Which of the following describes a mixture? (2 points)

a Matter that is composed of a single element and has all the same physical properties
b Matter that is made of molecules of all the same type
c Two atoms chemically bonded together
d A substance made of two or more types of atoms that are not chemically bonded

Answer:

  0.6 seconds

Explanation:

The time to fall from height h is ...

  t = √(2h/g)

  t = √(2(1.86 m)/(9.8 m/s^2)) ≈ √0.3796 s ≈ 0.616 s

It would take about 0.6 seconds for the projectile to hit the ground.

Answer:

0.6 seconds

is ur answer :)

✌❤

Answer:

Explanation:

A) E) When the light hits a square on the CCD charge is produced

B) A) Starting in one corner the charge on each square is moved off the CCD

C) D) The charges on each square are converted into a digital signal

D) B) Light enters the camera

E) C) That signal can be stored or sent to a computer or other device

b. The delay between taking one photograph with a digital camera and taking the next photograph is due to the time it takes to capture the image and process it into a digital signal. This process includes the capturing of the light entering the camera, the conversion of the charges on each square of the CCD into a digital signal, and the storage or sending of the signal to a computer or other device.

Answer: I am assuming it is decreases

Explanation: a straight line is 180 degrees. 2 angles both add up to 180 degrees on a straight line. When one increases, the other has to decrease to keep it 180 degrees on a straight line

Net force = 4 N

Direction is right

Answer: 4N right

Explanation:

The dryness fraction is 0.96. Using steam tables the enthalpies at points 2, 3, and 4 can be calculated as 2936.4 kJ/kg, 2892.3 kJ/kg, and 1039.2 kJ/kg, respectively. The value of q is found to be 1438.3 kJ/kg.

a) 0.2, b) 2687 kJ/kg, c) 0.16 kJ/kg.K, d) 32%, e) 2549.52 kJ/kgPart (a): The steam is superheated at 300°C and 3 MPa, using steam tables it can be seen that the dryness fraction is 0.96.Part (b): This can be calculated using the formula shown below. The net work done by the turbine is given as follows: Net work = m (h1 - h2) + m (h3 - h4) Where m is the mass of the steam entering the turbine and h1, h2, h3, and h4 are the enthalpies at the different points in the cycle.h1 is given as 3478 kJ/kg, and using steam tables the enthalpies at points 2, 3, and 4 can be calculated as 2936.4 kJ/kg, 2892.3 kJ/kg, and 1039.2 kJ/kg, respectively.

Substituting the values in the formula gives the answer as 2687 kJ/kg.Part (c): Heat transfer per unit mass of steam to the boiler can be calculated using the formula shown below:q = h1 - h4 The value of q is found to be 1438.3 kJ/kg. Part (d): The thermal efficiency of the cycle can be calculated using the formula shown below: Efficiency = Net work output/ Heat inputHeat input can be calculated as follows: Heat input = m (h1 - h4) + m (h3 - h2) The value of heat input is calculated to be 4485.4 kJ/kg Substituting the values in the formula gives the answer as 32%.Part (e): The heat transfer to cooling water passing through the condenser is given as follows:q = m (h4 - h5)Where h4 is 1039.2 kJ/kg and h5 is 48.72 kJ/kg. The value of q is calculated to be 2549.52 kJ/kg.

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The vector expression for the induced electric field E is E = (-dΦ/dt) * (1/2πr) * (_r), where Φ is the magnetic flux, r is the distance from the central axis, and _r is the radial unit vector.

To determine the vector expression for the induced electric field, follow these steps:

1. Find the magnetic flux Φ, which is given by the integral of the magnetic field B over the area A: Φ = ∫B⋅dA.

2. Calculate the rate of change of the magnetic flux with respect to time, dΦ/dt.

3. Use Faraday's law of electromagnetic induction, which states that the induced electric field E is equal to the negative rate of change of the magnetic flux: E = -dΦ/dt.

4. Express the electric field E in terms of the distance r from the central axis by using the expression E = (-dΦ/dt) * (1/2πr).

5. Finally, include the radial unit vector _r to express the electric field in vector form: E = (-dΦ/dt) * (1/2πr) * (_r).

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The correct option is c) age. Noting the main sequence turnoff mass in a star cluster provides an estimate of the age of the cluster. The main sequence turnoff point is the point at which stars exhaust the hydrogen in their cores and begin to evolve away from the main sequence.

The mass of the star at the turnoff point is related to the age of the cluster, with higher-mass stars evolving off the main sequence more quickly than lower-mass stars.

Therefore, by determining the mass of stars at the turnoff point, astronomers can estimate the age of the star cluster.

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Complete Question

Planet D has a semi-major axis = 60 AU and an orbital period of 18.164 days. A piece of rocky debris in space has a semi major axis of 45.0 AU.  What is its orbital period?

Answer:

The value  is  \(T_R = 11.8 \ days\)  

Explanation:

From the question we are told that

   The semi - major axis of the rocky debris  \(a_R = 45.0\ AU\)

   The semi - major axis of  Planet D is  \(a_D = 60 \ AU\)

    The orbital  period of planet D is  \(T_D = 18.164 \ days\)

Generally from Kepler third law

          \(T \ \ \alpha \ \ a^{\frac{3}{2} }\)

Here T is the  orbital period  while a is the semi major axis

So  

        \(\frac{T_D}{T_R} = \frac{a^{\frac{3}{2} }}{a_R^{\frac{3}{2} }}\)

=>     \(T_R = T_D * [\frac{a_R}{a_D} ]^{\frac{3}{2} }\)  

=>     \(T_R = 18.164 * [\frac{ 45}{60} ]^{\frac{3}{2} }\)

=>      \(T_R = 11.8 \ days\)  

The orbital period of the rocky debris in space is 12 days.

From Kepler's law, we know that the square of the period of a planet in years is equal to the cube of its mean distance from the sun in astronomical units (AU).

Mathematically;

\(T^2 = r^3\)

Now, we have the mean distance as 45.0 AU, we need to obtain its period.

semi major axis of debris rR= 45.0 AU

semi major axis of planet D rD = 60 AU

Period of planet D  TD  = 18.164 days

Period of debris TR = ?

\(\frac{TR^2}{TD^2} = \frac{rR^3}{rD^3}\)

\(\frac{rR^3}{rD^3} * TD^2\)

\(TR^2 = 45^3/60^3 * 18.164^2\)

TR = 12 days

Missing parts:

Planet D has a semi-major axis = 60 AU and an orbital period of 18.164 days. A piece of rocky debris in space has a semi major axis of 45.0 AU.  What is its orbital period?

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The  magnitude and direction of the force on the charge​ is -12 N opposite the electric field

To calculate the force on a charge in an electric field, we make use of the formula below.

Formula

F = E×Q .......................... Equation 1

Where:

From the question,

Given:

Substitute these values into equation 1

Note: The negative sign indicates that the force is in the direction negative of the electric field.

Hence, The  magnitude and direction of the force on the charge​ is -12 N opposite the electric field

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Answer: A edge 202694020

Explanation:

The eigenvalues of Lz are given by ℏ times the possible values of m. The allowed values of m range from -l to l, inclusive, where l is the orbital angular momentum quantum number.

The eigenvalues of the angular momentum operator are given by the equation L^2 |lm> = l(l+1)|lm>, where L^2 is the square of the angular momentum operator and l(l+1) is the eigenvalue. The eigenvalues of the projection of the angular momentum on the z-axis are given by the equation Lz |lm> = m|lm>, where Lz is the projection of the angular momentum operator on the z-axis and m is the eigenvalue. The eigenvalues of the angular momentum operator and the projection of the angular momentum on the z-axis are related, as the magnitude of the angular momentum L is given by L^2 = Lx^2 + Ly^2 + Lz^2 and the eigenvalues of L^2 and Lz are related to the same quantum numbers l and m.

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The ratio of the inner to outer rotational frequencies is 2.5.

The ratio of the inner to outer rotational frequencies in a compact disk can be calculated using the concept of conservation of angular momentum. When the laser initially scans the disk at a radius of 2.4 cm, the angular velocity of the disk is given by ω1. As the laser moves outwards to a maximum radius of 6.0 cm, the angular velocity of the disk decreases to ω2 due to the conservation of angular momentum.  The ratio of the inner to outer rotational frequencies in a compact disk can be found using the concept of conservation of angular momentum and the constant tangential velocity of the disk.

The tangential velocity of the disk, however, remains constant as the dimensions of the pit information on the disk remain constant with radius. This means that the product of the tangential velocity and the radius of the disk is constant, i.e., v1r1 = v2r2.

Using these equations, we can find the ratio of the inner to outer rotational frequencies as

ω1/ω2 = r2/r1 = 6.0 cm/2.4 cm = 2.5.

This means that the inner part of the disk rotates 2.5 times faster than the outer part of the disk. This is because the outer part of the disk has a larger radius and therefore, a larger circumference to cover in the same amount of time as the inner part of the disk.

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The speed of the hot dog cart going at point B wen jasmine finally wakes up is 21.36 m/s.

Mass of the cart = m = 327 Kg

Speed of the cart while rolling downhill = v = 2.9 m/s

Height of the hill = h = 50 m

Height at point B = h' = 30 m

Speed of the cart when jasmine wakes up = v' =

Using the conservation of energy theorem,

= sum of kinetic and potential energy initially = sum of kinetic energy finally at point B

= mgh + (1/2)mv² = (1/2)mv'²

= gh + (1/2)v² = (1/2)v'²

= 9.81 X (50-30) + (1/2) X 2.9² = (1/2)v'²

= v'² = 21.36 m/s

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a. Specific heat is a property that determines how much energy a substance needs to absorb to increase its temperature by one degree Celsius. Thus, if a metal with a higher specific heat was used, it would require more energy to increase its temperature compared to a metal with a lower specific heat.

When the metal is placed in contact with the water, the energy is transferred from the metal to the water. Therefore, if the metal has a higher specific heat, it will transfer more energy to the water, resulting in a higher final temperature.

For example, copper has a specific heat of 0.385 J/g°C, while aluminum has a specific heat of 0.903 J/g°C. Thus, if aluminum was used instead of copper, it would result in a higher final temperature of the water.

b. The amount of energy required to raise the temperature of a substance depends on its mass, specific heat, and the temperature difference. If the mass of the substance is lower, it requires less energy to increase its temperature compared to a larger mass.

Thus, if 50 g of water was used instead of 100 g, the same amount of energy would increase the temperature of the water more quickly, resulting in a lower final temperature.

For example, if 100 g of water is heated with 100 J of energy, it would increase its temperature by 1°C. However, if 50 g of water is heated with the same amount of energy,

it would increase its temperature by 2°C. Therefore, using 50 g of water would result in a lower final temperature compared to using 100 g of water.

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It takes approximately 5.5 hours for light to travel from the Sun to Pluto

The distance from the Sun to Pluto varies depending on the positions of the two objects in their orbits, as both the Sun and Pluto are constantly moving. However, on average, the distance from the Sun to Pluto is about 5.9 billion kilometers or 3.7 billion miles.

The speed of light is approximately 299,792 kilometers per second or 186,282 miles per second.

Using these values, we can calculate that it takes approximately 5.5 hours for light to travel from the Sun to Pluto

5.9 billion km ÷ 299,792 km/s

=> 19710 seconds

=> 5.5 hours.

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An oldcar with worn-out shock absorbers oscillates with a given frequency when it hits a speed bump. If the driver adds a couple of passengers to the car and hits another speed bump. The car's frequency of oscillation will less then if the driver adds a few passengers to the car and hits another speed bump.

When the car hits the speed bump, its undercarriage moves up and down, creating an oscillation. The car's suspension system, which includes shock absorbers, springs, and tires, absorbs and dampens the energy generated by the oscillations. In this case, since the shock absorbers are worn-out, they are less effective in dampening the oscillations.

As a result, the oscillation frequency of the car is greater. If the driver adds a few passengers to the car, the weight of the car increases. When the car hits the speed bump again, the oscillation frequency decreases due to the greater weight. This is due to the fact that the suspension system absorbs more energy due to the added weight, causing the oscillation to be reduced. As a result, the frequency of oscillation of the car is less than what it was before.

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With the addition of any required constants, the magnitude of the total force acting on the block, fnet, can be expressed in terms of  and m as follows: fnet = Tcosθ - mg = mg/cosθ * cosθ - mg = mg(1 - cosθ)

To find the magnitude of the sum of all forces (fnet) acting on the block, we need to calculate the vector sum of all the forces acting on the block. The forces acting on the block include its weight (mg) and the tension in the string (T), which is at an angle θ with respect to the horizontal. We can resolve the tension force into its horizontal and vertical components as Tcosθ and Tsinθ, respectively.

Since the block is in equilibrium, the net force acting on the block must be zero. Therefore, we can write:

fnet = Tcosθ - mg = 0

Solving for T, we get:

T = mg/cosθ

Substituting the value of T in terms of mg/cosθ into the vertical component of the tension force (Tsinθ), we get:

Tsinθ = mgsinθ/cosθ = mgtanθ

Therefore, the magnitude of the sum of all forces acting on the block, fnet, can be expressed in terms of θ and m, along with any necessary constants, as:

fnet = Tcosθ - mg = mg/cosθ * cosθ - mg = mg(1 - cosθ)

Alternatively, we can also express fnet in terms of the vertical component of the tension force:

fnet = Tsinθ + mg = mgtanθ + mg = mg(tanθ + 1)

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A wedge with an inclination of angle θ rests next to a wall. A block of mass m is sliding down the plane. There is no friction between the wedge and the block or between the wedge and the horizontal surface.

Find the magnitude, Fnet, of the sum of all forces acting on the block.

Express Fnet in terms of θ and m, along with any necessary constants.

Find the magnitude, Fww, of the force that the wall exerts on the wedge.

Express Fww in terms of θ and m, along with any necessary constants.

a) Mutual inductance = 0.108 H; Coupling coefficient = 0.482. b) - 4.95 V.


a) Mutual inductance, M between coil A and coil B can be given as:

M = k√(L_AL_B) here, k is the coupling coefficient, L_A and L_B are the inductances of the coil A and coil B respectively. Since 54% of flux produced by coil A links coil B,

So, K = 0.54

L_A = N_A Φ/I_AL_A

= 8120 × 0.02/6

= 27.07 mH

L_B = N_B Φ/I_BL_B

= 11842 × 0.078/6

= 154.63 mH

M = k√(LALB) = 0.482 × √(27.07 × 0.15463) = 0.108 H

b) The emf induced in coil B can be given as:-

ε = M (dI_B/dt)/L_B

ε = 0.108 × (-6/0.015) / 0.15463 = -4.95 V

Thus, the emf induced in coil B when the current is reversed in 0.015 seconds is -4.95 V.

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Main Answer(final answer)- work done by julie is zero

Supporting answer- The work done by a force is defined as the product of the force's component in the direction of displacement and the magnitude of displacement. Formula. Work can be calculated by multiplying Force by Distance in the force's direction, as shown below. W = F × d.

Body of solution- as Julie walking at constant speed, net work done by her is zero.

Forces acting on suitcase are

1. Gravitational force

2. Force applied by Julie

As gravitational force is perpendicular to displacement, work done by gravity is zero

As work done by Julie and gravity are both zero

final answer -Hence work done by julie is zero

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The weight of the person(s) using the ladder, as well as the weight of any tools or materials being carried up the ladder.

When using a ladder, it is important to calculate the total weight it needs to support to ensure safety and stability. In addition to the weight of the person(s) using the ladder, the weight of any tools or materials being carried up the ladder must also be taken into account.

Neglecting to consider these factors can lead to a ladder being overloaded, which can cause it to become unstable and increase the risk of falls or other accidents.

It is also important to choose the right type of ladder for the job, as different ladders have different weight capacities and maximum load ratings. When in doubt, it is always better to err on the side of caution and choose a ladder with a higher weight capacity than you think you will need.

By taking the time to properly calculate the total weight a ladder needs to support, you can ensure that you are using it safely and reduce the risk of accidents or injuries.

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Answer:

did you ever get the answer

The current in the wire has created a magnetic field with its north pole at the top of the rod. This is because the magnetic field influences electric currents. Thus, the correct option is C.

A magnetic field is a vector field which describes the magnetic influence on a moving electric charge, electric current, and magnetic material. A moving charge in a magnetic field which is experienced a force perpendicular to the own velocity and to the magnetic field.

The magnetic field is also referred to as the field where magnetic forces act to shape an electrical current. The only material or body which is capable of altering an electrical current in a magnetic field is the presence of another magnetic field in the space.

Therefore, the correct option is C.

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Answer:

A farmer with a field of solar panels.

Explanation:

The closest to a locally sources energy would have been

A coal mine located in their county.

But coal as an energy source is not environmentally friendly due to carbon emission, and should not be what the group should advocate for.

The best bet for them is

A farmer with a field of solar panels.

As solar panels are a source of green energy and green energy is what the environmental group should often and always advocate for

Answer:

Approximately \(2.69\; {\rm A}\).

Explanation:

Ensure that all values are measured in standard units. Charge should be measured in coulombs, while time should be measured in seconds:

\(\begin{aligned}t &= 3.0\; {\rm hr} \times \frac{3600\; {\rm s}}{1\; {\rm hr}} = 10800\; {\rm s}\end{aligned}\).

Electric current \(I\) is the rate of flow of electric charge.

In order to find the electric current, divide electric charge \(q\) by the time \(t\) required to transfer these charge. If charge \(q\!\) is measured in coulombs and time \(t\!\) is measured in seconds, the unit of current \(I\)would be amperes:

\(\begin{aligned}I & = \frac{q}{t} \\ &= \frac{29000\; {\rm C}}{10800\; {\rm s}} \approx 2.69\; {\rm A}\end{aligned}\).

The Fourier transform of x(t) can be determined as \(1/(j\omega) - 2e^{-j\omega + e^{-2j\omega}\), where j is the imaginary unit. In the case of the function x(t) = \(e^{-a\timest}u(-t),\) where a > 0, the significance of the condition a > 0 is related to the convergence of the Fourier integral.

To find the Fourier transform of x(t) = u(t) - 2u(t-1) + u(t-2), we start by evaluating the transform of each term individually. The Fourier transform of the unit step function u(t) is given by 1/(jω) + πδ(ω), where j represents the imaginary unit, ω is the angular frequency, and δ(ω) is the Dirac delta function.

Using the linearity property of the Fourier transform, we can find the transform of each term in x(t) separately. The first term, u(t), gives us 1/(jω) + πδ(ω). For the second term, u(t-1), we use the time-shifting property of the Fourier transform, which states that \(e^{-j\omega t}\) transforms to E(ω)\(e^{-j\omega t}\), where E(ω) is the Fourier transform of the function. By applying the time-shifting property, we obtain \(-2e^{-j\omega}e^{-j\omega}\). Similarly, for the third term, u(t-2), we have \(-e^{-2j\omega}e^{-j\omega t}\).

Combining these results, the Fourier transform of x(t) is given by 1/(jω) - \(2e^{-j\omega} + e^{-2j\omega}\), where j is the imaginary unit. This represents the frequency domain representation of the original function x(t).

In the case of the function x(t) = \(e^{-a\times t}u{-t}\), where a > 0, the significance of the condition a > 0 is related to the convergence of the Fourier integral. For the Fourier transform to exist, the function must decay sufficiently fast as t approaches infinity. By imposing the condition a > 0, we ensure that the exponential term decays exponentially as t increases, which guarantees convergence of the integral. Without this condition, the Fourier transform may not exist or may yield a result that is not well-defined.

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Answer:

i put cereal first

Explanation:

cereal

The required order of circular velocities, from smallest to largest is calculated to be d < a < c < b, where, a, b, c, d are the given options.

The velocity equation for the objects moving in circular motion is given by the equation,

v = √(G m/r)

where,

v is the velocity

G is the Gravitational constant

m is the mass of the object

r is the radius of the orbit

a. A 5 kg object halfway to the Moon circling the Earth

In this case, the radius of the orbit is the half of the distance between the Earth and the moon.

r = distance between earth and moon/2 = 384400000 m/2 = 192200000 m

So, v₁ = √(G m/r) = √(6.67408× 10⁻¹¹ × 5/192200000) = 1.317 × 10⁻⁹ m/s

b. A 10-kilogram object is circling the planet just above its surface

The orbit's radius is similar to the size of the planet Earth.

r = r earth = 6371000 m

So, v₂ = √(G m/r) = √(6.67408× 10⁻¹¹ × 10/6371000) = 1.02 × 10⁻⁸ m/s

c. A 15 kg object circling the Earth at a distance equal to that of the Moon

r = distance between the earth and the moon = 384400000 m

So, v₃ = √(G m/r) = √(6.67408× 10⁻¹¹ × 15/384400000) = 1.61 × 10⁻⁹ m/s

d. A 20 kg object that is circling the Earth and is one-quarter to the Moon

r = 1/4(distance between the earth and the moon) = 384400000 m/4 = 96100000 m

So, v₄ = √(G m/r) = √(6.67408× 10⁻¹¹ × 20/96100000) = 1.17 × 10⁻⁹ m/s

Thus, v₄ < v₁ < v₃ < v₂. And the order of options are d < a < c < b.

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a).  frequency = (speed) / (wavelength)

The speed of light is around 3 x 10⁸ m/s.

For 380 nm (violet light), frequency = (3 x 10⁸ m/s) / (380 x 10⁻⁹ m)

Frequency = 7.89 x 10¹⁴ Hz

For 760 nm (red light), frequency = (3 x 10⁸ m/s) / (760 x 10⁻⁹/s)

Frequency = 3.94 x 10¹⁴ Hz

The ratio is 2 .

That's 1 octave, or 0.3 of a decade.

b).  The ratio of highest/lowest sounds is (20,000 Hz/20 Hz) = 1,000

That's 3 decades, or about 10 octaves.

===> Speaking logarithmically ( ! ), ears are sensitive to a range of sound frequencies that's 10 times as wide as the range of light frequencies that eyes can detect.

The rate at which work is completed is indicated by the power word, hence option b is correct. Power, which can be defined as the amount of work done W.

Is the time rate at which the job is completed or energy is given. Energy transferred, expressed as W/t or energy transferred against the time interval t. Work (or energy) per unit time, foot-pounds per minute, joules per second (or watts), and ergs per second are all ways to express power. Work is defined as involving both force applied to the body and displacement of the body. Consider a block that is resting on a horizontal, frictionless floor. A consistent force is acting on this block.

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Answer:  B.) power

Explanation: Get dem hearts up:)

Answer: body composition is the proportion of fat and non fat mass in your body.

Explanation:

Answer:

Body composition is the percentage of a body's weight

Explanation:

Body composition is the body's amount of fat relative to fat-free mass. Individuals with optimal body composition are typically healthier, move more easily and efficiently, and generally feel better.

Answer:

Scientific theories are explanations of some aspect of the natural world based on repeated observations.

Hope this helps!!!!

Answer:

The way that scientists use the word 'theory' is a little different than how it is commonly used in the lay public," said Jaime Tanner, a professor of biology at Marlboro College. "Most people use the word 'theory' to mean an idea or hunch that someone has, but in science the word 'theory' refers to the way that we interpret facts.

Explanation:

answer of the question is into the picture ️