontal components,
T₁ cos45° = T₂ cos30°
T₁/√2 = T₂ x√3/2
T₁ = T₂ x √3/2 x √2
So,
T₁ = 0.612T₂
Applying in the first equation,
(T₁/√2) + (T₂/2) = 29.4
(0.612T₂/1.414) + 0.5T₂ = 29.4
0.434 T₂ + 0.5 T₂ = 29.4
0.934 T₂ = 29.4
Therefore, the tension,
T₂ = 29.4/0.934
T₂ = 31.47 N
So, the tension,
T₁ = 0.612 T₂
T₁ = 0.612 x 31.47
T₁ = 19.25 N
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Magnets are used in an electric door bell as well as in a magnetic compass. State three differences between the two magnets
Answers
Answer:hope this helpsss
Explanation:
A permanent magnet that is always aligned with the magnetic field of the earth makes up the magnetic needle of a magnetic compass, which is used for navigation.
The magnetic field is produced by an electric current in an electromagnet. Because they are transient magnets, electromagnets lose their magnetic properties as soon as the current is interrupted.
Which of the following is a Nobel gas?
Ba2+
OA
OB. Ci
Kr
Ос.
Ca
D.
Answers
Answer:
Kr
Explanation:
the element that is in group 18 is noble gasses. the elements are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn), and oganesson (Og).
- What is the velocity of a 500kg elevator that has 4000J of energy?
Answers
m = mass = 500 kg
Kinetic energy (KE) = 4000 J
Apply the Kinetic energy formula:
• KE = 1/2 m v^2
v= velocity
Replacing:
4000 = 1/2 (500) v^2
Solve for v
4000 = 250v^2
4000/250 = v^2
16 = v^2
√16 = v
v = 4 m/s
Help pls!!
What is the gravitational potential energy of an object of weight 24 N at a height of 3.2 m from the ground?
Answers
The gravitational potential energy (PE) of an object can be calculated using the formula:
PE = mgh
Where:
PE is the gravitational potential energy
m is the mass of the object
g is the acceleration due to gravity
h is the height or distance above the reference point (usually the ground)
In this case, you provided the weight of the object, which is 24 N. The weight of an object is the force due to gravity acting on it, and it can be calculated using the formula:
Weight = mg
Where:
Weight is the force due to gravity
m is the mass of the object
g is the acceleration due to gravity
Since you haven't provided the mass of the object, we can find it by rearranging the weight formula:
m = Weight / g
Now, we can calculate the mass of the object:
m = 24 N / 9.8 m/s² ≈ 2.45 kg
Now we have the mass (m = 2.45 kg), the height (h = 3.2 m), and the acceleration due to gravity (g ≈ 9.8 m/s²). Plugging these values into the formula for gravitational potential energy:
PE = mgh
= 2.45 kg × 9.8 m/s² × 3.2 m
≈ 76.736 J
Therefore, the gravitational potential energy of the object at a height of 3.2 m from the ground is approximately 76.736 joules (J).
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What type of fronts form a hurricane?
Answers
Answer:
Hurricanes conditions occur when warm, moist air evaporates from the surface of the ocean and rises quickly. This warm air meets cool air in the higher elevations that causes condensation of the warm air vapor.
Explanation:
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I dont think hurricanes have any fronts
Explanation:
A hurricane usually contains an eye with sinking air, whereas mid-latitude cyclones have a center of low pressure with rising air. Hurricanes have their strongest winds around the eye of the hurricane where mid-latitude cyclones have their strongest winds aloft, in the jet stream.
pls help!!
An object is placed 3.0 cm away from a convex lens of focal length 2.0 cm as shown in fig.
1. Use the lens equation to calculate the image distance.
2. Is the image real or virtual? how do you know ?
Answers
(1) The distance of the image formed by the lens is determined as 6 cm.
(2) The image formed is real.
What is the image distance?The distance of the image formed by the lens is calculated by applying the following formula as follows;
1/f = 1/v + 1/u
where;
v is the image distanceu is the object distancef is the focal length of the lensThe distance of the image formed by the lens is calculated as;
1/v = 1/f - 1/u
1/v = 1/2 - 1/3
1/v = 1/6
v = 6 cm
Since the sign of the image of the image is positive, the image formed is real.
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The following two graphs represent data from the same wave travelling due west through a particular medium. From the graphs determine: (a) the wavelength; (b) the amplitude; (c) the period; (d) the frequency and (e) the velocity of the wave
Answers
Answer:
i think i am late but b is 3
Explanation:
Example 7.1
. A thunder was heard 4 s later after the lightning is seen. If the distance of the
lightning is 1396 m away from the observer, what is the speed of sound at
that temperature?
Answers
s = 1396/4 = 349m/s
▼
Part D
The quantity represented by v is a function of time (i.e., is not constant).
True or false
Part E a particle moves with constant acceleration a. The expression VI +80 represents the particles velocity at what instant in time.
A. At a time T=zero
B. At the initial time
C. When a time tea has passed since the beginning of the particles motion, when its velocity was the vi
Answers
The amount indicated by is not fixed and changes over time. In situations where the linear acceleration is not zero, the velocity is always changing.
The first case is true
Since it depends on time, is not constant?
The amount indicated by is not fixed and changes over time. In situations where the linear acceleration is not zero, the velocity is always changing.
The dimension of the quantity albo will be ufa au av u t when calculating a particle's velocity as a function of time t using the formula v = a(1 - eb), where a and b are constants. (1 - e-b) Greutate, urb'a 221 Aich, a zat a2b3c faut Eleft.
The amount indicated by is not fixed and changes over time. When linear acceleration is absent .
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The quantity represented by v is a function of time (i.e., is not constant).
True or false
A particle moves with constant acceleration a. The expression VI +80 represents the particles velocity at what instant in time.
A. At a time T=zero
B. At the initial time
A particle starts from the origin at time t = 0 and moves along the positive x - axis. The graph of velocity with respect to time is shown in figure. What is the position of the particle at time t = 5s?
Rahim and john were two friends. once rahim went to visit the new house of john . to expel hot air out of the kitchen, john fitted an exhaust fan on his kitchen window. by seeing this , rahim said to john that an exhaust fan should place on the wall near his kitchen ceiling. otherwise, the exhaust fan will not expel the hot air more effectively.
(a). is rahim right or wrong ? why?
(b). how a vantilator works in circulating fresh air in the room?
Answer soon as possible
Answers
Answer:
i don't know how to explain it but I think it's just the way you do it by yourself
A 2 m tall barrel is closed on top except for a thin pipe extending 8 m up from the top. When the barrel is filled with water up to the base of the pipe (2 m deep), the water pressure on the bottom of the barrel is 20 KPa. What is the pressure on the bottom when water is added to fill the pipe to its top?
Answers
Pressure on the bottom when water is added to fill the pipe to its top is 180kPA.
In the first scenario, the atmospheric pressure is:
In the second scenario, h = 8m + 1 m. Therefore, the pressure at the bottom of the barrel is:
What is hydrostatic pressure meaning?
Hydrostatic pressure refers to the pressure that any fluid in a confined space exerts. If the fluid is in a container, there will be some pressure on the wall of that container.
What is hydrostatic pressure used for?
Hydrostatic pressure is one reason (along with the lack of oxygen) why it's not safe for humans to travel unprotected in space. You rely on hydrostatic pressure to keep your lungs at the right inflation and to keep the water in your body from vaporizing.
How is hydrostatic pressure calculated?
The pressure in a liquid at a given depth is called hydrostatic pressure. This can be calculated using the hydrostatic equation:
P = rho * g * d, where P is the pressure, rho is the density of the liquid, g is gravity (9.8 m/s^2) and d is the depth (or height) of the liquid.
Thus, the pressure on the bottom when water is added to fill the pipe to its top is 180kPa.
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What is the kinetic energy of a moving toy car if the car has a mass of 15.0 kg and the velocity is 7.2 m/s ? ______ J
Answers
Answer:
389 J
Explanation:
m = 15.0 kg, v = 7.2 m/s
Kinetic energy = mv²/2 = 15.0 * 7.2²/2 = 389 J
51 An electrician has to make eight connections from a switchboard to several outlets. Each
connection requires 50 centimeters of wire. How many meters of wire does the electrician need?
A.4,000 m
B.400 m
C.40 m
D.4 m
Answers
Answer:
Each connection requires 50 centimeters of wire, which is equal to 0.5 meters of wire. Therefore, for eight connections, the electrician would need:
8 * 0.5 = 4 meters of wire
Therefore, the correct answer is option D, 4 m.
: