Half of 87.3 km is 43.65 km.
To convert km to cm, we need to multiply by 100,000 (since there are 100,000 cm in 1 km).
So, 43.65 km = 43.65 x 100,000 = 4,365,000 cm.
To express the answer in multiples of 108 cm, we need to divide by 108 and round to four decimal places.
4,365,000 cm ÷ 108 = 40,416.6667
Rounding to four decimal places gives us 40.4167.
Therefore, half of an 87.3 km road is approximately 40.4167 x 108 cm.
please help PLEASE NOW
Journal prompt to be answered in 2 fully developed paragraphs
Prompt: What are some products (or programs) that you could purchase to help your performance in your current physical activity? How would the product (or program help)? Do you really think it is effective? Use specific examples from your experience.
You could purchase a fitness tracker to help your performance in your current physical activity.
Fitness tracker would help you in the area of goal setting.
Fitness trackers are effective because they have helped my friends to improve workout routine.
What are some products and programs that do help to physical activity?Wearable fitness trackers can monitor data like heart rate, number of steps taken, distance traveled, and number of calories burned.
Supplements including protein powders, creatine, and beta-alanine can enhance recovery, muscular growth, and endurance.
Working with a coach or personal trainer can help you attain your fitness objectives by offering personalized training regimens, comments on form and technique, and accountability.
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3. Would you expect a system with objects that have an equal amount of positive and negative
charge to have a large amount of electric potential energy? Why or why not?
Yes, I would expect a system with objects that have an equal amount of positive and negative charge to have a large amount of electric potential energy.
Why I will expect equal positive and negative chargeThis is because the electric potential energy of a system of charges is proportional to the product of the charges and inversely proportional to the distance between them. When positive and negative charges are brought close together, the electric potential energy of the system increases because the charges are attracted to each other due to their opposite charges.
As the charges get closer together, the electric potential energy of the system increases even more, because the charges are closer to each other and their attraction is stronger.
Therefore, when there are equal amounts of positive and negative charges in a system, the electric potential energy of the system will be high because there will be many oppositely charged pairs of particles that are close together and attracting each other strongly.
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How does the frequency of a string affect its wavelength?
Answer:
As the frequency goes down, the speed goes down by the same factor, and so the wavelength doesn't change
Explanation:
How long will the light take in travelling a distance of 500 m in water refractive index of water is 1.33 and velocity of light in vacuum is 3 × 108 m/s. [2] Ans: 2.2 x 10 s
The light will take 2.2 μs in travelling a distance of 500 m in water refractive index of water is 1.33 and velocity of light in vacuum is 3 × 10⁸ m/s.
When a light is going from medium 1 to medium 2. The refractive index is defined as a ratio of velocity of light in medium 1 to velocity of light in medium 2. Refractive index is the factor which deals with the amount of bending of light. More refractive index means more it will bend in the medium 2. When it is 1 we can say that light has not been bent.
refractive idex of the medium is given by,
μ = velocity of light in vacuum/ velocity of light in medium
velocity of light in water = velocity of light in vacuum/ μ
velocity of light in water = 3 × 10⁸ m/s. / 1.33
velocity of light in water = 2.25 × 10⁸ m/s
Time = distance/velocity
Time = 500 m / 2.25 × 10⁸ m/s
time = 222 × 10⁸ s
time = 2.2 μs
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A clown figurine is located 21.0 cm in front of a thin lens that has a focal length of 17.0 cm. Where would the image appear, and would it be real or virtual?
15.2 cm, virtual
89.3 cm, real
111 cm, real
−65.2 cm, virtual
Ocean waves are observed to travel along the water surface during a developing storm. A Coast Guard weather station observes that there is a vertical distance from high point to low point of 2.2 meters and a horizontal distance of 4 meters between adjacent crests. The waves splash into the station once every 4 seconds. Determine the frequency and the speed of these waves.
Frequency= _________________________, speed = _______________________
The frequency of the waves is 0.25 Hz and the speed of the waves will be 1 m/s.
The distance between adjacent crests is called the wavelength, represented by the symbol λ. In this case, the wavelength is 4 meters.
The vertical distance between the high point (crest) and the low point (trough) is called the amplitude, represented by the symbol A. In this case, the amplitude is 2.2 meters.
The time it takes for one wave to pass a fixed point is called the period, represented by the symbol T. In this case, the period is 4 seconds.
The frequency of the waves is the number of waves that pass a fixed point in one second, represented by the symbol f. It is the reciprocal of the period, so:
f = 1 / T = 1 / 4 = 0.25 Hz
The speed of the waves can be calculated using the wave equation:
v = fλ
where v is the speed of the waves. Substituting the values we have:
v = (0.25 Hz)(4 m) = 1 m/s
Therefore, the frequency of the waves is 0.25 Hz and the speed of the waves is 1 m/s.
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When light is restricted to oscillating in a single plane, that is known as
diffraction
dispersion
interference
polarization
the answer is polarization.
A team of astronauts is on a mission to land on and explore a large asteroid. In addition to collecting samples and performing experiments, one of their tasks is to demonstrate the concept of the escape speed by throwing rocks straight up at various initial speeds. With what minimum initial speed esc will the rocks need to be thrown in order for them never to "fall" back to the asteroid? Assume that the asteroid is approximately spherical, with an average density =2.02×106 g/m3 and volume =1.71×1012 m3.Recall that the universal gravitational constant is =6.67×10−11 N·m2/kg2.
A 5.0 kg block and a 4.0 kg block are connected by a 0.6 kg rod. The links between the blocks and the rod are denoted by A and B. A force F is applied to the upper block.
In Figure 4.2, the blocks and rod assembly move downward at constant velocity. The applied force F is closest to:
a)88 N
b)90 N
c)92 N
d)94 N
e)96 N
Answer::
D) 94 N
F = M a = (5.0 + 4.0 + .6) a
a = 9.80 m/s^2 since only acceleration is gravitational
F = 9.6 * 9.8 = 94 N
What evidence supports the idea that the universe is expanding in all
directions?
O A. Cosmic background radiation
OB. Nuclear fusion in stars
O C. Nucleosynthesis
D. Redshift
Answer:
D. red shift
Explaination: if the spectral lines of galaxy are shifted towards the red end of spectrum (red shift) it means the galaxy is going away from earth!
5. A child wanting to make a cordial ice block, places 200g of cordial at 25°C in the freezer. If the freezer can remove energy at the rate of 250 joules per second, what time will it take for the cordial to freeze? (Assume the specific latent heat and specific heat capacity of cordial are the same as water.)
The time taken for the cordial to freeze is 267.2 s.
What is the time taken for the cordial to freeze?The amount of heat energy (Q) required to freeze the cordial can be calculated using the following formula:
Q = ml
where;
m is the massl is the latent heat of fusion of iceQ = 334 J/g x 200 g
Q = 66,800 J
The time taken for the cordial to freeze is calculated as;
t = Q/W
where;
W is the rate of energy removal or powert is timet = (66,800 J) / (250 J/s)
t = 267.2 s
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Which model of the universe is the most widely accepted, and what does it
predict?
A. An open universe, in which the universe never stops expanding
B. A flat universe, in which the universe stops expanding but does not
contract
C. A closed universe, in which the universe stops expanding but does
not contract
OD. A closed universe, in which the universe never stops expanding
can someone please explain Question 1 a and e go to me :) ?
i have the answers. i just don't understand why the answers are what they are.
In the context of a scientific investigation, it is often important to provide accurate measurements. In this particular case, the mass of water used in the investigation is 0.05 kg.
How to calculate the massEnergy transferred = mass × specific heat capacity × temperature change
E = m × c × ΔT
We can rearrange this equation to solve for the mass of water:
m = E / (c × ΔT)
Substituting the given values, we get:
m = 1050 J / (4200 J/kg·°C × 0.6 °C) = 0.05 kg
Therefore, the mass of water used in the investigation is 0.05 kg.
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what are the disadvantages of moving with the speed of light or even faster
For mass-containing things, it is impossible to move at or faster than the speed of light. Potential drawbacks include length contraction, time dilation, mass gain, gravitational effects, and high energy demands.
Why is travelling at the speed of light problematic?If an object could ever move at the speed of light, its mass would become infinite. The required energy would therefore have to be infinite, which is not possible.
What are the drawbacks of speed?The risk to other road users increases as you drive faster. Overspeeding cars put pedestrians in a very dangerous situation. Driving too quickly uses more fuel. After the speed reached a certain point, fuel usage skyrocketed.
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16. Other things constant, what do you expect will happen in the next 50 years to the relative demand for each of the following. a. Nursing homes. Demand b. Baby high chairs. Demand Price Price
The thing that I expect will happen in th the below is each of the following.
Nursing Homes: Demand for nursing homes is likely to increase in the next 50 years due to the aging population. Baby High Chairs: Demand for baby high chairs may increase or decrease depending on demographic and lifestyle trends. What is the justification?With regards to Nursing Homes as the population ages, there will certainly be a greater demand for nursing homes during the next 50 years. The need for long-term care facilities is anticipated to increase as people live longer. More patients might need specialized care that can only be offered in a nursing home setting as medical technology advances. However, future changes to healthcare and governmental policy may also have an impact on the demand for nursing homes.
Baby High Chairs depending on demographic and lifestyle trends, demand for baby high chairs may rise or fall. Baby high chairs may become less popular if birth rates keep falling or if parents choose more adaptable seating solutions. However, if more parents opt to
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There are two major types of data storage: Hard copy (paper) and digital storage. Both have strengths and weaknesses. Which do you think is better and why?
Your response should be 3-5 sentences long
Answer:
Both hard copy and digital storage have their own advantages and disadvantages, and which one is better largely depends on the specific use case and personal preferences. Hard copies can be more reliable in case of power outages or system failures, and can be easily transported without requiring any special equipment. Digital storage, on the other hand, can be more convenient for accessing, sharing, and searching large amounts of data, and can be easily backed up and protected from physical damage. Ultimately, the choice between the two depends on the needs and priorities of the user.
Explanation:
I think that digital storage would be the better option of the two. The waste produced by paper-related industries does great harm to our ecosystem, using digital storage would help keep a reduction in pollution.
Also, having a hard copy paper, you might misplace and lose it. If you use digital storage you have easy access and retrieval. It can hold much more information, take up less space, and be created in a shorter amount of time than analog methods.
You decide to use your body as a Carnot heat engine. The operating gas is in a tube with one end in your mouth (where the temperature is 37.0 ∘C) and the other end at the surface of your skin, at 30.0 ∘C.
How much heat input is needed to accomplish the lift?
The question is incomplete, I think the question is:
You decide to use your body as a Carnot heat engine. The operating gas is in a tube with one end in your mouth (where the temperature is 37.0 ∘C) and the other end at the surface of your skin, at 30.0 ∘C.(a) What is the maximum efficiency of such a heat engine? Would it be a very useful engine? (b) Suppose you want to use this human engine to lift a 2.50kg box from the floor to a tabletop 1.20m above the floor. How much must you increase the gravitational potential energy, and how much heat input is needed to accomplish this? (c) How many 350-calorie (those are food calories, remember) candy bars must you eat to lift the box in this way? Recall that 80% of the food energy goes into heat.
We need to input about 1278 J of heat into the heat engine to lift the box, and we need to eat about 1.09 candy bars to lift the box
The Carnot heat engine is an idealized thermodynamic cycle that operates between two heat reservoirs and achieves the maximum possible efficiency. It is a theoretical model used to study the behavior of real-world heat engines and provides a benchmark for their performance.
a) The maximum efficiency of a Carnot heat engine is given by the equation:
η = 1 - Tc/Th
where η is the efficiency, Tc is the temperature of the cold reservoir (in this case, 30.0 °C), and Th is the temperature of the hot reservoir (in this case, 37.0 °C).
Plugging in the numbers, we get:
η = 1 - 303 K/310 K ≈ 0.023 or 2.3%
This is a very low efficiency, and the heat engine would not be very useful for doing work.
b) To lift a 2.50 kg box from the floor to a tabletop 1.20 m above the floor, we need to increase its gravitational potential energy by:
ΔPE = mgh
where m is the mass of the box, g is the acceleration due to gravity (9.81 m/s^2), and h is the height the box is lifted.
Plugging in the numbers, we get:
ΔPE = (2.50 kg)(9.81 m/s^2)(1.20 m) ≈ 29.4 J
To accomplish this, we need to input heat Q into the heat engine. Since the efficiency of the heat engine is only 2.3%, the amount of heat needed is:
Q = ΔPE/η = (29.4 J)/(0.023) ≈ 1278 J
So we need to input about 1278 J of heat into the heat engine to lift the box.
c) To input 1278 J of heat into the heat engine, we need to consume food with a total energy content of:
E = Q/ηfood
where ηfood is the efficiency of converting food energy into heat energy. Since 80% of the food energy goes into heat, we have:
ηfood = 0.80
Plugging in the numbers, we get:
E = (1278 J)/(0.80) ≈ 1598 J
To convert this energy content into calories, we divide by 4.184 J/cal, giving:
E = 381 cal
Finally, to determine the number of 350 calorie candy bars needed, we divide the total energy content by the energy content per candy bar:
N = E/Ebar
where Ebar is the energy content of a single candy bar (350 cal). Plugging in the numbers, we get:
N = (381 cal)/(350 cal/bar) ≈ 1.09 bars
So we need to eat about 1.09 candy bars to lift the box.
Therefore, To lift the box, we must put approximately 1278 J of heat into the heat engine and consume approximately 1.09 candy bars.
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In a parallel circuit, the current amplitude is the same through the inductor branch, the capacitor branch, and the resisitor branch. For this circuit, L =
20.0 mH and C = 10.0 mF.
a. What is the source angular frequency?
b. What is the resistance of the resistor?
part a.
The source angular frequency is 2.23 rad/s.
part b.
The resistance of the resistor is 4.46 Ω.
How do we calculate?The source angular frequency is given as:
ω = 1/√(LC)
where = is the inductance,
C = capacitance,
ω= angular frequency.
Substituting the values, we have:
ω = 1/√(20.0 mH x 10.0 mF) = 1/√(0.2) = 1/0.447 = 2.23 rad/s
part b.
We use the impedance in a parallel RLC circuit:
Z = R/(1 - ω^2LC)
impedance of the inductor branch is given as:
Z = jωL
impedance of the capacitor branch :
Z = -j/(ωC)
impedance of the resistor branch :
Z = R
We set all the impedances together at:
jωL = -j/(ωC) = R
We now solve for
R = ωL/ωC
R = = (2.23 rad/s)(20.0 mH)/(10.0 mF)(2.23 rad/s)
R = 4.46 Ω
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Would two observers standing on opposite sides of the truck hear the same pitch at the same time? Explain.
No, two observers standing on opposite sides of the truck would not hear the same pitch at the same time.
Why are sound wavelengths different?This is due to the fact that the sound waves produced by the truck's horn would move at a specific pace that would be constant for both viewers. The distance between the horn and each viewer, however, fluctuates as the truck passes the two people, resulting in a variation in the amount of time it takes for the sound waves to reach each person.
The Doppler effect, which comes from this change in time, changes how the sound waves are perceived in terms of pitch. To be more precise, the observer in front of the truck would hear a higher pitch (shorter wavelength) and the observer behind the truck would hear a lower pitch (longer wavelength).
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Before taking a personality test, Jackie sets her mind on growth. How might this affect her understanding of the test?
Choose two anSwers-
1.She will score high in the areas she chooses to.
2.She will respond based on what's best in her desired career path.
3. She will think of the results as an opportunity to find joy.
4. She will identify areas for self- development in her results.
Answer:
The two answers that are likely to be true are:
She will think of the results as an opportunity to find joy.
She will identify areas for self-development in her results.
By setting her mind on growth, Jackie is likely to approach the personality test with a positive and open mindset. This can lead to the following outcomes:
She will think of the results as an opportunity to find joy: Jackie may view the test results as a chance to discover aspects of her personality that bring her joy and satisfaction. She might focus on finding strengths and positive qualities that can contribute to her personal and professional growth.
She will identify areas for self-development in her results: Rather than viewing the test results as fixed labels or limitations, Jackie is likely to see them as valuable feedback for self-improvement. She may actively seek out areas where she can further develop her skills, knowledge, and personality traits to enhance her personal and career growth.
It's important to note that the other options listed in the question (1. She will score high in the areas she chooses to and 2. She will respond based on what's best in her desired career path) are not directly related to having a growth mindset. They suggest a more biased or strategic approach to the test, which may not align with the concept of growth and self-improvement.
b) A rocket initially moving at v0=3.5 km/s in space fires its engines. The initial mass of rocket is m0=200,000 kg and the final mass of the rocket is m=20,000 kg. If the exhaust velocity is ve=5.2 km/s, calculate the final speed in km/s.
The final speed of the rocket is -11.8 km/s.
What is the final speed of the rocket?The final speed of the rocket is calculated by applying the principle of conservation of linear momentum.
m0v0 = mv + (m0 - m)ve
where;
m0 is initial massv0 is the initial speedve is exhaust velocityThe final speed of the rocket is calculated as;
200,000 kg x 3.5 km/s = 20,000 kg x v + (200,000 kg - 20,000 kg) x 5.2 km/s
700,000 = 20,000v + 936,000
v = -236,000/20,000
v = -11.8 km/s
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apart from inital temperature and room temperature suggest any other factor that should be kept the same to ensure that similar temperature readings are obtained
Answer: the quantity of the substance being measured and make sure to stir the substance before taking the readings, also make your eyesight perpendicular to the scale reading to avoid parallax error
Explanation:
Sonography uses infrasonic waves to create images of objects found inside other objects.
True
False
The statement that Sonography uses infrasonic waves to create images of objects found inside other objects is false.
What is Sonography?Sonography, also known as ultrasound imaging, uses high-frequency sound waves (not infrasonic waves) to create images of objects found inside other objects. These sound waves are emitted by a transducer, which is placed on the skin or inserted into a body cavity, and are reflected off internal structures such as organs, tissues, and fluids.
The reflected sound waves are then detected by the transducer and used to create a real-time image of the internal structures.Ultrasound waves are typically in the range of 2 to 18 megahertz (MHz), which is above the range of human hearing.
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A boy of mass 60 kg and a girl of mass 40 kg are together and at rest on a frozen pond. What is the initial momentum of the girl?
A. 100 kgm/s
B. 40 kgm/s
C. 10 kgm/s
D. 0 kgm/s
Answer:
Explanation:
The answer is D. 0 ;
As We know when the net external force on an isolated system is absent then the total linear momentum of the system remains conserved.
=> By Conservation of linear Momentum of the system;
=> P1=P2 i.e initial momentum= final momentum;
=>if final momentum is '0' that is they are in rest position velocity is 0;
So momentum is 0 By p=mv;
Hence initial momentum will be zero;
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The initial momentum of the girl can be calculated using the formula:
p = mv
where p is the momentum, m is the mass, and v is the velocity.
Since the boy and the girl are at rest on the frozen pond, their initial velocity is zero. Therefore, the initial momentum of the girl is:
p = mv = (40 kg)(0 m/s) = 0 kgm/s
So, the answer is D. 0 kgm/s.
Which word best completes the analogy?
Health-related fitness is to health as skill-related fitness is to _____.
A.
exercise
B.
wellness
C.
performance
D.
fitness
The word that best completes the analogy Health-related fitness is to health as skill-related fitness is to is option C which is performance.
Performance explained.
In health and fitness, performance refers to an individual's ability to carry out physical activities or exercises with efficiency and effectiveness, which are key components of skill-related fitness. Good performance in health and fitness can be measured by various parameters, such as strength, endurance, flexibility, balance, coordination, and speed. For example, a good performance in running can be measured by the ability to run a certain distance in a shorter time or maintaining a specific pace for a longer time. Similarly, a good performance in weightlifting can be measured by the ability to lift a certain weight with proper form and technique.
In general, good performance in health and fitness is associated with better overall physical health, reduced risk of chronic diseases, and improved quality of life.
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What is the current theory about the formation of the solar system?
Responses
About 14 billion years ago, several supernova events scattered all the known elements throughout the galaxy. The magnetic elements were attracted to each other and formed the early celestial bodies that eventually became the planets of the solar system.
About 14 billion years ago, several supernova events scattered all the known elements throughout the galaxy. The magnetic elements were attracted to each other and formed the early celestial bodies that eventually became the planets of the solar system.
A big bang occurred in the solar system as a result of a fusion reaction. All the matter in the solar system that had been clumped together was shattered and sent flying. As new pieces of matter connected, all the celestial bodies of the solar system were formed.
A big bang occurred in the solar system as a result of a fusion reaction. All the matter in the solar system that had been clumped together was shattered and sent flying. As new pieces of matter connected, all the celestial bodies of the solar system were formed.
The area of the universe that was to become the solar system went through a period of vast expansion as a result of rapid radioactive decay that left behind clouds of dust and gases. The excess clouds and gases were used to form the various parts of the solar system.
The area of the universe that was to become the solar system went through a period of vast expansion as a result of rapid radioactive decay that left behind clouds of dust and gases. The excess clouds and gases were used to form the various parts of the solar system.
The solar system began as a cloud of dust and gas that condensed, forming a bulging middle and an outer disk. The bulging middle of the cloud became the sun, and the rest of the dust and gas formed the planets, orbiting the sun in the same plane.
The current theory about the formation of the solar system is that it began as a cloud of dust and gas, known as the solar nebula which is the last response.
What happened to the nebula?The nebula collapsed under its own gravity, forming a spinning disk with a bulging middle that became the sun. The remaining dust and gas in the disk coalesced into small bodies, which collided and stuck together, forming the planets.
This process, known as accretion, resulted in the four inner planets, which are small and rocky, and the four outer planets, which are large and gas-rich.
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what is gravitatinal force ?
Answer: The force of gravity, or gravitational force, pulls objects with mass toward each other.
We often think about the force of gravity from Earth. This force is what keeps your body on the ground.
But any object with mass exerts a gravitational force on all other objects with mass. For example, there is a gravitational force between you and every object around you.
The gravitational force between two objects is larger when the masses of the objects are larger. That’s why you can feel the gravitational force between you and Earth, but the force between you and objects with smaller masses is too weak to feel.
The gravitational force between two objects also depends on the distance between their centers. The further objects are from one another, the weaker the force is.
A bicyclist travels 69.05 kilometers in 4.332 hours. What is the cyclist's average speed?
Answer:
v = 15.939 km/h
Explanation:
distance (d) = 69.05 km
time (t) = 4.332 hours
Speed (v) = ?
v = d / t
v = 69.05 / 4.332
v = 15.939 km/h
What is the breaking rate? How does the breaking rate comapre to the acceleration
( the velocity decreases until it comes to stop)
Velocity (m/s)
50
40
30
20
10
0
0
Time (s)
10
The breaking rate refers to the rate at which an object slows down due to braking or deceleration. In other words, it is the rate of change of velocity in the opposite direction of the object's motion.
How to calculate the breaking rate?Looking at the data provided, we can see that the velocity decreases from 50 m/s to 0 m/s over a period of 10 seconds, which means the object is decelerating at a constant rate. To calculate the breaking rate, we can use the formula:
breaking rate = (final velocity - initial velocity) / time taken
In this case, the breaking rate is:
breaking rate = (0 - 50) / 10 = -5 m/s^2
So, the object is decelerating at a rate of 5 m/s^2.
To compare this to the acceleration, we need to know the acceleration of the object before it starts breaking. If we assume that the object was accelerating at a constant rate of 5 m/s^2 before it started breaking, then the acceleration and breaking rates are equal in magnitude but opposite in direction. In other words, the acceleration and breaking rates are both 5 m/s^2, but the acceleration is positive while the breaking rate is negative.
It's worth noting that the breaking rate can vary depending on various factors such as the mass of the object, the friction between the object and the surface it is moving on, and the force applied to the brakes.
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Find the induced voltage in the conductor of the Figure below where B = 0.04 ay Tan
U = 2.5 sin 103t az m/s.
The induced e.m.f is -0.02sin(10^3t) (V) which is option D
What is Induced Voltage?Induced voltage refers to the electrical voltage that is generated in a conductor or coil due to a changing magnetic field.
This phenomenon is known as electromagnetic induction and is the basis for many electrical devices such as generators and transformers.
Induced voltage can be calculated using Faraday's law, which states that the induced electromotive force (EMF) is equal to the rate of change of magnetic flux.
The induced voltage can be either positive or negative depending on the direction of the changing magnetic field and the orientation of the conductor or coil.
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