22. A 15-volt battery is connected to a 3.0-ohm resistor, as shown.How much power is used by the resistor?(a) 8.3 W(b) 15 W(c) 45 W(d) 75 W

1.) The relative humidity is 100 percent. 2.)To saturate the air at 20°C, 0.018g of water should evaporate.

(i) To calculate the relative humidity at room temperature, compare the amount of water vapour in the air to the maximum amount of water vapour that the air can hold at that temperature.

The saturated vapour pressure at that temperature determines the maximum amount. The relative humidity is stated as a percentage and can be calculated using the formula:

(Actual vapour pressure / Saturated vapour pressure) times 100% = Relative humidity

The saturation vapour pressure at room temperature (20°C) is 17.54mmHg. The relative humidity is 100% if the actual vapour pressure in the air equals the saturation vapour pressure.This signifies that the air has held the most water vapour it can at that temperature.

(ii) Using the ideal gas law, we can calculate the amount of water that should evaporate to saturate the air at 20°C. PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin, according to the ideal gas equation.

This equation can be rearranged to calculate the amount of moles of water:

n = (PV) / (RT)

We know that the required pressure is 17.54mmHg, which is equal to 2.338 kPa. We also know that the temperature is 20° C, which is 293.15 K.The volume is not specified, but we can assume it is constant and hence ignore it. The gas constant is 8.31 joules per mol-K.

n = ((2.338 kPa) / (8.31 J/mol-K * 293.15K))

To calculate the mass of water, multiply the number of moles by the molar mass of water, which is about 18.015 g/mol.

0.01796 g = 0.000997 mol * 18.015 g/mol mass of water

To saturate the air at 20°C, around 0.018g of water should evaporate.

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Answer:

The characteristics that determine how easily two substances change temperature are:

The volume and density of the substances and the amount of time they are in contact do not directly affect how easily they change temperature.

Explanation:

An express magnitude is a positive number and angle between. ±180∘.  v1 = ∠ ∘ V.

Nodal stress analysis complements the previous mesh analysis in that it is equally powerful and based on the same concepts as matrix analysis. As the name suggests, node voltage analysis uses Kirchhoff's first law node equation to find the voltage potential around a circuit.

When we use the term node voltage, we are referring to the potential difference between two nodes in a circuit. Select one of the nodes in your circuit as the reference node. All other node voltages are measured with respect to this one reference node.

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Explanation:

Finding the (maximum) respective prime powers would yield the answer. Also we need not ... Is perfectly divisible by 720^n? ... So we can say that for any positive value of n it not divisible.

Answer:

the particle is at coordinates (18,15/2)

Explanation:

To find the acceleration of the particle, we can use the formula for velocity: v = v0 + at, where v0 is the initial velocity, a is the acceleration, and t is the time. Since we know the initial and final velocities, as well as the time interval, we can solve for the acceleration:

a = (v - v0)/t = [(9i + 7j) - (3i - 2j)]/3 = (6i + 9j)/3 = 2i + 3j

So the acceleration of the particle is a = 2i + 3j m/s².

To find the coordinates of the particle at t=3s, we can use the formula for position: r = r0 + v0t + 1/2at², where r0 is the initial position. Since the particle starts at the origin, r0 = 0. Plugging in the values we have:

r = 0 + (3i - 2j)(3) + 1/2(2i + 3j)(3)² = 9i - 6j + 9i + 27/2 j = 18i + 15/2 j

We can use the kinematic equations of motion to solve this problem.

Let the acceleration of the particle be a = axî + ayj.

(a) Using the equation of motion v = u + at, where u is the initial velocity:

f = v = u + at

Substituting the given values, we get:

(91+7j) = (3î-2j) + a(3î + 3j)

Equating the real and imaginary parts, we get:

91 = 3a + 3a (coefficients of î are equated)

7 = -2a + 3a (coefficients of j are equated)

Solving these equations simultaneously, we get:

a = î(23/6) + j(1/2)

So the acceleration of the particle is a = (23/6)î + (1/2)j.

(b) Using the equation of motion s = ut + (1/2)at^2, where s is the displacement and u is the initial velocity:

At t = 3s, the displacement of the particle is:

s = ut + (1/2)at^2

Substituting the given values, we get:

s = (3î-2j)(3) + (1/2)(23/6)î(3)^2 + (1/2)(1/2)j(3)^2

Simplifying, we get:

s = 9î + (17/2)j

So the coordinates of the particle at t=3s are (9, 17/2).

Answer:

I think hes cool

Explanation:

Answer:

Q1. A measurable extent of a particular kind, such as length, breadth, depth, or height.

Q2. A dimensional constant is a physical quantity that has dimensions and has a fixed value. Some of the examples of the dimensional constant are Planck's constant, gravitational constant, and so on.

Q3. Physical quantities which posses dimensions and have variable are called dimensional variables. Examples are length, velocity, and acceleration etc.

Q4. Dimensionless variables are the quantities which doesn't have any dimensions the the value is a variable. Eg: angle = arc/ radius. Dimensions = L/L. = 1. So angle does not have any dimensions and the value can vary.

Q5. Principle of Homogeneity states that dimensions of each of the terms of a dimensional equation on both sides should be the same. This principle is helpful because it helps us convert the units from one form to another.

Q6. Dimensional analysis has been around a long time, Newton called it the "Great principle of Similitude", but the modern form can be traced back to James Clerk Maxwell. It was Maxwell who distinguished mass [A/], length [£], and time [7"] as the independent dimensions from which others could be derived.

Q7. Mass, length, time, temperature, electric current, amount of light, and amount of matter.

Q8. Dimensional analysis is used to convert the value of a physical quantity from one system of units to another system of units. Dimensional analysis is used to represent the nature of physical quantity. The expressions of dimensions can be manipulated as algebraic quantities.

Hope that helps. x

Yes it can, an object can be moving a certain direction while the ACCELERATION is in the opposite direction.

Lets say your riding a bike... if your squeezing your handle bar breaks, the acceleration of the bike would be pushing in the opposite direction of the direction the bike is moving.

Hope this helped!

Answer:

We can use the formula for the period of a pendulum:

T = (2 * pi * sqrt(L/g))

where:

T = period (in seconds)

pi = 3.14159...

L = length of the pendulum (in meters)

g = acceleration due to gravity (9.81 m/s^2)

We can solve for L by rearranging the formula:

L = (T^2 * g) / (4 * pi^2)

We are given that the pendulum swings 20 times in 25 seconds. The period of one swing is the time it takes to complete one full cycle, so the period of 20 swings is 25 seconds divided by 20 swings, or 1.25 seconds.

Using this value for T and plugging in g, we get:

L = (1.25^2 * 9.81) / (4 * 3.14159^2)

L ≈ 0.153 meters or 15.3 centimeters

Therefore, the length of the pendulum is approximately 15.3 centimeters.

ANSWER

EXPLANATION

Longitudinal waves are waves that vibrate a medium parallel to the direction of the wave motion. They transfer energy but do not transfer matter as they move.

Examples of longitudinal waves are sound waves and ultrasound waves

Transverse waves are waves in which the disturbance moves perpendicular to the direction of the wave. They transfer both energy and matter.

Examples of transverse waves are surface ripples on water and electromagnetic waves.

Hence, the correct options are:

=> Both Transverse and Longitudinal

=> Transverse

=> Longitudinal

=> Longitudinal

=> Transverse

=> Longitudinal

=> Transverse.

=> Both Transverse and Longitudinal

Answer: Birds migrate to move from areas of low or decreasing resources to areas of high or increasing resources. The two primary resources being sought are food and nesting locations. Here’s more about how migration evolved.

Birds that nest in the Northern Hemisphere tend to migrate northward in the spring to take advantage of burgeoning insect populations, budding plants and an abundance of nesting locations. As winter approaches and the availability of insects and other food drops, the birds move south again. Escaping the cold is a motivating factor but many species, including hummingbirds, can withstand freezing temperatures as long as an adequate supply of food is available.

Explanation: sorry about the anther

The displacement of the person travelling at 23 m / s for a period of 16 seconds is 368 m

v = d / t

v = Velocity

d = Displacement

t = Time

v = 23 m / s

t = 16 s

d = 23 * 16

d = 368 m

Yes, there are multiple online calculators to find various physical quantities such as Acceleration, force, friction etc. For example omni calculator is one such online calculator.

Therefore, the displacement of the person is 368 m

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Answer:

8 m/s to the left.

Explanation:

Applying,

V = d/t...................... Equation 1

Where V = Velocity of the car, d = distance, t = time

From the question,

Given: d = 24 meters, t = 3 seconds

Substitute these values into equation 1

V = 24/3

V = 8 m/s to the left.

Hence the velocity of the car is 8 m/s to the left.

Answer:  1. The function of a lightning rod is to protect buildings, structures, and people from lightning strikes by providing a path of least resistance for the electrical current to follow, directing it safely into the ground instead of through the structure or people.

2. Charge build-up is reduced on airplanes through various methods, such as using conductive materials in the airplane's structure, applying anti-static coatings on the airplane's surface, and installing static discharge wicks or similar devices on the airplane's trailing edges, which provide a way for any accumulated charge to safely dissipate into the air.

3. A ground strap is a necessary safety feature when transferring fuel because it provides an electrical connection between the fuel container and the receiving container, allowing any static charge to safely dissipate into the ground. Without a ground strap, the static charge could build up and potentially ignite the fuel.

4. Three different methods for reducing charge build-up in clothes dryers are: (1) using dryer sheets or fabric softeners, which can help neutralize static charges on the clothes, (2) adding a damp cloth to the dryer, which can help dissipate static charges, and (3) using metal dryer balls, which can physically separate clothes and prevent them from rubbing against each other and creating static charges.

5. Four different methods for reducing charge build-up in a computer room with a carpet are: (1) using conductive flooring or carpet tiles that can help dissipate static charges, (2) using anti-static mats or wrist straps for personnel who work in the room, (3) using air ionizers or humidifiers, which can help neutralize static charges in the air, and (4) grounding all equipment and devices in the room to prevent the buildup of static charges.

Explanation:

I hope this helps!

Answer:

D.

Explanation:

the required angle is ∠PRS (for more info see the attachment), then it is D.

Answer: D

Explanation:

Answer:

144.6ohms

Explanation:

v=IR

R =V/I=120/0.83

R=144.6

Test tube holder

When a test tube is hot or need to be properly held to avoid the spillage of its contents, a test tube holder is the laboratory equipment that is used to grip or hold the test tube.

Therefore, the test tube holder is used for holding or gripping a test tube after it has been heated or cooled

A 66.1-kg boy is surfing and catches a wave which gives him an initial speed of 1.60 m/s. He then drops through a height of 1.59 m, and ends with a speed of 8.51 m/s. The nonconservative work done on the boy is approximately -42.7 kilojoules.

To find the nonconservative work done on the boy, we need to consider the change in the boy's mechanical energy during the process. Mechanical energy is the sum of the boy's kinetic energy (KE) and gravitational potential energy (PE).

The initial mechanical energy of the boy is given by the sum of his kinetic energy and potential energy when he catches the wave:

E_initial = KE_initial + PE_initial

The final mechanical energy of the boy is given by the sum of his kinetic energy and potential energy after he drops through the height:

E_final = KE_final + PE_final

The nonconservative work done on the boy is equal to the change in mechanical energy:

Work_nonconservative = E_final - E_initial

Let's calculate each term:

KE_initial = (1/2) * m * v_initial^2

= (1/2) * 66.1 kg * (1.60 m/s)^2

PE_initial = m * g * h_initial

= 66.1 kg * 9.8 m/s^2 * 1.59 m

KE_final = (1/2) * m * v_final^2

= (1/2) * 66.1 kg * (8.51 m/s)^2

PE_final = m * g * h_final

= 66.1 kg * 9.8 m/s^2 * 0

Since the boy ends at ground level, the final potential energy is zero.

Substituting the values into the equation for nonconservative work:

Work_nonconservative = (KE_final + PE_final) - (KE_initial + PE_initial)

Simplifying:

Work_nonconservative = KE_final - KE_initial - PE_initial

Calculating the values:

KE_initial = (1/2) * 66.1 kg * (1.60 m/s)^2

PE_initial = 66.1 kg * 9.8 m/s^2 * 1.59 m

KE_final = (1/2) * 66.1 kg * (8.51 m/s)^2

Substituting the values:

Work_nonconservative = [(1/2) * 66.1 kg * (8.51 m/s)^2] - [(1/2) * 66.1 kg * (1.60 m/s)^2 - 66.1 kg * 9.8 m/s^2 * 1.59 m]

Calculating the result:

Work_nonconservative ≈ -42.7 kJ

Therefore, the nonconservative work done on the boy is approximately -42.7 kilojoules. The negative sign indicates that work is done on the boy, meaning that energy is transferred away from the boy during the process.

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Heat transfer by radiation and convection causes the surface water of the pool to be warm which decreases with depth.

There are two heat transfer process responsible for variation in temperature of water at different depth of a pool, they include;

The surface of the water absorbs heat from the air and the sun. The heat from the sun is transferred to the pool through radiation.

The heat from the air is transferred to the pool through convection.

Thus, these two heat transfer processes  causes the surface water of the pool to be warm which decreases with depth.

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Answer:

iam not sure but I think its NaNO3

A VfL (Vertical Field LED) backlighting system is commonly used in LCD (Liquid Crystal Display) televisions.

LCD TVs rely on a backlight to illuminate the liquid crystal layer, which controls the passage of light to create the visual image. The VfL technology is a specific type of LED backlighting arrangement used in certain LCD TV models. In a VfL backlighting system, the LEDs (Light-Emitting Diodes) are positioned vertically along the edges of the LCD panel.

The light emitted by these LEDs is directed across the panel using light guides or optical films, illuminating the liquid crystal layer uniformly. One advantage of VfL backlighting is its ability to provide consistent illumination across the LCD panel, reducing any potential inconsistencies in brightness or color uniformity. The vertical orientation of the LEDs allows for more precise control over light distribution, improving overall image quality.

Additionally, VfL backlighting offers potential advantages in terms of power efficiency. By selectively dimming or turning off specific zones of LEDs, local dimming techniques can be employed to enhance contrast and black levels, resulting in improved picture quality while conserving energy. It's important to note that VfL backlighting is just one of several backlighting technologies available for LCD TVs.

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Answer:

Kinematics is the study of motion of a system of bodies without directly considering the forces or potential fields affecting the motion. In other words, kinematics examines how the momentum and energy are shared among interacting bodies.

Answer:

Por lo tanto, la presión del ozono es:

\(P=0.011\: atm\)  

Explanation:

Podemos usar la ecuacion de los gases ideales;

\(PV=nRT\) (1)

Tenemos:

El volumen V = 224 dm³ = 224 L

La temperatura T = 51.09 C = 324.09 K

La masa es m = 4.561 kg

Lo necesitamos ahora es calvular n que es el numero de moles;

recordemos que el peso molecular del ozono M = 48 g/mol.

\(n=\frac{m}{M}=\frac{4.561}{48}=0.095\: mol\)

Finalmente, usando la ecuacion 1 despejamos la presion P

\(P=\frac{nRT}{V}\)

\(P=\frac{0.095*0.082*324.09}{224}\)  

Por lo tanto, la presion del ozono es:

\(P=0.011\: atm\)  

Espero te haya ayudado!

The density (ρ) of the chunk of metal is, approximately, 7,213.74 kg/m³.

First of all, let's define the word density in physics.

Density is a value that represents how much mass of a given substance can be contained in a determined volume. This value changes for each element or mix of elements from the periodic table and can be used to identify some of them.

The formula for density is the following;

\(D=\frac{m}{V}\); where "m" is the given mass of the substance, and "V" is the volume that the given mass occupies in space.

Side note. Density is typically represented by the greek letter ρ (rho). The most common used units for density are:

• Kilograms/cubic meters (kg/m³);
• Grams/cubic centimeters (g/cm³);
• Pounds/cubic feet (lb/ft³).

So we already know that density only requires 2 values to be calculated, mass and volume, and the problem already provides that information, therefore:

\(m=945(kg)\\ \\V=0.131(m^{3} )\)

\(D=\frac{m}{V} =\frac{945(kg)}{0.131(m^{3} )} =7213.7405(\frac{kg}{m^{3} } )\)

The density (ρ) of the chunk of metal is, approximately, 7,213.74 kg/m³.

This means that 1 cubic meter of this substance has a mass of 7,213.74 kg.

This is an exercise in density, a physical property of matter that is defined as mass per unit volume. It is an important property to identify and characterize different materials, since it varies depending on the type of substance and the conditions in which it is found.

Density is expressed mathematically as mass divided by volume, which gives us a measure of the amount of matter present in a given space. This property is very useful for identifying and classifying different types of substances, from solids to liquids and gases.

In general, solids have a higher density than liquids and gases, due to the way the particles are arranged and the force with which they interact with each other. For example, iron has a greater density than water, which means that an equal amount of iron will have a greater mass than the same amount of water.

Density is important in everyday life, as it is used to measure the concentration of substances in solutions or mixtures. For example, the density of pure water is 1 gram per cubic centimeter (1 g/cm³), while the density of ethyl alcohol is 0.789 g/cm³. If we mix a quantity of water with a quantity of alcohol, the density of the resulting mixture will be a combination of both densities, which will allow us to determine the concentration of alcohol in the mixture.

Density is an important property in geology, where it is used to identify and classify different types of rocks and minerals. For example, sedimentary rocks often have a lower density than igneous or metamorphic rocks, due to the way they formed and the materials they are made of.

In engineering, density is important for the design of structures and materials that must support loads and efforts. For example, the materials used in the construction of bridges or buildings must have an adequate density to support the weight of the structure and the forces to which it will be subjected.

Density is also important in physics and chemistry, where it is used to calculate the mass and volume of substances, as well as to determine the concentration of solutions and mixtures. In physics, density is an important property for understanding fluid behavior, acoustics, and thermodynamics.

It tells us that the metal has a volume of 0.131 m³ and has a mass of 945 kg, and we are asked to calculate its density.

D = m/v

Where

Mass is measured in kilograms (kg).

The volume in cubic meters (m^3).

Density is measured in kg/m^3.

D = m/v

D = (945 kg)/(0.131 m³)

D ≈ 7213.74 kg/m³

Therefore, the density of the piece of metal is approximately 7213.74 kg/m³.

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Answer:

They travel fastest when the particles are able to collide more. Because there is no medium in a vacuum, it will travel the fastest. ... Solids, because of how close the particles are.

Explanation:

They travel fastest when the particles are able to collide more. Because there is no medium in a vacuum, it will travel the fastest. ... Solids, because of how close the particles are.

Answer:2.7 joules

Explanation:

Rolling Cylinder Kinetic Energy.

A cylindrical solid object of mass 400g and radius of 20cm is rolling down as inclined plane at speed of 3m/s. calculate the kinetic energy of the given object.​

To calculate the kinetic energy of a rolling cylinder, we need to use the formula for rotational kinetic energy, which is:

K_rotational = (1/2) * I * ω^2

where I is the moment of inertia and ω is the angular velocity.

For a cylinder rolling without slipping down an inclined plane, the total kinetic energy is the sum of translational kinetic energy and rotational kinetic energy, which is:

K_total = K_translational + K_rotational

where K_translational is given by:

K_translational = (1/2) * m * v^2

where m is the mass of the cylinder, and v is its linear velocity.

First, let's find the moment of inertia of the cylinder. For a solid cylinder, the moment of inertia is given by:

I = (1/2) * m * r^2

where r is the radius of the cylinder. Substituting the given values, we get:

I = (1/2) * 0.4 kg * (0.2 m)^2 = 0.008 kg·m^2

Next, let's find the linear velocity of the cylinder. The speed of the cylinder is given as 3 m/s, so the linear velocity is:

v = 3 m/s

Now we can calculate the translational kinetic energy:

K_translational = (1/2) * m * v^2 = (1/2) * 0.4 kg * (3 m/s)^2 = 0.9 J

Finally, we can calculate the rotational kinetic energy:

K_rotational = (1/2) * I * ω^2

Since the cylinder is rolling without slipping, the linear velocity is related to the angular velocity as:

v = ω * r

Rearranging this equation, we get:

ω = v / r = 3 m/s / 0.2 m = 15 rad/s

Substituting the values, we get:

K_rotational = (1/2) * 0.008 kg·m^2 * (15 rad/s)^2 = 1.8 J

Therefore, the total kinetic energy of the cylinder is:

K_total = K_translational + K_rotational = 0.9 J + 1.8 J = 2.7 J

Therefore, the kinetic energy of the given object is 2.7 Joules.

The image created when an object is placed in front of a plane mirror is virtual, hence it cannot be projected onto a screen. The right response is: virtual, upright, and of the same size as the object.

A virtual picture is created when an object is placed in front of a plane mirror. The distance between the image and the mirror is equal to the distance between the item and the mirror, and the size of the image is the same as the size of the object.

The left side of an object appears to be the right side of its image when it is placed in front of a plane mirror, and the opposite is true for the right side of the object. Lateral inversion is the term for this phenomena.

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The change in internal energy, ΔE(AB) is 7.14 kJ.

Since, the ideal gas goes through a cycle of processes, the total change in internal energy will be zero.

ΔE = ΔE(AB) + ΔE(BC) + ΔE(CD) + ΔE(DA) = 0

So,

ΔE(AB) = -ΔE(BC) - ΔE(CD) - ΔE(DA)

​

We know that the process CD s an isothermal process.

So, the change in internal energy, ΔE(CD) = 0

According to the first law of thermodynamics,

ΔE = Q + W

Therefore, the change in internal energy,

ΔE(AB) = -[Q(BC) + W(BC)] - [Q(DA) + W(DA)]

ΔE(AB) = -[Q(BC) + P(B)ΔV(BC)] - [Q(DA) - P(D)ΔV(DA)]

ΔE(AB) = -(100 + 0.31 x3) - (-150 - 1 x -1)

ΔE(AB) = -100 - 0.93 + 150 + 1

ΔE(AB) = 50 + (0.07 x 1.013 x 10⁵)

ΔE(AB) = 50 + 7091

ΔE(AB) = 7.14 kJ

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Answer:

Compression, Condensation, Expansion, Evaporation