A solenoid with ends marked a and b is suspended by a thread so that the core rotate in the horizontal plane, a current is maintained in the coil so that the electrons move clockwise when viewed from end a toward end b. how will the coil align itself in earth’s magnetic field?

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.

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

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

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

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.

The purpose of the lab is to learn how to classify minerals and rocks based on their physical and chemical properties.

Here is an example of a detailed report:

The lab aims to teach students the techniques and criteria used to identify minerals and rocks, such as their hardness, color, luster, cleavage, and crystal structure. By studying the physical and chemical properties of minerals and rocks, students can classify them into different groups and gain a better understanding of their composition and origin.

Summarize the procedure.

In the lab, students first learned how to identify minerals based on their physical properties, such as hardness, streak, color, luster, and cleavage. They then moved on to identifying rocks based on their mineral composition and texture. The lab also included the use of specialized tools, such as a hand lens, streak plate, and hardness scale, to aid in mineral identification. Students were required to observe and record their findings, and to use their observations to classify the minerals and rocks they encountered.

Section II: Observations and Conclusions

The lab included the use of various charts and tables to aid in mineral and rock identification, such as the Mohs hardness scale and the rock identification chart. Students also observed different types of minerals and rocks, such as quartz, feldspar, granite, and basalt, and learned how to distinguish between them based on their physical and chemical properties.

In conclusion, the lab provided a hands-on approach to learning about mineral and rock classification. By using the techniques and criteria discussed in class, students were able to identify and classify different minerals and rocks. The lab also provided an opportunity for students to practice their observation and record-keeping skills. To improve the investigation, it would be helpful to include more samples of minerals and rocks, and to provide additional information on their geological origins.

Find out more on Mineral and Rock here: https://brainly.com/question/28033913

#SPJ1

The evidence that  lead to the development of the principle of mass energy equivalence are radioactivity, atomic spectra and photoelectric effect.

The Einstein energy equation or the mass defect and binding energy are related by Albert Einstein's formula is given as;

E = mc²

where;

The evidence that  lead to the development of the principle of mass energy equivalence are listed below:

Learn more about mass defect here: https://brainly.com/question/30914903

#SPJ1

To solve this problem, we can apply the principles of conservation of momentum and conservation of kinetic energy.

Given:

Mass of car 1 (m1) = 2000 kg

Initial velocity of car 1 (v1_initial) = 15.0 m/s to the right

Mass of car 2 (m2) = 1500 kg

Mass of car 3 (m3) = 2500 kg

Since the collision between car 1 and car 2 is described as elastic, we can use the conservation of momentum to find the final velocities of car 1 and car 2. The conservation of momentum states that the total momentum before the collision is equal to the total momentum after the collision.

Before the collision:

Initial momentum = m1 * v1_initial + m2 * 0 (since car 2 is initially at rest)

After the collision:

Final momentum = m1 * v1_final + m2 * v2_final

Using the conservation of momentum, we can equate the initial momentum to the final momentum:

m1 * v1_initial + m2 * 0 = m1 * v1_final + m2 * v2_final

Simplifying the equation:

m1 * v1_initial = m1 * v1_final + m2 * v2_final

Since car 2 and car 3 have a completely inelastic collision, they stick together and move as one unit. We can use the conservation of momentum again to find the final velocity of the car 2/3 combo.

Before the collision:

Initial momentum = m2 * v2_final + m3 * 0 (since car 3 is initially at rest)

After the collision:

Final momentum = (m2 + m3) * v_final_combo

Using the conservation of momentum:

m2 * v2_final + m3 * 0 = (m2 + m3) * v_final_combo

Simplifying the equation:

m2 * v2_final = (m2 + m3) * v_final_combo

Now we have a system of two equations with two unknowns (v1_final and v2_final), which we can solve simultaneously.

First, let's solve the first equation for v1_final:

m1 * v1_initial = m1 * v1_final + m2 * v2_final

v1_final = (m1 * v1_initial - m2 * v2_final) / m1

Next, let's solve the second equation for v2_final:

m2 * v2_final = (m2 + m3) * v_final_combo

v2_final = (m2 + m3) * v_final_combo / m2

Now we substitute the expression for v2_final into the expression for v1_final:

v1_final = (m1 * v1_initial - m2 * [(m2 + m3) * v_final_combo / m2]) / m1

v1_final = (m1 * v1_initial - (m2 + m3) * v_final_combo) / m1

Now we substitute the values:

v1_final = (2000 kg * 15.0 m/s - (1500 kg + 2500 kg) * v_final_combo) / 2000 kg

Simplifying the equation:

v1_final = (30000 kg·m/s - 4000 kg * v_final_combo) / 2000 kg

v1_final = (30.0 m/s - 2.0 * v_final_combo)

Now, let's substitute the expression for v2_final into the expression for v_final_combo:

v2_final = (m2 + m3) * v_final_combo / m2

v2_final = (1500 kg + 2500 kg) * v_final_combo / 1500 kg

v2_final = 4000 kg * v_final_combo / 1500 kg

v2_final = 2.67 * v_final_combo

Now we can substitute this expression into the equation for v1_final:

v1_final = (30.0 m/s - 2.0 * (2.67 * v_final_combo))

v1_final = 30.0 m/s - 5.34 * v_final_combo

Now we can solve for v_final_combo by equating the expressions for v1_final and v2_final:

30.0 m/s - 5.34 * v_final_combo = 2.67 * v_final_combo

Combine like terms:

30.0 m/s = 8.01 * v_final_combo

Solving for v_final_combo:

v_final_combo = 30.0 m/s / 8.01

Calculating the value:

v_final_combo ≈ 3.746 m/s

Now we can substitute this value back into the equation for v1_final to find v1_final:

v1_final = 30.0 m/s - 5.34 * v_final_combo

Substituting the value:

v1_final ≈ 30.0 m/s - 5.34 * 3.746 m/s

Calculating the value:

v1_final ≈ 8.99 m/s

Therefore, immediately after the collision, the speeds of the cars are approximately:

Car 1 (v1_final) = 8.99 m/s to the right

Car 2 (v2_final) = 2.67 * v_final_combo ≈ 2.67 * 3.746 m/s ≈ 10.01 m/s to the right

Car 2/3 combo (v_final_combo) = 3.746 m/s to the right

Sorry if my explanation is too long, i hope your understand! :)

The melody in 12-bar blues often includes the feature "call and response," which is also found in some work songs.

Call and response is a musical pattern where a lead vocalist or instrumentalist (the "call") performs a musical phrase, and another vocalist or group of musicians (the "response") answers with their own phrase. This interaction creates a dynamic conversation within the music, engaging both the performers and the audience. The 12-bar blues is a popular chord progression in blues music, consisting of three chords over a repeating 12-bar structure.

This form is prevalent in African American musical traditions, including work songs, spirituals, and blues. Call and response, as a key feature of these genres, can be observed in the vocal and instrumental exchanges in 12-bar blues compositions. While bebop and ragtime are also significant musical styles, they are not directly associated with the melodic feature in question.

Bebop is a fast-paced and complex form of jazz, characterized by intricate melodies and improvisation. Ragtime, on the other hand, is an early 20th-century piano-based music style that emphasizes syncopation and a lively rhythm. In summary, the 12-bar blues often features call and response, a musical pattern that promotes interaction and engagement and is also present in work songs. This characteristic helps create a dynamic and captivating musical experience for both performers and listeners.

know more about chords here:

https://brainly.com/question/17023621

#SPJ11

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.

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

Answer:

t= (v-u)/a

Explanation:

using the formula

a = (v-u)/t

cross multiplying

at = v-u

dividing both sides by a

t = (v-u)/a

The magnitude of the force the pin exerts on the beam is approximately A, 0.6 kN.

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

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

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.

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 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

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

Answer:

B

Explanation:

One of the four fundamental forces of nature and C. Attraction between any two objects that have mass.

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

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

Answer:Refraction

Explanation:

or the bending of the path of the waves, is accompanied by a change in speed and wavelength of the waves.

The fact that each component is connected between the same set of electrically common locations characterizes a parallel circuit.

The battery and each resistor are connected between these two groups of points. This indicates that all components in a parallel circuit have the same voltage (V) drop.

All of the components in a parallel circuit are linked across one another to create precisely two sets of electrically coupled points.

A "branch" is a channel for electric current created by one of the load components, like a resistor, in a parallel circuit. More than two circuit components can be connected in two basic ways: series and parallel. In order to build more sophisticated series-parallel circuits, these two fundamental connection techniques can be combined.

Thus, The fact that each component is connected between the same set of electrically common locations characterizes a parallel circuit.

Learn more about Parallel circuit, refer to the link:

https://brainly.com/question/32539613

#SPJ1

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

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

Answer:

just go to demos:) yere yerre

Answer:

Explanation:

104.7 tons

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:

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

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

The current density (I) is approximately 1.059 x 10^-3 A/m^2, and the potential difference (V) is approximately 943.4 V when the power dissipated is 1 W in the given cylindrical resistor.

To calculate the current density (I) and potential difference (V) in the cylindrical resistor, we can use Ohm's law and the formula for power dissipation.

The resistance (R) of the cylindrical resistor can be calculated using the formula:

R = (ρ * L) / (π * r^2),

where ρ is the resistivity of the material, L is the length of the resistor, and r is the radius.

Given that the radius (r) is 5 mm (or 0.005 m) and the length (L) is 2 cm (or 0.02 m), and the resistivity (ρ) is 3.5 x 10^3 Ω·m, we can substitute these values into the formula to find the resistance (R).

R = (3.5 x 10^3 * 0.02) / (π * 0.005^2)

≈ 8.912 x 10^5 Ω.

The power dissipated in the resistor (P) can be calculated using the formula:

P = (V^2) / R,

where V is the potential difference across the resistor.

Given that the power dissipated is low, let's assume a power of 1 W. Substituting this value and the resistance (R) into the power formula, we can solve for the potential difference (V).

1 = (V^2) / (8.912 x 10^5)

V^2 ≈ 8.912 x 10^5

V ≈ √(8.912 x 10^5)

V ≈ 943.4 V.

To calculate the current density (I), we can rearrange Ohm's law as follows:

I = V / R.

Substituting the values of V and R into the equation, we get:

I = 943.4 / 8.912 x 10^5

I ≈ 1.059 x 10^-3 A/m^2.

Therefore, the current density (I) is approximately 1.059 x 10^-3 A/m^2, and the potential difference (V) is approximately 943.4 V when the power dissipated is 1 W in the given cylindrical resistor.

For more such questions on current density

https://brainly.com/question/22279870

#SPJ11

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