1) 9.26 cm
Explanation:
The focal length of a plane mirror is virtually infinite. Considering the lens equation,
[tex]\frac{1}{f}=\frac{1}{p}+\frac{1}{q}[/tex]
where f is the focal length, p is the object distance, q the image distance. If we replace f with infinity, we get
[tex]q=-p[/tex]
The magnification equation states that
[tex]y' = -\frac{q}{p}y[/tex]
where y is the size of the object and y' the size of the image. Substituting q=-p, we get
[tex]y'=y[/tex]
this means that the image produced by a plane mirror is always:
- Upright (y' is positive)
- The same size as the object
In this case, we have a book of height 9.26 cm (y=9.26 cm). This means that the magnitude of the size of the image (y') will be 9.26 cm as well.
2) 22.7 cm
As we said before, due to the infinite focal length of a plane mirror,
[tex]q=-p[/tex]
this means that the image produced by a plane mirror is always:
- Virtual (because q is negative)
- At the same distance from the mirror as the object
In this case, we have a book placed at 22.7 cm from the mirror (p=22.7 cm). This means that the magnitude of the distance of the image from the mirror (q) will be 22.7 cm as well.
3) 1.60 m/s
We said previously that the image produced by a plane mirror is always at the same distance from the mirror as the real object. This implies that whenever we move the object toward/away from the mirror, the distance p will alway remain equal to the distance q. But this also means that the object and the distance are moving toward/away from the mirror at the same speed.
Therefore, since in this case the person is moving away from the mirror at 1.60 m/s, the image will also move away at a speed of 1.60 m/s.
What electrons are involved in bonding between atoms? (What are they called)
Answer:
The answer is Valence
Explanation:
I hope me putting the answer instead of a paragraph helps yall<3
Valence electrons, which are located in the outermost shell of an atom, participate in the formation of chemical bonds with other atoms.
Explanation:The electrons that are involved in bonding between atoms are known as 'valence electrons'. These electrons are situated in the outermost shell or energy level of an atom. Their role is extremely essential as they partake in the formation of chemical bonds with other atoms. For instance, in the bonding of two hydrogen atoms to form a hydrogen molecule (H2), each atom provides one electron to form a single covalent bond.
Learn more about Electrons in Bonding here:https://brainly.com/question/33889445
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Which are examples of transverse waves? Check all that apply.
The examples of transverse waves are earthquake S waves and Radio waves with visible light and X- rays as the other examples.
Explanation:
The transverse waves are the waves which run perpendicular to direction of the wave. They oscillate at right angle to main wave. They form the crest and troughs which are alternate to each other. All the electromagnetic waves are simply transverse waves as the electric field generated waves are always perpendicular to the magnetic field generated waves.
Which imaging techniques capture real-time images? sonography and fluoroscopy radiography and fluoroscopy sonography and CT MRI and CT
Answer:
A. sonography and fluoroscopy (I just took the edg quiz)
The imaging techniques capture real-time images will be sonography and fluoroscopy.
What is sonography and Fluoroscopy?Sonography is a diagnostic medical procedure that uses high-frequency sound waves (ultrasound) to produce dynamic visual images of organs, tissues or blood flow inside the body. This type of procedure is often referred to as a sonogram or ultrasound exam.
fluoroscopy simply serves as an image-guidance tool, and as such, alternative imaging modalities that do not rely on ionizing radiation can and should be considered. For example, as a real-time, high-resolution imaging modality, ultrasound shares many characteristics with fluoroscopy.
However, due to its lack of reliance on ionizing radiation, ultrasound is often the imaging tool of choice for a number of image-guided interventions for which fluoroscopy may also be considered, particularly in the pediatric population.
Hence the imaging techniques capture real-time images will be sonography and fluoroscopy.
To know more about sonography follow
https://brainly.com/question/26833172
how do you change the strength of a electromagnet
Answer:
The strength of an electromagnet can be increased by increasing the number of loops of wire around the iron core and by increasing the current or voltage. You can make a temporary magnet by stroking a piece of iron or steel (such as a needle) along a permanent magnet.
There are three things that dictate how strong this field is:
1.How much kinetic energy you provide the wire
Answer is changed by pushing more current through the wire.
2. How permeable our magnetic rod is
Answer is changed by picking a more magnetic media
3.How many little magnetic fields you generate to make the net, large magnetic field
Answer is changed by increasing the amount of turns of the wire. More turns, more little fields, strong big field
The strength of an electromagnet can be altered by increasing the electric current, adding more coils or windings to the solenoid, and incorporating a ferromagnetic core.
To change the strength of an electromagnet, there are several factors you can modify:
Increase the electric current flowing through the coil.Add more coils or windings to the solenoid.Use a ferromagnetic core such as iron to enhance the magnetic field.It's worth noting that using more windings increases the winding density, and this, along with a higher current, will increase the magnetic field strength.
Also, keep in mind that the limits to how strong you can make your magnet are the coil resistance and any material-related constraints, like the potential destruction of superconducting properties if the magnetic field is too strong.
A cup of tea at 60°C is sitting on a table in a room whose temperature is 24°C. Choose the best statement concerning heat flow. Heat will flow from the tea into the air in the room. Heat will flow from the air in the room into the tea. There will be no exchange of heat. Heat will flow both ways in equal amounts.
Answer:
Heat will flow from the tea into the air of the room
Explanation:
Heat Transfer
Answer:
Heat will flow from the tea into the air in the room
Explanation:
The sistem is going to find an equilibrium temperature for both elements.
As we have a small hot mass and a large cold mass, that temperature will be colder than the tea (and hotter than the air, but as the size of a cup is too small for a room, it will be almost equal to 24 Celsius)
Then the heat will 'leave' the tea.
why do metals conduct electricity
Answer: Metals conduct electricity well due to the fact that the outermost electrons in their atoms are held by weak atomic forces, allowing these electrons to flow easily from one atom to another.
Explanation:
sound of thunder is heard 5s after the flash of lighting is seen. calculate the distance of nearest point of lighting if the speed of sound in air is 346 ms-1
Answer:
formula
speed = distance / time
distance = speed x time
distance = 346 x 5
distance = 1730 m
The distance of the lightening strike would be 1730 m or 1.7 km
Explanation:
Answer:
1730m
Explanation:
Which of the following would 15 centimeters be equal to
Answer:
150 millimeters
Explanation:
According to linear conversion of units;
1 cm is equivalent to 10 mm
Therefore, 15 cm will be equivalent to 150 mm
On the other hand;
1 Meter is equivalent 100 cm
Therefore; 15 cm will also be equivalent to 0.15 M
Hence;
15 cm = 150 mm = 0.15 m, and so forth
Does he accelerate as he is being pushed?
Answer:
yes, I would believe so.
Explanation:
Acelerating means moving, picking up speed...etc and well he is being pushed so he's moving.
Hope my answer has helped you!
Describe, in as much detail as you can, the life history of a star like our Sun.
Life Cycle of a Star. Stars are formed in clouds of gas and dust, known as nebulae. ... Small stars, like the Sun, will undergo a relatively peaceful and beautiful death that sees them pass through a planetary nebula phase to become a white dwarf, this eventually cools down over time leaving a brown dwarf.
The newest generation of smart phone uses three different batteries connected in a series simultaneously to extend battery life and generate the energy necessary to power the device. If each battery is rated at 2.4 V , what is the overall voltage provided to the phone?
Answer:
7.2 V
Explanation:
The three batteries are connected in series to the terminals of the phone: it means that they are connected along the same branch, so the current flowing through them is the same.
This also means that the potential difference across the phone will be equal to the sum of the voltages provided by each battery.
Here, the voltage provided by each battery is
V = 2.4 V
So, the overall voltage will be
V = 2.4 V + 2.4 V + 2.4 V = 7.2 V
What is a variable?
O
A. A summary of another scientist's work
O
B. An educated guess about the outcome of an experiment
O
C. Something that can change during an experiment
O
D. The analysis of the results of an experiment
C. something that can change during an experiment
It's C: Something that can change in an experiment.
What is the effective resistance between the points A and D? A) 1.3 Ω B) 2.2 Ω C) 10 Ω D) 12 Ω
Answer:
B) 2.2 Ω
Explanation:
First of all, we should notice that the resistor placed between A and B is short-circuited. In fact, the current from point A will follow the wire above between A and C (which has zero resistance), so we can basically ignore the presence of the resistor between A and B, since it has no effect on the circuit.
Then, we can notice that the two resistors between CB and CD are in parallel to each other; therefore, their equivalent resistance is given by:
[tex]\frac{1}{R}=\frac{1}{R_{BC}}+\frac{1}{R_{CD}}=\frac{1}{4.0 \Omega}+\frac{1}{5.0 \Omega}=\frac{9}{20 \Omega}\\R= \frac{20 \Omega}{9}=2.2 \Omega[/tex]
The branch of science concerning heat flow and energy conversions is called
Hello there! the answer is thermodynamics.
Someone in the thermodynamics field often studies how heat works and interacts with different types of energy, making this the best answer choice.
I hope this helps and have a great rest of your day!
Answer:
Thermodynamics
Explanation:
Jeff’s father is installing a do-it-yourself security system at his house. He needs to get a device from his workshop that converts electric energy to sound energy. Which device is Jeff’s father looking for?
A.
switch
B.
motor
C.
buzzer
D.
bulb
E.
battery
Answer:
The correct answer option is C. buzzer.
Explanation:
We know that Jeff's father needs to get a device from his workshop that converts electrical energy to sound energy.
So from the given options, buzzer is the best option Jeff's father can install in his house's security system.
An electric buzzer converts an electrical oscillating voltage into a sound output. In other words, the electrical pulses are converted into sound vibrations.
Answer:
The correct answer option is C. buzzer.
Explanation:
Superman is flying 54.5 m/s when he sees
a train about to fall into a river 850 m
away. He reaches the train in 4.22 s.
What is his final velocity?
348.34 m/s. When Superman reaches the train, his final velocity will be 348.34 m/s.
To solve this problem, we are going to use the kinematics equations for constant aceleration. The key for this problem are the equations [tex]d=v_{0} t+\frac{at^{2} }{2}[/tex] and [tex]v_{f} =v_{0} +at[/tex] where [tex]d[/tex] is distance, [tex]v_{0}[/tex] is the initial velocity, [tex]v_{f}[/tex] is the final velocity, [tex]t[/tex] is time, and [tex]a[/tex] is aceleration.
Superman's initial velocity is [tex]v_{0}=54.5\frac{m}{s}[/tex], and he will have to cover a distance d = 850m in a time t = 4.22s. Since we know [tex]d[/tex], [tex]v_{0}[/tex] and [tex]t[/tex], we have to find the aceleration [tex]a[/tex] in order to find [tex]v_{f}[/tex].
From the equation [tex]d=v_{0} t+\frac{at^{2} }{2}[/tex] we have to clear [tex]a[/tex], getting the equation as follows: [tex]a=\frac{2(d-v_{0}t) }{t^{2} }[/tex].
Substituting the values:
[tex]a=\frac{2(850m-54.5\frac{m}{s}.4.22s) }{(4.22s)^{2}}=69.63\frac{m}{s^{2}}[/tex]
To find [tex]v_{f}[/tex] we use the equation [tex]v_{f} =v_{0} +at[/tex].
Substituting the values:
[tex]v_{f} =54.5\frac{m}{s} +(69.63\frac{m}{s^{2}}.4.22s)=348.34\frac{m}{s}[/tex]
The final velocity is found to be approximately 349.07 m/s.
To determine Superman's final velocity when he reaches the train, we need to use the kinematic equations for uniformly accelerated motion. Given:
Initial velocity (u) = 54.5 m/sTime (t) = 4.22 sDistance traveled (s) = 850 mFirst, we can use the kinematic equation:
s = ut + (1/2)at²where s is the distance, u is the initial velocity, t is time, and a is the acceleration. Plugging in the known values:
850 = 54.5 × 4.22 + 0.5 × a × (4.22)²Simplifying this:
850 = 229.29 + 0.5 × a × 17.8084850 - 229.29 = 8.9042a620.71 = 8.9042aa = 620.71 / 8.9042a ≈ 69.69 m/s²Now, we use another kinematic equation to find the final velocity (v):
v = u + atv = 54.5 + (69.69 × 4.22)v = 54.5 + 294.57v ≈ 349.07 m/sTherefore, Superman's final velocity when he reaches the train is approximately 349.07 m/s.
name the device used for measuring mass
Hello There!
A triple beam balance is used to tell how many grams, ounces and pounds an object is.
What must you know to solve Kepler's third law, the law of periods?
A. Period of the minor axis
B. Period of the orbit
C. Period of the revolution around the sun
D. Period of the major axis
Explanation:
According to the Third Kepler’s Law of Planetary motion “The square of the orbital period of a planet is proportional to the cube of the semi-major axis (size) of its orbit”.
Talking in general, this law states a relation between the orbital period [tex]T[/tex] of a body (moon, planet, satellite) orbiting a greater body in space with the size [tex]a[/tex] of its orbit.
This Law is originally expressed as follows:
[tex]T^{2}=\frac{4\pi^{2}}{GM}a^{3}[/tex]
Where;
[tex]G[/tex] is the Gravitational Constant
[tex]M=1.9(10)^{27}kg[/tex] is the mass of the massive (greater) body
[tex]a[/tex] is the semimajor axis of the orbit of the smaller body
Answer:
D. period of the orbit
a constant force of 10n is applied for 3 seconds to an 8kg object. calculate the change in speed
Answer:
3.75
Explanation:
F= m×a
F=m×(Vf-Vi)/t
10=8×(change in speed)/3
(10×3)÷8=3.75
to keep food warm or cool coolers are made out of materials that are
Answer: insulartors..
what must differ between the atom of two different elements?
1. protons in the atom 2. electrons in the atom 3. neutrons in the atom 4. protons and neutrons in the nucleus
Answer:
1. protons in the atom
Explanation:
Elements in the periodic table are classified according to their number of protons: this means that each element has a different number of protons with respect to another element. There cannot be two elements having the same proton number.
The number of electrons in a neutral atom is equal to the number of protons, however an atom can loose or gain electrons (becoming an ion), therefore two elements can have the same number of electrons if one of them is an ion.
Moreover, an atom of an element can have different isotopes, which means atoms with same proton number but different number of neutrons: therefore, two elements can have the same number of neutrons in the nucleus.
Therefore, the only correct choice is
1. protons in the atom
Answer:
1. protons in the atom
Explanation:
Elements in the periodic table are classified according to their number of protons: this means that each element has a different number of protons with respect to another element. There cannot be two elements having the same proton number.
The number of electrons in a neutral atom is equal to the number of protons, however an atom can loose or gain electrons (becoming an ion), therefore two elements can have the same number of electrons if one of them is an ion.
Moreover, an atom of an element can have different isotopes, which means atoms with same proton number but different number of neutrons: therefore, two elements can have the same number of neutrons in the nucleus.
Therefore, the only correct choice is
1. protons in the atom
An elevator traveled 15 floors (150 ft) at a speed of 4.5 m/s. What additional information is needed to determine the velocity of the elevator?
Answer:
Velocity is vector quantity.So it needs direction in addition to speed.
Explanation:
The velocity of an object is the rate of change of its position with respect to a frame of reference, and is a function of time. Velocity is equivalent to a specification of its speed and direction of motion.
Answer:
It needs to know the direction that the elevator traveled.
Explanation:
3. The diagram to the right shows a Bunsen burner heating a beaker of
water on a beaker stand. The arrows represent the transfer of heat
energy in the water. Which process is primarily responsible for the
transfer of heat indicated by the arrows in the beaker of water?
a. conduction
b. convection
c. radiation
d. condensation
Answer:
I think that the answer is B convection. Heat is transferred by the movement of the water from hotter regions to colder regions.
Answer:
b
Explanation:
The pH of coffee is _______ times greater than the pH of pure water.
Answer:
zero times greater
Explanation:
Coffee's pH level is 5
Pure water's pH level is 7
50+ POINTS and BRAINLIEST
Why does changing the medium affect light? How? And what medium make the wavelength slower and what makes it faster? Please dumb it down or summarize it, I really need help and I'm having trouble understanding this subject.
Explanation:
So this will not exactly be an answer but an explanation.
So you're studying waves I assume? If so great.
For starters we need to figure out where light is fastest; considering what you should know being that if the medium crosses an atom it slows down. This happens when they atom is absorbed. It isn't just one that slows it down it has to be multiple as it takes time to push the emission back out in the same direction.
Higher density = Slower WL
Lower density = Faster WL
Now where light and waves would travel fastest is in a pure vacuum where there is nothing to interrupt the path.
in summary any density slows it down, in a vacuum it can hit it's highest speeds.
If you still need help comment below
A worker stands on a support and with the help of a block will lift the load evenly, the weight of which is 480 H (fig. 216). calculate the pressure produced by the support worker, if his weight is 720 N, and the foot area is 320 cm² (Friction and block weight can be neglected.)
Explanation:
Draw free body diagrams for the worker and the load.
The worker has three forces on him: normal force pushing up, weight pulling down, and tension pulling down.
The load has three forces on it: weight pulling down and two tension forces pulling up.
Sum of the forces on the load:
∑F = ma
2T - 480 N = 0
T = 240 N
Sum of the forces on the worker:
∑F = ma
N - 720 N - 240 N = 0
N = 960 N
So the pressure produced by the worker is:
P = F / A
P = 960 N / 320 cm²
P = 3 N/cm²
P = 30,000 Pa
. A helicopter is 8.50 m above the ground and climbing at 2.5 m/s. It drops a package from rest (relative to the helicopter). At the moment that the package is released, what is its velocity relative to the ground?
Answer:
2.5 m/s
Explanation:
The velocity of the package relative to the ground = the velocity of the package relative to the helicopter + the velocity of the helicopter relative to the ground
v = 0 m/s + 2.5 m/s
v = 2.5 m/s
At the moment it is released, the package is rising at 2.5 m/s.
Final answer:
At the moment of release, the package dropped from the helicopter has an upward initial velocity relative to the ground of 2.5 m/s, equal to the helicopter's climbing velocity.
Explanation:
When a package is dropped from a helicopter that is climbing, the initial velocity of the package relative to the ground is the same as the velocity of the helicopter at that moment. Since the helicopter is climbing at a velocity of 2.5 m/s, the package will also have an initial velocity of 2.5 m/s upward relative to the ground. It is important to note that this is the initial velocity at the moment of release; the package will then be subject to gravitational acceleration which will affect its velocity as it falls.
Collectively living organisms, air, water, and soil constitute the
A. nonpolluted environment.
B. natural environment.
C. population level.
D. stratosphere.
An ecosystem is a combination of living organisms and non-living elements in a given area. The biosphere encompasses all ecosystems on Earth.
An ecosystem consists of all the living things in a particular area together with the abiotic, non-living parts of that environment such as nitrogen in the soil or rainwater. At the highest level of organization, the biosphere is the collection of all ecosystems, representing the zones of life on Earth.
A car changes speed from 25 m/s to 10 m/s in 240 seconds. Describe its acceleration.
Explanation:
Acceleration is change in velocity over change in time:
a = Δv / Δt
a = (10 m/s - 25 m/s) / (240 s - 0 s)
a = -0.0625 m/s²
So the car decelerates at 0.0625 m/s².
ITS TIMED HURRY PLEASE The voltage across the primary winding is 350,000 V, and the voltage across the secondary winding is 17,500 V. If the secondary winding has 600 coils, how many coils are in the primary winding?
A. 30 coils
B. 583 coils
C. 12,000 coils
D. 332,500 coils
12,000 coils. The primary winding has 12,000 coils.
In order to solve this problem we have to use the relation for a transformer Vp/Vs = Np/Ns, where Vp is the voltage across the primary winding, Vs in the voltage across the secondary winding, Np is the numbers of coils in the primary winding, and Ns is the number of coils en the secondary winding.
With Vp = 350,000 V, Vs = 17,500 V, and Ns = 600 coils:
350,000 V/17,500 = Np / 600 coils
Np = (600 coils x 350,000 V) / 17,500 V
Np = 210,000,000/ 17,500 coils
Np = 12,000 coils
Answer:
ITS C
Explanation: