Answer:
Time Travel Machine
Explanation:
The Hubble Space Telescope can look at galaxies that are many light years away. If it captured an image of a star that was 5 light years away, then that means it took light 5 years to reach the lens of the telescope. So, the image we see is what that star looked like 5 years ago. In other words, it is a glimpse of the past.
An elevator of mass 550 kg and a counter weight of 700 kg lifts 23 tired 80-kg students to the 7th floor of a dormitory 30 meters off the ground in 12 seconds. What is the power required?
(in both W and hp)
elevator of mass 550 kg and a counter weight of 700 kg lifts 23 tired 80-kg students to the 7th floor of a dormitory 30 meters off the ground in 12 seconds. then the power required to lift the 23 students to the 7th floor is 41,948.85 W or 56.22 hp.
To solve this problem, we need to use the formula for power, which is:
Power = Work/Time
We can find the work done by the elevator by using the formula:
Work = Force x Distance
The force required to lift the elevator and the counterweight is:
Force = (mass of elevator + mass of counterweight + mass of students) x g
where g is the acceleration due to gravity, which is approximately 9.81 m/s².
So the force required is:
Force = (550 + 700 + 23 x 80) x 9.81
= 16,779.54 N
The distance traveled by the elevator is 30 meters, so the work done by the elevator is:
Work = Force x Distance
= 16,779.54 x 30
= 503,386.2 J
Now, we can calculate the power required:
Power = Work/Time
= 503,386.2/12
= 41,948.85 W
To convert watts to horsepower, we can use the conversion factor 1 hp = 746 W. Therefore, the power required is:
Power = 41,948.85/746
= 56.22 hp
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At which point does puberty occur for the majority of people?
**NEED ANSWER ASAP, DUE TOMORROW**
Why do astronomers believe the disk formed after the stellar halo? (HINT: What observations do we have to support that?)
Astronomers believe that the disk of the Milky Way galaxy formed after the stellar halo based on several lines of evidence, including observations of the ages and motions of stars in different regions of the galaxy.
What is the evidence of the stars?One key piece of evidence is that the stars in the halo of the Milky Way are generally much older than the stars in the disk. This suggests that the halo formed first, likely through the merging of smaller galaxies or the accretion of gas and stars from the surrounding environment.
Additionally, the stars in the halo of the Milky Way have very different motions than those in the disk. Halo stars tend to move in random, elliptical orbits, while disk stars follow more circular orbits around the center of the galaxy. This difference in motion also supports the idea that the two structures formed at different times and through different processes.
Finally, studies of the chemical composition of stars in the Milky Way also support the idea that the disk formed after the halo. The disk contains a higher proportion of heavy elements than the halo, which suggests that the disk formed from gas that had already been enriched by earlier generations of stars in the halo.
Taken together, these lines of evidence support the idea that the disk of the Milky Way formed after the stellar halo.
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The pressure on each of the tires of a 1500-kg car is 2.2 x 10^5 Pa. If each of the tires shares an equal
load, determine the contact area of each of the tires with the road. Show your work.
Answer:
Use the formula to determine the contact area of each tire with the road.
Area divided by force yields pressure, as the equation suggests.
The weight of the car, which is 1500 kg, exerts a force on an area where pressure is at 2.2 x 10^5 Pa.
Supported by all four tires, we must first determine the total force.
Weight of car is 1500 kg multiplied by 9.8m/s^2 equals =14700 N, also known as total force.
Equally sharing the load, four tires are responsible for supporting the vehicle.
Each tire carries a force that equals the total force divided by 4, which is equivalent to 3675 N as calculated from a total force of 14700 N.
Each tire's contact area with the road can now be calculated.
3675 N divided by 2.2 x 10^5 Pa equals the area. This area can also be described as force divided by pressure.
Approximately 16.7 cm^2 or 1.67 x 10^-2 m^2 is the designated area.
The contact area between the road and each tire measures exactly 16.7 cm^2.
Sam's job at the amusement park is to slow down and bring to a stop the boats in the log ride. If a boat and its riders have a mass of 1000 kg and the boat drifts in at 1.3 m/s how much work does Sam do to stop it?
Sam put in -845 J of work to halt it. Sam had to exert effort in the direction counter to the way the boat was moving, as indicated by the negative sign, which denotes that he did negative work.
How do you figure out how much labor Sam put in?One can compute the initial kinetic energy as follows:
KEi is equal to (1/2)mv2, where m is the combined mass of the boat and its riders (1000 kg), and v is the boat's initial speed (1.3 m/s).
KEi = (1/2)(1000 kg)(1.3 m/s), which equals 845 J.
The boat is brought to a stop, and as a result, its terminal velocity and kinetic energy are both zero:
KEf = 0 J
Sam put forth the following effort to stop the boat: W = 0 J - 845 J
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state two difference between mains electcity and that supplied by 1.5 cell
The two differences between mains electricity and that supplied by a 1.5V cell:
Voltage:Power outputWhat is power output?Power Output means the average rate of electric energy delivery during one Metering Interval.
Power output: Compared to a 1.5V cell, mains electricity has a much greater power output. This is so that more power can be delivered to devices and appliances by mains electricity, which is provided at a higher voltage and current.
Compared to a 1.5V cell, the voltage provided by mains electricity is usually much higher. A 1.5V cell produces DC (direct current) voltage, whereas the mains electricity in the majority of nations is typically supplied at a voltage of 110–120V or 22–240V AC (alternating current). The kinds of devices and appliances that can be powered by mains electricity versus those that can be powered by a 1.5V cell are affected by this difference in voltage levels.
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A 1200 kg wrecking ball hangs from a 14-m-long cable. The ball is pulled back until the cable makes an angle of 19.0 ∘ with the vertical. By how much has the gravitational potential energy of the ball changed?
Explanation:
Seems like there might be an easier way than all of this trig work.....let me know if it is incorrect: ( due to rounding the answer may be 8979 J )
Pre-lubrication of the spindle will help prevent:
a. Spalling
b. Pitting
C. Seal failure
d. Fretting
Answer:
a. Spalling
Ocean waves are hitting a beach at a rate of 35 Hz. What is the period of these waves? A. 3.5 A b. 0.0286 s c. 2.86 A d. 0.0103 s
The period of the ocean waves hitting the beach at a rate of 35 Hz is 0.0286 seconds.
What is the relationship between frequency and period in wave motion?Frequency and period are inversely related in wave motion. The frequency of a wave is the number of complete cycles (or wave crests) that pass a point in a given time period, while the period is the time it takes for one complete cycle to occur. The period can be calculated by dividing the inverse of the frequency.
How do ocean waves form and what factors affect their characteristics?Ocean waves form due to the transfer of energy from wind to water. Factors that affect the characteristics of ocean waves include wind speed and duration, the distance over which the wind blows (known as fetch), and the depth and shape of the seafloor.
The size and shape of ocean waves can also be affected by tides, currents, and the presence of nearby land masses.
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Directions: Participate in a workout of your choice. Evaluate your activity by answering the questions below.
For this workout I did squats. Squats may aid in weight loss because they burn calories. Moreover, they reduce the possibility of knee and ankle injuries.
How did the squat exercise make you feel?When performing squats, your legs should feel fatigued. Lower back ache is a sign that you're likely doing the workout wrong. This shows that your lower back muscles are working harder than your glutes and quadriceps since they are taking the load. Pay attention to how you squat.
Squats are possible everywhere?It doesn't matter where it is—a living room, office, stairwell, park, or closet—as long as there are a few feet available. The only thing you need is your body weight.
Is it acceptable to squat without a spotter?In some instances, it is acceptable to squat without a spotter. The environment and resources you have at your disposal, though, are everything. The safest choice is to use a power rack or squat stand with adjustable safety pins, arms, or straps.
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remembering and forgetting: crash course psychology #14
Crash Course Psychology #14 focuses on the concepts of remembering and forgetting. The episode discusses various aspects of memory, such as encoding, storage, and retrieval. Encoding refers to the process of transforming information into a format that can be stored in the brain, while storage is the preservation of that information over time. Retrieval is the act of accessing and recalling stored information when needed.
Forgetting is a natural part of memory processes and can occur due to factors like decay, interference, and retrieval failure. Decay is the gradual fading of memories over time, while interference involves new information disrupting the recall of older memories. Retrieval failure happens when we are unable to access certain memories, even if they still exist in our brains.
In summary, Crash Course Psychology #14 explores the complex processes of remembering and forgetting, highlighting key concepts such as encoding, storage, retrieval, decay, interference, and retrieval failure.
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a satellite moves in a circular orbit around the earth with speed V- 6000mls. Determine the satellite altitude above the earth surface and the period of the satellite's orbit the earth mass and radius are M= 5.97 x 10²⁴kg and R= 6.378 x 206m.
The satellite's height above the surface of the planet is roughly 35,800 kilometers, and its orbital period is roughly 1.54 hours.
What is speed?An object's speed can be defined as how quickly it is going. It measures how quickly an object travels over time. Typically, speed is measured in terms of time/distance.
How do you determine it?The speed of the satellite must first be converted from miles per second to meters per second:
V= 6000 miles per second = 9656 m/s
The orbital radius of the satellite can then be calculated using the centripetal force equation as follows:
Fc = Fg
Gm M / r² = mv² / r
r = G M / v²
where M is the earth's mass.
By entering the specified values, we obtain:
r = (5.97 x 10²⁴ kg) x (6.67 x 10⁻¹¹N m²/kg²)/ (9656 m/s)
r= 4.22 x 10⁷ meters
Hence, the satellite's height above the surface of the planet is:
height = r - R.
height= (4.22 x 10⁷ m) - (6.378 x 10⁶ m)
height is 3.58 x 10⁷ meters.
Now we can apply the equation for a circular orbit's period:
T = 2π r / v
When we enter the values we just discovered, we obtain:
T = 2π (4.22 x 10⁷ m) / (9656 m/s)
T = 5.56 x 10³ seconds
Hence, the satellite's orbit has a period of about 1.54 hours.
So, the satellite's height above the surface of the planet is roughly 35,800 kilometers, and its orbital period is roughly 1.54 hours.
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Calculate the total force on the Earth due to Venus, Jupiter, and Saturn, assuming all four planets are in a line,(Figure 1). The masses are mV=0.815mE
, mJ=318mE
, mSat
= 95.1mE
, and the mean distances of the four planets from the Sun are 108, 150, 778, and 1430 million km
.
Answer:
To calculate the total force on Earth due to Venus, Jupiter, and Saturn, we need to use the formula for gravitational force: F = G * (m1 * m2) / r^2 where F is the gravitational force, G is the gravitational constant, m1 and m2 are the masses of the two objects, and r is the distance between them. First, we need to convert the distances to meters: dV = 108 million km * 1000 m/km = 1.08 x 10^11 m dJ = 150 million km * 1000 m/km = 1.5 x 10^11 m dSat = 778 million km * 1000 m/km = 7.78 x 10^11 m Next, we can calculate the forces due to each planet: FV =
CPO Science. what is the net force on the refrigerator shown to the right?
The magnitude of the net force is 50N, directed to the right. Since there is no friction, the only horizontal force is due to the applied force. The normal force (directed upward) and the force of gravity (directed downward) exactly cancel out.
Applying pressure to a box will cause it to shift. In physical science, the concept of force is essential. Force is expressed in newtons in the metric system. (N). A tiny measure of energy is a newton. 500–1,000 newtons of energy are needed to lift the average person.
A joule is a unit of energy.
With regard to power and distance, the unit of energy is connected. In order to move something one metre with one newton of power, one joule (J) of energy is required. To drag a small book across a table, a joule of energy is roughly equivalent to that required. You can pull harder or for a longer distance if you have more stamina.
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What is the net force on the refrigerator shown to the right?
200 N
1,000 N
50 N
= Fg
1,000 N = F.
b) Calculate the mass of the refrigerator.
c) What is the refrigerator's acceleration?
Olympic swimmer, Micheal Phelps, swam a 200 meter race in 1 minute and 54 seconds. What would his velocity be in meters/seconds
During the 200-meter race, Michael Phelps moved at a speed of 1.75 metres per second.
What is famous about Michael Phelps?More than any other swimmer in history, he won Olympic medals, world titles, US national titles, and set world records. Phelps has made it a priority to support the growth of swimming at all levels during his career. With a total of 28 medals, he is the most successful and decorated Olympian of all time.
Velocity = Distance / Time
In this case, the distance swum is 200 meters and the time taken is 1 minute and 54 seconds, or 114 seconds.
Velocity = 200 meters / 114 seconds
Velocity = 1.75 meters/second (rounded to two decimal places)
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A massless spring hangs from the ceiling with a small object of 100 g attached to its lower end. The object is initially held at rest at a position such that the spring is at its rest length. The object is then released and oscillates up and down, with its lowest position being 5.0 cm below the initial position. The object's speed at 2 cm below the initial position is:
Group of answer choices
2.23 m/s
14 m/s
0.21 m/s
0.45 m/s
The speed of the object at 2 cm below the initial position is 0.45 m/s when a small object of 100 g attached to its lower end.
Given the mass of small object (m1) = 100g
The distance of object from top of spring (x) = 5cm
The point of length of object (l) = 2cm
the speed of object at 2cm below the initial position is = v
We know that F = Kx where F = mg such that:
mg = kx then [tex]100 * 10^{-3} * 9.8 = k * 5 * 10^{-2[/tex]
k = 19.6
We know that from the conservation of energy,
initial potential energy (Ui) + kinetic energy (K.E) = final PE + KE such that:
[tex]1/2kx^2 - mgx + 1/2mv^2 = 0[/tex]
[tex]1/2 * 19.6 * (0.02)^2 - 0.1 * 9.8 * 0.02 + 1/2 * 0.1 * v^2 = 0[/tex]
[tex]0.00392 - 0.0196 = -0.05v^2[/tex]
[tex]0.3136 = v^2[/tex]
v = 0.45m/s
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What is the best flowers
Answer:
What are the best flowers? (My opinion)
Water liliesWhite rosesHydrangeaExplanation:
You're welcome.
Answer:
Tulips,
Lilies,
Lotuses on my opinion...
Activity log - Low Impact Floor Drill
Record your time and activity below and in your unit fitness log. If a particular category does not apply, leave it blank.
Date:
Warm-up:
Cool-down:
Type of Activity: (Cardiovascular, Muscular, or Flexibility)
Description of Activity and Time:
Intensity Level: (Moderate or Vigorous)
Total Time:
Based on the information, a guide on how to fill out your fitness log is given.
How to write the fitness logDate: Write the current date.
Warm-up: Indicate what type of warm-up exercise you did before the actual activity. For example, you may have stretched or walked briskly for five minutes before starting the actual exercise.
Cool-down: Indicate what type of cool-down exercise you did after the actual activity. For example, you may have stretched or walked slowly for five minutes after completing the actual exercise.
Type of Activity: Choose whether the exercise you did is cardiovascular, muscular, or flexibility training.
Description of Activity and Time: Provide a brief description of the exercise you did and how long you did it. For instance, if you did a low-impact floor drill for 30 minutes, write "Low-impact floor drill for 30 minutes."
Intensity Level: Choose whether the exercise was moderate or vigorous.
Total Time: Write the total time you spent doing the exercise, including warm-up and cool-down. For example, if you spent five minutes warming up, 30 minutes doing the actual exercise, and five minutes cooling down, write "40 minutes" as the total time.
Remember to update your fitness log regularly to monitor your progress and achieve your fitness goals.
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A wave with a frequency of 12 Hz has a wavelength of 3 meters. At what speed will this wave travel?
Explanation:
speed = wavelength * frequency
= 3 m * 12 /s = 36 m/s
A 9.00 kg object is dropped from rest near the surface of an unknown planet and begins to accelerate at 6.00 m/s2. What is the weight of the object on the unknown planet? (*Remember* F=ma)
Answer:
Explanation:
since weight and force both are forces we can simply use the equation
F=ma
here ,
m=mass=9.00kg
a=acceleration=6.00m/s^2
So,
F=W=54N
(c)
If an electron described a complete revolution in a
magnetic field, how much energy would it acquire?
An electron moving transverse to a uniform magnetic field, where there is nothing to interfere with its motion (such as air molecules), will continuously describe complete revolutions with no effort. That is, the electron does not gain energy (and the field does not lose energy).
When it comes to moving electric charges, electric currents, and magnetic materials, a magnetic field is a vector field that defines the magnetic influence. A force perpendicular to both the charge's own motion and the magnetic field acts on a moving charge in the field of magnetism.[1]: ch13 [3]: 278 Iron and other ferromagnetic elements are drawn to a permanent magnet's magnetic field, which also draws or repels other magnets. The three other magnetic effects of paramagnetism, diamagnetism, and antiferromagnetism also impose minute forces on materials that are considered to be "nonmagnetic"; however, these forces are typically so minute that they can only be detected by laboratory equipment. Magnetic fields encircle magnetised materials and are produced by electric currents, like those found in electromagnets, and by electric fields with changing time constants.
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Spectroscopy has much in common with what other cosmological concepts?
O
redshift and blueshift
gravity and weight
dark matter and dark energy
speed and velocity
Spectroscopy has much in common with the cosmological concept of redshift and blueshift.
What is Spectroscopy?Spectroscopy is the study of the interaction between matter and electromagnetic radiation, and it is commonly used to study the properties of stars and galaxies.
Redshift and blueshift, on the other hand, are phenomena that occur when light is emitted from an object that is moving away or towards an observer, respectively. These concepts are commonly used in cosmology to study the expansion of the universe and the motion of galaxies.
Spectroscopy can be used to measure the redshift or blueshift of light emitted from distant objects, providing valuable information about their distance, velocity, and composition.
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Thunder was heard 2second after the lightening .if the velocity of sound is 350m/s,how far is the lightening
Thunder was heard 2second after the lightening .if the velocity of sound is 350m/s, the lightening is about 700 meters far.
The meter's definition, please.In international agreement in 1983, the meter was redefined as the distance that light would travel in a vacuum within 1/299,792,458 of both a second, building on these and other advancements. In a vacuum, this definition also fixed the light's speed at 299,792,458 meters a second.
In terms of measurement, what does the word "meter" mean?
A typical metric unit called a meter is equivalent to around 3 feet, 3 inches. This indicates that metric measurement system includes the meter. Objects about one meter long include guitars, baseball bats, & yard poles. In athletic competitions like running and swimming, distances are also measured in meters.
The distance between the viewer and the lightning is about 700 meters.
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Internal energy is affected by two properties of the particles which make up a substance. Identify the two properties. A. Motion and position B. Acceleration and mass C. Specific heat capacity and volume D. State of matter and potential energy
The two properties of particles which make up a substance that affect its internal energy are:
A. Motion and position
The internal energy of a substance depends on the kinetic energy (motion) and potential energy (position) of its constituent particles. The kinetic energy of the particles determines the temperature of the substance, while the potential energy depends on the intermolecular forces between the particles.
Therefore, option A is the correct answer.
Some solar panels have a total area of 12 m2 . Each 1.0 m2 of the panels receives 0.85 kJ of energy from the Sun in 1.0 s. The efficiency of the panels is 16%. How much power do they produce?
The solar panels produce 1.632 kW of power.
The first step is to calculate the total energy received by the solar panels per second. To do this, we need to multiply the total area of the solar panels by the energy received per unit area and the efficiency of the panels. The efficiency takes into account any losses due to conversion of the energy into electrical power.
We are given that each 1.0 m2 of the panels receives 0.85 kJ of energy from the Sun in 1.0 s. Therefore, we can calculate the energy received by the 12 m2 of panels as:
energy received = area x energy per unit area
energy received = 12 m2 x 0.85 kJ/m2
energy received = 10.2 kJ
If the efficiency of the panels is 16%, then the power they produce is:
Power = (Efficiency × Energy) / Time
Power = (0.16 × 10.2 kJ) / 1.0 s
Power = 1.632 kW
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Ap Dorji switched on the TV to watch the live coverage of the National Day Celebration. 10 kJ of light energy output 30 kJ of sound energy output 720 kJ of electrical energy input Calculate the efficiency of the TV
The TV's efficiency rating is 5.56%.
Does the concept of conservation of energy stipulate that the total amount of energy in a closed system stays constant?An isolated system has a constant total energy. Energy cannot be generated or destroyed; it can only be transformed from one form to another or transferred between systems. When all energy sources are considered, the overall energy of an isolated system is constant.
Efficiency is equal to (useful energy output/total energy intake) multiplied by 100%.
Useful energy output = light energy output + sound energy output
= 10 kJ + 30 kJ
= 40 kJ
Total energy input = electrical energy input
= 720 kJ
Substituting these values into the efficiency formula, we get:
Efficiency = (40 kJ / 720 kJ) x 100%
= 0.0556 x 100%
= 5.56%
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Find the force of gravity between a newborn baby (mass = 3.5 kg
) and planet Mars (mass = 6.4×1023kg
) when Mars is at its closest to Earth (distance = 5.6×1010m
).
For solving this problem,we have to apply Newton’s law of gravitation which defines the magnitude of the force between two objects.
Gravitational Force -
[tex]\:\:\:\:\:\:\:\sf \underline{\boxed{\sf{F=G\times \dfrac{ \: m_1 \: m_2}{r^2}}}}[/tex]
Where:-
F = Force of gravity.G = Gravitational constant.(Which is 6.7 × 10⁻¹¹ Nm² kg⁻²)m₁ = Mass of one object.m₂ = Mass of the other object.r = Distance between the two objectsAs per question, we are given -
Mass of newborn baby, m₁ = 3.5kgMass of Mars, m₂ = 6.4×10²³ kgDistance, r = 5.6 ×10¹⁰mNow that required values are given, so we can substitute the values into the formula and solve for Force of gravity:-
[tex] \:\:\:\:\:\:\:\longrightarrow \sf Force_{(gravity) }= 6.7\times 10^{-11} \times \dfrac{3.5\times 6.4\times 10^{23}}{(5.6\times 10^{10})^2}\\[/tex]
[tex] \:\:\:\:\:\:\:\longrightarrow \sf Force_{(gravity) }=6.7\times 10^{-11} \times \dfrac{1400.46}{23172.08}\\[/tex]
[tex] \:\:\:\:\:\:\:\longrightarrow \sf Force_{(gravity) }=6.7\times 10^{-11} \times 0.06\\[/tex]
[tex] \:\:\:\:\:\:\:\longrightarrow \sf \underline{Force_{(gravity) } = 4.02\times 10^{-12}\:N}\\[/tex]
Therefore, the force of gravitation between newborn baby and Mars is 4.02 × 10⁻¹² N.When an individual stops working out, muscles slowly
A.
B.
C.
D
strengthen
turn into fat
lose strength
stretch out
Please select the best answer from the choices provided
A
When an individual stops working out, muscles slowly lose strength (option C).
What is work out?Working out means to strengthen or improve a part of one’s body by exercise.
Exercise is any activity intended to improve physical, or sometimes mental, strength and fitness.
Many at times, exercises carried out by individuals leads to build up of muscles. However, when they stop working out, this muscle loses strength.
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Organize the information on atomic mass to complete the outline.
Atomic mass is the mass of an atom of a chemical substance shown in atomic mass units (amu). It is the sum of the masses of protons, neutrons, and electrons in an atom.
What are protons, neutrons, mass number and atomic mass?Protons are subatomic particles with a positive charge. The total number of protons in an atom ascertains its atomic number. The nucleus of an atom contains both protons and neutrons and the latter does not have any charge. Mass number is the sum total of the number of protons and number of neutrons in an atom. Mass number is expressed as a whole number and is specific to each isotope.
Atomic mass is usually measured relative to the mass of a carbon-12 atom, which is assigned a mass of exactly 12 atomic mass units. This means that the atomic mass of other elements is given in relation to the mass of carbon-12.
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Vector A has x and y components of - 3m and 10m respectively. Vector B has x and y components of 8.5m and - 3.5m respectively. If 2A-B-4C=0. Calculate the component of vector C.
Therefore, the component of vector C is -4.125m in the x direction and 6.125m in the y direction.
What does a physics vector look like?Physical objects called vectors need both magnitude and direction. Scalars include things like height, mass, area, and volume. Vectors can take the forms of motion, velocity, and acceleration.
In order to find vector C, we can commence by rearranging the equation 2A - B - 4C = 0:
2A - B - 4C = 0
2A - B = 4C
C = (2A - B)/4
We can now determine the elements of vectors A and B:
Vector A: Ax = -3m, Ay = 10m
Vector B: Bx = 8.5m, By = -3.5m
When we enter these numbers into the vector C equation, we obtain:
Cx = (2Ax - Bx)/4 = (2(-3m) - 8.5m)/4 = -4.125m
Cy = (2Ay - By)/4 = (2(10m) - (-3.5m))/4 = 6.125m
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