A uniform beam having a mass of 60 kg and a length of 2.8 m is held in place at its lower end by a pin. Its upper end leans against a vertical frictionless wall as shown in the figure. What is the magnitude of the force the pin exerts on the beam?
Select one:
a.
0.68 kN
b.
0.57 kN
c.
0.74 kN
d.
0.63 kN
e.
0.35 kN
The magnitude of the force the pin exerts on the beam is approximately A, 0.6 kN.
How to determine magnitude?To determine the magnitude of the force the pin exerts on the beam, analyze the forces acting on the beam.
Considering the equilibrium of the beam, the forces acting on it include:
The weight of the beam acting downward (Wb = mass × acceleration due to gravity).
The normal force exerted by the pin acting upward (N).
The force exerted by the wall acting perpendicular to the wall (F).
Since the beam is in equilibrium, the sum of the vertical forces must be zero. This gives us the equation:
N - Wb = 0
The weight of the beam can be calculated as follows:
Wb = mass × acceleration due to gravity
Wb = 60 kg × 9.8 m/s²
Substituting the values into the equation:
N - (60 kg × 9.8 m/s²) = 0
Solving for N, the normal force exerted by the pin:
N = 60 kg × 9.8 m/s²
Calculating the value:
N ≈ 588 N
Converting the value to kilonewtons (kN), divide by 1000:
N ≈ 0.588 kN
Therefore, the magnitude of the force the pin exerts on the beam is approximately 0.588 kN.
The closest option from the given choices is (a) 0.68 kN.
Find out more on magnitude here: https://brainly.com/question/24468862
#SPJ1
Nonreflective coatings on camera lenses reduce the loss of light at the surfaces of multilens systems and prevent internal reflections that might mar the image. Find the minimum thickness of a layer of magnesium fluoride (n = 1.38) on flint glass (n = 1.66) that will cause destructive interference of reflected light of wavelength 480 nm near the middle of the visible spectrum.
The minimum thickness of the magnesium fluoride layer that will cause destructive interference of reflected light with a wavelength of 480 nm is 86.9 nm
How do we sole for the minimum thickness that will cause destructive interference ?To find minimum thickness of a non-reflective coating that causes destructive interference we use the formula t = (mλ) / (4n)
The wavelength (λ) of the light is 480 nm
the refractive index (n) of magnesium fluoride is 1.38,
we can calculate the minimum thickness (t) by saying
t = 0 × 480 / 4 × 1.38
t = 0 nm
t = 1 × 480 nm / 4 × 1.38
t = 480 nm / 5.52
t = 86.96 nm
Find more exercises on finding minimum thickness;
https://brainly.com/question/30388201
#SPJ1
A planet has two moons, Moon A and Moon B, that orbit at different distances from the planet’s center, as shown. Astronomers collect data regarding the planet, the two moons, and their obits. The astronomers are able to estimate the planet’s radius and mass.
What additional information is needed to determine the time required for one of the moons to make one complete revolution around the planet?
The additional information needed to determine time required for one of the moons to make one complete revolution around the planet is distance between centre of each moon and the planet.
The distance among centres of each moon and the planet must be known in order to calculate how long it will take for one of the moons to complete one full revolution around the planet. This is so because total amount of time it takes a moon to orbit a planet depends on their distance from one another.
The period of an orbiting object will be determined using the formula T = 2(a^3/GM). The durations of Moons A and B will differ because they orbit the earth at various altitudes from its centre. Therefore, in order to determine each moon's individual period, it is required to know the distance between each moon and the planet.
Read more about revolution on:
https://brainly.com/question/10287362
#SPJ1
What kind of wave interactions is caused by a change in the speed of the wave
Answer:Refraction
Explanation:
or the bending of the path of the waves, is accompanied by a change in speed and wavelength of the waves.
How do atomic and molecular interactions explano the properties of matter that we see and feel?
Answer:
The atomic and molecular interactions unveil the bulk properties of matter in our environment by ways of the fact that everything in the whole universe is made of either atoms, molecules or even ions
How matter is made up of atoms and molecules?
It has been proven practically everything in the whole universe is matter and everything which interact with matter is also matter. This explains to us the reasons why matter could be atoms, molecules or ions.
That being said, some substances (matter) is made up of atoms of elements, some made up of molecules or atoms and molecules and others ions or both. However, matter is anything which has mass and occupies space.
In conclusion, we can now conclude from the explanation above that the properties of matter are as a result of the interaction which exists between matter at the atomic and molecular level.
Consider the hydrogen atom as a one-dimensional box with a length of 106 pm. Calculate the wavelength of radiation emitted when its electron transitions from the n=4
state to the n=3 state.
lambda=___m
The wavelength of radiation emitted when the electron of a hydrogen atom transitions from the n=4 state to the n=3 state in a one-dimensional box of length 106 pm is approximately 6.52 x 10⁻⁷ meters.
The energy of a hydrogen atom in the nth energy level is given by:
En = -13.6 eV / n²
where eV is electron volt, a unit of energy.
The energy difference between the n=4 and n=3 energy levels can be calculated as follows:
ΔE = E₄ - E₃ = (-13.6 eV / 4²) - (-13.6 eV / 3²) = -0.59 eV
We can use the relationship between energy and the wavelength of emitted radiation given by the following equation:
ΔE = hc/λ
where h is Planck's constant (6.626 x 10⁻³⁴J s), c is the speed of light (2.998 x 10⁸ m/s), and λ is the wavelength of the emitted radiation.
Rearranging the equation to solve for λ, we get:
λ = hc/ΔE
Substituting the values, we get:
λ = (6.626 x 10⁻³⁴J s x 2.998 x 10⁸m/s) / (1.6 x 10⁻¹⁹J/eV x 0.59 eV)
λ = 6.52 x 10⁻⁷ m
Therefore, the wavelength of radiation emitted when the electron of a hydrogen atom transitions from the n=4 state to the n=3 state in a one-dimensional box of length 106 pm will be approximately 6.52 x 10⁻⁷ meters.
To know more about hydrogen atom
https://brainly.com/question/31957014
#SPJ1
Which two phrases describe the nature of a gravitational force?
A. Produced by interactions between magnetic objects.
B. One of the four fundamental forces of nature
C. Attraction between any two objects that have mass
D. Produced by interactions between electrically charged objects
Answer:
B
Explanation:
One of the four fundamental forces of nature and C. Attraction between any two objects that have mass.
You’re running a Positron Emission Tomography (PET) scanner. The isotope you use is fluorine-18 (F-18), which is incorporated into the fluorodeoxyglucose molecule. This molecule acts like glucose in the body. This substance is introduced intravenously to the patient and the radioactive decay from F-18 is imaged by the PET scanner. The resulting images will show where glucose is being consumed.
There are 2 x 1012 unstable F-18 nuclei injected into the patient’s body before PET scanning. The half life of F-18 decay is about 110 minutes. Approximate this as 2 hours. The patient is injected at 9 am, and takes a taxi home from the hospital at 1 pm. The patient’s partner returns home at 6 pm with their infant daughter.
In the decay, two separate reactions occur in sequence: 1) Positron emission of F-18 (relatively slow reaction) and then 2) Positron-electron annilation (very fast).
a) The F-18 undergoes positron emission (also known as β+ decay). Write the complete reaction for this. Nearby elements are oxygen (Z =8) and neon (Z = 10).
b) The positron emitted in the first reaction will quickly encounter an electron and they will annihilate each other, emitting two gamma rays that go to the detector ring. Calculate the energy released in Joules. The mass of the positron is identical to the mass of the electron.
c) How many nuclei are left undecayed when the patient leaves the hospital? What about at 6 pm?
d) What is the activity at each of these times in Curies? Should the cab driver or the patient’s partner be worried about radiation exposure? Should they be concerned about the infant’s exposure?
e) After 24 hours, practically all of the F-18 nuclei will be decayed. The majority of the energy absorbed by the body is due to the annihilation event. (The beta decay does release some energy, we’ll ignore it for this calculation.) Calculate the dose in Sieverts this patient receives if they are 50 kg. A “low dose” is a single exposure less than 100 mSv. Is this a low dose?
The acceleration of a student-bicycle system is zero, and in a PET scan with F-18, the energy released from the annihilation of a positron and an electron is [tex]1.64 x 10^-13[/tex]J, with a low dose received by the patient.
a) The complete reaction for positron emission of F-18 is:
18/9 F → 18/8 O + β+ + v
b) The mass of the positron and electron are both [tex]9.11 x 10^-31 kg[/tex]. When they annihilate, they release energy in the form of two gamma rays with energy[tex]E=mc^2[/tex]. The total energy released is the mass of the two particles times the speed of light squared, or:
[tex]E = 2 x (9.11 x 10^-31 kg) x (3 x 10^8 m/s)^2 = 1.64 x 10^-13 J[/tex]
c) The half-life of F-18 is 2 hours, which means that half of the initial nuclei will decay in 2 hours. Therefore, after 4 hours (when the patient leaves the hospital), the number of undecayed nuclei will be:
[tex]N = (1/2) x (2 x 10^12) = 1 x 10^12[/tex] nuclei
At 6 pm (9 hours after the injection), the number of undecayed nuclei will be:
[tex]N = (1/2)^(4.5) x (2 x 10^12) = 3.33 x 10^11[/tex]nuclei
d) The activity of the sample is given by:
A = λN
where λ is the decay constant, which is ln(2)/T, where T is the half-life, and N is the number of undecayed nuclei. Therefore, the activity at 4 hours (when the patient leaves the hospital) is:
[tex]A = (ln(2)/2 hours) x (2 x 10^12) = 5.55 x 10^11 decays/s = 0.555 Ci[/tex]
The activity at 6 pm (9 hours after the injection) is:
[tex]A = (ln(2)/2 hours) x (3.33 x 10^11) = 2.77 x 10^11 decays/s = 0.277 Ci[/tex]
The cab driver or the patient’s partner should not be worried about radiation exposure since the dose rate is low. The infant's exposure should also not be a concern since the PET scan only involves a small amount of radioactivity and the dose rate is low.
e) The absorbed dose is the energy deposited per unit mass of tissue. Since the patient weighs 50 kg, the absorbed dose is:
[tex]D = E/m = 1.64 x 10^-13 J / 50 kg = 3.28 x 10^-15 Gy[/tex]
The equivalent dose is the absorbed dose multiplied by a quality factor, which is 1 for gamma radiation. Therefore, the equivalent dose is also [tex]3.28 x 10^-15[/tex] Sv. This is a low dose, well below the threshold for concern of 100 mSv.
Learn more about acceleration here:
https://brainly.com/question/460763
#SPJ1
HELP
Particles.q₁-75.8
μC, q2 +90.6.μC, and
93 = -84.2 μC are in a line. Particles q₁ and q2 are
separated by 0.876 m and particles q2 and q3 are
separated by 0.432 m. What is the net force on
particle q3?
Remember: Negative forces (-F) will point Left
Positive forces (+F) will point Right
-75.8 μC
91
0.876 m
+90.6 μC
+92
0.432 m
–84.2 μC
93
The net force on particle q3 is approximately -0.337 N.
To determine the net force on particle q3, we need to calculate the forces exerted on it by particles q₁ and q2.
The force between two point charges can be found using Coulomb's law, which states that the force (F) between two point charges is directly proportional to the product of their charges (q₁ and q₂) and inversely proportional to the square of the distance (r) between them.
Mathematically, Coulomb's law can be expressed as:
F = k * (q₁ * q₂) / r²
Where k is Coulomb's constant, which is equal to 9 × 10^9 N⋅m²/C².
Using this formula, we can calculate the forces between the particles:
Force between q₁ and q3:
F₁₃ = k * (q₁ * q₃) / r₁₃²
F₁₃ = 9 × 10^9 * (-75.8 × 10^-6) * (-84.2 × 10^-6) / (0.432)^2
F₁₃ ≈ 0.465 N (pointing to the left)
Force between q₂ and q3:
F₂₃ = k * (q₂ * q₃) / r₂₃²
F₂₃ = 9 × 10^9 * (90.6 × 10^-6) * (-84.2 × 10^-6) / (0.876 + 0.432)^2
F₂₃ ≈ 0.128 N (pointing to the left)
The net force on particle q3 is the vector sum of these two forces, which are pointing in opposite directions:
F_net = F₂₃ - F₁₃
F_net ≈ 0.128 N - 0.465 N
F_net ≈ -0.337 N (pointing to the left)
Therefore, the net force on particle q3 is approximately -0.337 N, which means it is being pulled to the left by the other two particles.
For more such questions on force, click on:
https://brainly.com/question/12785175
#SPJ11
3. Roger broke out in an awful rash after hiking in an area where poison oak grows. He is likely suffering
from
Answer:
Explanation:
Roger is likely suffering from an allergic reaction to the oil called urushiol found in poison oak. This oil is present in the leaves, stems, and roots of poison oak, and it can cause a skin rash called allergic contact dermatitis. The rash is characterized by redness, swelling, blisters, and itching, and it can last for several weeks. In severe cases, the rash may cause oozing or crusting of the skin. It is important to seek medical attention if the rash covers a large area of the body or if it affects the face or genitals.
01*. A 45kg woman stands on a spring scale inside an elevator. (The scale reads th with which it pushes upward on the woman). What does the scale read when the elew accelerating (a) upward at 3.65m/s², (b) downward at 3.65m/s² ? [605.25N, 276.75N]
Explanation:
There are two forces on the woman: weight force pulling down, and normal force pushing up. The scale reading is the normal force.
Use Newton's second law.
∑F = ma
N − mg = ma
Solve for N.
N = mg + ma
N = m (g + a)
(a) a = +3.65 m/s²
N = (45 kg) (9.8 m/s² + 3.65 m/s²)
N = 605.25 N
(b) a = -3.65 m/s²
N = (45 kg) (9.8 m/s² − 3.65 m/s²)
N = 276.75 N
(a)A 45kg woman stands on a spring scale inside an elevator. The scale reading when the elevator accelerates upward at 3.65m/s² is 605.25N.
(b) A 45kg woman stands on a spring scale inside an elevator, the scale reading when it accelerates downward at 3.65m/s² it is 276.75N.
When a 45kg woman stands on a spring scale inside an elevator, the scale measures the force with which it pushes upward on the woman, which is equal to her weight. The weight of an object can be calculated using the formula weight = mass × acceleration due to gravity (W = m × g), where the acceleration due to gravity is approximately 9.8m/s².
(a) When the elevator accelerates upward at 3.65m/s², the net force acting on the woman is the sum of her weight and the force due to acceleration. The scale reading will be the magnitude of this net force. Using Newton's second law (F = m × a), the net force can be calculated as F = m × (g + a). Substituting the given values, we have
F = 45kg × (9.8m/s² + 3.65m/s²) = 45kg × 13.45m/s² = 605.25N.
(b) When the elevator accelerates downward at 3.65m/s², the net force acting on the woman is her weight minus the force due to acceleration. Applying the same formula, we have
F = 45kg × (9.8m/s² - 3.65m/s²) = 45kg × 6.15m/s² = 276.75N.
For more such information on: accelerates
https://brainly.com/question/30595126
#SPJ11
What happens to the capacitance if the charge on the plates of a capacitor is doubled? a. The capacitance is doubled. c. The capacitance remains unchanged. b. The capacitance is halved. d. The capacitance becomes four times. Please select the best answer from the choices provided A B C D
The correct answer is C. The capacitance remains unchanged. Capacitance is a measure of the ability of a capacitor to store charge and is determined by the physical characteristics of the capacitor, such as the surface area of the plates and the distance between them. Doubling the charge on the plates does not change these physical characteristics, so the capacitance remains unchanged.
A zinc sphere has a radius of 30.0mm at a temperature of 20 degree Celsius. If the temperature of the sphere is raised to 420 degree celcius. Determine the increase in,
a.) The radius
b.) the volume of the sphere
c.) surface of the area
The increase in radius is 0.36mm,increase in volume of the sphere is 52.47 mm^3 and increase in surface of the area is 43.12 mm^2.
To solve this problem, we need to use the coefficient of thermal expansion of zinc, which is given as:
α = 30 × 10^-6 / °C
where α is the coefficient of thermal expansion of zinc.
a.) Increase in radius:
Δr = α * r * ΔT
where ΔT is the change in temperature, r is the initial radius of the sphere.
ΔT = (420 - 20) = 400°C
r = 30.0mm
Δr = (30 × 10^-6 / °C) * (30.0mm) * (400°C)
Δr = 0.36mm
Therefore, the increase in radius is 0.36mm.
b.) Increase in volume:
ΔV = (4/3) * π * [(r + Δr)^3 - r^3]
ΔV = (4/3) * π * [(30.0mm + 0.36mm)^3 - (30.0mm)^3]
ΔV = 52.47 mm^3
Therefore, the increase in volume is 52.47 mm^3.
c.) Increase in surface area:
ΔA = 4 * π * (r + Δr)^2 - 4 * π * r^2
ΔA = 4 * π * (30.0mm + 0.36mm)^2 - 4 * π * (30.0mm)^2
ΔA = 43.12 mm^2
Therefore, the increase in surface area is 43.12 mm^2.
For more such questions on surface,click on:
https://brainly.com/question/29719172
#SPJ11
Your class goes on a field trip to observe drilling machinery. The geologists at the drill site show you displays of drilled rocks to compare different types of drills and methods. The drilled holes in one rock display are significantly larger than the holes drilled in the display next to it. Given this information, which statement is correct?
We can see here that the statement that is correct will be: B. The rock display with larger holes shows petroleum drilling, which is deep underground.
Who is a geologist?A geologist is a scientist who focuses on the solid components of the Earth, such as minerals and rocks, as well as the processes that shape the planet's surface.
Geologists study the make-up, structure, and past of the Earth's crust in order to comprehend geological processes including mountain creation, earthquake and volcanic activity, and the exploitation of natural resources. They frequently perform fieldwork, gathering samples, running surveys, and researching geological formations.
Learn more about geology on https://brainly.com/question/830768
#SPJ1
The complete question is that:
Your class goes on a field trip to observe drilling machinery. The geologists at the drill site show you displays of drilled rocks to compare different types of drills and methods. The drilled holes in one rock display are significantly larger than the holes drilled in the display next to it. Given this information, which statement is correct? (1 point)
A. The rock display with smaller holes shows copper drilling, which is deep underground.
B. The rock display with larger holes shows petroleum drilling, which is deep underground.
C. The rock display with smaller holes shows petroleum drilling, which is closer to the surface.
D. The rock display with larger holes shows copper drilling, which is closer to the surface.
The number of distinct ways of placing four indistinguishable balls into five distinguishable boxes is _____
The number of distinct ways of placing four indistinguishable balls into five distinguishable boxes is 20.
To solve this problem, we can use the stars and bars method, which is a combinatorial technique used to count the number of ways to distribute indistinguishable objects into distinguishable containers. In this case, we have four indistinguishable balls and five distinguishable boxes.
The stars and bars method works by representing each ball as a star and using bars to separate the balls into different boxes. For example, if we wanted to distribute two balls into three boxes, we could use the following diagram:
* | * * | *
In this diagram, the first and last bars represent the boundaries of the containers, while the stars represent the balls.
The second bar separates the first two balls from the last ball, indicating that the first two balls are in the first container and the last ball is in the third container.
To distribute four balls into five boxes, we need to use three bars to separate the balls into four groups. We have a total of six spaces to place the bars (including the boundaries), and we need to choose three of them to place the bars.
Therefore, the number of distinct ways to place four indistinguishable balls into five distinguishable boxes is the same as the number of ways to choose three spaces out of six, which is:
6 choose 3 = (6!)/(3!3!) = 20
Therefore, there are 20 distinct ways to place four indistinguishable balls into five distinguishable boxes using the stars and bars method.
For more such questions on boxes, click on:
https://brainly.com/question/28344846
#SPJ11
describe how energy is transferred fraom the hot plate to heat up all of the potato
Answer:
Conduction is the process of heat being transferred between objects through direct contact
Explanation:
For example, in cooking the burners on stoves will conduct heat energy to the bottom of a pan sitting on top of it. From there, the pan conducts heat to its contents.
An induction stove heats a pot with a coil carrying an alternating current located beneath the pot (and without a hot surface). Can the stove surface be a conductor? Why won’t a coil carrying a direct current work?
No the stove surface be a conductor.
A coil carrying a direct current would not work for an induction stove because a direct current produces a constant magnetic field
An induction stove uses a coil carrying an alternating current to generate a magnetic field, which then induces an electric current in the pot placed on top of the stove.
The current flowing through the pot produces heat, which then cooks the food inside the pot. The stove surface itself does not conduct electricity but instead acts as a magnetic field conductor to transfer energy to the pot.
The stove surface cannot be made of a conductor because the induction stove's functioning principle relies on the induction effect produced by the alternating current.
If the stove surface were a conductor, it would short-circuit the current passing through the coil, and no magnetic field would be generated to induce the current in the pot.
This is why induction stoves typically have a glass or ceramic surface that does not conduct electricity but can efficiently conduct the magnetic field generated by the coil.
A coil carrying a direct current would not work for an induction stove because a direct current produces a constant magnetic field, whereas an alternating current produces a continuously changing magnetic field.
A constant magnetic field cannot induce a current in a pot, while a changing magnetic field induces a current in the pot, resulting in the heating effect.
Therefore, an induction stove requires an alternating current to generate the necessary changing magnetic field to heat the pot.
For more such questions on current, click on:
https://brainly.com/question/1100341
#SPJ11
4. A structural engineer must determine which type of steel to select for a beam, but the
weight limitation cannot exceed 7 tons. The project has narrowed the choices down to
A36 steel (p= 7800 kg/m³) and A992 steel (p= 7850 kg/m³). However, the engineer
needs to determine the load difference between an A36 and A992 steel box beam with an
inertia of 356 in, and has an elastic modulus of 30 x 106 PSI & 35 x 106 PSI, respectively.
The A36 steel is designed to deflect 0.107" while the A992 steel is designed to deflect
0.118". Both beams have a span length of 12.3 meters, a distributed stress of 101.45
kN/m², full length of 15.78 m, and the beam is in a simple load configuration. Determine
the load difference between the two beam options at the design limit.
What is your calculated answer most closely to?
a. 1.5 ton
b. 20.5 tons
c. 104.7 tons
d. 8924.1 tons
Answer:
Explanation:
104.7 tons
3
15. What is an application for a positive temperature
coefficient (PTC) thermistor device?
PTC thermistors are used in temperature sensing, overcurrent protection, and motor starting applications.
A positive temperature coefficient (PTC) thermistor is a sort of thermally delicate resistor whose opposition increments with an expansion in temperature. This property makes PTC thermistors helpful in various applications, including temperature detecting, overcurrent assurance, and engine turning over. One normal application for PTC thermistors is in temperature detecting, where they can be utilized to quantify the temperature of a specific climate or item. They can likewise be utilized in overcurrent security gadgets, where they are set in series with a circuit to restrict the ongoing stream when the temperature climbs. PTC thermistors can likewise be utilized as a switch in engine turning over circuits, where they give an underlying high current flood prior to changing to a lower present status.
To learn more about thermistors, refer:
https://brainly.com/question/14978293
#SPJ1
Assess how you,young person ,could use social media to promote respect for the different right in the Bill of right
As a young person, can use social media platforms to promote respect for the different rights in the Bill of Rights by sharing information, starting conversations, and advocating for change.
Here are some ways you can use social media to promote respect for the different rights in the Bill of Rights:
Share Information: Use your social media accounts to share information about the different rights in the Bill of Rights. Share graphics, infographics, and articles about each of the rights, and what they mean. You can also share stories of people whose rights have been violated or those who have fought for their rights.Start Conversations: Start conversations about the different rights in the Bill of Rights. Ask questions, share your thoughts, and encourage others to share their perspectives. Engage in respectful dialogue and learn from each other.Advocate for Change: Use your social media to advocate for change. Share information about policies or laws that may be impacting the rights of certain groups of people, and encourage your followers to take action. This can include signing petitions, contacting their representatives, or joining protests.Highlight Positive Examples: Use social media to highlight positive examples of individuals or organizations that are respecting the different rights in the Bill of Rights. Share stories of people who are fighting for justice and equality, and celebrate when positive change is made.
To know more about social media
https://brainly.com/question/31891423
#SPJ1
An electric car can accelerate from rest to 96.5 km/h (this is often called “from 0 to 60” measured in miles per hour) in 2.4 s. Find the power of the car, given its mass of 1961 kg
We can start by finding the acceleration of the car:a = Δv/Δt = (96.5 km/h)/(2.4 s) = 40.21 m/s^2
Next, we can find the force required to accelerate the car:F = ma = (1961 kg)(40.21 m/s^2) = 78914.81 N
Finally, we can find the power of the car:P = Fv = (78914.81 N)(96.5 km/h) = 2.84 x 10^6 W
Therefore, the power of the car is approximately 2.84 megawatts.
The ground state wavefunction of the hydrogen electron in spherical coordinates depends on the radius and the Bohr radius _0. Determine the expression for the radial position expectation value ⟨⟩ of the ground‑state hydrogen electron. Submit your answer in terms of the given variables and constants.
Answer:
just go to demos:) yere yerre
You see a boat sitting at the end of a dock. Ten minutes later you see the same boat in a cove to the right of the dock. You did not see the boat move.
However, you know that the boat moved because its
relative to the dock changed.
The boat must have moved, despite not being seen to move, because its relative position to the dock has changed. This phenomenon is known as relative motion .
Everything is always in motion, but the way we perceive it depends on our frame of reference.
In this scenario, the dock was the frame of reference for the initial position of the boat. When the boat moved to the cove, its position relative to the dock changed, and the dock was no longer an appropriate frame of reference. The boat's motion is now relative to the cove instead.
It is important to note that relative motion depends on the chosen frame of reference. If we were to choose the boat as the frame of reference, then it would be the dock that appears to move, not the boat. This is because motion is always relative to a chosen frame of reference.
In conclusion, the boat must have moved because its position relative to the dock changed. The concept of relative motion reminds us that motion is always relative to a chosen frame of reference, and that the way we perceive motion depends on our chosen frame of reference.
For more question on relative motion visit:
https://brainly.com/question/867069
#SPJ11
how do you find a transition metals ionic charge
The ionic charge of a transition metal can be determined by its position in the periodic table and the number of valence electrons it has. Most transition metals can have multiple ionic charges due to the different number of valence electrons that they can lose or gain.
The most common way to determine the ionic charge of a transition metal is to refer to its position in the periodic table and the number of electrons in its outermost shell. Transition metals typically lose electrons to form positive ions, so the ionic charge is determined by the number of electrons that are lost.
For example, the transition metal iron (Fe) is located in Group 8 of the periodic table and has two valence electrons. Iron can lose either one or two electrons to form the Fe+ or Fe2+ ions, respectively. Similarly, copper (Cu) is located in Group 11 and has one valence electron. Copper can lose this electron to form the Cu+ ion or lose two electrons to form the Cu2+ ion.
In some cases, the ionic charge of a transition metal can also be determined by the charge of the non-metal ion it is combined with in a compound. For example, in the compound FeCl3, the chlorine ion has a charge of -1, and there are three chloride ions in the compound. Therefore, the iron ion (Fe3+) must have a charge of +3 to balance the overall charge of the compound.
Which material would a magnet attract?
O A. Wood
O B. Cement
O C. Glass
OD. Iron
The material that the magnet attracts is Iron and hence the ideal solution is option D.
The magnet is the material that produces the magnetic field on its own. The magnetic field is the invisible field but it has the ability to attract other materials. Magnets are made up of ferromagnetic materials.
Ferromagnetic materials are materials that are permanently magnetized due to the unpaired electrons in the materials. Most of the Ferromagnetic materials are metals namely nickel, iron, etc.
When the magnet is brought close to the iron, the electrons in the iron are aligned in the direction of the magnetic field which makes the iron become magnetized. Thus, the attraction takes place between two magnetized objects.
Thus, the ideal solution is option D) Iron.
To learn more about Ferromagnetic materials:
https://brainly.com/question/13399259
#SPJ1