A dentist holds a small mirror 1.9

cm from a patient’s tooth. The image

formed is upright and 5

times as largeas the object. (a) Is

the image real or virtual? (b) What

is the focal length of the mirror? Is it

concave or convex? (c) If the mirror

is moved closer to the tooth, does the

image get larger or smaller? (d) For

what range of object distances does

the mirror produce an upright image?​

Answers

Answer 1

Answer:

follow me for legitimate answer… oh? U don’t like the feeling of people stealing ur points huh?! Well theirs a taste of your own medicine

Explanation:


Related Questions

A 50 mW laser beam is polarized horizontally. It then passes through two polarizers. The axis of the first polarizer is oriented at 30 degrees from the horizontal, and that os the second is oriented at 60 degrees from the horizontal. What is the power of the transmitted beam

Answers

The power of the transmitted beam is 28.1*10^-3.

The wireless strength consortium turned into installed in 2008 to expand interoperable standards across producers. Its Qi inductive power standard published in August 2009 enables high-performance charging and powering of portable gadgets of up to five watts over distances of four cm (1.6 inches).

Electricity transmission is the motion of power from its region of technology to a region wherein it is implemented to perform beneficial paintings. Power is defined officially as units of electricity consistent with units of time.

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Two concentric, coplanar, circular loops of wire of different diameter carry currents in the same direction. Describe the nature of the force exerted on the inner loop by the outer loop and on the outer loop by the inner loop.

Answers

Answer:

Both will be attractive in nature.

Explanation:

In the given case, the direction of the magnetic field is same in both loops as the direction of the current is same in both loops. When two parallel straight wire carrying current in the same direction are brought close to each other, the force between them is attractive in nature. In the same way,  when two coplanar, circular and concentric loops of wire are carrying current in the same direction, the force between them is attractive in nature. It can be checked by using right hand thumb rule.

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why new zealand and sydney celebrate the new year hours before it is celebrated in india.

Answers

Due to geographical location of new zealand and sydney, they celebrate the new year hours before it is celebrated in india.

Why new zealand and sydney celebrate the new year hours before it is celebrated in india?

New Zealand and Sydney celebrate the new year hours before it is celebrated in india because of its geographical position close to the International Date Line. New Zealand is considered one of the first countries in the world that welcome the New Year.

So we can conclude that due to geographical location of new zealand and sydney, they celebrate the new year hours before it is celebrated in india.

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A 60.0-kg skater begins a spin with an angular speed of 6.0 rad/s. By changing the position of her arms, the skater decreases her moment of inertia to one-half its initial value. What is the skater's final angular speed

Answers

The skater's final angular speed is equal to 12 rad/s.

When implemented to angular momentum, the regulation of conservation means that the momentum of a rotating item is no longer exchanged until some form of external torque is carried out. Torque, in this sense, can check with any outside pressure that acts upon the object for the purpose to twist or rotate.

The law of conservation of angular momentum states that once no external torque acts on an item, no trade of angular momentum will occur. The angular momentum of a machine is conserved as long as there may be no net external torque performing on the machine.

In angular kinematics, the conservation of angular momentum refers back to the tendency of a device to keep its rotational momentum inside the absence of outside torque. For a round orbit, the system for angular momentum is (mass) ×(pace) ×(radius of the circle): (angular momentum) = m × v × r.

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A projectile is shot upward from the surface of Earth with an initial velocity of 120 meters per second. What is its velocity after 5 seconds

Answers

After 5 seconds the velocity of the projectile is 71m/s

Given that Initial velocity is 120m/s

Time t = 5s

We need to find the velocity after 5 sec

Projectile motion is the movement of an item hurled or projected into the air, which is only subject to the acceleration of gravity. The trajectory of the object is referred to as its trajectory.

The horizontal velocity of a projectile is constant,

There is a vertical acceleration caused by gravity and  its value is 9.8 m/s

Now the velocity for 5 seconds

[tex]v(t)=v_0-gt\\[/tex]

[tex]v(t)=120-(9.8)(5)\\\\v(t) =71m/s[/tex]

Hence the velocity after 5 seconds is 71m/s

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What is the acceleration of a 600,000 kg freight train, if each of itsthree engines can provide 100,000 n of force?

Answers

The acceleration of a 600,000 kg freight train, if each of its three engines can provide 100,000N of force is 0.167m/s².

How to calculate acceleration?

The acceleration of a freight train can be calculated using the following formula:

Force = mass × acceleration

According to this question, a 600,000kg freight train can produce 100,000N of force. The acceleration is as follows:

100,000 = 600,000 × a

100,000 = 600,000a

a = 0.167m/s²

Therefore, the acceleration of a 600,000 kg freight train, if each of its three engines can provide 100,000N of force is 0.167m/s².

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How does the meaning of the word isometric relate to determining if an isometric transformation occurred?.

Answers

In an isometric transformation, the shape does not change size.

What is isometric transformation?

A shape-preserving transformation (movement) in the plane or in space is called an isometric transformation (or isometry). The isometric transformations include translation, rotation, and combinations thereof, such as the glide, which combines a translation with a reflection.

A stiff transformation called an isometry keeps perimeter and area constant while preserving length and angle measurements.

As a result, while dilations are not isometric since the image and preimage are comparable figures rather than congruent figures, translations, reflections, and rotations are.

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Suppose a 60-kg boy and a 41-kg girl use a massless rope in a tug-of-war on an icy, resistance-free surface. If the acceleration of the girl toward the boy is 3.0 m/s2, find the magnitude of the acceleration of the boy toward the girl.
A.
2.05 m/s2
B.
2 m/s2
C.
2.1 m/s2

Answers

Answer:

Approximately [tex]2.05\; {\rm m\cdot s^{-2}}[/tex].

Explanation:

The net force on the girl would be:

[tex]\begin{aligned}m(\text{girl}) \, a(\text{girl}) &= 41\; {\rm kg} \times 3.0\; {\rm m\cdot s^{-2}} \\ &= 123.0\; {\rm N} \end{aligned}[/tex].

Under the assumptions, the net force on this girl would be equal to the tension force in the rope. All other forces on the girl would be balanced.

In other words, the tension force that the rope exerted on the girl would be [tex]123.0\; {\rm N}[/tex]. The girl would exert a reaction force on the rope at the same magnitude ([tex]123.0\; {\rm N}\![/tex]) in the opposite direction. This force would translate to a [tex]123.0\; {\rm N}\!\![/tex] force on the boy towards the girl.

Under similar assumptions, the net force on the boy would also be [tex]123.0\; {\rm N}[/tex]. Since the mass of the boy is [tex]m(\text{boy}) = 60\; {\rm kg}[/tex], the acceleration of the boy would be:

[tex]\begin{aligned}a(\text{boy}) &= \frac{(\text{net force})}{m(\text{boy})} \\ &= \frac{123.0\; {\rm N}}{60\; {\rm kg}} \\ &= 2.05\; {\rm m\cdot s^{-2}}\end{aligned}[/tex].

The great astronomer of ancient times who summarized and improved a system of circles upon circles to explain the complicated motions of the planets (and published the system in a book now called The Almagest) is:

Answers

The great astronomer of ancient times who summarized and improved...in a book now called The Almagest) is Ptolemy This is further explained below.

Who is Ptolemy?

Generally, Claudius Ptolemy was a Greek mathematician, astronomer, and geographer who lived in the second century CE and is best known for proposing the geocentric model of the cosmos, which was used to explain planetary and stellar movements for the next thousand years.

In conclusion, Ptolemy, the ancient world's preeminent astronomer, compiled and refined a system of circles inside circles to describe the complexities of planetary motion, publishing his work in what is now known as The Almagest.

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why does the production of electricity by friction always yield equal amounts of positive and negative charge

Answers

Friction yields equal amounts of positive and negative charge as positive and negative charges occur in pairs.

What is frictional electricity:

When two charged particles are rubbed together, transfer of charge takes place. This leads to production of electricity, as one object loses electrons and gains positive charge while the other object gains electrons and becomes negatively charged.

All objects contain equal amounts of positive and negative charge. Thus, when friction is caused between them, it yields equal amounts of positive and negative charge which is known as static electricity.

One of the prime example of static electricity is rubbing silk cloth over glass rod. Here, the glass rod loses electrons while silk gains electrons. thus, the glass rod becomes positively charged and silk becomes negatively charged.

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A radio telescope detects an incoming radio wave which has a power of 1.00 x 10-24 W. If this signal creates a potential of 1.00 nV in the radio receiver, how many electrons move through the receiver circuit per second

Answers

Answer:

Therefore, the number of electrons moving through the receiver circuit per second is 6250 electrons/s.

Explanation:

Given:

Power of radio wave, P = 1 × 10⁻²⁴ W

Potential of signal, V = 1 × 10⁻⁹ V

Solution:

Consider the number of electrons flowing through the receiver circuit per second be 'n'.

The current flowing through the circuit will be:

I = P/V

 = (1 × 10⁻²⁴ W)/(1 × 10⁻⁹ V)

 = 1 × 10⁻¹⁵ A

Then, the number of electrons moving through the receiver circuit can be  calculated as:

ne = I

where, e is charge on an electron

            I is current flowing through the circuit

Applying values in above equation we get:

n(1.6×10⁻¹⁹ C) = (1 × 10⁻¹⁵ A)

n = (1 × 10⁻¹⁵ A)/(1.6×10⁻¹⁹ C)

n = 6250 electrons/s

Therefore, the number of electrons moving through the receiver circuit per second is 6250 electrons/s.

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Which part of the heating curve corresponds with the boiling of liquid water?
Ο Α. Α
OB. B
O C. D
OD. C

Answers

Answer:

The answer is B

Explanation:

The section C of the heating curve represents the liquid phase, which is where liquid water is heated. Hence option D is correct.

What is heating?

The body or particle is considered to be heating up as the temperature rises.

100°C is the boiling point of water at 1 atm of pressure.

The term "enthalpy of vaporisation" refers to the amount of heat energy needed to change liquid water into steam.

Enthalpy of vaporisation has a greater value than enthalpy of fusion.

The amount of power needed to melt ice into liquid water is known as the enthalpy of fusion.

As a result, section C illustrates the heating of liquid water.

Hence option D is correct.

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What happens if you move a bar magnet back and forth along the axis of the
coiled wire shown below?

Answers

c. A current is induced in the coiled wire, which lights the light bulb.

What is electromagnetic induction?

If we kept the bar magnet stationary and moved the coil back and forth within the magnetic field an electric current would be induced in the coil.

Then by either moving the wire or changing the magnetic field we can induce a voltage and current within the coil and this process is known as Electromagnetic Induction and is the basic principle of operation of transformers, motors and generators.

When the magnet shown below is moved “towards” the coil, the pointer or needle of the Galvanometer, which is basically a very sensitive center zeroed moving-coil ammeter, will deflect away from its center position in one direction only.

When the magnet stops moving and is held stationary with regards to the coil the needle of the galvanometer returns back to zero as there is no physical movement of the magnetic field.

Therefore ,

If you move a bar magnet back and forth along the axis of the coiled wire shown below then a current is induced in the coiled wire, which lights the light bulb.

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A large truck is ahead of you and is turning right onto a street with two lanes in each direction. The truck:

Answers

May have to swing wide to complete the right turn

In any vehicle which makes any turn, the rear wheels follow a shorter path as compared to the front wheels. While the truck being larger than any usual vehicle, the distance between the wheels are even more, which makes it harder to complete the turn by going in its own lane or the other two right lanes.

So, the truck will try to go wide in left and then complete the right turn as by doing this the distance between the rear and front will get compensated by the width of the lanes making it easier for the truck to complete its turn.

     

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[Your question is incomplete, but most probably your full question was

May not turn without engaging its hazard lights

May complete its turn in either of the two lanes

Must stay in the right lane at all times while turning

May have to swing wide to complete the right turn]

If a jumper has a vertical leap of 1.54 m on his trial run, what is their takeoff speed and hang time (total time to move upwards to the peak and then return to the ground)?​

Answers

The jumper's takeoff speed and hang time are equal to 5.50 m/s and 1.12 seconds respectively.

How to calculate takeoff speed and hang time?

In this scenario, the takeoff speed is the same as the initial velocity of the jumper and it can be calculated by using the third equation of motion. Also, since the motion is against gravity, the acceleration due to gravity will be negative (g = -9.81 m/s²)

V² = U² - 2gS

U² = V² + 2gS

U² = 0² + 2(9.81)(1.54)

U = √30.22

U = 5.50 m/s.

Next, we would calculate the peak time by using the first equation of motion:

V = U - at

0 = 5.5 - 9.81t

9.81t = 5.5

t = 5.5/9.81

t = 0.56 seconds.

Mathematically, the hang time is double the peak time:

Hang time = 2 × 0.56

Hang time = 1.12 seconds.

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Most exceptions to the trend of decreasing radius moving to the right within a period occur in the __________.

Answers

Answer:

Most exceptions to the trend of decreasing radius moving to the right within a period occur in the d-block.

What are the characteristics of d-block elements?

In a period as we advance from left to right, the number of valence electrons in the same shell increases due to which the effective nuclear charge increases and thus the atomic size decreases.In d-block atomic radius initially decreases then remains constant and increases towards the end.As one moves from Sc (scandium) to Zn (zinc), the effective nuclear charge increases by a factor of 1, this is because:The number of electrons are low in the inner shell.The shielding power of d-orbital is low.Inter electronic repulsions will be operating at a value less than the nuclear charge, which will result in decrease in atomic radii.As the number of electrons in the inner orbital increases the outer electrons repel one another which enables them to push away.Although d-orbital has less shielding power, the number of electrons present in it are high. Hence, the electron-electron repulsive force becomes dominant, this results in an increase in the atomic radii.

Therefore, most exceptions to the trend of decreasing radius moving to the right within a period occur in the d-block.

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The ________-year solar cycle is characterized by a variation in the number of sunspots and a reversal of the polarity of the Sun as a whole.

Answers

22 year solar cycle is characterized by a variation in the number of sunspots and a reversal of the polarity of the Sun as a whole.

What are sunspots?

Sunspots are caused by disturbances in the Sun's magnetic field welling up to the Sun's visible surface.

Sunspot are region of the earth that are more darker than other surfaces. They have a reduced temperature.

If sunspots are active, more solar flares will result creating an increase in geomagnetic storm activity for Earth.

Here, the sun's magnetic field changes polarity approximately every 11 years. So, for reversal polarity of the sun, 22 year solar cycle is characterized by a variation in the number of sunspots and a reversal of the polarity of the Sun as a whole.

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When a planet temporarily moves westward in the sky over the course of several weeks or months (instead of eastward, as it typically does), we call it:

Answers

When a planet temporarily moves westward in the sky over the course of several weeks or months (instead of eastward, as it typically does), we call it retrograde motion.

In astronomy, retrograde motion refers to a body's actual or apparent motion in the opposite direction from the majority of solar system objects or other astronomical systems having a favored direction of motion.

Planets usually appear to migrate eastward when compared to the fixed stars.

However, on occasion, they appear to briefly stall in their eastward travel and then migrate westward (backward) in front of the stars for a few months.

They then pause once again. They resume their eastward movement after that.

This motion is known as retrograde motion and sometimes it is just an illusion.

Hence, when a planet temporarily moves westward in the sky over the course of several weeks or months (instead of eastward, as it typically does), we call it retrograde motion.

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A 31.4-kg wheel with radius 1.21 m is rotating at 283 rev/min. It must be brought to a stop in 14.8 s. Find the required average power. Assume the wheel to be a thin hoop.

Answers

The average power required to stop the wheel is 2795 Joule.

To find the answer, we need to know about the linear velocity, acceleration and force on the wheel.

What is the angular frequency of the rotating wheel?Mathematically, angular frequency= 2×π×frequencySo, angular frequency= 2×π× 283 rev/min

= 2×π×(283/60) rev/s

= 30 rad/s

What's the expression of velocity from angular frequency?Mathematically, angular frequency= velocity/radiusSo, velocity= angular frequency × radius Here, radius of the wheel= 1.21m

So, velocity= 30×1.21 m = 36.3 m/s

What will be the acceleration of the wheel, if the final velocity is zero, initial velocity 36.3m/s and time is 14.8 s?Mathematically, acceleration= changeing velocity/timeHere, changing velocity= 36.3m/s and time = 14.8 sSo, acceleration= 36.3/14.8 = 2.45 m/s²What's the force experienced by the wheel?

The force on the wheel= mass× acceleration

= 31.4 × 2.45 = 77 N

What's the average power of the wheel?Mathematically, power= work done / time = force×velocityPower= 77 × 36.3 = 2795 J.

Thus, we can conclude that the average power of the wheel is 2795 J.

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A 1500 kg weather rocket accelerates upward at 10.0 m/s . It explodes 2.00 s after liftoff and breaks into two fragments, one twice as massive as the other. Photos reveal that the lighter fragment traveled straight up and reached a maximum height of 530 m. What were the speed and direction of the heavier fragment just after the explosion

Answers

20 m/s is the speed of the heavier fragment just after the explosion.

Newton's second law of motion states that the resultant force applied to an object is directly proportional to the mass and acceleration of the object.

F = ma                   where, F = Force (Newton)

                                          m= mass

                                          a = acceleration

Given:

mass of rocket = M = 1500 kg

acceleration of rocket = a = 10 m/s²

elapsed time = t = 2.00 s

mass of lighter fragment = m₁ = m = 500 kg

mass of heavier fragment = m₂ = 2m = 1000 kg

maximum height of lighter fragment = h = 530 m

Let's calculate the final speed of the rocket just before the explosion:

v = u + at

v = 0 + 10(2)

v = 20 m/s

Then, we will calculate the height of the rocket just before the explosion:

[tex]h' = ut + \frac{1}{2}at^{2}[/tex]

[tex]h' = 0 + \frac{1}{2} (10)(2.00)^{2}[/tex]

[tex]h' =20m[/tex]

The initial speed of lighter fragment just after the explosion:

[tex]v^{2}[/tex]₁ [tex]= u^{2}[/tex]₁ - [tex]2g[/tex]Δ[tex]h[/tex]

[tex]v^{2}[/tex]₁ [tex]= u^{2}[/tex]₁ - [tex]2g[/tex] [tex](h - h')[/tex]

[tex]0^{2} = u^{2}[/tex]₁[tex]- 2(9.8) (530-20)[/tex]

[tex]u^{2}[/tex]₁[tex]=9996[/tex]

[tex]u[/tex]₁ [tex]=\sqrt{9996} m/s[/tex]

Using Conservation of Momentum Law :

[tex]M v=m[/tex]₁ [tex]u[/tex]₁ [tex]+ m[/tex]₂[tex]u[/tex]₂

[tex]1500 (20)= 500(\sqrt{9996} ) + 1000u[/tex]₂

[tex]u[/tex]₂ ≅ [tex]- 20 m/s[/tex]

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A book placed on a table does not move identify the forces in action and identify why the book foes not move

Answers

Answer:

See below

Explanation:

There is the normal force of the book on the table.....the table exerts the same force ( upwards) on the book.

All of the forces result in a net zero force on the book so it does not move (there are no horizontal forces on the book)

A sky diver, mass 90 kg, reaches a terminal velocity of 60 m/s. What is the approximate magnitude of the force of air resistance?.

Answers

Answer:

The approximate magnitude of the force of air resistance is 540 N.

Explanation:

The audible frequency range for a person is 30HZ to 16500HZ. Determine the largest wavelength of sound in air the person can detect (speed=340m/s)​

Answers

Answer:

We have the formula,

V=λ×v

where,

V is the velocity of sound =330ms

−1

v is the frequency

λ is the wavelength

We have a range of frequencies from 20Hz to 20,000Hz

Hence for frequency v=20Hz, we have

330=20×λ

Therefore, λ=

20

330

m

Explanation:

How can we change direction of light? Name this phenomenon. any indian didis and bhayas to help (ik i said australian any will work for me)goys please help im in grade 6 and my teacher didnt give us the answer to a question in notebook:(

Answers

The phenomenon of change in the direction of light when it passes from one transparent medium to another is called Refraction.

To improve the acoustics in auditorium, a sound reflector with mass of 200 kg is suspended by a chain from the ceiling. what is its weight? what force (magnitude and direction) does the chain exert on it? what is the tension in the chain? assume that the mass of the chain itself is negligible.

Answers

Answer:

 W = 1960 N

T = 1960 N     in the upward direction

Explanation:

Let's apply Newton's second law to this exercise with acceleration equal to zero, translational equilibrium

Weight is

            W = m g

            W = 200 9.8

            W = 1960 N

In the attachment we can see a diagram

             T -W = 0

             T = W

             T = 1960 N

in the upward direction

credit - somebody else

You have a string with a mass of 0.0135 kg. You stretch the string with a force of 8.29 N, giving it a length of 1.83 m. Then you vibrate the string transversely at precisely the frequency that corresponds to its fourth normal mode, that is, at its fourth harmonic. What is the wavelength of the standing wave you create in the string

Answers

The wavelength of the standing wave at fourth harmonic is; λ = 0.985 m and the frequency of the wave at the calculated wavelength is; f = 36.84 Hz

Given Conditions:

mass of string; m = 0.0133 kg

Force on the string; F = 8.89 N

Length of string; L = 1.97 m

1. To find the wavelength at the fourth normal node.

At the fourth harmonic, there will be 2 nodes.

Thus, the wavelength will be;

λ = L/2

λ = 1.97/2

λ = 0.985 m

2. To find the velocity of the wave from the formula;

v = √(F/(m/L)

Plugging in the relevant values gives;

v = √(8.89/(0.0133/1.97)

v = 36.2876 m/s

Now, formula for frequency here is;

f = v/λ

f = 36.2876/0.985

f = 36.84 Hz

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Mature wind waves of one wavelength that form orderly undulations of the ocean surface and often precede a major storm system is known as

Answers

Mature wind waves of one wavelength that form orderly undulations of the ocean surface and often precede a major storm system is known as swells.

Meaning of mature wind and waves:

The waves in a fully developed sea outrun the storm that creates them, lengthening and reducing in height in the process.      

There are 3 types of wind generated waves:

Capillary wavesGravity wavesSwells

we can say that,

Mature wind waves are known as swell, when they left the formation region.

They have traveled away from where they were raised by the wind, and have to a greater or lesser extent dispersed.

Hence,

Mature wind waves of one wavelength is known as swell.

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Which of the following phrases best describes the term scientific model?
OA. A physical copy of a scientific object, system, or process
B. The application of scientific knowledge to make predictions about
an object, system, or process
C. An experiment in which variables are controlled
OD. A simplified representation used to explain or make predictions
about something

Answers

A “a physical and/or mathematical and/or conceptual representation of a system of ideas, events or processes.”

A rectangular box of lines and an extra vertical line near the right end of the box has circles with X's in them on the right side, on the extra line, and on the top side between the extra line and a stack of vertical lines near the left end. The top circle is A. The right side circle is C. The circle on the extra line is B. The bottom side has 2 small circles separated by a short segment of the side near the left end. The top side has a stack of short horizontal lines labeled A in its middle, which are from left to right short, very short, short, very short.
Use the diagram to answer each question with yes or no.

If you removed bulb A, would bulbs B and C continue to shine?

If you removed bulb B, would bulbs A and C continue to shine?

Answers

Light bulbs 1, 2, and 4 will continue to shine when Linh switches off bulb 3.

What exactly is a circuit?

The battery-powered electrical circuit where a voltage differential is generated across a capacitor, a resistor, or an inductor.

As soon as Linh cuts the middle branch, the bulbs in positions 1, 2, and 4 will function as a resistor in a series circuit. Except for resistor number 3, the current through the other resistors will be constant.

In conclusion, if Linh switches off Bulb 3, only Bulbs 1, 2, and 4 will still be on.

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Answer:

1. no

2. yes

Explanation:

on edge 2022

If 710- nm and 660- nm light passes through two slits 0.65 mm apart, how far apart are the second-order fringes for these two wavelengths on a screen 1.5 m away

Answers

0.23 mm far apart are the second-order fringes for these two wavelengths on a screen 1.5 m away.

Given wavelengths 710nm and 660nm,0.65mm apart two slits, and a screen 1.5m away.

Position of n the order fringe = n λ D / d

for n = 2

position = 2 λ D / d

λ = 710 nm , D = 1.5m

d = .65 x 10⁻³

position 1 = 2 x 710 x 10⁻⁹ x 1.5 / .65 x 10⁻³

= 3276.92 x 10⁻⁶ m

= 3.276x 10⁻³ m

= 3.276mm .

For λ = 660 nm

position = 2 λ D / d

λ = 660 nm , D = 1.5 m

d = .65 x 10⁻³

position 2 = 2 x 660 x 10⁻⁹ x 1.5 / .65 x 10⁻³

= 3046.15 x 10⁻⁶ m

= 3.046 x 10⁻³ m

= 3.046 mm .

Difference between their position

= 3.276mm ₋ 3.046 mm

= 0.23 mm .

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