Explain why the man in the balck suit cannot be seen at all,once he hides his fac and hands in the black fabric.

Explanation:

what exactly are you asking for?

COP (Coefficient of performance) for the ideal heat pump air conditioner can be calculated by the formula: `COP= 1/(Th/Tl - 1)`, where Th is the temperature of the hot reservoir and Tl is the temperature of the cold reservoir.

In this case, the hot reservoir is the outdoor air with a temperature of 40.0°C and the cold reservoir is the indoor air with a temperature of 20.0°C. So, Th = 40.0°C and Tl = 20.0°CCOP = 1/(40/20 - 1) = 1/1 = 1

The COP for the air conditioner would be 1, assuming that the ideal (Carnot) heat pump could be constructed for use as an air conditioner

An ideal heat pump air conditioner's COP (Coefficient of Performance) would be 1, according to the calculation. If such an air conditioner is designed using the Carnot process, the outdoor air with a temperature of 40.0°C will serve as the hot reservoir, while the indoor air with a temperature of 20.0°C will serve as the cold reservoir. COP is a measure of how efficient a heat pump or air conditioner is at transferring heat.

A higher COP indicates that less energy is required to move the same amount of heat, resulting in a more efficient system.

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The wavelengths of radio and television signals are longer than those detectable by the human eye.

Radio waves and television signals are part of the electromagnetic spectrum, which also includes visible light, X-rays, and microwaves. The human eye can only detect a very small portion of this spectrum, which is referred to as the visible spectrum.

The wavelengths of visible light range from about 400 to 700 nanometers (nm), which is a very small portion of the electromagnetic spectrum. In contrast, the wavelengths of radio waves and television signals range from several millimeters to several meters, which are much longer than the wavelengths of visible light.

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La adicion de vectores permite encontrar la repuesta para la velocidad resultante del avión es:

Las magnitudes vectoriales son cantidades tienen modulo y dirección, la velocidad es una de estas magnitudes, por lo tanto deben ser sumada usando álgebra vectorial.

Un sistema de referencia es un sistema desde donde realizar las mediciones, en este caso indican que usemos un sistema de los puntos cardinales.

En el adjunto podemos ver un esquema de los vectores velocidad y su resultante, realicemos el calculo de la resultante por método analíticos

Indican que el valor de la velocidad hacia el Este es vₓ = 20 m/s y la velocidad hacia el Norte es v_y = 90 m/s, por lo tanto, para la magnitud usamos el Teorema de Pitágoras

           \(R= \sqrt{v_x^2 + v_y^2}\)

           R = \(\sqrt{20^2 + 90^2}\)

          R = 92,2 m/s

Para encontrar la direccion usemos trigonometría

          tan θ = \(\frac{v_y}{v_x}\)

          θ = tan⁻¹ \(\frac{v_y}{v_x}\)

          θ = tan⁻¹ 20/90

          θ = 12,5º

La dirección se lee 12,5º al Norte del Este

En conclusión usando la suma de vectores  podemos encontrar la repuesta para la velocidad resultante del avión es:

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If you double the mass of an object while keeping the acceleration constant, you will double the force on the object.

According to Newton's second law of motion, the force acting on an object is directly proportional to the product of its mass and acceleration. Mathematically, this relationship is expressed as F = m * a, where F is the force, m is the mass, and a is the acceleration.When the acceleration is held constant and the mass is doubled, the force on the object will also double. This can be understood by rearranging the equation to F = (m * a) / 2 and observing that the acceleration remains unchanged while the mass is doubled. As a result, the force must also double to maintain the balance of the equation.
Therefore, doubling the mass of an object while keeping the acceleration constant will double the force on the object.

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When you change altitude, or go deep underwater, the change in air pressure may cause tension and discomfort in the eardrum membrane.

The eardrum membrane, also known as the tympanic membrane, is a thin, translucent, and circular layer of tissue. It is situated in the ear canal, and it divides the outer and middle ear. The eardrum vibrates in response to sound waves, causing the auditory ossicles in the middle ear to move.

The eardrum is composed of three layers of tissue. The outer layer is made up of skin cells, the middle layer is made up of fibrous tissue, and the inner layer is made up of mucus-secreting cells. The eardrum is one of the body's most sensitive organs because it is so thin, measuring only 0.1 millimeters thick. Because of its susceptibility to pressure, it can be easily harmed by changes in air pressure caused by loud noises, diving, or flying in an airplane.

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The approximate atmospheric pressure at an altitude of 2000 meters is approximately 869.43 millibars. The atmospheric pressure in millibars at altitude x meters can be approzimated by the following function. the function is valid for values of x between 0 and 10,000. \(f(x)= 1038(1.000134)^-x\) when x between 0 and 10,000.

a. The atmospheric pressure at sea level can be found by putting x=0 in the given functionTo find the atmospheric pressure at sea level (x = 0), we can substitute x = 0 into the given function:

f(x) = \(1038(1.000134)^-x\)

f(0) = \(1038(1.000134)^0\)

f(0) = 1038

Therefore, the atmospheric pressure at sea level is approximately 1038 millibars.

b. To find the approximate atmospheric pressure at an altitude of 2000 meters (x = 2000), we can substitute x = 2000 into the given function:

f(x) =\(1038(1.000134)^-x\)

f(2000) = \(1038(1.000134)^-2000\)

Using a calculator or computer program to evaluate this expression, we find that the approximate atmospheric pressure at an altitude of 2000 meters is approximately 869.43 millibars.

c. As altitude increases, the atmospheric pressure generally decreases. This is because as we move higher in the atmosphere, there is less air above us exerting pressure downward. The decrease in atmospheric pressure with increasing altitude is due to the decreasing density of air molecules as we move away from the Earth's surface.

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Answer:3.5 seconds

Explanation:

Answer:

solids

Explanation:

the particles of solid are closely packed , so it is much more easier to transfer sound wave from one particle to another compared to air and water which the particles are farther away from each other .

Answer:

Answer:

304

Explanation:Answer:

Answer:

Friction of the road on the motorcycle in the opposite direction

Explanation:

khan academy

Hence, 150x would be the greatest achievable particle magnification for this telescope.

It is the product of the focal length of the telescope and the focal length of the eyepiece. The highest usable magnification of a telescope is 50 times its aperture in inches as a general rule (or twice its aperture in millimeters).

The maximum practical magnification of a telescope is determined by several factors,

Using this rule, the maximum practical magnification for a 3-inch telescope with a focal length of 1000 mm would be approximately:

50 x 3 =

150x

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In Zeeman effect Experiment (Transverse configuration), we noticed that the (n) component is more intense (S) than the (a) components. The reason behind this is that the magnetic field is large.What is Zeeman effect?The splitting of spectral lines into several components in the presence of a magnetic field is known as the Zeeman effect. Each component corresponds to a magnetic sublevel transition (delta m = ±1). The spectral lines that were once singularly visible have now been split into several lines.

Each transition is between two energy levels with the same quantum number n, but with different magnetic quantum numbers m.When the magnetic field is perpendicular to the direction of the beam of light, the transverse Zeeman effect is observed. The linearly polarized spectral line that was once visible is now split into three components. The spectral lines are circularly polarized when the magnetic field is parallel to the direction of the beam of light.In Zeeman effect Experiment (Transverse configuration), we observed that the (n) component is more intense (S) than the (a) components. The explanation for this is that the magnetic field is large.

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A 40.0 g bullet strikes a wooden block having mass  7.00 kg . If the bullet becomes embedded in the block and they both move off at a velocity of 5.00 m/s, then the initial velocity of the bullet is 880 m/s.

Momentum is defined as product of mass and velocity of the body. It is denoted by letter p and it is expressed in kg.m/s. Mathematically p = mv. it discuss the moment of the body. body having zero mass or velocity has zero momentum. The dimensions of the momentum is [M¹ L¹ T⁻¹].

according to law of conservation of momentum

m₁v₁ + m₂v₂ = (m₁+m₂)v

initial velocity of the wooden block is zero cause it is at rest.

m₁v₁  = (m₁+m₂)v

Putting all the values in the equation,

0.04v₁  = (0.04+7)×5

0.04v₁  = (0.04+7)×5

v₁  = 880 m/s

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Answer:-750 kg*m/s

Explanation:

Momentum = mass*velocity

Momentum = 15kg*(-50 m/s)

Momentum = -750 kg*m/s

The frequency of the sound waves reaching the person's ear will be greater than the frequency of the waves leaving the car.

Thus, When an object's vibrations pass through a medium and hit the human eardrum, sound is created. According to physics, sound is created as a pressure wave.

When an object vibrates, the air molecules in its immediate vicinity also vibrate, starting a cascade of sound wave oscillations across the medium.

The physics definition acknowledges that sound exists irrespective of an individual's reception, in contrast to the physiological definition, which also takes into account how a subject perceives sound.

Thus, The frequency of the sound waves reaching the person's ear will be greater than the frequency of the waves leaving the car.

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Answer:

&3?.&.)/&282/8//8338/.)9

Explanation:

Physical Science B - Accommodated Finalb. 10jPhysical Science is the branch of natural science that deals with matter, energy, and their interactions. It can be divided into two branches: Chemistry and Physics. Both of these disciplines work together to study the physical world.

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The mass of an atom is less than the sum of the masses of its component protons, neutrons and electrons. The mass defect is 0.0423 amu. The correct option is B.

The mass defect is equal to the mass lost as an equivalent amount of energy during the formation of a given nucleus from the component nucleons.

Δm = M°- M

Δm = Mass defect

M° = Expected total mass

M = Experimentally determined mass

Here 'Li' has 3 protons and 4 neutrons.

The mass of proton = 3 × 1.0073 = 3.0219 amu

The mass of neutron = 4 × 1.0087 = 4.0348 amu

The sum of masses of protons and neutrons = 7.0567

Mass defect = 7.0567 - 7.0144 = 0.0423 amu

Thus the correct option is B.

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Using law of conservation of momentum

\(\\ \sf\Rrightarrow m_1v_1-m_2v_2=(m1+m2)v_3\)

\(\\ \sf\Rrightarrow 1500(5)-3000(7)=(1500+3000)v_3\)

\(\\ \sf\Rrightarrow 7500-21000=4500v_3\)

\(\\ \sf\Rrightarrow -13500=4500v_3\)

\(\\ \sf\Rrightarrow v_3=-3m/s\)

To explain the tangent plane to the surface, `z = 53 − x² − 2y²` at the point `(3, 2, 6)`, let us first determine the partial derivatives of `z` with respect to `x` and `y`.

Partial derivative of `z` with respect to `x`, `∂z/∂x = -2x`Partial derivative of `z` with respect to `y`, `∂z/∂y = -4y`Now, let's find the gradient vector `grad z` at `(3, 2, 6)` and the value of `z` at `(3, 2)`.gradient vector `grad z = (-2x, -4y, 1)`gradient vector `grad z = (-6, -8, 1)` at `(3, 2, 6)`.Value of `z` at `(3, 2)` is given by `z = 53 - 3² - 2(2)² = 39`.

Therefore, the equation of the tangent plane to the surface `

z = 53 − x² − 2y²` at `(3, 2, 6)` is:

`z - 6 = -6(x - 3) - 8(y - 2)`

which can be written as:`6x + 8y + z = 50`Thus, the equation of the tangent plane to the surface `z = 53 − x² − 2y²` at the point `(3, 2, 6)` is `6x + 8y + z = 50`.

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If you add a vector with a magnitude of 1 to a vector of magnitude 2, the possible magnitudes for the vector sum range from 1 to 3.

This is because of the triangle inequality theorem.The triangle inequality theorem states that the magnitude of the sum of two vectors is less than or equal to the sum of their magnitudes. In other words, if we have two vectors A and B, then the magnitude of their sum C is given by:

|C| ≤ |A| + |B|

If we have a vector of magnitude 1, we can call it vector A. If we have a vector of magnitude 2, we can call it vector B.

Then the magnitude of their sum, vector C, is given by:|C| = |A| + |B|.

Since |A| = 1 and |B| = 2, we can substitute those values into the equation: |C| = 1 + 2

|C| = 3

Therefore, the maximum magnitude of the vector sum is 3.

However, the minimum magnitude of the vector sum is found when the vectors are pointing in opposite directions.

In this case, the magnitude of the sum would be:

|C| = |B| - |A|

|C| = 2 - 1

|C| = 1.

Therefore, the possible magnitudes for the vector sum range from 1 to 3.

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The amount of resistance that each resistor has, in this closed circuit, given the batteries is 3 ohms.

In a closed circuit, the total resistance (R_total) is equal to the sum of the individual resistances. We can use Ohm's law to solve for the resistance of each resistor:

Resistance (R) = Voltage (V) / Current (I)

Using Ohm's law, we can solve for the total resistance (R_total) of the circuit:

= V_total / I

= 18V / 2A

= 9 ohms

Since there are three identical resistors in the circuit, we can divide the total resistance by 3 to find the resistance of each resistor:

= 9 / 3

= 3 ohms

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The angle at which the sunlight received at a location on Earth spread out over the largest area is 10°. Last option is correct.

The light coming from the Sun reaching the Earth's surface is called as Sunlight.

When the sun is overhead, the intensity is high because sun's rays are perpendicular to the earth's surface, so the energy spreads over a small area and the heat is too high in that region.

When, the angle is smaller, the sunlight will spread out over a larger area.

Thus, at 10° the sunlight received at a location on Earth spread out over the largest area. Last option is correct.

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Answer:

Expl10

anation:

Her mass is approximately equal to 27 kilograms.

First of all, you need to understand that momentum is a conserved quantity and the solution to this problem involves elastic collision.

Momentum can be defined as p = mv where p is momentum, m is mass, and v is velocity. Just like energy, momentum is a physical quantity that is conserved in an isolated system. Momentum is conserved as a result of Newton's third law, which states that \(F_A=-F_B\).

You are given that the ice skaters bounce off each other, meaning the collision is elastic. Remember that in an elastic collision, m₁u₁ + m₂u₂ = m₁v₁ + m₂v₂ where

Suppose that m₁ = 49 kg, m₂ = x, u₁ and u₂ = 0 m/s, v₁ = 2.1 m/s, and v₂ = 3.81 m/s. Then the mass of the other ice skater is as follows:

49 · 0 + x · 0 = 49 · 2.1 + x · 3.81

0 = 102.9 + 3.81x

3.81x + 102.9 = 0

3.81x = -102.9

x ≈ -27

Since a mass value can't be negative, the absolute value of x is 27. Therefore, it's her actual mass in kilograms.

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Answer:

the magnitude of the car's acceleration is 0.2333 m/s^2.

Explanation:

To find the magnitude of the car's acceleration, we can use the formula:

a = F/m

where a is the acceleration, F is the net force acting on the car, and m is the mass of the car.

In this problem, F = 10.5 N and m = 45 kg. Substituting these values into the formula, we get:

a = 10.5 N / 45 kg

a = 0.2333 m/s^2

Therefore, the magnitude of the car's acceleration is 0.2333 m/s^2.

The thermal energy of the box which is pulled with a force of 250 N to a distance of 10 meters is 2500 J

The force to pull the box = 250 N

The box is moved to a distance of 10 meters

The thermal energy can be found using the formula,

                    W = F x d

where W is the thermal energy

           F is the Force

           d is the distance moved

Let us substitute the known values in the above equation, we get

                      W = 250 x 10

                          = 2500 J

Therefore, the thermal energy of the box is 2500 J

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Chemical bonds store energy that is released when broken, causing physical or chemical change. Sources include movement and fuel.

Chemical bonds store energy in molecules, which can be released when they are broken apart or rearranged. This energy can cause physical or chemical changes in the surroundings.

For example, glow sticks release energy in the form of light when the chemicals inside are mixed together.

Food contains stored energy that is released during digestion, providing fuel for the body's metabolic processes.

Fossil fuels such as gasoline store energy from the sun that was captured by plants millions of years ago.

Movement, such as the motion of wind or water, can also be a source of energy.

Overall, energy stored in chemicals plays a crucial role in many aspects of our daily lives.

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East or west: it remains the same.

North: it increases.

South: it decreases.

At the North pole: it's straight up over your head.

At the equator: it's on the horizon, north of you.

South of the equator: it's below the horizon and you can't see it at all.